Title of the invention: Wireless power receiving system, moving body, and wheels
Technical field
[0001]
The present invention relates to wireless power receiving systems, mobile bodies, and wheels.
Background technology
[0002]
Conventionally, there is known a wireless power supply technology in which a power transmission device installed on a road surface such as a road or a parking lot wirelessly supplies power to a power reception device installed in a vehicle. For example, Patent Literature 1 discloses a vehicle capable of receiving power from a power transmission device provided on a road surface by providing a power receiving device on the underside of the vehicle.
prior art documents
patent literature
[0003]
Patent Document 1: JP 2018-068077 A
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0004]
However, in the above-described conventional wireless power supply technology, when the distance between the power transmission device provided on the road surface such as a road and the power reception device installed on the vehicle running on the road surface is long, the power transmission device and the power reception device An obstacle such as a small animal or a metal may enter the space between them, and an eddy current may be generated around the obstacle, reducing power reception efficiency. In addition, there is a risk that a small animal or metal that has entered between the power transmission device and the power reception device will be heated and ignite.
[0005]
An object of the present invention, which has been made in view of such circumstances, is to provide a wireless power receiving system, a moving body, and wheels that can improve power receiving efficiency in wireless power feeding.
Means to solve problems
[0006]
The wireless power receiving system according to the present invention is
a power receiving device having a power receiving coil that receives power wirelessly supplied from a power transmitting coil of a power transmitting device installed on a road surface, and at least part of the power receiving coil being housed in a wheel of a mobile body;
and an in-vehicle device installed in the mobile body and electrically connected to the power receiving device,
The power receiving device can transmit the received power to the in-vehicle device,
The receiving coil has a plurality of laminated spiral coil layers.
[0007]
The moving body according to the present invention is
"wheels and
a power receiving device having a power receiving coil that receives power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least part of the power receiving coil being accommodated in the wheel;
and an in-vehicle device electrically connected to the power receiving device,
The power receiving device can transmit the received power to the in-vehicle device,
The receiving coil has a plurality of laminated spiral coil layers.
[0008]
The wheel according to the present invention is
"It is a wheel of a mobile body,
Equipped with a power receiving device having a power receiving coil that receives power wirelessly supplied from the power transmitting coil of the power transmitting device installed on the road surface,
At least part of the receiving coil is housed inside,
The receiving coil has a plurality of laminated spiral coil layers.
Effect of the invention
[0009]
According to the present invention, it is possible to provide a wireless power receiving system, a mobile body, and wheels that can improve power receiving efficiency in wireless power feeding.
Brief description of the drawing
[0010]
1 is a schematic diagram schematically showing a wireless power receiving system according to an embodiment of the present invention using a cross section in the width direction of a wheel; FIG.
[Fig. 2] Fig. 2 is a plan view of an example of a power receiving coil viewed from the axial direction.
3 is a cross-sectional view of the receiving coil taken along line AA of FIG. 2; FIG.
4 is a cross-sectional view of the receiving coil taken along line BB of FIG. 3. FIG.
5 is a cross-sectional view of the receiving coil taken along line CC of FIG. 3. FIG.
6 is a perspective view schematically showing a wire winding structure of the power receiving coil of FIG. 3. FIG.
7 is a schematic diagram schematically showing a tire-wheel assembly as an example of a wheel in the wireless power receiving system according to one embodiment of the present invention, using a cross section in the width direction of the wheel; FIG.
8 is a schematic diagram schematically showing the converter and inverter of the power receiving device housed in the wheel of FIG. 7;
9 is a schematic diagram schematically showing an example of a power receiving coil installed on a wheel; FIG.
10 is a schematic diagram schematically showing another example of a power receiving coil installed on a wheel; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0011]
A wireless power receiving system, a mobile object, and wheels according to one embodiment of the present invention will be described below with reference to the drawings. The same reference numerals are given to common parts and sites in each figure. In this specification, the width direction of the wheel refers to the direction parallel to the axis of rotation of the wheel. The radial direction of the wheel refers to a direction perpendicular to the axis of rotation of the wheel.
[0012]
(Configuration of wireless power receiving system)
FIG. 1 shows a schematic diagram of a wireless power receiving system 1 according to an embodiment of the present invention, using a cross section in the width direction of a wheel. A wireless power receiving system 1 is used for a mobile body 2 having wheels 3 to receive power from a power transmission device 4 installed on a road surface. The wireless power receiving system 1 includes a power receiving device 5 and an in-vehicle device 6 . The power receiving device 5 is at least partly housed in the wheel 3 of the moving body 2 and receives power wirelessly supplied from the power transmitting device 4 installed on the road surface. The in-vehicle device 6 is installed in the mobile body 2 and connected to the power receiving device 5 so as to be electrically conductive. The power receiving device 5 wirelessly receives power from the power transmitting device 4 when the moving object 2 travels or stops on the road surface on which the power transmitting device 4 is installed. The power receiving device 5 transmits the received power to the in-vehicle device 6 .
[0013]
The wireless power receiving system 1 may further include a control device 7 . The control device 7 is communicably connected to the power receiving device 5 and the in-vehicle device 6 via an in-vehicle network such as CAN (Controller Area Network). The control device 7 can control the power receiving device 5 and the in-vehicle device 6 to transmit power wirelessly received by the power receiving device 5 to the in-vehicle device 6 . The positions and numbers of the wheels 3, the power receiving device 5, the vehicle-mounted device 6, and the control device 7 in the mobile body 2 shown in FIG. can.
[0014]
The mobile body 2 can run on a road surface such as a road with the wheels 3 . The mobile object 2 is, for example, an automobile, but is not limited to this. In addition to automobiles such as passenger cars, trucks, buses, and two-wheeled vehicles, moving bodies 2 include agricultural vehicles such as tractors, construction or construction vehicles such as dump trucks, airplanes, bicycles, wheelchairs, and the like. can include any vehicle capable of driving
[0015]
The wheels 3 are used to move the moving body 2. The wheel 3 has a contact surface that comes into contact with a road surface such as a road while being attached to the mobile body 2 . In this embodiment, the wheel 3 is a tire-wheel assembly in which the tire 31 is attached to the wheel 32, but is not limited to this, and may be any wheel that can be attached to the moving body 2 described above. When the wheel 3 is a tire-wheel assembly, the "ground contact surface" of the wheel 3 means the contact surface of the tire 31, i.e., the tire 31 is mounted on the applicable rim, filled with the specified internal pressure, and loaded with the maximum load. It refers to the surface of the tire 31 that is in contact with the road surface.
[0016]
As used herein, the term "applicable rim" refers to industrial standards that are effective in regions where pneumatic tires are produced and used. Standard rims (ETRTO's Measuring Rim in STANDARDS MANUAL, Design Rim in TRA's YEAR BOOK), but for sizes not listed in these industrial standards, it refers to a rim with a width corresponding to the bead width of a pneumatic tire. "Applicable rims" include current sizes as well as sizes that may be included in the aforementioned industrial standards in the future. As an example of "sizes to be described in the future", sizes described as "FUTURE DEVELOPMENTS" in ETRTO 2013 edition can be mentioned.
[0017]
As used herein, the term "specified internal pressure" refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size and ply rating, as described in the aforementioned industrial standards such as the JATMA Year Book. In the case of sizes not listed in the aforementioned industrial standards, the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle on which the tire is mounted is used. In this specification, the "maximum load" refers to a load corresponding to the maximum load capacity of a tire of the applicable size described in the industrial standards described above, or in the case of a size not described in the industrial standards described above. means the load corresponding to the maximum load capacity specified for each vehicle on which the tire is mounted.
[0018]
FIG. 1 shows a schematic diagram of a tire-wheel assembly as an example of a wheel 3 in a wireless power receiving system 1 according to an embodiment of the present invention, using a cross section in the width direction of the wheel 3. ing.
[0019]
As shown in FIG. 1 , the tire 31 has a pair of bead portions 311 , a pair of sidewall portions 312 and a tread portion 313 . The bead portion 311 is configured such that when the tire 31 is mounted on the rim portion 321 of the wheel 32 , the radially inner side and the widthwise outer side are in contact with the rim portion 321 . Sidewall portion 312 extends between tread portion 313 and bead portion 311 . The sidewall portion 312 is positioned radially outward of the bead portion 311 . The tread portion 313 is located radially outward of the sidewall portion 312 and can include the ground contact surface of the tire 31 .
[0020]
The tire 31 is made of rubber such as natural rubber and synthetic rubber, and may include parts made of metal such as steel, such as carcasses, belts and bead wires. For example, at least part of the parts such as the carcass, belts and bead wires may be made of non-magnetic material. As a result, the presence of the metal between the power transmission device 4 and the power reception device 5 allows the tire 31 to maintain the strength of the tire 31, and the electromagnetic induction from the power transmission device 4 to the power reception device 5, as will be described later. Attenuation of the magnetic field generated by the power transmitting device 4 before reaching the power receiving device 5 can be reduced, and the power receiving efficiency of the power receiving device 5 can be improved. However, at least part of the parts such as the carcass, belt and bead wires need not be made of non-magnetic material.
[0021]
Non-magnetic materials can include paramagnetic and diamagnetic materials with low magnetic permeability. As the non-magnetic material, for example, resin materials including thermoplastic resins such as polyester and nylon, thermosetting resins such as vinyl ester resins and unsaturated polyester resins, and other synthetic resins can be used. The resin material can further contain fibers such as glass, carbon, graphite, aramid, polyethylene, and ceramics as reinforcing fibers. Non-magnetic materials are not limited to resins, and any non-metallic materials including rubber, glass, carbon, graphite, aramid, polyethylene, and ceramics can be used. Furthermore, metal materials including paramagnetic materials such as aluminum or diamagnetic materials such as copper can be used as non-magnetic materials.
[0022]
The wheel 32 has a cylindrical rim portion 321 on which the tire 31 is mounted, and a disk portion 322 provided radially inside the rim portion 321 and supported and fixed to the hub 21 of the moving body 2 . there is
[0023]
The wheel 32 can be made of metal such as steel, but is not limited to this. At least part of the rim portion 321 of the wheel 32 may be made of the non-magnetic material described above. As a result, while maintaining the strength of the wheel 32 , the presence of metal such as steel between the power transmission device 4 and the power reception device 5 prevents the magnetic field generated by the power transmission device 4 from reaching the power reception device 5 . Attenuation can be reduced, and the power receiving efficiency of the power receiving device 5 can be improved. However, at least part of the rim portion 321 of the wheel 32 does not have to be made of non-magnetic material.
[0024]
With reference to FIG. 1 , the power transmission device 4 includes a power transmission coil (primary coil) 41 . The power transmission device 4 is installed on road surfaces such as roads and parking lots. Although the power transmission device 4 is embedded in the road or the like in this embodiment, it may be installed so that at least a portion thereof is exposed to the road surface. In the figure, the power transmission coil 41 is shown schematically for the sake of simplification of explanation.
[0025]
The power transmission coil 41 generates an alternating magnetic field based on the alternating current supplied from the power source. In this embodiment, the power transmission coil 41 is configured in an annular shape as a whole. In this specification, the plane surrounded by the annular power transmission coil 41 is also referred to as the coil plane of the power transmission coil 41 . The power transmission coil 41 is arranged so that the coil surface of the power transmission coil 41 is substantially horizontal with the road surface (that is, the axial direction of the power transmission coil 41 is substantially perpendicular to the road surface) so as to generate an alternating magnetic field toward the upper side of the road surface. ) are arranged. The power transmission coil 41 included in the power transmission device 4 is, for example, wound around a core such as a ferrite core, and configured in an annular shape as a whole. Any coil may be used. As a result, when the wheels 3 pass over the power transmission device 4 while the mobile body 2 is running, wireless power supply can be performed from the power transmission coil 41 to the power reception coil 51 by an electromagnetic induction method.
[0026]
The power receiving device 5 includes a power receiving coil (secondary coil) 51 . The power receiving coil 51 receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 . In this embodiment, the power receiving coil 51 is configured in an annular shape as a whole. In this specification, the plane surrounded by the annular power receiving coil 51 is also referred to as the coil plane of the power receiving coil 51 . The power receiving coil 51 is arranged such that the coil surface of the power receiving coil 51 is substantially horizontal with the ground surface of the wheel 3 (that is, the axial direction of the power transmitting coil 41 is substantially perpendicular to the road surface). As a result, based on the AC magnetic field generated by the power transmission coil 41, an electromotive force is generated in the power reception coil 51 by electromagnetic induction, and current flows. In the drawing, the receiving coil 51 is schematically shown for the sake of simplification of explanation.
[0027]
At least part of the power receiving coil 51 is housed in the wheels 3 of the moving body 2 . In the present embodiment, at least part (preferably all) of the coil surface of the power receiving coil 51 faces the ground surface of the wheel 3 . As a result, when the ground surface of the wheel 3 is located above the power transmission coil 41, including the case where the coil surface of the power reception coil 51 does not extend substantially parallel to the ground surface of the wheel 3, the coil of the power reception coil 51 At least part of the surface can face at least part of the coil surface of the power transmission coil 41 with the ground surface of the wheel 3 interposed therebetween. Therefore, the possibility of an obstacle entering between power transmitting coil 41 and power receiving coil 51 can be reduced, and power receiving coil 51 can appropriately receive magnetic lines of force emitted from power transmitting coil 41 . Therefore, power reception efficiency in wireless power feeding can be further improved.
[0028]
Here, in this specification, for example, (at least a part of) the surface A "facing" the surface B means that the area in which the surface B extends in the direction perpendicular to the surface B ( In other words, it means that (at least a part of) the surface A overlaps with the columnar region having the surface B as a cross section.
[0029]
In this embodiment, at least part (preferably all) of the ground contact surface of the wheel 3 faces the coil surface of the power receiving coil 51 . From the viewpoint of further increasing power reception efficiency, at least a part (preferably, all) of the coil surface of the power reception coil 51 faces the ground surface of the wheel 3 and/or the wheel 3 At least a portion (preferably, all) of the ground plane of the power receiving coil 51 is preferably opposed to the coil plane of the power receiving coil 51 .
[0030]
The power receiving coil 51 of the power receiving device 5 is housed in the wheels 3 of the moving body 2 so as not to rotate together with the wheels 3 . For example, the power receiving coil 51 may be installed in a portion of the moving body 2 that is attached to the wheel 3 from the radially inner side of the wheel 3, such as the cover 21a of the hub 21, as shown in FIG. Accordingly, in a state where the wheel 32 of the wheel 3 is attached to the hub 21 of the moving body 2 , at least part of the power receiving coil 51 is accommodated radially inside the wheel 32 .
[0031]
In addition to the power receiving coil 51, the power receiving device 5 may further include a power conversion section, a power storage section, a measurement section, and the like.
[0032]
The power conversion unit includes a converter that converts AC power into DC power, an inverter that converts DC power into AC power, and the like.
[0033]
The power storage unit stores power generated in the power receiving coil 51 . The power storage unit can be, for example, a capacitor. If the power storage unit is a capacitor, it can be charged and discharged in a shorter time than a storage battery or the like, which is advantageous in situations where high responsiveness is required.
[0034]
The measurement unit measures the intensity of power received by the power receiving device 5 . The measurement unit is, for example, a voltmeter or an ammeter, but is not limited to this. The power intensity measured by the measuring unit may include arbitrary numerical information such as power, electric energy, voltage, current, magnetic flux, or magnetic flux density.
[0035]
An example of the power receiving device 5 will be described in more detail below with reference to FIGS. The power receiving device 5 includes a power receiving coil 51 and a coil case 55 . FIG. 2 is a plan view of the receiving coil 51 viewed from a direction perpendicular to the coil surface. FIG. 3 is a cross-sectional view of power receiving coil 51 and coil case 55 of FIG. 2 taken along line AA. 4 is a cross-sectional view of the power receiving coil 51 and the coil case 55 taken along the line BB in FIG. 3, and FIG. 5 is a cross-sectional view of the power receiving coil 51 and the coil case 55 along the line CC in FIG. FIG. 6 is a perspective view schematically showing the winding structure of the wire 53 forming the receiving coil 51. As shown in FIG. 4 and 5, the wire 53 is omitted to facilitate understanding of the shapes of the spiral grooves 55g and 55h. With respect to FIG. 6, the first spiral coil layer 52a is indicated by dashed lines and the second spiral coil layer 52b is indicated by solid lines.
[0036]
The receiving coil 51 can have a multi-layer structure having a plurality of laminated spiral coil layers 52a and 52b. The receiving coil 51 shown in FIGS. 2 to 6 has a two-layer structure having a first spiral coil layer 52a and a second spiral coil layer 52b which are laminated. The power receiving coil 51 is arranged such that the first spiral coil layer 52 a faces the power transmitting coil 41 . In the power receiving coil 51 installed on the moving body 2, the first spiral coil layer 52a is located vertically below the second spiral coil layer 52b. Note that the power receiving coil 51 may have three or more stacked spiral coil layers.
[0037]
As shown in FIG. 2, the first spiral coil layer 52a and the second spiral coil layer 52b are superimposed so that their central axes are aligned on the same straight line.
[0038]
Each of the spiral coil layers 52a and 52b is formed by winding the wire rod 53 spirally on the same plane (in this example, on the same plane). The direction in which the central axes of the spiral coil layers 52 a and 52 b around which the wire 53 is wound extends is defined as the axial direction of the power receiving coil 51 .
[0039]
The wire rod 53 constituting each spiral coil layer 52a, 52b is continuous as a whole. The wire rods 53 forming the first spiral coil layer 52a and the wire rods 53 forming the second spiral coil layer 52b are continuous at the respective inner peripheral edge portions of the spiral coil layers 52a and 52b. That is, the connecting portion 54 between the first spiral coil layer 52a and the second spiral coil layer 52b is located at the inner peripheral edge of the power receiving coil 51 (the inner peripheral edge of each of the spiral coil layers 52a and 52b). The wire 53 forming the first spiral coil layer 52a and the wire 53 forming the second spiral coil layer 52b do not have to be continuous at the inner peripheral edges of the spiral coil layers 52a and 52b. Further, the position of the connecting portion 54 is not limited to the inner peripheral edge of the power receiving coil 51 , and may be provided at the outer peripheral edge of the power receiving coil 51 , for example. The wire rods 53 forming the first spiral coil layer 52a and the wire rods 53 forming the second spiral coil layer 52b may be connected by welding or pressure welding at the connection portion 54, or the connection portion may be connected as described later. The first spiral coil layer 52 a including 54 and the second spiral coil layer 52 b may be wound with one continuous wire 53 .
[0040]
The connecting portion 54 is preferably inclined with respect to the axial direction of the power receiving coil 51, but may be parallel to the axial direction of the power receiving coil 51 (perpendicular to the coil surface of the power receiving coil 51). In this example, the connecting portion 54 is gently inclined in the thickness direction of the power receiving coil 51 . Specifically, the connecting portion 54 intersects the wire 53 forming the first spiral coil layer 52a and the wire 53 forming the second spiral coil layer 52b at an obtuse angle (an angle of more than 90° and less than 180°). It is slanted so that
[0041]
The first spiral coil layer 52a and the second spiral coil layer 52b are configured by winding one continuous wire rod 53. In other words, the first spiral coil layer 52a and the second spiral coil layer 52b including the connecting portion 54 are composed of one continuous wire rod 53. As shown in FIG. Note that "one continuous wire rod 53" means a wire rod that is integrally formed as a whole, and includes, for example, a litz wire made of a plurality of twisted enameled wires. The wire rod 53 is preferably a litz wire, but is not limited to this, and may be, for example, a single wire.
[0042]
As shown in FIG. 6, the wire 53 that constitutes the power receiving coil 51 has a generally rectangular shape as a whole from the winding start end (one end 53a of the wire 53) located on the outer peripheral edge side of the first spiral coil layer 52a. It spirally extends radially inward so as to form a (more specifically, substantially square) coil surface, and is connected to a connecting portion 54 that is inclined with respect to the coil surface at the inner peripheral edge. The portion 54 smoothly continues to the inner peripheral edge of the second spiral coil layer 52b. The wire rod 53 spirally extends radially outward from the inner peripheral edge of the second spiral coil layer 52b in the same manner as the first spiral coil layer 52a, and the winding end portion (wire rod The other end 53b) of 53 is located. One end portion 53a and the other end portion 53b of the wire rod 53 are arranged on the same side surface 55f of a rectangular plate-shaped coil case 55, which will be described later. One end 53a and the other end 53b of the wire rod 53 are located near both ends of the side surface 55f in the longitudinal direction. By adopting such a configuration, the one end portion 53a and the other end portion 53b can be arranged at a position farther apart.
[0043]
The power receiving device 5 includes a coil case 55 that supports the wire 53 . The coil case 55 has a resin-made case body 55a (wire supporting portion) made of an insulating material, a first cover 55b that covers the front surface of the case body 55a, and a second cover 55c that covers the rear surface of the case body 55a. . The first cover 55b and the second cover 55c are made of resin made of an insulating material. The coil case 55 of this example has a third cover 55d provided outside (back side) of the second cover 55c. The third cover 55d may be made of resin or metal such as aluminum.
[0044]
The first spiral coil layer 52a is held between the case body 55a and the first cover 55b, and the second spiral coil layer 52b is held between the case body 55a and the second cover 55c. As a result, the wire 53 forming the receiving coil 51 is housed in the coil case 55 except for the ends 53a and 53b on both sides. As a result, adhesion of dust or the like to the wire 53 can be suppressed.
[0045]
The case main body 55a, the first cover 55b, the second cover 55c, and the third cover 55d that constitute the coil case 55 are fastened with fastening members such as screws or glued.Alternatively, they are fixed to each other by welding or the like.
[0046]
The coil case 55 has a space 55e between the second cover 55c and the third cover 55d in which a plate-shaped magnetic body (ferrite member) or the like can be arranged. By installing a magnetic material in this space 55e, that is, by providing a magnetic material on the back side of the second spiral coil layer 52b, the power receiving efficiency of the power receiving coil 51 can be increased.
[0047]
A magnetic body such as a ferrite core may be provided inside (on the central axis side) of the inner peripheral edge of the receiving coil 51 . In that case, for example, a space for arranging the magnetic body can be provided in the central portion of the case main body 55a.
[0048]
The coil case 55 is formed in a flat plate shape as a whole. In addition, the coil case 55 has a quadrangular shape, more specifically, a substantially square shape in plan view when viewed from the axial direction of the power receiving coil 51 . However, it may have another shape when viewed from the same plane. Similarly, the case main body 55a, the first cover 55b, the second cover 55c, and the third cover 55d, which constitute the coil case 55, are rectangular plates in plan view, and are stacked in the thickness direction of the coil case 55. are placed. It should be noted that the coil case 55 is not limited to being flat as in this example, and may be curved or bent, or may have a concave portion or a convex portion.
[0049]
Spiral grooves 55g and 55h are formed on the front and back surfaces of the case main body 55a, respectively, and the wire 53 is arranged along the spiral grooves 55g and 55h. The wire rod 53 arranged along the spiral groove 55g on the surface of the case body 55a constitutes the first spiral coil layer 52a, and the wire rod 53 arranged along the spiral groove 55h on the back surface of the case body 55a constitutes the second spiral coil layer. It constitutes the spiral coil layer 52b. A partition 55j is provided between the spiral groove 55g on the surface of the case body 55a and the spiral groove 55h on the back.
[0050]
The spiral groove 55g on the surface of the case body 55a and the spiral groove 55h on the back side are separated by a partition 55j in the thickness direction of the case body 55a (the axial direction of the receiving coil 51) by a predetermined distance (at least the thickness of the partition 55j or more). ) apart. The spiral grooves 55g on the front surface and the spiral grooves 55h on the back surface communicate with each other through a through hole 55k formed in the partition wall 55j. The through hole 55k penetrates from the groove bottom of the spiral groove 55g on the front surface (the surface of the partition wall 55j) to the groove bottom of the spiral groove 55h on the back surface (the rear surface of the partition wall 55j).
[0051]
The through-hole 55k is formed at a position corresponding to the connecting portion 54 of the power receiving coil 51 . Therefore, the position of the through-hole 55k can be appropriately changed corresponding to the position of the connecting portion 54 of the power receiving coil 51 . In this example, the through-hole 55k is positioned in the central portion of the case body 55a, and more specifically, at a position corresponding to the inner peripheral edge portion of the power receiving coil 51 . Thereby, the connecting portion 54 of the power receiving coil 51 can be arranged in the through hole 55k.
[0052]
With reference to FIG. 1 again, the in-vehicle device 6 is installed in the mobile object 2 and is electrically connected to the power receiving device 5 . The power receiving device 5 and the in-vehicle device 6 may be electrically connected by a wire. In such a case, the power transmission efficiency from the power receiving device 5 to the in-vehicle device 6 is improved compared to the case of wireless connection. Moreover, the power receiving device 5 and the in-vehicle device 6 may be wirelessly connected so as to be energized. In such a case, for example, wiring of a power transmission line for transmitting power from the power receiving device 5 to the in-vehicle device 6 installed on the main body of the mobile body 2 away from the wheels 3 is not required. reduces the risk of disconnection.
[0053]
The in-vehicle device 6 may include, for example, a driving device 61 that drives the wheels 3 with electric power. In such a case, the driving device 61 consumes the power supplied from the power receiving device 5 to drive the wheels 3 . In this embodiment, the driving device 61 is an in-wheel motor at least partially housed in the wheel 3, but is not limited to this. The driving device 61 may be an onboard motor that is mounted on the main body of the moving body 2 and drives the wheels 3 by driving the shaft 22 of the moving body 2 .
[0054]
Also, for example, the in-vehicle device 6 may include a power storage device 62 that stores power. The power storage device 62 can store power supplied from the power receiving device 5 and supply the power to another in-vehicle device 6 . The power storage device 62 may be any storage battery such as, for example, a lead-acid battery, a nickel-metal hydride battery, a lithium-ion battery, a sodium-sulfur battery, or a combination thereof.
[0055]
The in-vehicle device 6 is not limited to the above examples, and may include any electronic device installed in the mobile body 2, such as a communication device of the mobile body 2, a car navigation system, a media player, and an in-vehicle sensor. good. The in-vehicle device 6 may be installed integrally with the moving body 2, or may be installed detachably.
[0056]
The control device 7 controls at least one of the power receiving device 5 and the vehicle-mounted device 6 . The control device 7 is, for example, a control device (ECU: Electronic Control Unit), but is not limited thereto, and may be any electronic device. The control device 7 may be electrically connected to the power receiving device 5 as one of the vehicle-mounted devices 6 described above.
[0057]
The control device 7 can include, for example, a control section, a storage section, a communication section, an output section, an input section, and the like. For example, based on a predetermined condition, the control device 7 supplies power wirelessly received by the power receiving device 5 to at least one of the plurality of in-vehicle devices 6 including, for example, the driving device 61 and the power storage device 62. can be transmitted to
[0058]
As described above, the wireless power receiving system 1 according to one embodiment of the present invention includes the power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface. a power receiving device 5 in which at least a part of a coil 51 is housed in a wheel 3 of a mobile body 2; and an in-vehicle device 6 installed in the mobile body 2 and electrically connected to the power receiving device 5, The device 5 can transmit the received power to the in-vehicle device 6, and the power receiving coil 51 has a plurality of laminated spiral coil layers 52a and 52b. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wireless power receiving system 1 can improve power receiving efficiency in wireless power feeding.
[0059]
Further, according to the wireless power receiving system 1 according to the embodiment of the present invention, the power receiving coil 51 has a plurality of stacked spiral coil layers 52a and 52b, so that the single-layer power receiving system having the same power receiving performance can be obtained. The area of ​​the coil surface can be made smaller than that of a coil (a receiving coil made up of only one spiral coil layer). That is, the coil surface area of ​​the power receiving coil 51 can be suppressed while ensuring the power receiving performance by ensuring the number of turns of the power receiving coil 51 as a whole by the plurality of spiral coil layers 52a and 52b. For this reason, the flexibility of the installation range of the power receiving coil 51 is improved, and the power receiving coil 51 can be accommodated in a wide range of the wheel 3 . In addition, since the area of ​​the coil surface can be reduced, it becomes easier to install at a position close to the power transmission coil 41 . Therefore, the power receiving efficiency of the power receiving device 5 can be further improved.
[0060]
In the wireless power receiving system 1 according to one embodiment of the present invention, the power receiving coil 51 has a two-layer structure including a first spiral coil layer 52a and a second spiral coil layer 52b. According to such a configuration, the winding structure of the wire is less complicated than when three or more spiral coil layers are provided, and thus the power receiving coil 51 can be manufactured easily.
[0061]
In the wireless power receiving system 1 according to one embodiment of the present invention, the wire 53 forming the first spiral coil layer 52 a and the wire 53 forming the second spiral coil layer 52 b are continuous at the inner peripheral edge of the power receiving coil 51 . ing. According to such a configuration, compared to the case where the first spiral coil layer 52a and the second spiral coil layer 52b are independent, the configuration of the power receiving device 5 can be prevented from becoming complicated, and the power receiving device 5 as a whole can be It can have a simple configuration. In addition, since the connecting portion 54 is provided on the inner peripheral edge portion of the power receiving coil 51, it becomes easier to separate the both end portions 53a and 53b of the wire rod 53 of the power receiving coil 51 from each other. Therefore, the distance between the wire rods 53 can be appropriately secured, so that the loss caused by the proximity effect can be reduced. As a result, the power receiving efficiency of the power receiving device 5 can be further improved.
[0062]
In the wireless power receiving system 1 according to one embodiment of the present invention, the wire rod 53 constituting the first spiral coil layer 52a and the wire rod 53 constituting the second spiral coil layer 52b are composed of one continuous wire rod 53. there is According to such a configuration, power transmission loss can be reduced compared to the case where the power receiving coil 51 is formed by connecting a plurality of wires 53 . Moreover, since it is not necessary to connect a plurality of wires 53, the power receiving coil 51 can be manufactured easily.
[0063]
In the wireless power receiving system 1 according to one embodiment of the present invention, the power receiving coil 51 includes a plate-shaped case body 55a (wire support portion) made of an insulating material, and spiral grooves 55g and 55h formed in the case body 55a. A wire rod 53 is arranged along the . According to such a configuration, the wire rod 53 forming the power receiving coil 51 can be held in a stable state. Moreover, since the distance between the wire rods 53 forming the power receiving coil 51 can be appropriately secured, the loss caused by the proximity effect can be reduced. As a result, the power receiving efficiency of the power receiving device 5 can be further improved.
[0064]
In the wireless power receiving system 1 according to one embodiment of the present invention, the spiral grooves 55g and 55h are formed on the front and back surfaces of the case body 55a, respectively. The spiral groove 55h communicates with the spiral groove 55h through a through hole 55k formed in the case main body 55a. According to this configuration, the plurality of laminated spiral coil layers 52a and 52b can be easily formed by arranging the wire rod 53 along the spiral groove 55g on the surface of the case body 55a and the spiral groove 55h on the back surface. can be done. By passing the wire rod 53 through the through-hole 55k, the first spiral coil layer 52a on the front side of the case body 55a and the second spiral coil layer 52b on the back side can be easily connected.
[0065]
A moving body 2 according to an embodiment of the present invention has wheels 3 and a power receiving coil 51 that receives power wirelessly supplied from a power transmitting coil 41 of a power transmitting device 4 installed on a road surface. A power receiving device 5 at least partly housed in a wheel 3 and an in-vehicle device 6 electrically connected to the power receiving device 5, and the power receiving device 5 can transmit received power to the in-vehicle device 6. , and the receiving coil 51 has a plurality of laminated spiral coil layers 52a and 52b. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the mobile object 2 can improve power reception efficiency in wireless power supply. In addition, since the power receiving coil 51 has a plurality of stacked spiral coil layers 52a and 52b, the coil surface when viewed from the axial direction of the power receiving coil 51 is larger than that of a single-layer structure power receiving coil having similar power receiving performance. area can be reduced. For this reason, the flexibility of the installation range of the power receiving coil 51 is improved, and the power receiving coil 51 can be accommodated in a wide range of the wheel 3 . Moreover, since it becomes easy to install in the position near the power transmission coil 41, the power-receiving efficiency of the power-receiving apparatus 5 can be improved further.
[0066]
The wheel 3 according to one embodiment of the present invention is the wheel 3 of the moving body 2 and includes a power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface.At least part of a power receiving coil 51 is accommodated therein, and the power receiving coil 51 has a plurality of laminated spiral coil layers 52a and 52b. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wheels 3 can improve power reception efficiency in wireless power feeding. In addition, since the power receiving coil 51 has a plurality of stacked spiral coil layers 52a and 52b, the coil surface when viewed from the axial direction of the power receiving coil 51 is larger than that of a single-layer structure power receiving coil having similar power receiving performance. area can be reduced. For this reason, the flexibility of the installation range of the power receiving coil 51 is improved, and the power receiving coil 51 can be accommodated in a wide range of the wheel 3 . Moreover, since it becomes easy to install in the position near the power transmission coil 41, the power-receiving efficiency of the power-receiving apparatus 5 can be improved further.
[0067]
An example of the power receiving device 5 and the driving device 61 will be specifically described below with reference to FIGS. FIG. 7 is a schematic diagram schematically showing a tire-wheel assembly as an example of the wheel 3 in the wireless power receiving system 1 using a cross section of the wheel 3 in the width direction. FIG. 8 is a schematic diagram schematically showing converter 56a and inverter 56b of power receiving device 5 housed in wheel 3 of FIG. In this example, the driving device 61 is an in-wheel motor installed on the wheel 3 and at least part of it is housed in the wheel 3 .
[0068]
As shown in FIGS. 7 and 8, the power receiving device 5 includes a converter 56a and an inverter 56b as power conversion units. Converter 56a is connected to power receiving coil 51 and inverter 56b. The converter 56a can convert the AC power generated in the power receiving coil 51 into DC power and transmit it to the inverter 56b. The inverter 56 b is connected to the converter 56 a and the driving device 61 . The inverter 56 b can convert the DC power from the converter 56 a into AC power and transmit it to the driving device 61 .
[0069]
The converter 56a is positioned vertically above the power receiving coil 51, and the inverter 56b is positioned vertically above the converter 56a. In this example, the entire converter 56a and the entire inverter 56b are housed in the wheel 3. At least a part of the converter 56 a and the inverter 56 b may be housed in the wheel 3 .
[0070]
The converter 56a and the inverter 56b are provided on an annular substrate 56c coaxially arranged with the wheel 3. The receiving coil 51 is positioned below the substrate 56c. Note that the power receiving coil 51 may be positioned so as to overlap the board 56c in the vertical direction.
[0071]
As shown in FIG. 8, the converter 56a and the inverter 56b are arranged at different circumferential positions on the annular substrate 56c. Converter 56a and inverter 56b are arranged concentrically on substrate 56c. The converter 56a is located below the substrate 56c and the inverter 56b is located above the substrate 56c.
[0072]
The drive device 61 is a direct drive motor 63 arranged coaxially with the wheels 3 . The direct drive motor 63 is arranged coaxially with the wheels 3 . Also, the direct drive motor 63 is entirely housed in the wheel 3 . At least part of the direct drive motor 63 may be housed in the wheel 3 .
[0073]
The power receiving device 5 has a coil case 55 that houses a power receiving coil 51 . The coil case 55 is provided integrally with a case 56d that accommodates the converter 56a. Note that the coil case 55 may be connected to the case 56d. Also, the coil case 55 may be installed independently of the case 56d that accommodates the converter 56a. The case 56 d is wholly housed in the wheel 3 . Case 56d surrounds substrate 56c, converter 56a, inverter 56b, and direct drive motor 63 from the outside. Note that the case 56d that accommodates the converter 56a is not an essential component.
[0074]
As described above, the wireless power receiving system 1 having the configuration shown in FIGS. 7 and 8 has the power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface, A power receiving device 5 in which at least a part of a power receiving coil 51 is housed in a wheel 3 of a moving body 2; , the power receiving device 5 includes a converter 56a that converts the AC power generated in the power receiving coil 51 into DC power, and an inverter 56b that can convert the DC power from the converter 56a into AC power and transmit it to the driving device 61, At least part of the converter 56a and at least part of the inverter 56b are accommodated in the wheel 3, the converter 56a is positioned vertically above the power receiving coil 51, and the inverter 56b is vertically above the converter 56a. Located in According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wireless power receiving system 1 can improve power receiving efficiency in wireless power feeding.
[0075]
7 and 8, the converter 56a is positioned above the power receiving coil 51 in the vertical direction, and the inverter 56b is positioned above the converter 56a in the vertical direction. The power receiving coil 51 can be easily arranged close to the power transmitting coil 41, and the power supply from the power transmitting coil 41 to the power receiving coil 51 is less likely to be blocked by the inverter 56b and the converter 56a. Therefore, power reception efficiency can be improved. Moreover, since it is easy to arrange the power receiving coil 51 and the converter 56a close to each other, it is possible to reduce transmission loss when power is transmitted from the power receiving coil 51 to the converter 56a. Moreover, it is easy to shorten the power transmission path from the power receiving coil 51 to the driving device 61 via the converter 56a and the inverter 56b. Therefore, power transmission loss can be reduced, and the space inside the wheel 3 can be effectively used more easily.
[0076]
In the wireless power receiving system 1 having the configuration shown in FIGS. 7 and 8, the converter 56a and the inverter 56b are provided on an annular substrate 56c arranged coaxially with the wheel 3. With such a configuration, the converter 56a and the inverter 56b can be efficiently installed around the shaft portion of the wheel 3, and the space inside the wheel 3 can be effectively utilized.
[0077]
In the wireless power receiving system 1 having the form shown in FIGS. 7 and 8, the driving device 61 is a direct drive motor 63 arranged coaxially with the wheels 3 . According to this configuration, the rotational force of the direct drive motor 63 can be transmitted directly to the wheels 3 without using an indirect mechanism (such as a gearbox), so power loss can be reduced and the wheels can be efficiently driven. 3 can be driven.
[0078]
In the wireless power receiving system 1 having the configuration shown in FIGS. 7 and 8, the power receiving device 5 has a coil case 55 that houses the power receiving coil 51, and the coil case 55 is integrated with the case 56d that houses the converter 56a, or is integrated with the case 56d. 56d. Such a configuration facilitates stabilizing the positional relationship between power receiving coil 51 and converter 56a. Further, by integrating the coil case 55 and the case 56d that accommodates the converter 56a, the size of the power receiving device 5 can be easily reduced.
[0079]
A moving body 2 having the form shown in FIGS. at least a part of which is housed in the wheel 3; and a driving device 61 installed in the wheel 3 and configured to drive the wheel 3 with electric power received by the power receiving device 5; A converter 56a that converts AC power generated in the coil 51 into DC power, and an inverter 56b that converts the DC power from the converter 56a into AC power and can be transmitted to the drive device 61. At least part of the converter 56a and At least part of the inverter 56b is accommodated in the wheel 3, the converter 56a is positioned vertically above the power receiving coil 51, and the inverter 56b is positioned vertically above the converter 56a. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wireless power receiving system 1 can improve power receiving efficiency in wireless power feeding. Further, the converter 56a is positioned vertically above the power receiving coil 51, and the inverter 56b is positioned above the converter 56a in the vertical direction. Power supply from the power transmission coil 41 to the power reception coil 51 is less likely to be blocked by the inverter 56b and the converter 56a. Therefore, power reception efficiency can be improved. Moreover, since it is easy to arrange the power receiving coil 51 and the converter 56a close to each other, it is possible to reduce transmission loss when power is transmitted from the power receiving coil 51 to the converter 56a. Moreover, it is easy to shorten the power transmission path from the power receiving coil 51 to the driving device 61 via the converter 56a and the inverter 56b. Therefore, power transmission loss can be reduced, and the space inside the wheel 3 can be effectively used more easily.
[0080]
The wheel 3 having the form shown in FIGS. 7 and 8 is the wheel 3 of the moving body 2 and has a power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface. The power receiving device 5 includes a power receiving device 5 and a driving device 61 that drives the wheels 3 with the power received by the power receiving device 5. The power receiving device 5 includes a converter 56a that converts AC power generated in the power receiving coil 51 into DC power, An inverter 56b capable of converting the DC power from 56a into AC power and transmitting it to the driving device 61, the wheel 3 accommodates at least part of the converter 56a and at least part of the inverter 56b inside, and the converter 56a is positioned vertically above power receiving coil 51, and inverter 56b is positioned vertically above converter 56a. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wireless power receiving system 1 can improve power receiving efficiency in wireless power feeding. Further, the converter 56a is positioned vertically above the power receiving coil 51, and the inverter 56b is positioned above the converter 56a in the vertical direction. Power supply from the power transmission coil 41 to the power reception coil 51 is less likely to be blocked by the inverter 56b and the converter 56a. Therefore, power reception efficiency can be improved. Moreover, since it is easy to arrange the power receiving coil 51 and the converter 56a close to each other, it is possible to reduce transmission loss when power is transmitted from the power receiving coil 51 to the converter 56a. Moreover, it is easy to shorten the power transmission path from the power receiving coil 51 to the driving device 61 via the converter 56a and the inverter 56b. Therefore, power transmission loss can be reduced, and the space inside the wheel 3 can be effectively used more easily.
[0081]
Another example of the receiving coil 51 will be specifically described below with reference to FIGS. The power receiving coil 51 shown in FIG. 9 has a downward convex shape in a side view seen from the axial direction of the wheel 3 . FIG. 9 schematically shows only the wheels 3 and the receiving coil 51 . For comparison, FIG.For this purpose, the power receiving coil 51a having a flat shape extending horizontally in a side view seen from the axial direction of the wheel 3 is indicated by a chain double-dashed line. In addition, in FIG. 9, for comparison, the power receiving coil 51b, which has a downwardly convex bent shape in a side view, is indicated by a chain double-dashed line. The power receiving coil 51b has the same width and height as the power receiving coil 51 in a side view. Note that the power receiving coil 51 shown in FIG. 9 has a single-layer structure including a single spiral coil layer, but is not limited to this.
[0082]
The power receiving coil 51 shown in FIG. 9 is curved in an arc shape as a whole when viewed from the side. The power receiving coil 51 is not limited to a shape that curves in an arc shape, and may be at least a non-flat shape that is downwardly convex as a whole. good. Although not shown, the power receiving device 5 may have a curved coil case corresponding to the shape of the power receiving coil 51 .
[0083]
In the power receiving coil 51 shown in FIG. 9 , the center of curvature P of the power receiving coil 51 in a side view is located on the central axis of the wheel 3 . Thereby, the receiving coil 51 can be arranged along the inner peripheral surface 3 a of the wheel 3 . In addition, the inner peripheral surface 3a of the wheel 3 can be, for example, the inner peripheral surface of the rim portion 321, but is not limited to this.
[0084]
A power receiving coil 51 shown in FIG. 10 has a plurality of stacked spiral coil layers 52c and 52d. FIG. 10 schematically shows only the wheels 3 and the power receiving coil 51 . In addition, in FIG. 10, for comparison, a power receiving coil 51c having a single-layer structure composed of a single spiral coil layer is indicated by a chain double-dashed line. When the power receiving coil 51 c has a large length in the wheel circumferential direction, the distance from the power transmitting coil 41 tends to be large at both ends of the power receiving coil 51 c in the wheel circumferential direction. For this reason, the receiving coil 51 has a laminated structure having a plurality of spiral coil layers 52c and 52d, and the length in the wheel circumferential direction is reduced. An average distance to the coil 51 can be reduced. In addition, although the power receiving coil 51 shown in FIG. 10 also has the center of curvature P of the power receiving coil 51 in a side view located on the center axis of the wheel 3, it is not limited to this. Moreover, although the power receiving coil 51 of FIG. 10 is configured with two spiral coil layers 52c and 52d, it may have three or more spiral coil layers.
[0085]
The power receiving coil 51 shown in FIG. 10 can have the same configuration as the power receiving coil 51 having the laminated structure described with reference to FIGS. 2 to 6, except that it is curved in side view. For example, the two spiral coil layers 52c and 52d may be configured by winding one continuous wire rod 53. As shown in FIG. Moreover, the power receiving device 5 can include a coil case 55 having a curved shape corresponding to the power receiving coil 51 . In this case, the coil case 55 can include a curved case body 55a (wire supporting portion) corresponding to the shape of the receiving coil 51, a first cover 55b, a second cover 55c, a third cover 55d, and the like. . Alternatively, two spiral coil layers 52c and 52d may be formed by arranging the wire 53 along the spiral grooves provided on the front and back surfaces of the case body 55a.
[0086]
As described above, the wireless power receiving system 1 having the configuration shown in FIGS. 9 and 10 has the power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface, A power receiving device 5 in which at least a part of the power receiving coil 51 is housed in the wheel 3 of the moving body 2, and an in-vehicle device 6 installed in the moving body 2 and electrically connected to the power receiving device 5, The power receiving device 5 can transmit the received power to the in-vehicle device 6 , and the power receiving coil 51 has a downward convex shape when viewed from the side in the axial direction of the wheel 3 . According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wireless power receiving system 1 can improve power receiving efficiency in wireless power feeding.
[0087]
Further, according to the wireless power receiving system 1 having the configuration shown in FIGS. 9 and 10 , the power receiving coil 51 has a downward convex shape when viewed from the side in the axial direction of the wheel 3 , so that the power receiving coil 51 extends horizontally when viewed from the side. The average distance between the power transmitting coil 41 installed on the road surface and the power receiving coil 51 can be reduced compared to the power receiving coil 51a having a flat shape that extends. As a result, the power supply efficiency of the wireless power receiving system 1 having the power receiving coil 51 can be improved.
[0088]
In the wireless power receiving system 1 having the form shown in FIGS. 9 and 10, the power receiving coil 51 is curved in an arc shape when viewed from the side. According to such a configuration, the average distance between the power transmitting coil 41 and the power receiving coil 51 can be further reduced compared to, for example, the power receiving coil 51b having the same width and height in a side view and having a bent V-shape. The power supply efficiency of the wireless power receiving system 1 can be further enhanced.
[0089]
　In the wireless power receiving system 1 having the configuration shown in FIGS. According to such a configuration, the power receiving coil 51 can be arranged along the inner peripheral surface 3 a of the wheel 3 , so that the average distance between the power transmitting coil 41 and the power receiving coil 51 can be further reduced, and the wireless power receiving system 1 power supply efficiency can be further increased. Further, by arranging the power receiving coil 51 along the inner peripheral surface 3a of the wheel 3, the space inside the wheel 3 can be effectively utilized.
[0090]
In the wireless power receiving system 1 having the form shown in FIG. 10, the power receiving coil 51 has a plurality of stacked spiral coil layers 52c and 52d. According to such a configuration, the length of the power receiving coil 51 in the side view in the circumferential direction of the wheel 3 can be made smaller than that of the power receiving coil 51c having a single-layer structure consisting of a single spiral coil layer. Therefore, the average distance between the power transmitting coil 41 and the power receiving coil 51 installed on the road surface can be further reduced, and the power feeding efficiency can be further increased.
[0091]
9 and 10 has wheels 3 and a power receiving coil 51 for receiving power wirelessly supplied from a power transmitting coil 41 of a power transmitting device 4 installed on a road surface. at least a part of which is housed in the wheel 3; and an in-vehicle device 6 electrically connected to the power receiving device 5; It is possible, and the receiving coil 51 has a downward convex shape in a side view seen from the axial direction of the wheel 3 . According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the mobile object 2 can improve power reception efficiency in wireless power supply. In addition, since the power receiving coil 51 has a downwardly convex shape when viewed from the side in the axial direction of the wheel 3, it is easier to install on the road surface than the power receiving coil 51a, which has a flat shape extending horizontally when viewed from the side. Therefore, the average distance between the power transmitting coil 41 and the power receiving coil 51 can be reduced. As a result, the power supply efficiency of the wireless power receiving system 1 having the power receiving coil 51 can be improved.
[0092]
The wheel 3 having the configuration shown in FIGS. 9 and 10 is the wheel 3 of the moving body 2 and has a power receiving coil 51 that receives power wirelessly supplied from the power transmitting coil 41 of the power transmitting device 4 installed on the road surface. The power receiving device 5 is provided, and at least a portion of the power receiving coil 51 is housed therein. According to such a configuration, at least part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that an obstacle does not exist in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. It is possible to reduce the possibility of entry. Therefore, the wheels 3 can improve power reception efficiency in wireless power feeding. In addition, since the power receiving coil 51 has a downwardly convex shape when viewed from the side in the axial direction of the wheel 3, it is easier to install on the road surface than the power receiving coil 51a, which has a flat shape extending horizontally when viewed from the side. Therefore, the average distance between the power transmitting coil 41 and the power receiving coil 51 can be reduced. As a result, the power supply efficiency of the wireless power receiving system 1 having the power receiving coil 51 can be improved.
[0093]
Although the present invention has been described based on the drawings and embodiments, it should be noted that a person skilled in the art can make various modifications and modifications based on the present invention. Therefore, it should be noted that these variations and modifications are included within the scope of the present invention. For example, configurations or functions included in each embodiment or each example can be rearranged so as not to be logically inconsistent. In addition, the configurations or functions included in each embodiment can be used in combination with other embodiments or other examples, and multiple configurations or functions can be combined into one, divided, or combined into one. It is possible to omit the part.
[0094]
For example, all or part of the functions or processes described as the functions or processes of the control device 7 in the above-described embodiment may be implemented as the functions or processes of the power receiving device 5 or the vehicle-mounted device 6 . For example, a program describing processing details for realizing each function of the control device 7 according to the embodiment is stored in a memory or the like provided in the power receiving device 5 or the vehicle-mounted device 6, and the processor or the like of the power receiving device 5 or the vehicle-mounted device 6 executes the program. A program may be read and executed.
[0095]
Also, for example, in the above-described embodiment, the coil surface of the power receiving coil 51 is arranged so as to be substantially parallel to the ground surface of the wheel 3, but this is not the only option. The coil surface of the power receiving coil 51 may be arranged at any angle from 0 to 90 degrees with respect to the ground surface of the wheel 3 . The angle between the coil plane of the power receiving coil 51 and the ground plane of the wheel 3 may be arbitrarily determined according to the application of the power receiving device 5, the amount of power to be received, and the like.
[0096]
Also, for example, in the embodiment described above, the tire 31 was described as being filled with air, but this is not the only option. For example, the tire 31 can be filled with a gas such as nitrogen. Further, for example, the tire 31 can be filled with any fluid, including liquid, gel-like substance, powder, or the like, instead of or in addition to gas.
Code explanation
[0097]
1: wireless power receiving system, 2: moving body, 21: hub, 22: shaft, 3: wheel, 31: tire, 311: bead portion, 312: sidewall portion, 313: tread portion, 32: wheel, 321: rim Section 322: Disk Section 4: Power Transmission Device 41: Power Transmission Coil 5: Power Reception Device 51: Power Reception Coil 52a: First Spiral Coil Layer 52b: Second Spiral Coil Layer 56a: Converter 56b: Inverter 6: in-vehicle device, 61: drive device, 62: power storage device, 7: control device, 71: control unit, 72: storage unit, 73: communication unit, 74: output unit, 75: input unit
The scope of the claims
[Claim 1]
a power receiving device having a power receiving coil that receives power wirelessly supplied from a power transmitting coil of a power transmitting device installed on a road surface, and at least part of the power receiving coil being housed in a wheel of a mobile body;
and an in-vehicle device installed in the mobile body and electrically connected to the power receiving device,
The power receiving device can transmit the received power to the in-vehicle device,
A wireless power receiving system in which the power receiving coil has a plurality of stacked spiral coil layers.
[Claim 2]
The wireless power receiving system according to claim 1, wherein the power receiving coil has a two-layer structure including a first spiral coil layer and a second spiral coil layer that constitute the plurality of spiral coil layers.
[Claim 3]
The wireless power receiving system according to claim 2, wherein the wire constituting the first spiral coil layer and the wire constituting the second spiral coil layer are continuous at the inner peripheral edge of the power receiving coil.
[Claim 4]
The wireless power receiving system according to claim 2 or 3, wherein the first spiral coil layer and the second spiral coil layer are configured by winding one continuous wire.
[Claim 5]
The power receiving device has a plate-shaped wire support,
The wireless power receiving system according to any one of claims 1 to 4, wherein a wire constituting said power receiving coil is arranged along a spiral groove formed in said wire support.
[Claim 6]
The spiral grooves are formed on the front and back surfaces of the wire support part, respectively,
6. The wireless power receiving system according to claim 5, wherein said spiral groove formed on said front surface and said spiral groove formed on said back surface are in communication with each other through a through hole formed in said wire supporting portion. .
[Claim 7]
"wheels and
a power receiving device having a power receiving coil that receives power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least part of the power receiving coil being accommodated in the wheel;
and an in-vehicle device electrically connected to the power receiving device,
The power receiving device can transmit the received power to the in-vehicle device,
A moving body in which the receiving coil has a plurality of stacked spiral coil layers.
[Claim 8]
"It is a wheel of a mobile body,
Equipped with a power receiving device having a power receiving coil that receives power wirelessly supplied from the power transmitting coil of the power transmitting device installed on the road surface,
At least part of the receiving coil is housed inside,
A wheel in which the receiving coil has a plurality of laminated spiral coil layers.