Title of invention: Outer magnet field and magnetic gear
Technical field
[0001]
The present disclosure relates to an outer diameter magnet field and a magnetic gear provided with the outer diameter magnet field.
This application claims priority based on Japanese Patent Application No. 2020-009607 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 is rotated according to the reduction ratio. 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]
In a magnetic geared motor or a generator that uses a magnetic gear in which a coil is installed in the outer magnet field, the plurality of magnetic pole pairs (hereinafter referred to as stator magnets) that the outer magnet field has are close to the coil. position and subject to the heat generated by the coil. The stator magnets are also in close proximity to the plurality of pole pieces of the pole piece arrangement, and are also subject to thermal effects such as iron loss at these pole pieces. Here, the air gap between the pole piece arrangement and the two magnet fields which are adjacent (opposed) to it on the radially outer and inner sides, respectively, is usually supplied with a cooling medium (for example air) or the like. active heat removal is achieved.
[0006]
However, the temperature tolerance (temperature spec) of the stator magnet is usually stricter than that of the coil. In addition, since the cooling medium supplied to the air gap flows along the air gap along the axial direction, the longer the air gap in the axial direction, the higher the temperature of the cooling medium. decreases. For this reason, the temperature of the stator magnet may exceed the specification even though the temperature of the coil is within the allowable temperature range and there is some margin.
[0007]
In view of the circumstances described above, it is an object of at least one embodiment of the present invention to provide an outer diameter side magnetic field of a magnetic gear in which the ability to cool the magnetic pole pair is improved.
Means to solve problems
[0008]
The outer diameter side magnet field according to at least one embodiment of the present invention is
The outer diameter side magnet field of the magnetic gear arranged on the outer circumference side of the plurality of magnetic pole pieces arranged along the circumferential direction on the outer circumference side of the inner diameter side magnet field,
a plurality of magnetic pole pairs arranged along the circumferential direction on the outer peripheral side of the plurality of magnetic pole pieces;
a supporting member that supports the plurality of magnetic pole pairs from the outer peripheral side;
and a coil installed on the support member,
The support member is
the yoke and
a tooth portion protruding radially inward from the yoke portion and having an iron core portion around which the coil is wound;
and a claw portion extending in the circumferential direction from the radially inner portion of the tooth portion,
A space is provided between the outer peripheral surface of the claw portion and the radially inner end surface of the coil.
[0009]
The magnetic gear according to at least one embodiment of the present invention is
　The above outer diameter side magnet field,
an inner diameter side magnet field arranged on the inner diameter side with respect to the outer diameter side magnet field,
and a plurality of magnetic pole pieces arranged along the circumferential direction between the outer magnet field and the inner magnet field.
Effect of the invention
[0010]
According to at least one embodiment of the present invention, there is provided an outer-diameter-side magnetic field of a magnetic gear with improved cooling performance for the magnetic pole pair.
Brief description of the drawing
[0011]
1 is a radial cross-sectional view of a magnetic gear according to an embodiment of the present invention; FIG.
2 is a partially enlarged view of the magnetic gear shown in FIG. 1; FIG.
3 is a cross-sectional view along the axial direction of a magnetic gear according to an embodiment of the present invention; FIG.
4 is a cross-sectional view schematically showing part of an outer diameter side magnet field according to an embodiment of the present invention; FIG.
5 is a cross-sectional view schematically showing part of an outer diameter side magnet field according to an embodiment of the present invention; FIG.
6 is a cross-sectional view schematically showing part of an outer diameter side magnet field according to an embodiment of the present invention; FIG.
7 is a cross-sectional view schematically showing part of an outer diameter side magnet field according to an embodiment of the present invention; FIG.
8 is a cross-sectional view schematically showing part of an outer diameter side magnet field according to an 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)
FIG. 1 is a cross-sectional view 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 cross-sectional view 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 rotation direction of the magnetic gear 9 (magnetic pole piece device 5) is the circumferential direction a, the direction along the rotation axis of the magnetic gear 9 is the axial direction b, and the circumferential direction a and the axial direction b A direction (radial direction) orthogonal to is defined 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 1 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 5 (center rotor) having an overall cylindrical shape. there is Then, the magnet field 1 on the outer diameter side and the magnet field 7 on the inner diameter side are arranged on the same axis line l (coaxial) and at a constant distance in the radial direction c so that the magnetic pole piece device 5 is arranged between them. are arranged with an interval (air gap G) of . That is, the outer magnet field 1 is arranged radially outward (outer diameter side) with respect to the inner magnet field 7 . Also, the pole piece device 5 is arranged between the inner diameter magnet field 7 and the outer diameter magnet field 1 . These outer magnet field 1, inner magnet field 7 and pole piece device 5 are arranged concentrically.
[0015]
In addition, as shown in FIG. 2, the radially outer magnetic field 1 and the inner magnetic field 7 are circumferentially distributed in a cross section cut along the radial direction c of the magnetic gear 9 (hereinafter referred to as a radial cross section). It has a magnetic pole pair (2, 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 1 has a plurality of magnetic pole pairs 2 and a support member 3 that supports the plurality of magnetic pole pairs 2 . On the cylindrical inner peripheral surface of the outer magnet field 1, a plurality of magnetic pole pairs 2 are arranged in a state in which 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 inner diameter magnetic pole pairs 71 and a columnar inner diameter support member 72 that supports the inner diameter magnetic pole pairs 71 . A plurality of inner magnetic pole pairs 71 are arranged on the cylindrical outer peripheral surface of the inner magnetic field 7 along the entire circumference along the circumferential direction a in the same manner as described above. Moreover, the magnetic pole piece device 5 has a plurality of magnetic pole pieces 51 (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 51 of the pole piece device 5, and the modulated magnetic field and the outer diameter side magnet field 1 act to Rotational torque is generated in the pole piece device 5 .
[0016]
2, the magnetic pole piece device 5 includes an outer peripheral cover member 52 and an inner peripheral cover member 53 which are arranged outside and inside in the radial direction c so as to sandwich the plurality of magnetic pole pieces 51. may have. The outer peripheral cover member 52 and the inner peripheral cover member 53 are members each having a cylindrical shape, and the diameter of the inner peripheral cover member 53 is smaller than the diameter of the outer peripheral cover member 52 . Therefore, when the inner peripheral cover member 53 is coaxially arranged inside the outer peripheral cover member 52, a cylindrical space is formed over the entire circumference between the inner peripheral surface of the outer peripheral cover member 52 and the outer peripheral surface of the inner peripheral cover member 53. It is formed. In this cylindrical space, a plurality of long magnetic pole pieces 51 are arranged with their longitudinal directions along the axial direction b and spaced apart in the circumferential direction a. At this time, the space between each of the plurality of magnetic pole pieces 51 (inter-adjacent space 54) may be a space, or a non-magnetic material may be provided. However, the magnetic pole piece device 5 may not have the two cover members described above, and may include a non-magnetic material placed between each of the plurality of magnetic pole pieces 51 .
[0017]
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 4 (see FIG. 2) are installed in an outer magnet field 1 to form a stator, and the magnetomotive force of the coils 4 generates an inner magnet field. Rotate the magnet 7 (high-speed rotor). As a result, the magnetic pole piece device 5 (low-speed rotor) is set according to the reduction ratio determined by the ratio of the number of pole pairs of the inner magnetic pole pairs 71 of the inner magnetic field 7 to the number of pole pairs of the magnetic pole pairs 2 of the outer magnetic field 1. is designed to rotate.
[0018]
The 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 configurations of the low speed rotor, high speed rotor, and stator are the same as the magnetic geared motor.
[0019]
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. In the embodiment shown in FIGS. 1-3, as shown in FIG. , air gaps G are formed between the inner magnet field 7 and the pole piece device 5, and between the outer magnet field 1 and the pole piece device 5, respectively. 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 1 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 1 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
[0020]
In the magnetic gear 9 (flux modulation type magnetic gear) having the above-described configuration, the outer diameter side magnetic field 1 described above is the outer diameter side A plurality of magnetic pole pairs 2 (hereinafter referred to as stator magnets) of the magnetic field 1 are affected by heat generated from the coils 4 and the magnetic pole piece devices 5 (the plurality of magnetic pole pieces 51), etc., which are arranged close to each other. However, the temperature tolerance of the stator magnet is tighter than that of the coil 4, for example, the upper limit of the stator magnet temperature tolerance is 110°C and the coil is 180°C. In addition, the cooling medium C supplied to the air gap G flows through the air gap G along the axial direction b. Cooling performance decreases as it goes downstream. Therefore, even if cooling is performed by supplying the cooling medium C to the air gap G, there is a possibility that the temperature of the stator magnet may exceed the specification although the temperature of the coil 4 has a margin within the temperature tolerance value. There is Therefore, the outer diameter magnet field 1 is configured as follows.
[0021]
(Common configuration of outer diameter magnet field 1)
The outer diameter magnet field 1 will be described in detail below with reference to FIGS. 2 and 4 to 8. FIG.
4 to 8 are cross-sectional views schematically showing part of the outer diameter side magnet field 1 according to one embodiment of the present invention.
[0022]
As described above, the outer magnet field 1 is formed on the outer periphery of the plurality of magnetic pole pieces 51 (the magnetic pole piece device 5) arranged along the circumferential direction a on the outer peripheral side of the cylindrical inner magnet field 7. It is a magnetic field (stator member) arranged on the side. As shown in FIGS. 2 and 4 to 8, the outer diameter side magnetic field 1 is arranged (annularly arranged) along the circumferential direction a on the outer peripheral side of the magnetic pole piece device 5 having a plurality of magnetic pole pieces 51. a plurality of magnetic pole pairs 2 , a support member 3 supporting the plurality of magnetic pole pairs 2 from the outer peripheral side, and a coil 4 installed on the support member 3 .
[0023]
More specifically, the support member 3 has a yoke portion 31 having a generally cylindrical shape and an iron core portion 32p protruding radially inward from the yoke portion 31 and around which the coil 4 is wound. It includes teeth portions 32 and claw portions 33 extending from the teeth portions 32 on both sides in the circumferential direction a. The inner peripheral surface 3s of the support member 3 is formed by the inner peripheral surfaces of the tooth portions 32 and the claw portions 33, and the plurality of magnetic pole pairs 2 are held on the inner peripheral surface 3s.
[0024]
Specifically, in the embodiments shown in FIGS. 2 and 4 to 8, as shown in FIGS. 4 to 8, the support member 3 has a plurality of protrusions protruding radially inward from its inner peripheral surface 3s. 34. The protrusions 34 may be provided continuously or discretely along the axial direction b. Each magnetic pole pair 2 is supported (held) by being fitted between two adjacent protrusions 34 among the plurality of protrusions 34 .
(First embodiment)
[0025]
In some embodiments of the radially outer magnet field 1 having the configuration described above, as shown in FIGS. ) and the surface (end face 4s) of the end of the coil 4 facing radially inward is provided with a space (coil end space Sc). In some embodiments, the coil end space Sc may be provided over the entire outer peripheral surface 33s of the claw portion 33 as illustrated. In the embodiment shown in FIGS. 2 and 4 to 5, the coil 4 faces the support member 3 (iron core portion 32p) on a surface facing the circumferential direction a in a radial cross-sectional view, as illustrated. It is installed away from the claw portion 33 so that the outer peripheral surface 33s of the claw portion 33 does not enter the inner space surrounded by the inner surface 4i. As a result, the end face 4 s of the coil 4 is separated over the entire outer peripheral face 33 s of the claw portion 33 .
[0026]
However, the present invention is not limited to this embodiment. In some other embodiments, as shown by the dashed line in FIG. 4, the claw portion 33 is installed such that a part of the outer peripheral surface 33s of the claw portion 33 fits in the inner space of the coil 4 in a radial cross-sectional view. Only a part of the outer peripheral surface 33 s of the claw portion 33 may be separated from the end surface 4 s of the coil 4 . For example, the dashed line in FIG. 4 indicates that the portion from the base of the claw portion 33 to the vicinity of the center of the length in the radial direction c of the outer peripheral surface is accommodated in the inner space of the coil 4 in a radial cross-sectional view.
[0027]
According to the above configuration, the outer magnet field 1 includes a plurality of magnetic pole pairs 2 and a support member 3 for the plurality of magnetic pole pairs 2 (stator magnets). A space (coil end space Sc) is provided between an outer peripheral surface 33 s of the coil 4 and an end surface 4 s of the coil 4 facing radially inward. As a result, the contact area between the coil 4 and the claw portion 33 can be reduced or eliminated, and the amount of heat transferred through the route of the coil 4→claw portion 33→magnetic pole pair 2 can be suppressed. In other words, the main heat transfer path is coil 4→teeth portion 32 (iron core portion 32p)→claw portion 33→magnetic pole pair 2, so the heat conduction resistance between coil 4 and magnetic pole pair 2 increases, 4 to the magnetic pole pair 2 can be reduced. In addition, since the cooling medium C can flow through the above space, the surface (cooling surface) of the coil 4 and the support member 3 in contact with the cooling medium C can be increased. can be made to have a structure that is easier to cool. Therefore, it is possible to more reliably prevent the temperature of the magnetic pole pair 2 of the outer diameter side magnet field 1 from rising beyond the upper limit, and the reliability of the outer diameter side magnet field is improved. A magnet 1 can be provided.
[0028]
In some of the above-described embodiments, as shown in FIGS. 4 and 5, a low-thermal-conductivity material having a lower thermal conductivity than the surroundings is provided between the above-described yoke portion 31 and the inner peripheral surface 3s of the support member 3. A conductive layer L may be formed. Since the coil 4 and the plurality of magnetic pole pairs 2 are connected via the support member 3, heat is transferred between the coil 4 and the plurality of magnetic pole pairs 2 via the support member 3. . Therefore, a low heat conductive layer L is provided between the above-mentioned portions of the support member 3 so as to intersect with the heat transfer path. In other words, the low thermal conductivity layer L is provided on the support member 3 so that the heat transferred between the coil 4 and the plurality of magnetic pole pairs 2 must pass through the low thermal conductivity layer L.
[0029]
In the embodiment shown in FIGS. 4 and 5, the low thermal conductivity layer L is formed so as to include the iron core portion 32p. More specifically, the low thermal conductivity layer L is provided so as to connect positions on the surface of the iron core portion 32p that are not accommodated in the inner space (described above) of the coil 4 . As a result, the area of ​​the low heat conductive layer L can be reduced.
[0030]
However, the present invention is not limited to this embodiment. In some other embodiments, the low thermal conductivity layer L may be provided in addition to the iron core portion 32p. Specifically, the low thermal conductivity layer L may be provided over both the portion including the iron core portion 32p in the teeth portion 32 or the portion including the portion other than the iron core portion 32p and the claw portion 33 . For example, when the coil 4 is installed as indicated by the dashed line in FIG. 4 , the low heat conductive layer L is provided so as to connect the outer peripheral surfaces 33 s forming the coil end space Sc in the claw portion 33 .
[0031]
According to the above configuration, the low thermal conductivity layer L is provided on the heat path between the coil 4 and each magnetic pole pair 2. As a result, the heat of the coil 4 via the support member 3 can be made less likely to be transmitted to the magnetic pole pair 2, and the magnetic pole pair 2, which has a relatively strict temperature tolerance value, is stronger than the coil 4, which has a relatively gentle temperature tolerance value. By giving priority to the protection of , it is possible to more reliably protect the magnetic pole pair 2 of the outer diameter magnet field 1 against heat.
[0032]
The above-described low heat conductive layer L may be formed on the joint surfaces of the support member 3 divided into a plurality of parts, such as two parts. Specifically, in some embodiments, as shown in FIGS. 4 and 5, the support member 3 includes an outer peripheral support member 3a having at least the yoke portion 31 described above, and an inner peripheral support member 3a. The inner peripheral support member 3b supported on the peripheral side and having at least a part of the claw portion 33 may be joined together. In this case, the low heat conductive layer L is formed between the outer peripheral side support member 3a and the inner peripheral side support member 3b.
[0033]
In the embodiment shown in FIGS. 4 and 5, the support member 3 is divided into two at a position not accommodated in the inner space (described above) of the coil 4 in the iron core portion 32p. It is formed by joining the support member 3b.
In the embodiment shown in FIG. 4, the outer peripheral side support member 3a and the inner peripheral side support member 3b are joined with an adhesive capable of forming the low thermal conductive layer L, thereby providing the support member 3 with a low thermal conductivity. A conductive layer L is formed. On the other hand, in the embodiment shown in FIG. 5, the outer peripheral side support member 3a and the inner peripheral side support member 3b each have a fitting portion, and a member capable of constituting the low heat conductive layer L is interposed. A low heat conductive layer L is formed on the support member 3 by being fitted together in this state.
[0034]
According to the above configuration, the support member 3 is formed by the outer peripheral side support member 3a and the inner peripheral side support member 3b, and the low heat conductive layer L is provided between these joints. As a result, the low thermal conductivity layer L can be easily and appropriately formed on the outer diameter magnet field 1 .
(Second embodiment)
[0035]
Further, in the outer magnet field 1 having the configuration described above, in some embodiments, as shown in FIGS. At least a portion between the outer peripheral surface 2 s and the facing surface 3 c of the inner peripheral surface 3 s of the support member 3 facing the outer peripheral surface 2 s of each of the plurality of magnetic pole pairs 2 is provided along the axial direction b. A space (magnet-side space Sm) is formed. This magnet-side space Sm is formed over the entire length of the outer diameter-side magnet field 1 in the axial direction b.
[0036]
More specifically, in some embodiments, the magnet-side space Sm is a support-member-side recessed portion 3d extending along the axial direction b in the facing surface 3c of the support member 3, as shown in FIG. may be formed by In some other embodiments, as shown in FIG. 7, the magnet-side space Sm is formed by a magnetic pole-pair-side recessed portion 2d extending along the axial direction b in the facing surface 3c of the support member 3. Also good. In some other embodiments, the magnet-side space Sm may be formed by both the support member-side recess 3d and the magnetic pole pair-side recess 2d.
[0037]
Alternatively, in some other embodiments, as shown in FIG. It may be formed by being held at a constant distance from 3c (inner peripheral surface 3s) in the circumferential direction a. In the embodiment shown in FIG. 8, the length in the radial direction c of each magnetic pole pair 2 is shorter than in FIGS. Further, when each magnetic pole pair 2 is held by the two protruding portions 34 adjacent to each other as described above, the magnetic pole pair 2 is held in a state of being brought closer to the magnetic pole piece device 5 side, so that the magnet-side space Sm is formed.
[0038]
According to the above configuration, a space (magnet-side space Sm) is provided between the magnetic pole pair 2 (magnet) of the outer diameter magnet field 1 and the support member 3 that supports the magnetic pole pair 2 . As a result, the heat conduction resistance between the coil 4 and the magnetic pole pair 2 can be increased, and the amount of heat transferred from the coil 4 to the magnetic pole pair 2 can be reduced. Also, for example For example, since the cooling medium C such as cooling air can pass through the space, the cooling surface of the magnetic pole pairs 2 of the outer magnet field 1 can be increased, and the cooling capacity can be improved. can be done.
[0039]
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.
For example, the outer diameter side magnet field 1 may include the coil end space Sc and the magnet side space Sm described above.
(Appendix)
[0040]
(1) The outer diameter magnet field (1) according to at least one embodiment of the present invention is
The outer diameter side magnet field ( 1) and
a plurality of magnetic pole pairs (2) arranged along the circumferential direction (a) on the outer peripheral side of the plurality of magnetic pole pieces (51);
a support member (3) that supports the plurality of magnetic pole pairs (2) from the outer peripheral side;
a coil (4) installed on the support member (3),
The support member (3) is
the yoke portion (31) and
a tooth portion (32) projecting radially (c) inward from the yoke portion (31) and having an iron core portion (32p) around which the coil (4) is wound;
a claw portion (33) extending in the circumferential direction (a) from the inner portion in the radial direction (c) of the tooth portion (32),
A space is provided between the outer peripheral surface of the claw portion (33) and the inner end surface of the coil (4) in the radial direction (c).
[0041]
According to the configuration (1) above, the outer diameter magnet field (1) includes a plurality of magnetic pole pairs (2) (stator magnets) and support members (3) for the plurality of magnetic pole pairs (2). A space is provided between the outer peripheral surface of the claw portion (33) of the support member (3) and the end surface of the coil (4) facing inward in the radial direction (c). As a result, the contact area between the coil (4) and the claw (33) can be reduced or eliminated, and the amount of heat transmitted through the route of coil (4)→claw (33)→magnetic pole pair (2) is suppressed. be able to. In other words, the main heat transfer path is coil (4)→teeth (32) (iron core (32p))→claw (33)→magnetic pole pair (2). 2), the amount of heat transferred from the coil (4) to the magnetic pole pair (2) can be reduced. In addition, since the cooling medium (C) can flow through the space, the surfaces (cooling surfaces) in contact with the cooling medium (C) in the coil (4) and the support member (3) can be increased. , the outer diameter side magnet field (1) can be made to be more easily cooled. Therefore, it is possible to more reliably prevent a situation in which the temperature of the magnetic pole pair (2) of the outer magnet field (1) exceeds the upper limit value, and the reliability is improved. A radial magnet field (1) can be provided.
[0042]
(2) In some embodiments, in the configuration of (1) above,
A low heat conductive layer (L) having a lower heat conductivity than the surroundings is formed between the yoke portion (31) and the inner peripheral surface of the support member (3).
[0043]
According to the configuration (2) above, the low thermal conductivity layer (L) is provided on the heat path between the coil (4) and each magnetic pole pair (2). As a result, the heat of the coil (4) via the support member (3) is less likely to be transmitted to the magnetic pole pair (2). By giving priority to the magnetic pole pair (2) having a relatively severe R, and protecting it against heat, the magnetic pole pair (2) of the outer magnet field (1) can be protected against heat more reliably.
[0044]
(3) In some embodiments, in the configuration of (2) above,
The support member (3) is
an outer peripheral support member (3a) having at least the yoke portion (31);
an inner peripheral side support member (3b) supported on the inner peripheral side of the outer peripheral side support member (3a), the inner peripheral side support member (3b) having at least a part of the claw portion (33); including
The low heat conductive layer (L) is formed between the outer peripheral support member (3a) and the inner peripheral support member (3b).
[0045]
According to the configuration (3) above, the support member (3) is formed of the outer peripheral side support member (3a) and the inner peripheral side support member (3b), and the low heat conductive layer (L) joins them. It is provided between the departments. Thereby, the low thermal conductivity layer (L) can be easily and appropriately formed on the outer diameter magnet field (1).
[0046]
(4) The outer diameter magnet field (1) according to at least one embodiment of the present invention is
The outer diameter side magnet field ( 1) and
a plurality of magnetic pole pairs (2) arranged along the circumferential direction (a) on the outer peripheral side of the plurality of magnetic pole pieces (51);
a support member (3) that supports the plurality of magnetic pole pairs (2) from the outer peripheral side,
At least between the outer peripheral surface of each of the plurality of magnetic pole pairs (2) and the opposing surface facing the outer peripheral surface of each of the plurality of magnetic pole pairs (2) on the inner peripheral surface of the support member (3) A space is partially formed along the axial direction (b).
[0047]
According to the configuration (4) above, a space is provided between the magnetic pole pair (2) of the outer magnet field (1) and the support member (3) that supports the magnetic pole pair (2). As a result, the heat conduction resistance between the coil (4) and the magnetic pole pair (2) can be increased, and the amount of heat transferred from the coil (4) to the magnetic pole pair (2) can be reduced. In addition, since the cooling medium (C) such as cooling air can pass through the space, the cooling surface of the magnetic pole pair (2) of the outer magnet field (1) can be increased. , can improve its cooling capacity.
[0048]
(5) In some embodiments, in the configuration of (4) above,
The space is formed by a support member (3) side recess extending along the axial direction (b) in the facing surface of the support member (3).
According to the configuration (5) above, the above space is provided by a concave groove formed on the support member (3) side. Thereby, the above-mentioned space can be appropriately provided.
[0049]
(6) In some embodiments, in the configurations of (4) to (5) above,
The space is formed by a recess on the side of the magnetic pole pair (2) extending along the axial direction (b) on the outer peripheral surface of each of the magnetic pole pairs (2).
According to the configuration (6) above, the above space is provided by the recess formed on the magnetic pole pair (2) side of the outer diameter magnet field (1). Thereby, the above-mentioned space can be appropriately provided.
[0050]
(7) In some embodiments, in the configuration of (4) above,
The space is formed by the support member (3) holding the magnetic pole pair (2) apart from the facing surface of the support member (3) by a constant distance in the circumferential direction (a). formed.
According to the configuration (7) above, the space is formed by the holding portion separating the inner peripheral surface of the holding portion and the outer peripheral surface of the magnetic pole pair (2) of the outer diameter magnet field (1), which are opposed to each other. It is provided by being held as Thereby, the above-mentioned space can be appropriately provided.
[0051]
(8) The magnetic gear (9) according to at least one embodiment of the present invention is
the outer diameter side magnet field (1) according to any one of (1) to (7) above;
an inner diameter magnet field (7) arranged on the inner diameter side with respect to the outer diameter magnet field (1);
and a plurality of magnetic pole pieces (51) arranged along the circumferential direction (a) between the outer magnet field (1) and the inner magnet field (7).
[0052]
According to the configuration (8) above, the magnetic gear (9), such as a magnetic geared motor, is provided with the outer diameter magnet field (1) described above. This provides the same effects as (1) to (7) above.
Code explanation
[0053]
1 Outer diameter magnet field
2 Magnetic pole pairs
2s The outer peripheral surface of the magnetic pole pair
2d Magnetic pole pair side recess
3 Support member
3s Inner peripheral surface of support member
3c Opposing surface of the supporting member to the magnetic pole pair
31 yoke part
32 teeth part
32p iron core
33 claw part
33s Peripheral surface of claw
34 Protruding part
3a Peripheral side support member
3b Inner peripheral support member
3d Support member side recess
4 Coil
4s Coil end face
4i Inner surface of coil
5 Magnetic pole piece device
51 magnetic pole piece
52 Peripheral cover member
53 Inner circumference cover member
54 Adjacent space
7 Inner diameter magnet field
71 Inside diameter magnetic pole pair
72 Inner diameter support member
9 Magnetic gear
Sc Coil end space
Sm 　Magnet side space
L Low thermal conductivity layer
C Cooling medium
G Air gap
H Housing
l Axis line
a Circumferential direction
b Axial direction
c Radial direction
The scope of the claims
[Claim 1]
The outer diameter side magnet field of the magnetic gear arranged on the outer circumference side of the plurality of magnetic pole pieces arranged along the circumferential direction on the outer circumference side of the inner diameter side magnet field,
a plurality of magnetic pole pairs arranged along the circumferential direction on the outer peripheral side of the plurality of magnetic pole pieces;
a supporting member that supports the plurality of magnetic pole pairs from the outer peripheral side;
and a coil installed on the support member,
The support member is
the yoke and
a tooth portion protruding radially inward from the yoke portion and having an iron core portion around which the coil is wound;
and a claw portion extending in the circumferential direction from the radially inner portion of the tooth portion,
An outer diameter side magnet field in which a space is provided between the outer peripheral surface of the claw portion and the radially inner end surface of the coil.
[Claim 2]
The outer diameter side magnet field according to claim 1, wherein a low thermal conductivity layer having a smaller thermal conductivity than the surroundings is formed between the yoke portion and the inner peripheral surface of the support member.
[Claim 3]
The support member is
an outer peripheral support member having at least the yoke portion;
an inner peripheral side support member supported on the inner peripheral side of the outer peripheral side support member, the inner peripheral side support member having at least a part of the claw portion,
The outer diameter side magnet field according to claim 2, wherein the low heat conductive layer is formed between the outer circumference side support member and the inner circumference side support member.
[Claim 4]
The outer diameter side magnet field of the magnetic gear arranged on the outer circumference side of the plurality of magnetic pole pieces arranged along the circumferential direction on the outer circumference side of the inner diameter side magnet field,
a plurality of magnetic pole pairs arranged along the circumferential direction on the outer peripheral side of the plurality of magnetic pole pieces;
and a support member that supports the plurality of magnetic pole pairs from the outer peripheral side,
At least a portion between the outer peripheral surface of each of the plurality of magnetic pole pairs and the opposing surface of the inner peripheral surface of the support member facing the outer peripheral surface of each of the plurality of magnetic pole pairs is provided along the axial direction. The outer diameter side magnet field in which a space is formed.
[Claim 5]
The radially outer magnet field according to claim 4, wherein the space is formed by a supporting member-side concave portion extending axially along the facing surface of the supporting member.
[Claim 6]
6. The outer diameter side magnet field system according to claim 4 or 5, wherein the space is formed by a magnetic pole pair side concave portion extending along the axial direction in the outer peripheral surface of each of the magnetic pole pairs.
[Claim 7]
5. The outer diameter according to claim 4, wherein the space is formed by the support member so that the magnetic pole pair is held at a constant distance in the circumferential direction from the facing surface of the support member. Side magnet field.
[Claim 8]
the outer diameter side magnet field according to any one of claims 1 to 7;
an inner diameter side magnet field arranged on the inner diameter side with respect to the outer diameter side magnet field,
A magnetic gear comprising a plurality of magnetic pole pieces arranged along the circumferential direction between the outer magnet field and the inner magnet field.