Title of Invention: Magnetic Pole Piece Device, Magnetic Gear, Magnetic Geared Motor and Magnetic Geared Generator
Technical field
[0001]
The present disclosure relates to a magnetic pole piece device and a magnetic gear including the magnetic pole piece device.
This application claims priority based on Japanese Patent Application No. 2020-009603 filed on January 24, 2020, the content of which is incorporated herein.
Background technology
[0002]
As a type of gear device, a magnetic gear that uses the attractive and repulsive forces of magnets to transmit torque and motion without contact, thereby avoiding problems such as wear, vibration, and noise caused by tooth contact. There is Among these magnetic gears, the magnetic flux modulation type (harmonic type) magnetic gear has an inner peripheral magnetic field and an outer peripheral magnetic field arranged concentrically (coaxially), and between these two magnetic magnetic fields. A magnetic pole piece device having a plurality of magnetic pole pieces (pole pieces) and a plurality of non-magnetic bodies arranged alternately in the circumferential direction (Patent Document 1 to 2). Then, the magnetic fluxes of the magnets of the two magnetic fields are modulated by the magnetic pole pieces to generate harmonic magnetic fluxes, and the two magnetic fields are synchronized with the harmonic magnetic fluxes. , the flux-modulated magnetic gear operates.
[0003]
For example, in a magnetic geared motor in which the magnetic flux modulation type magnetic gear and the motor are integrated, the magnetic field on the outer peripheral side is fixed and functions as a stator, and the magnetic field on the inner peripheral side is fixed to the high-speed rotor, The pole piece arrangement described above functions as a low speed rotor. By rotating the high-speed rotor by the magnetomotive force of the coil, the low-speed rotor rotates according to the reduction ratio determined by the ratio between the number of pole pairs of the high-speed rotor and the number of pole pairs of the low-speed rotor. As a magnetic geared motor, a type in which permanent magnets are installed in a high-speed rotor and a stator, and a type in which a permanent magnet is installed only in a high-speed rotor are known.
prior art documents
patent literature
[0004]
Patent Document 1: US Patent No. 9425655
Patent Document 2: Japanese Patent No. 5286373
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0005]
Since the magnetic pole piece device described above receives magnetic forces generated by magnets such as permanent magnets possessed by the two magnet fields adjacent to each other on the inner peripheral side and the outer peripheral side, the magnetic pole piece device is deformed in the radial direction unless the rigidity is above a certain level. may interfere with the magnets of the above-mentioned magnetic fields that are radially adjacent to each other. Therefore, in order to prevent deformation in the radial direction due to the above magnetic force, it is considered to increase the rigidity by installing a cylindrical cover member with a high elastic modulus on the outer peripheral side and the inner peripheral side of the plurality of magnetic pole pieces. be done.
[0006]
Here, in the above-mentioned magnetic pole piece, heat is generated due to iron loss. The temperature specs are tighter than the pole pieces. For this reason, the air gaps formed between the magnetic pole piece device (plurality of magnetic pole pieces) and the two adjacent (facing) magnetic fields on the inner and outer diameter sides thereof have an axial direction of It is necessary to positively remove heat by supplying a cooling medium (for example, air) so as to flow along. However, if both radial surfaces of the plurality of magnetic pole pieces are covered with the above-described cover member, the cooling medium supplied to the air gap flows along the cover member from one end side of the air gap toward the other end side. However, the longer the air gap in the axial direction, the higher the temperature of the cooling medium as it flows, and the lower the cooling performance on the downstream side.
[0007]
In view of the above circumstances, it is an object of at least one embodiment of the present invention to provide a magnetic gear pole piece device with improved rigidity and cooling performance.
Means to solve problems
[0008]
A pole piece device according to at least one embodiment of the present invention,
A magnetic pole piece device disposed between an inner diameter side magnet field and an outer diameter side magnet field in a magnetic gear,
an outer peripheral cover member having a cylindrical shape and arranged to face the outer diameter side magnet field;
an inner circumference cover member having a cylindrical shape and arranged facing the inner diameter side magnet field;
a plurality of magnetic pole pieces arranged at intervals in the circumferential direction between the outer peripheral cover member and the inner peripheral cover member,
The outer peripheral cover member includes a plurality of outer peripheral side facing portions facing the outer peripheral surfaces of the plurality of magnetic pole pieces, and a plurality of outer peripheral side connecting portions connecting two adjacent outer peripheral side facing portions,
The inner peripheral cover member includes: a plurality of inner peripheral side facing portions facing the inner peripheral surfaces of the plurality of magnetic pole pieces; a plurality of inner peripheral side connecting portions connecting two adjacent inner peripheral side facing portions; including
Each of the plurality of outer peripheral side connection portions has an outer peripheral side communication portion that communicates the inner peripheral side and the outer peripheral side of the outer peripheral cover member,
Each of the plurality of inner peripheral side connection portions has an inner peripheral side communication portion that communicates the inner peripheral side and the outer peripheral side of the inner peripheral cover member.
[0009]
The magnetic gear according to at least one embodiment of the present invention is
　The inner diameter side magnet field,
an outer diameter magnet field arranged on the outer diameter side with respect to the inner diameter magnet field;
and the above-described magnetic pole piece device disposed between the inner diameter side magnet field and the outer diameter side magnet field.
Effect of the invention
[0010]
According to at least one embodiment of the present invention, a magnetic gear pole piece device with improved rigidity and cooling performance is provided.
Brief description of the drawing
[0011]
1 is a schematic diagram of a cross section along the radial direction of a magnetic gear according to an embodiment of the present invention;
2 is a partially enlarged cross-sectional view of the magnetic gear shown in FIG. 1; FIG.
3 is a schematic diagram of a cross section along the axial direction of the magnetic gear according to one embodiment of the present invention; FIG.
4 is a perspective view schematically showing part of a pole piece device according to an embodiment of the present invention; FIG.
5 is a perspective view schematically showing part of a pole piece device according to an embodiment of the present invention; FIG.
6 is a perspective view schematically showing part of a pole piece device according to an embodiment of the present invention; FIG.
7 is a perspective view schematically showing part of a pole piece device according to an embodiment of the present invention; FIG.
8 is a schematic diagram of a cross-section along the radial direction of the pole piece device according to one embodiment of the present invention. FIG.
9 is a diagram for explaining the flow direction of a cooling medium inside the magnetic gear according to one embodiment of the present invention; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0012]
Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions that exclude the existence of other components.
[0013]
(Configuration of magnetic gear 9)
FIG. 1 is a schematic diagram of a cross section along the radial direction c of the magnetic gear 9 according to one embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view of the magnetic gear 9 shown in FIG. FIG. 3 is a schematic diagram of a cross section along the axial direction b of the magnetic gear 9 according to one embodiment of the present invention. In the following description, the direction along the rotational direction of the magnetic gear 9 (magnetic pole piece device 1) is the circumferential direction a, the direction along the rotational axis of the magnetic gear 9 (magnetic pole piece device 1) is the axial direction b, and the above circumferential direction A direction (radial direction) orthogonal to the direction a and the axial direction b will be described as a radial direction c.
[0014]
The magnetic gear 9 is a device that has a mechanism that uses the attractive force and repulsive force of a magnet to transmit torque without contact. The magnetic gear 9 shown in FIGS. 1 to 3 is of a magnetic flux modulation type (harmonic type), and as shown, the outer diameter side magnet field 5 having a cylindrical (annular shape, the same applies hereinafter) shape as a whole. (outer rotor), an inner diameter magnet field 7 (inner rotor) having an overall cylindrical or columnar shape, and a magnetic pole piece device 1 (center rotor) having an overall cylindrical shape. there is Then, the pole piece device 1 is disposed between the outer magnet field 5 and the inner magnet field 7 on the same axis l (coaxial) and at a constant distance in the radial direction c. are arranged with an interval (air gap G) of . That is, the outer magnet field 5 is arranged radially outward (outer diameter side) with respect to the inner magnet field 7 . Also, the pole piece device 1 is arranged between the inner diameter magnet field 7 and the outer diameter magnet field 5 . The outer magnet field 5, the inner magnet field 7 and the pole piece device 1 are arranged concentrically.
[0015]
In addition, as shown in FIG. 2, the outer diameter side magnet field 5 and the inner diameter side magnet field 7 are circumferential It has a magnetic pole pair (51, 71), such as a permanent magnet, consisting of a plurality of north and south poles spaced (equally spaced) thereon. Specifically, the outer diameter magnet field 5 has a plurality of magnetic pole pairs 51 and a support member 52 that supports the plurality of magnetic pole pairs 51 . On the cylindrical inner peripheral surface of the outer magnet field 5, a plurality of magnetic pole pairs 51 are arranged so that the magnetic poles face the radial direction c, and the N poles and S poles are alternately arranged along the circumferential direction. It is installed over the entire circumference so as to be replaced. Similarly, the inner diameter magnet field 7 has a plurality of magnetic pole pairs 71 and a cylindrical support member 72 that supports the plurality of magnetic pole pairs 71 . A plurality of magnetic pole pairs 71 are arranged along the entire circumference along the circumferential direction a on the cylindrical outer peripheral surface of the inner diameter magnet field 7 in the same manner as described above. The magnetic pole piece device 1 also has a plurality of magnetic pole pieces 41 (pole pieces) arranged at intervals (equal intervals) over the entire circumference in the circumferential direction a. Then, for example, when the inner diameter side magnet field 7 is rotated, the magnetic flux of the inner diameter side magnet field 7 is modulated by the magnetic pole piece 41 of the pole piece device 1, and the modulated magnetic field and the outer diameter side magnet field 5 act to A rotational torque is generated in the pole piece device 1 .
[0016]
In the embodiment shown in FIGS. 1 to 3, the magnetic gear 9 (flux modulation type magnetic gear) is integrated with the motor to form a magnetic geared motor. More specifically, in this magnetic geared motor, a plurality of coils 6 (see FIG. 2) are installed in an outer magnet field 5 to form a stator. Rotate the magnet 7 (high-speed rotor). As a result, the magnetic pole piece device 1 (low-speed rotor) rotates in accordance with the reduction ratio determined by the ratio of the number of pole pairs of the magnetic pole pairs 51 of the outer magnet field 5 to the number of pole pairs of the magnetic pole pairs 71 of the inner magnet field 7. It is designed to rotate.
[0017]
It should be noted that this magnetic gear 9 can also be applied to a magnetic geared generator in which a magnetic flux modulation type magnetic gear and a generator are integrated. The magnetic geared generator differs from the magnetic geared motor in that the high speed rotor rotates with the rotation of the low speed rotor, but the configuration of the low speed rotor, high speed rotor, and stator is the same as the magnetic geared motor.
[0018]
A cooling medium C such as air or water is supplied to the magnetic geared motor to protect the above components from heat generated during operation. 1-3, as shown in FIG. 3, between the inner magnet field 7 and the pole piece arrangement 1, and between the outer magnet field 5 and the pole piece arrangement 1 An air gap G is formed in each of the . A cooling medium C is supplied to each of these cylindrical air gaps G so as to flow from one end side to the other end side. In addition, the cooling medium C is similarly supplied to the gap formed between the outer magnet field 5 and the housing H located on the outer peripheral side thereof. A gas such as air may be supplied to the gap between the outer magnet field 5 and the housing H, or a water-cooled pipe may be installed, and cooling water or the like may be circulated through the water-cooled pipe. can be
[0019]
In the magnetic gear 9 (flux modulation type magnetic gear) having the configuration described above, the magnetic pole piece device 1 described above receives the magnetic force of the two magnetic fields (5, 7) adjacent to each other on the inner and outer peripheral sides. Therefore, if the rigidity is insufficient, it may deform in the radial direction c and interfere with the magnetic pole pairs (51, 71) of the magnetic field adjacent in the radial direction c. Therefore, the above magnetic pole piece device 1 is configured as follows.
[0020]
(Configuration of magnetic pole piece device 1)
The magnetic pole piece device 1 will be described in detail below with reference to FIGS. 2 and 4 to 9. FIG.
4 to 7 are perspective views schematically showing part of the pole piece device 1 according to one embodiment of the present invention. FIG. 8 is a schematic cross-sectional view along the radial direction c of the pole piece device 1 according to one embodiment of the present invention. FIG. 9 is a diagram for explaining the flow direction of the cooling medium C inside the magnetic gear 9 according to one embodiment of the present invention.
[0021]
As described above, the magnetic pole piece device 1 is a device (member) that constitutes the magnetic gear 9, such as a magnetic flux modulation type magnetic gear that constitutes a magnetic geared motor. It is a device (member) arranged between a high-speed rotor in a magnetic geared motor and an outer magnet field 5 (a stator in a magnetic geared motor). As shown in FIGS. 4 to 8 (as well as in FIG. 2), the magnetic pole piece device 1 includes an outer cover member 2 arranged to face the inner peripheral surface of the outer magnet field 5, and an inner magnet field. It comprises an inner peripheral cover member 3 arranged to face the outer peripheral surface of the magnet 7 and a plurality of magnetic pole pieces 41 (pole pieces) arranged between these two cover members.
[0022]
More specifically, the outer peripheral cover member 2 and the inner peripheral cover member 3 are members having a cylindrical shape as a whole. In addition, the inner peripheral cover member 3 has a diameter smaller than that of the outer peripheral cover member 2, and is arranged coaxially inside the outer peripheral cover member 2 so that the inner peripheral surface of the outer peripheral cover member 2 and the inner peripheral cover member 3 are arranged coaxially. A cylindrical space is formed over the entire circumference between it and the outer peripheral surface of the member 3 . In this cylindrical space, a plurality of long magnetic pole pieces 41 are arranged with their longitudinal directions along the axial direction b and spaced apart in the circumferential direction a. In other words, the two cover members (2, 3) are provided so as to sandwich the plurality of pole pieces 41 therebetween.
[0023]
In the magnetic pole piece device 1 having the configuration described above, as shown in FIGS. 4 to 8, each of the two cover members has a portion facing between two adjacent magnetic pole pieces 41 (inter-adjacent space 42). It has a communication part (23, 33) formed in the . Specifically, as shown in FIGS. 4 to 8, the outer peripheral cover member 2 includes a plurality of outer peripheral side facing portions 21 facing the outer peripheral surfaces of the plurality of magnetic pole pieces 41 described above and two adjacent ones of them. and a plurality of outer peripheral side connecting portions 22 that connect the two outer peripheral side facing portions 21 . Each of the plurality of outer peripheral side connection portions 22 has an outer peripheral side communicating portion 23 that communicates the inner peripheral side and the outer peripheral side of the outer peripheral cover member 2 .
Similarly, the inner peripheral cover member 3 connects the plurality of inner peripheral side facing portions 31 facing the inner peripheral surfaces of the plurality of magnetic pole pieces 41 described above and two adjacent inner peripheral side facing portions 31 among these. and a plurality of inner peripheral side connection portions 32 that Each of the plurality of inner peripheral side connection portions 32 has an inner peripheral side communicating portion 33 that communicates the inner peripheral side and the outer peripheral side of the inner peripheral cover member 3 .
[0024]
In short, the inside of the magnetic pole piece device 1 is surrounded by two adjacent magnetic pole pieces 41, the outer peripheral cover member 2 (outer peripheral side connecting portion 22), and the inner peripheral cover member 3 (inner peripheral side connecting portion 32). A plurality of spaces (inter-adjacent spaces 42) are formed, and each of the plurality of spaces is configured to be communicated in the radial direction c by the outer peripheral side communicating portion 23 and the inner peripheral side communicating portion 33. . As a result, when the cooling medium C is supplied to the air gaps G existing on both the outer peripheral side (diameter direction outer side) and the inner peripheral side (radial direction inner side) of the magnetic pole piece device 1 described above, the communication portion ( 23, 33) allows the cooling medium C to pass through the interior of the pole piece arrangement 1. FIG.
[0025]
Regarding the communicating portions (23, 33), in some embodiments, as shown in FIGS. 4 to 5 and FIGS. It may contain one or more through holes. In the embodiment shown in FIG. 4, both the outer peripheral side communicating portion 23 and the inner peripheral side communicating portion 33 are arranged along the axial direction b and each has a circular cross-sectional shape (three or more in FIG. 4). through holes. On the other hand, in the embodiment shown in FIG. 5, the outer peripheral side communication portion 23 and the inner peripheral side communication portion 33 have one through hole having a rectangular cross-sectional shape elongated in the axial direction b. In addition, in FIGS. 4 and 5, the cross-sectional shape of the through-hole may be, for example, circular, rectangular, or other shape such as elliptical. Moreover, although the cross-sectional diameter of the through-hole is constant, it may not be constant, such as increasing or decreasing along the flow direction.
[0026]
In some other embodiments, as shown in FIG. 6, at least one of the outer cover member 2 or the inner cover member 3 is a plurality of cylindrical tubular members spaced from each other in the axial direction b. At least one of the outer peripheral side communication portion 23 and the inner peripheral side communication portion 33 described above may be formed by the above-described spacing in the axial direction b.
[0027]
In the embodiment shown in FIG. 6, both the outer peripheral cover member 2 and the inner peripheral cover member 3 are composed of two cylindrical members. That is, the outer peripheral cover member 2 has a first tubular member 24a and a second tubular member 24b, and the outer peripheral side communicating portion 23 is provided for each of the first tubular member 24a and the second tubular member 24b. formed by the side walls. Similarly, the inner peripheral cover member 3 has a first tubular member 34a and a second tubular member 34b. is formed by the sidewalls of each of the
[0028]
In FIG. 6, the outer peripheral facing portion 21 and the inner peripheral facing portion 31 do not cover the outer peripheral surface and the inner peripheral surface of the pole piece 41 in the middle of the axial direction b, but some other embodiments may be used. Now, the cover member has a connecting portion (not shown) that axially connects the portions constituting the outer peripheral side facing portion 21 or the inner peripheral side facing portion 31 of the cylindrical member, so that the uncovered portion can be removed. You may make it cover at least one part. In the embodiment shown in FIG. 6, the plurality of magnetic pole pieces 41 are supported by the outer peripheral facing portion 21 and the inner peripheral facing portion 31, but can be firmly supported by the connecting portion (not shown). Become.
[0029]
In some other embodiments, the above two embodiments may be combined. That is, in the embodiments shown in FIGS. 4 to 6, the outer communication portion 23 and the inner communication portion 33 have the same configuration, but for example, the outer communication portion 23 has the configuration shown in FIG. However, they may have different configurations, such as the configuration of the inner peripheral side communication portion 33 shown in FIG.
[0030]
Besides, in the embodiments shown in FIGS. 4 to 8, the plurality of magnetic pole pieces 41 are supported by the outer peripheral cover member 2 and the inner peripheral cover member 3. As shown in FIG. Further, the adjacent spaces 42 between the plurality of magnetic pole pieces 41 between the two cover members are defined by the side surfaces 41 s of the magnetic pole pieces 41 . However, the present invention is not limited to this embodiment. In some other embodiments, the magnetic pole piece device 1 includes a plate-like partition member that positions each magnetic pole piece 41 while connecting the outer peripheral cover member 2 and the inner peripheral cover member 3 together in the radial direction c. 8 , the above-described inter-adjacent space 42 may be partitioned by the partition member 8 . Also, in some other embodiments, the pole piece apparatus 1 may further include a plurality of retaining members (not shown), such as non-magnetic materials, placed in the interadjacent space 42, each pole piece 41 It may be supported by a holding member, or a holding member and the cover member described above. In this case, the holding member has a through-hole communicating with the outer peripheral side communicating portion 23 and the inner peripheral side communicating portion 33, or is formed of a porous body (including a lattice structure) so that the cooling medium C It is configured to be able to pass through its interior. Note that the partition member 8 may exist between the holding member (not shown) and the pole piece 41 .
[0031]
According to the above configuration, the magnetic pole piece device 1 constituting the magnetic gear 9 such as the magnetic flux modulation type magnetic gear is placed between the outer peripheral cover member 2 and the inner peripheral cover member 3 which are coaxially arranged. It has a structure in which a plurality of long magnetic pole pieces 41 (pole pieces) extending along the direction b are arranged at intervals in the circumferential direction a. Further, the outer peripheral cover member 2 and the inner peripheral cover member 3 are respectively provided at portions (outer peripheral side connection portion 22, inner peripheral side connection portion 32) facing between each of the plurality of magnetic pole pieces 41 (inter-adjacent space 42). , communicating portions (outer peripheral side communicating portion 23, inner peripheral side communicating portion 33) for communicating the inner peripheral surface and the outer peripheral surface are formed. That is, the magnetic pole piece device 1 is configured such that the cooling medium C can pass through the interior thereof in the radial direction c by means of the communicating portion.
[0032]
As a result, the rigidity of the magnetic pole piece device 1 is increased by the outer peripheral cover member and the inner peripheral cover member, and the side surface (surface facing the circumferential direction a) of each magnetic pole piece 41 is used as a cooling surface to cool the magnetic pole piece device 1. It can improve performance. Further, by allowing the cooling medium C to flow inside the pole piece device 1, the degree of freedom in designing the cooling path can be greatly improved. Therefore, as will be described later, it is possible to design the magnetic pole piece device 1 so that the temperature of the cooling medium C is kept low throughout the axial direction b. Further, for example, if the flow direction of the cooling medium C inside the magnetic pole piece device 1 is set to one direction, for example, from the inside to the outside in the radial direction c, the jet flow of the cooling medium C after passing through the inside of the magnetic pole piece device 1 is, for example, It is also possible to design such that it directly collides with the magnet of the outer diameter magnet field 5 . Therefore, it is possible to improve the cooling performance of the magnetic field around the pole piece device 1 .
[0033]
Next, several embodiments relating to the arrangement of the outer peripheral side communicating portion 23 and the inner peripheral side communicating portion 33 described above will be described with reference to FIGS. 7 and 8. FIG.
In some embodiments, as shown in FIGS. 7-8, the communicating portions (23, 33) of each of the outer peripheral cover member 2 and the inner peripheral cover member 3 facing the same inter-adjacent space 42 are axially They may be provided at positions shifted from each other in at least one direction of b or the circumferential direction a.
[0034]
That is, in some embodiments, the plurality of outer peripheral side connection portions 22 described above includes a first outer peripheral side connection portion 22 that is an arbitrary outer peripheral side connection portion 22, and the plurality of inner peripheral side connection portions 32 are Including a first inner peripheral side connection portion 32 facing the first outer peripheral side connection portion 22, the outer peripheral side communication portion 23 of the first outer peripheral side connection portion 22 and the first inner peripheral side connection portion 32 The inner peripheral communication portion 33 may be located at different positions in the axial direction b. The cooling medium C is supplied so as to flow through the air gap G described above from one end side toward the other end side in the axial direction b. The communicating portion is formed so as to be upstream in the flow direction of the cooling medium C from the communicating portion serving as the outlet. In the embodiment shown in FIG. 7, the inner peripheral communication portion 33 (inlet) is formed upstream in the flow direction of the cooling medium C from the outer peripheral communication portion 23 (outlet).
[0035]
In some other embodiments, the outer communication portion 23 of the first outer connection portion 22 and the inner communication portion 33 of the first inner connection portion 32 are arranged in the circumferential direction. They may be at different positions in a. When the magnetic gear 9 rotates, the pole piece device 1 rotates in the circumferential direction a (see FIG. 8). Therefore, the communicating portion serving as the inlet of the cooling medium C of the magnetic pole piece device 1 is formed to be forward in the rotational direction from the communicating portion serving as the outlet. In the embodiment shown in FIG. 8, the inner circumference side communicating portion 33 (inlet) is formed on the front side in the rotational direction of the outer peripheral communication portion 23 (outlet).
[0036]
In some other embodiments, the above two embodiments may be combined. In the embodiment shown in FIGS. 7 and 8, the outer communication portion 23 of the first outer connection portion 22 and the inner communication portion 33 of the first inner connection portion 32 are They are located at different positions in the axial direction b and the circumferential direction a. At this time, the cooling medium C is supplied from one end side of the air gap G on the inner diameter magnet field 7 side, passes through the inside of the pole piece device 1, and exits into the air gap G on the outer diameter magnet field 5 side. It's like Further, the inner magnet field 7 rotates clockwise (to the right) with respect to the plane of the paper at a higher speed than the pole piece device 1 . Therefore, as shown in FIG. 8, the inner peripheral side communicating portion 33 is provided on the left side of the outer peripheral side communicating portion 23 in the circumferential direction a of the paper surface. In addition, the positions in the circumferential direction a of the first outer peripheral communication portions 23 facing the same adjacent space 42 are further advanced in the rotational direction than the first inner peripheral communication portions 33 (on the right side of the paper surface). ).
[0037]
It should be noted that, in the embodiment shown in FIGS. 7 and 8, the outer peripheral communication portion 23 and the inner peripheral communication portion 33 each include one through hole. When the outer peripheral side communicating portion 23 and the inner peripheral side communicating portion 33 include a plurality of through holes, they may be shifted as a whole. Further, when at least one of the outer peripheral cover member 2 and the inner peripheral cover member 3 is formed of two or more tubular members, the position of the opening can be adjusted by adjusting the distance between the two or more tubular members. and the size may be varied in the axial direction b.
[0038]
According to the above configuration, the communicating portions (23, 33) of the outer peripheral cover member 2 and the inner peripheral cover member 3 are different in position in at least one of the axial direction b and the circumferential direction a of the pole piece device 1. is provided in As a result, the communicating portion of the two cover members can be formed along the flow direction of the cooling medium C flowing through the air gap G when the magnetic gear 9 rotates (operates).
[0039]
In addition to the above configuration, in some embodiments, as shown in FIG. A communicating portion 53 may be formed. In the embodiment shown in FIG. 9, the communicating portion 53 is formed at the center of the outer diameter magnet field 5 in the axial direction b. As a result, the cooling medium C can pass through the inside of the magnetic gear 9 in the radial direction c by means of the outer peripheral communication portion 23, the inner peripheral communication portion 33, and the communication portion 53 of the outer magnetic field 5. It becomes possible.
[0040]
According to the above configuration, the outer diameter side magnet field 5 is formed with the communicating portion 53 that allows the inner peripheral surface and the outer peripheral surface thereof to communicate with each other. As a result, the cooling medium C can be supplied to the magnetic gear 9 from both ends thereof. Therefore, the cooling medium C flowing inside the magnetic gear 9 can be discharged to the outside of the magnetic gear 9 before the temperature becomes too high due to heat exchange, and the communicating portion 53 is formed in the outer diameter magnet field 5. The temperature of the cooling medium C can be lowered in the entire area inside the magnetic gear 9, compared to the case where it is not provided. Therefore, the cooling capacity of the magnetic gear 9 can be improved.
[0041]
The present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.
(Appendix)
[0042]
(1) A pole piece device (1) according to at least one embodiment of the present invention, comprising:
A magnetic pole piece device (1) arranged between an inner diameter side magnet field (7) and an outer diameter side magnet field (5) in a magnetic gear (9),
an outer peripheral cover member (2) having a cylindrical shape and arranged facing the outer diameter magnet field (5);
an inner peripheral cover member (3) having a cylindrical shape and arranged to face the inner diameter magnet field (7);
a plurality of magnetic pole pieces (41) arranged at intervals in the circumferential direction (a) between the outer peripheral cover member (2) and the inner peripheral cover member (3),
The outer peripheral cover member (2) includes a plurality of outer peripheral side facing portions (21) facing the outer peripheral surfaces of the plurality of magnetic pole pieces (41) and a plurality of outer peripheral side facing portions (21) connecting two adjacent outer peripheral side facing portions (21). and an outer peripheral side connection portion (22) of
The inner peripheral cover member (3) includes a plurality of inner peripheral facing portions (31) facing the inner peripheral surfaces of the plurality of magnetic pole pieces (41) and two adjacent inner peripheral facing portions (31). and a plurality of inner peripheral side connection portions (32) that connect
Each of the plurality of outer peripheral side connection portions (22) has an outer peripheral side communicating portion (23) that communicates the inner peripheral side and the outer peripheral side of the outer peripheral cover member (2),
Each of the plurality of inner peripheral side connection portions (32) has an inner peripheral side communicating portion (33) that communicates the inner peripheral side and the outer peripheral side of the inner peripheral cover member (3).
[0043]
According to the above configuration (1), the magnetic pole piece device (1) constituting the magnetic gear (9) such as the magnetic flux modulation type magnetic gear (9) includes the outer peripheral cover member (2) and the inner peripheral cover member (2) coaxially arranged. Between the cover members (3), a plurality of magnetic pole pieces (41) (pole pieces) whose longitudinal direction extends along the axial direction (b) are arranged at intervals in the circumferential direction (a). have a structure. The outer peripheral cover member (2) and the inner peripheral cover member (3) each have a portion (outer peripheral side connection portion (22 ) and the inner peripheral side connecting portion (32)) are formed with a communicating portion (53) (outer peripheral side communicating portion (23), inner peripheral side communicating portion (33)) for communicating the inner peripheral surface and the outer peripheral surface thereof. ing. In other words, the communication portion (53) allows the cooling medium (C) to pass through the inside of the magnetic pole piece device (1) in the radial direction (c).
[0044]
As a result, while the rigidity of the magnetic pole piece device (1) is increased by the outer peripheral cover member (2) and the inner peripheral cover member (3), the side surface (surface facing the circumferential direction (a)) of each magnetic pole piece (41) is cooled. The use as a surface can improve the cooling performance of the pole piece device (1). Also, by allowing the cooling medium (C) to flow inside the pole piece device (1), the degree of freedom in designing the cooling path can be greatly improved. Therefore, as will be described later, it is possible to design the magnetic pole piece device (1) so as to keep the temperature of the cooling medium (C) low throughout the axial direction (b). Further, for example, if the flow direction of the cooling medium (C) inside the pole piece device (1) is set to one direction, for example, from the inside to the outside in the radial direction (c), after passing through the inside of the pole piece device (1) It is also possible to design such that the jet flow of the cooling medium (C) from the above directly collides with the magnets of the outer diameter magnet field (5), for example. Therefore, it is possible to improve the cooling performance of the magnetic field around the pole piece device (1).
[0045]
(2) In some embodiments, in the configuration of (1) above,
The plurality of outer peripheral side connection portions (22) include a first outer peripheral side connection portion (22),
The plurality of inner peripheral side connection portions (32) include a first inner peripheral side connection portion (32) facing the first outer peripheral side connection portion (22),
The outer communication portion (23) of the first outer connection portion (22) and the inner communication portion (33) of the first inner connection portion (32) are connected to a shaft. They are at different positions in the direction (b).
[0046]
According to the configuration (2) above, the communicating portions (53) of the outer cover member (2) and the inner cover member (3) are located at different positions in the axial direction (b) of the pole piece device (1). is provided in As a result, air gaps are respectively formed between the outer peripheral cover member (2) and the outer magnet field (5) and between the inner peripheral cover member (3) and the inner magnet field (7). (G) along the flow direction of the cooling medium (C) (for example, cooling water, cooling air) flowing from one end side to the other end side in the axial direction (b) By forming the communicating portion (53) of the cover member, the loss when the cooling medium (C) flows through the communicating portion (53) can be reduced. Therefore, the power required to supply the cooling medium (C) to the air gap (G) can be reduced.
[0047]
(3) In some embodiments, in the configurations of (1) to (2) above,
The plurality of outer peripheral side connection portions (22) include a first outer peripheral side connection portion (22),
The plurality of inner peripheral side connection portions (32) include a first inner peripheral side connection portion (32) facing the first outer peripheral side connection portion (22),
The outer communication portion (23) of the first outer connection portion (22) and the inner communication portion (33) of the first inner connection portion (32) They are at different positions in the direction (a).
[0048]
According to the configuration (3) above, the communicating portions (53) of the outer cover member (2) and the inner cover member (3) are located at different positions in the circumferential direction (a) of the pole piece device (1). is provided in As a result, the communicating portion (53) of the two cover members is arranged along the flow direction of the cooling medium (C) flowing through the air gap (G) when the magnetic gear (9) rotates (operates). By forming it, the loss when the cooling medium (C) flows through the communication part (53) can be reduced. Therefore, the power required to supply the cooling medium (C) to the air gap (G) can be reduced.
[0049]
(4) In some embodiments, in the configurations of (1) to (3) above,
At least one of the outer communication portion (23) and the inner communication portion (33) includes one or more through holes.
According to the configuration (4) above, the communication portion (53) of the outer cover member (2) or the inner cover member (3) is formed by one or more through holes formed in the wall surface of the member. . Thereby, the communicating portion (53) can be appropriately provided in the cover member.
[0050]
(5) In some embodiments, in the configurations of (1) to (3) above,
At least one of the outer peripheral cover member (2) and the inner peripheral cover member (3) is formed of a plurality of cylindrical tubular members spaced apart from each other in the axial direction (b),
At least one of the outer peripheral communication portion (23) and the inner peripheral communication portion (33) is formed by the interval in the axial direction (b).
[0051]
According to the configuration (5) above, the communicating portion (53) of the outer peripheral cover member (2) or the inner peripheral cover member (3) is composed of a plurality of cylindrical members having the same diameter coaxially spaced from each other. It is formed by being placed. Thereby, the communicating portion (53) can be appropriately provided in the cover member.
[0052]
(6) The magnetic gear (9) according to at least one embodiment of the present invention is
Inner diameter magnet field (7),
an outer diameter magnet field (5) arranged on the outer diameter side with respect to the inner diameter magnet field (7);
the magnetic pole piece device (1) according to any one of the above (1) to (5) arranged between the inner diameter magnet field (7) and the outer diameter magnet field (5); , provided.
[0053]
According to the configuration (6) above, the magnetic gear (9) is provided with the magnetic pole piece device (1) described above. Thus, it is possible to provide the magnetic gear (9) having the same effects as (1) to (5) above.
[0054]
(7) In some embodiments, in the configuration of (6) above,
The radially outer magnet field (5) has a communicating portion (53) that communicates the inner peripheral side and the outer peripheral side of the radially outer magnet field (5).
[0055]
According to the configuration (7) above, the outer diameter side magnet field (5) is provided with a communicating portion (53) that allows communication between the inner peripheral surface and the outer peripheral surface thereof. In other words, the communicating portion (53) of the outer magnet field (5) allows the cooling medium (C) to pass through the inside of the magnetic gear (9) in the radial direction (c). Thereby, the cooling medium (C) can be supplied to the magnetic gear (9) from both ends thereof. Therefore, the cooling medium (C) flowing inside the magnetic gear (9) can be discharged to the outside of the magnetic gear (9) before the temperature becomes too high due to heat exchange, and the outer diameter side magnet field ( 5), the temperature of the cooling medium (C) is reduced throughout the entire interior of the magnetic gear (9) compared to the case where the communication portion (53) is not formed temperature can be lowered. Therefore, the cooling capacity of the magnetic gear (9) can be improved.
[0056]
(8) A magnetic geared motor according to at least one embodiment of the present invention,
The magnetic gear (9) according to (6) to (7) above is provided.
According to the configuration (8) above, it is possible to provide a magnetic geared motor that exhibits the same effects as (6) to (7) above.
[0057]
(9) A magnetic geared generator according to at least one embodiment of the present invention,
The magnetic gear (9) according to (6) to (7) above is provided.
According to the configuration of (9) above, it is possible to provide a magnetically geared generator that exhibits the same effects as those of (6) to (7) above.
Code explanation
[0058]
1 Magnetic pole piece device
2 Peripheral cover member
21 Circumference side facing part
22 Outer peripheral side connection
23 Circumference side communication part
24a First cylindrical member
24b Second cylindrical member
3 Inner circumference cover member
31 Inner peripheral side facing part
32 Inner peripheral side connection
33 Internal communication part
34a First cylindrical member
34b Second cylindrical member
41 magnetic pole piece
41s side of magnetic pole piece
42 Adjacent space
5 Outside diameter magnet field
51 Magnetic pole pair
52 Support member
53 Communicating part
6 Coil
7 Inner diameter magnet field
71 Magnetic pole pair
72 Support member
8 Compartment member
9 Magnetic gear
C Cooling medium
G Air gap
H Housing
a Circumferential direction
b Axial direction
c Radial direction
l Axis line
The scope of the claims
[Claim 1]
A magnetic pole piece device disposed between an inner diameter side magnet field and an outer diameter side magnet field in a magnetic gear,
an outer peripheral cover member having a cylindrical shape and arranged to face the outer diameter side magnet field;
an inner circumference cover member having a cylindrical shape and arranged facing the inner diameter side magnet field;
a plurality of magnetic pole pieces arranged at intervals in the circumferential direction between the outer peripheral cover member and the inner peripheral cover member,
The outer peripheral cover member includes a plurality of outer peripheral side facing portions facing the outer peripheral surfaces of the plurality of magnetic pole pieces, and a plurality of outer peripheral side connecting portions connecting two adjacent outer peripheral side facing portions,
The inner peripheral cover member includes: a plurality of inner peripheral side facing portions facing the inner peripheral surfaces of the plurality of magnetic pole pieces; a plurality of inner peripheral side connecting portions connecting two adjacent inner peripheral side facing portions; including
Each of the plurality of outer peripheral side connection portions has an outer peripheral side communication portion that communicates the inner peripheral side and the outer peripheral side of the outer peripheral cover member,
The magnetic pole piece device, wherein each of the plurality of inner peripheral side connection portions has an inner peripheral side communicating portion that communicates the inner peripheral side and the outer peripheral side of the inner peripheral cover member.
[Claim 2]
The plurality of outer peripheral side connection portions include a first outer peripheral side connection portion,
The plurality of inner peripheral side connection portions include a first inner peripheral side connection portion facing the first outer peripheral side connection portion,
2. The outer communicating portion of the first outer connecting portion and the inner communicating portion of the first inner connecting portion are located at different positions in the axial direction. pole piece device.
[Claim 3]
The plurality of outer peripheral side connection portions include a first outer peripheral side connection portion,
The plurality of inner peripheral side connection portions include a first inner peripheral side connection portion facing the first outer peripheral side connection portion,
3. The outer communication portion of the first outer connection portion and the inner communication portion of the first inner connection portion are located at different positions in the circumferential direction. A pole piece device as described in .
[Claim 4]
The magnetic pole piece device according to any one of claims 1 to 3, wherein at least one of the outer peripheral communication portion and the inner peripheral communication portion includes one or more through holes.
[Claim 5]
At least one of the outer peripheral cover member and the inner peripheral cover member is formed of a plurality of cylindrical tubular members spaced apart from each other in the axial direction,
The magnetic pole piece device according to any one of claims 1 to 3, wherein at least one of the outer peripheral communication portion and the inner peripheral communication portion is formed by the spacing in the axial direction.
[Claim 6]
　The inner diameter side magnet field,
an outer diameter magnet field arranged on the outer diameter side with respect to the inner diameter magnet field;
and a magnetic pole piece device according to any one of claims 1 to 5, which is arranged between the inner diameter side magnet field and the outer diameter side magnet field.
[Claim 7]
The magnetic gear according to claim 6, wherein the outer diameter side magnet field has a communicating portion that communicates the inner peripheral side and the outer peripheral side of the outer diameter side magnet field.
[Claim 8]
A magnetic geared motor comprising the magnetic gear according to claim 6 or 7.
[Claim 9]
A magnetic geared generator comprising the magnetic gear according to claim 6 or 7.