Pole piece rotor and magnetic geared electrical machine

Abstract

This pole piece rotor is provided in a magnetic gear electric machine. The pole piece rotor comprises: an annular body including a plurality of pole pieces and a plurality of non-magnetic bodies which are alternately arranged in the circumferential direction of the magnetic gear electric machine; and a connection member including a body portion that connects the end portion of the annular body on one side in the axial direction and the rotating shaft of the magnetic gear electric machine to each other. The connection member further includes a projection portion that projects from the body portion to the other side in the axial direction further on the radially inner side than the annular body, wherein the outer circumferential surface of the projection portion has a non-magnetic body support surface for supporting at least one of the plurality of non-magnetic bodies.

Description

[0001] The present disclosure relates to a pole piece rotor and a magnetic geared electrical machine. The present application claims priority based on Japanese Patent Application No. 2023-000366 filed on January 5,2023, the entire content of which is incorporated herein by reference. BACKGROUND ART

[0002] Conventionally, a magnetic geared electrical machine with a pole piece rotor is known (see, for example, Patent Document 1). A pole piece annular unit constituting the pole piece rotor includes a plurality of pole pieces and a plurality of non-magnetic bodies arranged alternately along the circumferential direction. Each pole piece and each non-magnetic body extend in the axial direction. Citation List Patent Literature

[0003] Patent Document 1: WO2021 / 149772A SUMMARY Problems to be Solved

[0004] The pole piece annular unit may be subjected to an excitation force in the radial direction. For example, centrifugal force generated by the rotation of the pole piece rotor or electromagnetic force generated at the pole pieces can be the excitation force. When the excitation force causes at least one of the plurality of non-magnetic bodies to vibrate, a large reaction force acts on an axial end portion of the non-magnetic body, and the non-magnetic body may be damaged. Therefore, it is desirable that the anti-vibration design be reflected in the non-magnetic bodies.

[0005] An object of the present disclosure is to provide a pole piece rotor and a magnetic geared electrical machine that can suppress the vibration of non-magnetic bodies. Solution to the Problems

[0006] A pole piece rotor according to at least one embodiment of the present disclosure is a pole piece rotor installed in a magnetic geared electrical machine, including: an annular body including a plurality of pole pieces and a plurality of non-magnetic bodies arranged alternately in a circumferential direction of the magnetic geared electrical machine; and a connection member including a body portion connecting an end portion of the annular body on one side in an axial direction to a rotational shaft of the magnetic geared electrical machine. The connection member further includes a protruding portion disposed radially inward of the annular body and protruding from the body portion toward the other side in the axial direction. An outer peripheral surface of the protruding portion has a non-magnetic body support surface supporting at least one of the plurality of non-magnetic bodies.

[0007] A machine includes: the above-described pole piece rotor; a rotor including a plurality of rotor magnets disposed radially inward of the annular body of the pole piece rotor and arranged in the circumferential direction; and a stator including a plurality of stator magnets disposed radially outward of the annular body and arranged in the circumferential direction. Advantageous Effects

[0008] The present disclosure provides a pole piece rotor and a magnetic geared electrical machine that can suppress the vibration of non-magnetic bodies. BRIEF DESCRIPTION OF DRAWINGS

[0009] FIG. lisa schematic diagram of a magnetic geared electrical machine according to an embodiment. FIG. 2 is a schematic diagram of a pole piece rotor according to an embodiment. FIG. 3A is a schematic diagram showing an example of the anti-vibration structure according to the first embodiment. FIG. 3B is a schematic diagram showing another example of the anti-vibration structure according to the first embodiment. FIG. 4 is a schematic diagram showing an example of the anti-vibration structure according to the second embodiment. FIG. 5 is a schematic diagram of a pressing ring according to an embodiment. FIG. 6 is a schematic diagram showing an example of the anti-vibration structure according to the third embodiment. DETAILED DESCRIPTION

[0010] Embodiments of the present disclosure will be described below with reference to the accompanying drawings. It is intended, however, that unless particularly identified, dimensions, materials, shapes, relative positions, and the like of components described in the embodiments shall be interpreted as illustrative only and not intended to limit the scope of the present disclosure. For instance, an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function. For instance, an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function. Further, for instance, an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved. On the other hand, an expression such as “comprise”, “include”, “have”, “contain” and “constitute” are not intended to be exclusive of other components. The same configurations are indicated by the same reference signs and may not be described again in detail.

[0011] <1. Overview of magnetic geared electrical machine 1> FIG. 1 is a schematic diagram of a magnetic geared electrical machine 1 according to an embodiment of the present disclosure. The magnetic geared electrical machine 1 includes a rotational shaft 5 connected to an external device 7. In the following description, “circumferential direction” or “circumferentially” refers to the circumferential direction with respect to the axis S of the rotational shaft 5, “axial direction” or “axially” refers to the axial direction of the axis S, and “radial direction” or “radially” refers to the radial direction with respect to the axis S. The term “radially inward” or “radially inner side” indicates the side toward the axis S, and the term “radially outward” or “radially outer side” indicates the side away from the axis S. The axis S coincides with the axis of an annular body 50, which will be described later.

[0012] The magnetic geared electrical machine 1 includes a housing 9 rotatably supporting the rotational shaft 5, and a pole piece rotor 30 connected to the rotational shaft 5 within the housing 9. The pole piece rotor 30 includes an annular body 50 of cylindrical shape extending along the axis S, a connection member 31 connecting a first end portion 51 of the annular body 50 to the rotational shaft 5, and a connection member 32 connecting a second end portion 52 of the annular body 50 to the rotational shaft 5. The first end portion 51 is an end portion of the annular body 50 on one side in the axial direction, and the second end portion 52 is an end portion of the annular body 50 opposite the first end portion 51. The annular body 50 includes a plurality of pole pieces 55 and a plurality of non-magnetic bodies 53 (see FIG. 2) arranged alternately along the circumferential direction. In the example of FIG. 1, the connection members 31 and 32 are each connected to the rotational shaft 5, and the pole piece rotor 30 is configured to rotate integrally with the rotational shaft 5.

[0013] The magnetic geared electrical machine 1 further includes a magnet rotor 15. The magnet rotor 15 includes a plurality of rotor magnets 19 disposed radially inward of the annular body 50 and arranged in the circumferential direction, and a rotor core 16 that supports the rotor magnets 19. The rotor core 16 is fixed to the rotational shaft 5 via a bearing, and the magnet rotor 15 is configured to rotate relative to the rotational shaft 5. The magnet rotor 15 faces the annular body 50 with an inner air gap G1 therebetween in the radial direction. In the example of FIG. 1, the surface permanent magnet (SPM) configuration is used, in which the rotor magnets 19 are provided on the surface of the rotor core 16, but the interior permanent magnet (IPM) configuration may be used, in which the rotor magnets 19 are provided inside the rotor core 16.

[0014] The magnetic geared electrical machine 1 includes a stator 20 supported by the housing 9. The stator 20 includes a plurality of stator magnets 29 disposed radially outward of the annular body 50 and arranged in the circumferential direction, a stator core 25 that supports the stator magnets 29, and a stator coil 27 wound around the stator core 25. The stator coil 27 is electrically connected to an electric power system 6. The stator 20 faces the annular body 50 with an outer air gap G2 therebetween in the radial direction. In the example of FIG. 1, the SPM configuration is used, in which the stator magnets 29 are provided on the surface of the stator core 25, but the IPM configuration may be used, in which the stator magnets 29 are provided inside the stator core 25.

[0015] The magnetic geared electrical machine 1 according to an embodiment is a magnetic geared motor configured to drive the external device 7 upon receiving electric power supplied from the electric power system 6. The operation principle is as follows. The magnet rotor 15 rotates by a rotating magnetic field generated by energization of the stator coil 27. The positional relationship of the annular body 50 relative to the plurality of rotor magnets 19 and the plurality of stator magnets 29 changes in the circumferential direction, the magnetic flux between the magnet rotor 15 and the stator 20 is modulated, and the pole piece rotor 30 rotates. Torque is transmitted from the rotational shaft 5, which rotates together with the pole piece rotor 30, to the external device 7, so that the external device 7 is driven.

[0016] The magnetic geared electrical machine 1 according to another embodiment is a magnetic geared generator. In this case, the pole piece rotor 30 rotates together with the rotational shaft 5 as the external device 7 drives the rotational shaft 5. The positional relationship of the annular body 50 relative to the plurality of rotor magnets 19 and the plurality of stator magnets 29 changes in the circumferential direction, and the magnet rotor 15 rotates. The electromagnetic induction caused by the rotation of the pole piece rotor 30 and the magnet rotor 15 generates a current in the stator coil 27, so that electric power is supplied to the electric power system 6.

[0017] NL = NH + NS holds, where NL is the number of magnetic poles of the pole pieces 55, NH is the number of pairs of magnetic poles (pole pairs) of the rotor magnets 19, and NS is the number of pairs of magnetic poles (pole pairs) of the stator magnets 29. If this relationship holds, the ratio of the number of rotations of the magnet rotor 15 to the pole piece rotor 30 is expressed as NL / NH. In this example, NL / NH is greater than 1, meaning that the magnet rotor 15 functions as a high-speed rotor and the pole piece rotor 30 functions as a low-speed rotor. The number of magnetic poles NL of the pole pieces 55 is smaller than the number of pole pairs NS of the stator magnets 29.

[0018] The magnetic geared electrical machine 1 of the present disclosure is not limited to the above-described embodiments. The external device 7 may be connected to a power transmission shaft (not shown) that is disposed coaxially with the rotational shaft 5. The power transmission shaft and the rotational shaft 5 are uncoupled from each other. In this case, the connection member 31 is connected to the rotational shaft 5 via a bearing, while the connection member 32 is fixed to the power transmission shaft. Further, the rotor core 16 of the magnet rotor 15 is fixed to the rotational shaft 5. This allows the magnet rotor 15 to rotate integrally with the rotational shaft 5 and the pole piece rotor 30 to rotate relative to the rotational shaft 5.

[0019] <2. Detailed configuration of pole piece rotor 30> FIG. 2 is a schematic diagram of the pole piece rotor 30 according to an embodiment of the present disclosure. The pole piece rotor 30 is configured to rotate around the axis S.

[0020] The connection member 31 includes a body portion 35 connecting the first end portion 51 of the annular body 50 to the rotational shaft (see FIG. 1). The body portion 35 has a shaft connecting portion 38 connected to the rotational shaft 5, a ring portion 37 connected to the first end portion 51 of the annular body 50, and a connection portion 39 connected to the ring portion 37 and the shaft connecting portion 38. The shaft connecting portion 38 has a cylindrical shape centered on the axis S, and the ring portion 37 is a plate ring extending in the circumferential direction. The thickness direction of the ring portion 37 coincides with the axial direction. The connection portion 39 extends along the radial direction. In the present embodiment, a plurality of connection portions 39 are arranged at intervals in the circumferential direction. The connection member 32 is symmetrical with the connection member 31 in the axial direction. Although not described in detail, the ring portion 37 of the connection member 32 is connected to the second end portion 52 of the annular body 50. The connection members 31, 32 are preferably formed from, for example, a non-magnetic metal material such as stainless steel. However, the present disclosure is not limited thereto, and the connection members 31, 32 may be formed from a magnetic material. [0021 ] As described above, the annular body 50 includes a plurality of non-magnetic bodies 53 and a plurality of pole pieces 55 arranged alternately along the circumferential direction. The non-magnetic body 53 may be formed from a fiber-reinforced composite material (FRP; Fiber Reinforced Plastics) as an example. The FRP may be, for example, a glass fiber-reinforced plastic (GFRP; Glass Fiber Reinforced Plastics) or a carbon fiber-reinforced plastic (CFRP; Carbon Fiber Reinforced Plastics). Each pole piece 55 may be formed from a plurality of electromagnetic steel sheets laminated in the axial direction, or from one or more powder magnetic cores extending in the axial direction, or from a combination of electromagnetic steel sheets and powder magnetic cores. A pair of insulators 54 is placed on either side of each pole piece 55 in the axial direction, and one pole piece elongated unit is formed by the pair of insulators 54 and the pole piece 55 therebetween. A ring unit, which is the main body of the annular body 50, is formed by a plurality of pole piece elongated units and a plurality of non-magnetic bodies 53 arranged alternately in the circumferential direction.

[0022] Although not an essential component of the present disclosure, the annular body 50 may further include a pair of end rings 56 that sandwich the ring unit in the axial direction. Each end ring 56 extends in the circumferential direction. One of the pair of end rings 56 is connected to an end portion of each pole piece 55 on one side in the axial direction via the insulator 54 and directly to an end portion of each non-magnetic body 53 on one side. Similarly, the other of the pair of end rings 56 is connected to each pole piece 55 and each nonmagnetic body 53. The pair of end rings 56 constitute the first end portion 51 and the second end portion 52 of the annular body 50, respectively. That is, the pair of end rings 56 are connected to the connection members 31 and 32, respectively. The end ring 56 is a plate ring that faces the ring portion 37 of the connection member 31, 32 in the axial direction. The end ring 56 may be formed from a non-magnetic metal material such as stainless steel or may be formed from a non-conductive material such as plastic or rubber.

[0023] The connection structure between the connection members 31, 32 and the annular body 50 illustrated in FIG. 2 will be described. The pole piece rotor 30 includes a fastening shaft 21 extending in the axial direction and a pair or nuts 22. The fastening shaft 21 is inserted into an insertion-through hole 34 in each of the pair of ring portions 37, an end ring hole 59 (see FIG. 3 A) in each of the pair of end rings 56, and a non-magnetic body hole 57 (see FIG. 3A) in the non-magnetic body 53. More specifically, the fastening shaft 21 loosely fits into each of the insertion-through hole 34, the end ring hole 59, and the non-magnetic body hole 57. The pair of nuts 22 is screwed onto the fastening shaft 21 at a position displaced from the annular body 50 in the axial direction and is fastened so as to sandwich the pair of end rings 56 in the axial direction. Thus, the connection members 31,32 are connected to the annular body 50.

[0024] In FIG. 2, only one fastening unit, composed of the fastening shaft 21 and the pair of nuts 22, is shown disassembled for ease of viewing the drawing, but in the present disclosure, a plurality of fastening units may be arranged along the circumferential direction. More specifically, the fastening shaft 21 may be inserted into each of some of the plurality of non magnetic bodies 53. However, the present disclosure is not limited thereto, and the fastening shaft 21 may be inserted into each of all non-magnetic bodies 53. Alternatively, the fastening shaft 21 may be inserted into each of some of the plurality of pole piece elongated units. In this case, insertion-through holes 34 are arranged to be aligned with the pole piece elongated units in the circumferential direction, and through holes are provided in each of the pole pieces 55 and the insulators 54. Furthermore, the present disclosure is not limited to the connection structure between the connection members 31, 32 and the annular body 50 being realized by the fastening shaft 21 and the pair of nuts 22. If the fastening shaft 21 is a bolt, only one of the pair of nuts 22 need be provided. Other connection structures that do not require the fastening shaft 21 will be described below with reference to FIG. 3B.

[0025] In the example of FIG. 2, each non-magnetic body 53 is longer than each pole piece 55 in the axial direction and has the same axial length as the pole piece elongated unit composed of the pole piece 55 and the pair of insulators 54, but the present disclosure is not limited to this configuration. For example, a structure may be employed in which the non-magnetic body 53 and the pole piece 55 have the same axial length as each other.

[0026] <3. Overview of anti-vibration structure of annular body 50> When the pole piece rotor 30 illustrated in FIG. 2 rotates, various excitation forces act on the annular body 50 in the radial direction. For example, centrifugal force acting on the annular body 50 is an example of the excitation force. Electromagnetic force acting on the pole pieces 55 when the magnetic flux is modulated is another example of the excitation force and propagates to the non-magnetic bodies 53. When such an excitation force is generated, the non-magnetic bodies 53 may bend, and the axial end portions of the non-magnetic bodies 53 may be damaged due to the concentrated load. The radial lengths of the inner air gap G1 and the outer air gap G2 described with reference to FIG. 1 are generally not more than a few mm or not more than 1 mm. Therefore, if the non-magnetic bodies 53 or the pole pieces 55 bend in the radial direction due to the excitation force, the annular body 50 may undesirably come into contact with the stator 20 or the magnet rotor 15. Such contact can also occur when the excitation force causes the annular body 50 to resonate. Therefore, in order to solve the above technical problems, the present inventors have come up with the anti-vibration structure of the annular body 50. The anti-vibration structure for the first, second, and third embodiments will be sequentially described in detail below.

[0027] <4. Details of anti-vibration structure according to first embodiment FIG. 3A shows an example of the anti-vibration structure according to the first embodiment, and FIG. 3B shows another example.

[0028] <4-1. Basic configuration of anti-vibration structure> The connection member 31 A, 3 IB (31) of the pole piece rotor 30A, 30B (30) shown in FIGs. 3 A and 3B further includes a protruding portion 60A, 60B (60) located radially inward of the annular body 50. The protruding portion 60 A, 60B protrudes from the ring portion 37 of the body portion 3 5 A, 35B (35) toward the other side in the axial direction. The protruding portion 60A, 60B is ring-shaped extending in the circumferential direction and directly supports the annular body 50 from the radially inner side over the entire circumferential length thereof.

[0029] An outer peripheral surface 68A, 68B (68) of the protruding portion 60A, 60B includes a non-magnetic body support surface 62A, 62B (62) that supports at least one of the plurality of non-magnetic bodies 53 and an end ring support surface 63 A, 63B (63) that supports the end ring 56. The end ring support surface 63 is located on one side in the axial direction relative to the non-magnetic body support surface 62. In the first embodiment, both the nonmagnetic body support surface 62 and the end ring support surface 63 are formed on the outer peripheral surface 68 of the protruding portion 60. In the first embodiment, the non-magnetic body support surface 62 directly supports each of the plurality of non-magnetic bodies 53. On the other hand, the end ring support surface 63 may directly or indirectly support the end ring 56.

[0030] With the above configuration, the non-magnetic body support surface 62 directly supports at least one non-magnetic body 53. This shortens the axial length of the portion of the non-magnetic body 53 that bends in the radial direction due to the excitation force. Accordingly, the vibration of the non-magnetic body 53 in the radial direction is suppressed during the rotation of the pole piece rotor 30. Additionally, since the protruding portion 60 protrudes from the body portion 35, which has relatively strong rigidity in the radial direction, and the non-magnetic body 53 is supported by the protruding portion 60, the natural frequency of the annular body 50 is increased, and the resonance of the annular body 50 including the non-magnetic body 53 is suppressed. From the above, it is possible to achieve a pole piece rotor 30 that can suppress the vibration of non-magnetic bodies 53.

[0031] Additionally, since the end ring 56 connected to the end portions of the nonmagnetic bodies 53 is also supported from the radially inner side, the rigidity of the nonmagnetic bodies 53 in the radial direction is increased, and the vibration of the non-magnetic bodies 53 is suppressed. Furthermore, since both the non-magnetic body support surface 62 and the end ring 56 support surface are located on the outer peripheral surface 68 of the protruding portion 60, the structure of the connection member 31 can be simplified.

[0032] <4-2. Additional configuration of anti-vibration structure> The pole piece rotor 30A (30) illustrated in FIG. 3A further includes the above-described fastening shaft 21 and the pair of nuts 22. The details of these configurations are as described above. With the above configuration, since the fastening shaft 21 is inserted into the nonmagnetic body 53, the vibration of the non-magnetic body 53 in the radial direction is suppressed.

[0033] The pole piece rotor 30B (30) illustrated in FIG. 3B further includes a contact plate 70 in contact with an outer peripheral surface 151 of the annular body 50, and a plate fastening member 75 serving to press the contact plate 70 against the outer peripheral surface 151. The contact plate 70 is a plate with thickness in the radial direction disposed so as to overlap with at least the protruding portion 60 in the axial direction. The contact plate 70 in this example is a single ring plate extending in the circumferential direction. As another example, a ring plate may be formed by a plurality of contact plates 70 arranged along the circumferential direction. In both examples, the ring plate is in contact with the outer peripheral surface 151 over the entire circumferential length of the annular body 50. The contact plate 70 is formed from, for example, a non-magnetic metal material such as stainless steel.

[0034] The contact plate 70 is pressed against the outer peripheral surface 151 of the annular body 50 by the plate fastening member 75, which is a component of the pole piece rotor 30B. The plate fastening member 75 includes an inserted shaft portion 76. The inserted shaft portion 76 is inserted into a plate shaft hole 71 that passes through the contact plate 70 in the radial direction, an end ring shaft hole 58 that passes through the end ring 56 in the radial direction, and a protrusion hole 73 in the protruding portion 60. The plate fastening member 75 in the example of FIG. 3B is a screw, with the inserted shaft portion 76 screwed onto the female thread formed in the protrusion hole 73, and a head portion 79 of the plate fastening member 75 presses the contact plate 70 against the outer peripheral surface 151. In another example, the plate fastening member 75 may be a bolt. In this case, the protrusion hole 73 is a through hole that passes through the protruding portion 60 in the radial direction, and a fastening nut (not shown) is screwed onto the inserted shaft portion 76 that protrudes radially inward from the protruding portion 60.

[0035] With the above configuration, since the non-magnetic body 53 is interposed between the contact plate 70 and the protruding portion 60, the end portion of the non-magnetic body 53 in the axial direction can be fixed more firmly. This shortens the axial length of the portion of the non-magnetic body 53 that bends in the radial direction due to the excitation force, suppressing the vibration of the non-magnetic body 53.

[0036] As illustrated in FIG. 3B, the contact plate 70 may be in contact with both the end ring 56 and the non-magnetic body 53. With the above configuration, since the contact plate 70 presses both the end ring 56 and the non-magnetic body 53 from the radially outer side, the end portion of the non-magnetic body 53 is prevented from breaking and separating from the end ring 56 due to the generation of excitation force.

[0037] The pole piece rotor 30B illustrated in FIG. 3B may further include an outer cover 91 disposed on the outer peripheral surface 151 of the annular body 50. The outer cover 91 is cylindrical and disposed on the outer peripheral surface 151 over the entire circumferential length of the annular body 50, and may be in indirect contact with the outer peripheral surface 151 via an adhesive layer (not shown) or may be in direct contact with the outer peripheral surface 151. The outer cover 91 is formed from, for example, CFRP. The contact plate 70 is located on one side in the axial direction relative to the outer cover 91. Generally, the radial length of the outer air gap G2 formed between the annular body 50 and the stator 20 should be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration, the contact plate 70 is restrained from entering the outer air gap G2. This prevents the contact plate 70 from colliding with other parts such as the stator 20 during the rotation of the pole piece rotor 30. Furthermore, since the contact plate 70, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap G2, the contact plate 70 does not obstruct the flow of magnetic flux formed in the outer air gap G2, and the magnetic geared electrical machine 1 can operate normally.

[0038] The pole piece rotor 30B may further include the fastening shaft 21 and the pair of nuts 22 as shown in FIG. 2. In this case, the end ring shaft hole 58 should be provided in a circumferential position away from the fastening shaft 21, and the plate shaft hole 71 and the protrusion hole 73 should be provided to face the end ring shaft hole 58 in the radial direction.

[0039] <4-3. Other additional configuration of anti-vibration structure> As illustrated in FIGs. 3 A and 3B, the pole piece rotor 30A, 30B may further include an inner cover 92 disposed on an inner peripheral surface 152 of the annular body 50. The inner cover 92 is cylindrical and disposed on the inner peripheral surface 152 over the entire circumferential length of the annular body 50, and may be in indirect contact with the inner peripheral surface 152 via an adhesive layer (not shown) or may be in direct contact with the inner peripheral surface 152. The inner cover 92 is formed from, for example, CFRP.

[0040] The protruding portion 60A, 60B (60) is located on one side in the axial direction relative to the inner cover 92. The radial length of the inner air gap G1 formed between the annular body 50 and the pole piece rotor 30 should generally be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration, the amount of protrusion of the protruding portion 60 from the body portion 35 is reduced, so that the protruding portion 60 is restrained from entering the inner air gap Gl. This prevents the protruding portion 60 from colliding with other parts such as the magnet rotor 15 during the rotation of the pole piece rotor 30. Furthermore, since the protruding portion 60, which may be made of, for example, a non-magnetic metal material, is restrained from entering the inner air gap Gl, the protruding portion 60 does not obstruct the flow of magnetic flux formed in the inner air gap Gl, and the magnetic geared electrical machine 1 can operate normally.

[0041] As described above, each non-magnetic body 53 is longer than each pole piece 55 in the axial direction (see FIG. 2). Non-magnetic bodies 53 that are longer than the pole pieces 55 are disadvantageous in terms of rigidity in the radial direction. In this regard, with the above configuration, since the protruding portion 60 supports the non-magnetic body 53 elongated in the axial direction, the vibration of the non-magnetic body 53 in the radial direction is suppressed.

[0042] In FIGs. 3A and 3B, the axial position where the end of each pole piece 55 on one side in the axial direction is located is shown by the dashed double-dotted line L. As shown in these figures, each pole piece 55 is disposed on the other side relative to the end portion of the non-magnetic body 53 on one side in the axial direction. Further, the protruding portion 60A, 60B (60) is located on one side in the axial direction relative to each pole piece 55. With the above configuration, the amount of protrusion of the protruding portion 60 from the body portion 35 is reduced, so even when the excitation force is transmitted to the protruding portion 60, deformation of the protruding portion 60 can be suppressed, and thus deformation of the annular body 50 can be suppressed.

[0043] <5. Details of anti-vibration structure according to second embodiment FIG. 4 is a schematic diagram showing an example of the anti-vibration structure according to the second embodiment.

[0044] <5-1. Basic configuration of anti-vibration structure> The connection member 3 IC (31) of the pole piece rotor 30C (30) shown in FIG. 4 further includes a protruding portion 60C (60) located radially inward of the annular body 50. The protruding portion 60C protrudes from the ring portion 37 of the body portion 35C (35) toward the other side in the axial direction. The protruding portion 60C is ring-shaped extending in the circumferential direction and supports the annular body 50 from the radially inner side over the entire circumferential length thereof.

[0045] The outer peripheral surface 68C (68) of the protruding portion 60C includes a nonmagnetic body support surface 62C (62) that supports at least one of the plurality of nonmagnetic bodies 53. In the second embodiment illustrated in FIG. 4, the non-magnetic body support surface 62C indirectly supports the end portion of each of the plurality of non-magnetic bodies 53 and each of the plurality of insulators 54 (see FIG. 2) via a wedge unit 100. The configuration of the wedge unit 100 will be described in detail later. On the other hand, the end ring support surface 63 directly supports the end ring 56.

[0046] With the above configuration, since the non-magnetic body support surface 62 indirectly supports at least one non-magnetic body 53, the vibration of the non-magnetic body 53 in the radial direction is suppressed during the rotation of the pole piece rotor 30 for the reasons explained in the first embodiment. Additionally, since the protruding portion 60 protrudes from the body portion 35, which has relatively strong rigidity in the radial direction, the resonance of the annular body 50 including the non-magnetic body 53 is suppressed for the reasons explained in the first embodiment. From the above, it is possible to achieve a pole piece rotor 30 that can suppress the vibration of non-magnetic bodies 53.

[0047] <5-2. Additional configuration of anti-vibration structure> The body portion 35C (35) of the pole piece rotor 30C (30) illustrated in FIG. 4 further includes a step portion 66 formed radially inward of the annular body 50 and radially outward of the protruding portion 60C. The step portion 66 protrudes further toward the other side in the axial direction than the ring portion 37 and is located on one side in the axial direction relative to the protruding portion 60C. An outer peripheral surface 65 of the step portion 66 has an end ring support surface 63C (63). The step portion 66 is ring-shaped extending in the circumferential direction and supports the end ring 56 over the entire circumferential length thereof. With the above configuration, since the step portion 66, which is different from the protruding portion 60, serves a function to support the end ring 56, the axial position of the protruding portion 60 can be flexibly adjusted at the design stage.

[0048] <5-3. Wedge unit 100> The wedge unit 100 illustrated in FIG. 4 is fixed by a fastening member 80, which is a component of the pole piece rotor 30C. The detailed configuration will be described below.

[0049] The wedge unit 100 includes an inner wedge 110 disposed on the non-magnetic body support surface 62C and an outer wedge 120 disposed between the inner wedge 110 and the non-magnetic body 53. The outer peripheral surface of the inner wedge 110 is an inclined outer peripheral surface 115 that is inclined in a straight line radially inward toward one side in the axial direction. Further, the inner wedge 110 has an insertion hole 119 penetrating in the axial direction. The inner peripheral surface of the outer wedge 120 is an inclined inner peripheral surface 122 that is parallel to the inclined outer peripheral surface 115 and comes into direct contact with the inclined outer peripheral surface 115. The outer wedge 120 is disposed so as to overlap with the non-magnetic body 53 and the end ring 56 in the axial direction.

[0050] The fastening member 80 includes a shaft portion 88 extending in the axial direction. The shaft portion 88 is inserted into a through hole 135 that passes through the body portion 35C (35) in the axial direction and into the above-described insertion hole 119 in the inner wedge 110. In this example, the shaft portion 88 is screwed onto the female thread formed inside the insertion hole 119. The force with which the inclined outer peripheral surface 115 presses the inclined inner peripheral surface 122 due to the axial force of the fastening member 80 in a fastened state consists of a force component P directed toward one side in the axial direction and a force component Q directed outward in the radial direction. The force component Q causes the outer wedge 120 to press the non-magnetic body 53 radially outward.

[0051] With the above configuration, since the inner wedge 110 presses the outer wedge 120 against the non-magnetic body 53 by fastening with the fastening member 80, the connection between the protruding portion 60 and the non-magnetic body 53 is strengthened, and the rigidity of the non-magnetic body 53 in the radial direction is improved. Thus, it is possible to suppress the vibration of the non-magnetic body 53. In another embodiment, a fastening nut (not shown) may be screwed onto the fastening member 80. In this case, the fastening nut is screwed onto the shaft portion 88 that protrudes from the insertion hole 119 toward the other side in the axial direction. The fastening nut pushes the inner wedge 110 to one side, resulting in a force component Q. Alternatively, a configuration may be adopted in which the fastening member 80 is a screw shaft and a fastening nut is screwed onto the screw shaft from one side in the axial direction. In this case, the screw shaft is press-fitted into the insertion hole 119.

[0052] In some embodiments, the inner wedge 110 may face the body portion 35C (35) with a gap K in the axial direction. With the above configuration, since the inner wedge 110 maintains its distance from the body portion 35 when fastened with the fastening member 80, the axial force of the fastening member 80 easily propagates to the outer wedge 120 as a pressing force from the inner wedge 110. Consequently, the connection between the protruding portion 60 and the non-magnetic body 53 is strengthened.

[0053] In some embodiments, the end ring 56 includes an end ring inner peripheral surface 156 that faces an outer peripheral surface 129 of the outer wedge 120 with a gap M in the radial direction. More specifically, part of the end ring inner peripheral surface 156 is recessed outward in the radial direction, and the recessed end ring inner peripheral surface 156 faces the outer peripheral surface 129 of the outer wedge 120.

[0054] With the above configuration, the pressing force from the inner wedge 110 to the outer wedge 120 is prevented from propagating to the end ring 56, so that the connection between the protruding portion 60 and the non-magnetic body 53 is strengthened. In another embodiment, the end ring inner peripheral surface 156 does not have to be recessed outward in the radial direction. Instead, part of the outer peripheral surface 129 may be recessed inward in the radial direction. Even in this case, the end ring inner peripheral surface 156 faces the outer peripheral surface 129 with a gap M, providing the above-described advantages.

[0055] In some embodiments, the body portion 35C includes a one-side end surface 33 that is an end surface on one side in the axial direction. The one-side end surface 33 has an inclined surface 3 disposed radially inward of the fastening member 80. The inclined surface 3 extends toward the other side in the axial direction as it goes radially inward. The inclined surface 3 may be curved as shown in FIG. 4, or it may be straight (not shown).

[0056] When the excitation force is transmitted to the body portion 35 via at least one of the inner wedge 110, the outer wedge 120, or the fastening member 80, the body portion 35 is pushed to one side in the axial direction on the radially inner side of the fastening member 80 (Arrow R). In this regard, with the above configuration, the inclined surface 3 of the connection member 31 suppresses the stress concentration at the one-side end surface 33 and prevents damage to the connection member 31.

[0057] <5-4. Pressing ring 160> In some embodiments, the pole piece rotor 30C (30) may further include a pressing ring 160 extending in the circumferential direction on the outer peripheral surface 151 of the annular body 50. The pressing ring 160, which may be made of, for example, a non-magnetic metal material, presses the annular body 50 radially inward. In the example of FIG. 4, the pressing ring 160 includes a first overlapping portion 161 that overlaps with the protruding portion 60C in the axial direction and a second overlapping portion 162 that overlaps with the end ring 56 in the axial direction.

[0058] With the configuration in which the pressing ring 160 includes the first overlapping portion 161, since the non-magnetic body 53 is interposed between the first overlapping portion 161 and the protruding portion 60, the end portion of the non-magnetic body 53 in the axial direction can be fixed more firmly. This shortens the axial length of the portion of the nonmagnetic body 53 that bends in the radial direction due to the excitation force, suppressing the vibration of the non-magnetic body 53.

[0059] With the configuration in which the pressing ring 160 includes the first overlapping portion 161 and the second overlapping portion 162, since the pressing ring 160 presses both the end ring 56 and the non-magnetic body 53 from the radially outer side, the end ring 56 and the non-magnetic body 53 are prevented from separating due to the generation of excitation force.

[0060] In some embodiments, the pole piece rotor 30C may further include an outer cover 91 disposed on the outer peripheral surface 151 of the annular body 50. The details of the outer cover 91 are as described in the first embodiment. In the example of FIG. 4, the pressing ring 160 is located on the other side in the axial direction relative to the outer cover 91. The radial length of the outer air gap G2 formed between the annular body 50 and the stator 20 should generally be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration, the pressing ring 160 is restrained from entering the outer air gap G2. This prevents the pressing ring 160 from colliding with other parts such as the stator 20 during the rotation of the pole piece rotor 30. Furthermore, since the pressing ring 160, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap G2, the pressing ring 160 does not obstruct the flow of magnetic flux formed in the outer air gap G2, and the magnetic geared electrical machine 1 can operate normally.

[0061] FIG. 5 is a schematic diagram of the pressing ring 160 according to an embodiment of the present disclosure. As shown in this figure, the pressing ring 160 is C-ring shaped in the axial view. In other words, the pressing ring 160 includes a ring first end portion 157 that is one end portion in the circumferential direction, and a ring second end portion 158 that is the other end portion in the circumferential direction. The ring second end portion 158 faces the ring first end portion 157 with a gap H therebetween. With the above configuration, in the assembly process of the pole piece rotor 30, the pressing ring 160 which has been deformed so that the gap H widens in the circumferential direction can be attached to the annular body 50, facilitating the process of attaching the pressing ring 160. This improves the assembly of the pole piece rotor 30.

[0062] <5-5. Other configurations> At least one of the configurations described in the first embodiment may be applied to the pole piece rotor 30C (30). For example, at least one of the configurations (Al) through (A4) below may be applied to the pole piece rotor 30C. The advantages associated with its application have already been described above and thus are not discussed in detail. (Al) Configuration in which the pole piece rotor 30 is equipped with the fastening shaft 21. (A2) Configuration in which the protruding portion 60 is located on one side in the axial direction relative to the inner cover 92. (A3) Configuration in which each non-magnetic body 53 is longer than each pole piece 55 in the axial direction. (A4) Configuration in which the protruding portion 60 is located on one side in the axial direction relative to each pole piece 55. <6. Details of anti-vibration structure according to third embodiment FIG. 6 is a schematic diagram showing an example of the anti-vibration structure according to the third embodiment.

[0063] <6-1. Basic configuration of anti-vibration structure> The connection member 3 ID (31) of the pole piece rotor 30D (30) shown in FIG. 6 further includes a protruding portion 60D (60) located radially inward of the annular body 50. The protruding portion 60D protrudes from the ring portion 37 of the body portion 35D (35) toward the other side in the axial direction. The protruding portion 60D is ring-shaped extending in the circumferential direction and supports the annular body 50 from the radially inner side over the entire circumferential length thereof.

[0064] The outer peripheral surface 68D (68) of the protruding portion 60C includes a nonmagnetic body support surface 62D (62) that supports at least one of the plurality of nonmagnetic bodies 53. The non-magnetic body support surface 62D is inclined in a straight line radially inward toward the other side in the axial direction. In the third embodiment, the nonmagnetic body support surface 62D supports the non-magnetic body 53 through functioning as the end ring support surface 63D (63) that supports the end ring 56D (56). In other words, in the third embodiment, the non-magnetic body support surface 62D (62) also serves as the end ring support surface 63D (63). The detailed configuration will be described below.

[0065] The pole piece rotor 30D includes an intervening member 95 interposed between the end ring support surface 63D and the end ring 56D (56), the above-described fastening shaft 21, and the above-described pair of nuts 22. The intervening member 95 is ring-shaped extending in the circumferential direction. The intervening member 95 may be formed from a non-magnetic metal material or may be formed from an elastic material such as rubber. The configuration of the fastening shaft 21 and the nuts 22 is as previously described.

[0066] The connection member 3 ID (31) shown in FIG. 6 is pressed toward the other side in the axial direction by the nut 22 fastened to the fastening shaft 21, and the inclined nonmagnetic body support surface 62D presses the end ring 56. The force with which the nonmagnetic body support surface 62D presses the end ring 56 consists of a force component W1 directed toward the other side in the axial direction and a force component W2 directed outward in the radial direction. With the force component W2, the fastening shaft 21 inserted into the end ring 56D is pressed radially outward and comes into contact with the non-magnetic body 53. That is, the fastening shaft 21, which loosely fits into the non-magnetic body hole 57, comes into contact with the non-magnetic body 53 from the radially inner side. The end ring support surface 63D (64) supports the end ring 56D via the intervening member 95 and supports the non-magnetic body 53 via the end ring 56D (56) and the fastening shaft 21. Therefore, the end ring support surface 63D (63) functions as the non-magnetic body support surface 62D (62).

[0067] With the above configuration, since the non-magnetic body support surface 62 indirectly supports at least one non-magnetic body 53 via the intervening member 95, the end ring 56, and the fastening shaft 21, the vibration of the non-magnetic body 53 in the radial direction is suppressed during the rotation of the pole piece rotor 30 for the reasons explained in the first embodiment. Additionally, since the protruding portion 60 protrudes from the body portion 35, which has relatively strong rigidity in the radial direction, the resonance of the annular body 50 including the non-magnetic body 53 is suppressed for the reasons explained in the first embodiment. From the above, it is possible to achieve a pole piece rotor 30 that can suppress the vibration of non-magnetic bodies 53. Additionally, since the fastening shaft 21 comes into contact with the non-magnetic body 53, the rigidity of the non-magnetic body 53 in the radial direction is increased, and the vibration of the non-magnetic body 53 is suppressed.

[0068] <6-2. Additional configuration of anti-vibration structure> In some embodiments, the end ring 56D (56) may further include an end ring body portion 561 extending in the circumferential direction, and a ring projection 566 disposed on the other side in the axial direction relative to the intervening member 95 and protruding radially inward from the end ring body portion 561. The ring projection 566 is in contact with the intervening member 95 from the other side in the axial direction. With the above configuration, the pressing force is easily propagated from the non-magnetic body support surface 62 (i.e., end ring support surface 63) to the end ring 56 via the intervening member 95. Therefore, the fastening shaft 21 can be pressed against the non-magnetic body 53 from the radially inner side more reliably.

[0069] In some embodiments, the intervening member 95 may include an intervening inclined surface 99 inclined radially inward in a straight line toward the other side in the axial direction. The intervening inclined surface 99 is the inner peripheral surface of the intervening member 95 in contact with the non-magnetic body support surface 62D (i.e., end ring support surface 63D). With the above configuration, the non-magnetic body support surface 62 and the intervening inclined surface 99 are in contact with each other, which facilitates propagation of the pressing force from the non-magnetic body support surface 62 to the intervening member 95 and further securely presses the fastening shaft 21 against the non-magnetic body 53 from the radially inner side.

[0070] In some embodiments, the connection member 3 ID (31) may further include a clamping projecting portion 599 protruding from the body portion 35D (35) toward the other side in the axial direction and configured to work with the protruding portion 60D (60) to clamp the intervening member 95 and the end ring 56D. The clamping projecting portion 599 is ring-shaped, extending in the circumferential direction on the radially outer side of the end ring 56 and is integrally formed with the body portion 35D. In some embodiments, an end portion of the clamping projecting portion 599 on the other side in the axial direction may be located on the other side in the axial direction relative to the end ring 56D, and the clamping projecting portion 599 may be in contact with the non-magnetic body 53 from the radially outer side. In other words, the clamping projecting portion 599 may support the non-magnetic body 53 from the radially outer side.

[0071] With the above configuration, the clamping projecting portion 599 clamps the end ring 56 in the radial direction, so that the force propagating from the fastening shaft 21 to the non-magnetic body 53 is less likely to be dispersed, and the fastening shaft 21 comes into more direct contact with the non-magnetic body 53. As a result, the rigidity of the non-magnetic body 53 in the radial direction is further improved, and the vibration of the non-magnetic body 53 is suppressed. If the configuration in which the clamping projecting portion 599 supports the non-magnetic body 53 from the radially outer side is further employed, the axial length of the non-magnetic body 53 that can bend in the radial direction is shortened, and the vibration of the non-magnetic body 53 is further suppressed.

[0072] In some embodiments, the pole piece rotor 30D (30) further includes the abovedescribed outer cover 91, and the clamping projecting portion 599 is located on one side in the axial direction relative to the outer cover 91. Generally, the radial length of the outer air gap G2 formed between the annular body 50 and the stator 20 should be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration, the clamping projecting portion 599 is restrained from entering the outer air gap G2. This prevents the clamping projecting portion 599 from colliding with other parts such as the stator 20 during the rotation of the pole piece rotor 30. Furthermore, since the clamping projecting portion 599, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap G2, the clamping projecting portion 599 does not obstruct the flow of magnetic flux formed in the outer air gap G2, and the magnetic geared electrical machine 1 can operate normally.

[0073] <6-3. Other configurations> At least one of the configurations described in the first embodiment and / or the second embodiment may be applied to the pole piece rotor 30D (30). For example, at least one of the configurations (Bl) through (B5) below may be applied to the pole piece rotor 30C. The advantages associated with its application have already been described above and thus are not discussed in detail. (Bl) Configuration in which the protruding portion 60 is located on one side in the axial direction relative to the inner cover 92. (B2) Configuration in which each non-magnetic body 53 is longer than each pole piece 55 in the axial direction. (B3) Configuration in which the protruding portion 60 is located on one side in the axial direction relative to each pole piece 55. (B4) Configuration in which the pole piece rotor 30 is equipped with the pressing ring 160. (B5) Configuration in which the pole piece rotor 30 is equipped with the contact plate 70 and the plate fastening member 75. For example, in embodiments where the configuration (B4) or (B5) is applied to the pole piece rotor 30D, the clamping projecting portion 599 may not be provided.

[0074] <7. Conclusion> The contents described in some embodiments described above would be understood as follows, for instance.

[0075] 1) A pole piece rotor (30) according to at least one embodiment of the present disclosure is a pole piece rotor (30) installed in a magnetic geared electrical machine (1), including: an annular body (50) including a plurality of pole pieces (55) and a plurality of nonmagnetic bodies (53) arranged alternately in a circumferential direction of the magnetic geared electrical machine; and a connection member (31) including a body portion (37) connecting an end portion (first end portion 51) of the annular body on one side in an axial direction to a rotational shaft (5) of the magnetic geared electrical machine. The connection member further includes a protruding portion (60) disposed radially inward of the annular body and protruding from the body portion toward the other side in the axial direction. An outer peripheral surface (68) of the protruding portion has a non-magnetic body support surface (62) that supports at least one of the plurality of non-magnetic bodies.

[0076] With the above configuration 1), the non-magnetic body support surface directly or indirectly supports at least one non-magnetic body. This shortens the axial length of the portion of the non-magnetic body that bends in the radial direction due to the excitation force. Accordingly, the vibration of the non-magnetic body in the radial direction is suppressed during the rotation of the pole piece rotor. Additionally, since the protruding portion protrudes from the body portion, which has relatively strong rigidity in the radial direction, and the nonmagnetic body is supported by the protruding portion, the natural frequency of the annular body is increased, and the resonance of the annular body including the non-magnetic body is suppressed. From the above, it is possible to achieve a pole piece rotor that can suppress the vibration of non-magnetic bodies.

[0077] 2) In some embodiments, in the pole piece rotor as defined in the above 1), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The outer peripheral surface of the protruding portion further has an end ring support surface (63) that supports the end ring, the end ring support surface being located on the one side in the axial direction relative to the non-magnetic body support surface.

[0078] With the above configuration 2), since the end ring connected to the end portions of the non-magnetic bodies is also supported from the radially inner side, the rigidity of the nonmagnetic bodies in the radial direction is increased, and the vibration of the non-magnetic bodies is suppressed. Additionally, since both the non-magnetic body support surface and the end ring support surface are located on the outer peripheral surface of the protruding portion, the structure of the connection member can be simplified.

[0079] 3) In some embodiments, in the pole piece rotor as defined in the above 1), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The body portion further includes a step portion (66) formed radially inward of the annular body and radially outward of the protruding portion. An outer peripheral surface (65) of the step portion further has an end ring support surface (63) that supports the end ring, the end ring support surface being formed on the one side in the axial direction relative to the non-magnetic body support surface.

[0080] With the above configuration 3), since the step portion, which is different from the protruding portion, serves a function to support the end ring, the axial position of the protruding portion can be flexibly adjusted at the design stage.

[0081] 4) In some embodiments, in the pole piece rotor as defined in the above 3), the pole piece rotor further includes: an inner wedge (110) disposed on the non-magnetic body support surface and including an inclined outer peripheral surface (115) that is an outer peripheral surface inclined radially inward toward the one side in the axial direction; an outer wedge (120) disposed between the inner wedge and the non-magnetic body and including an inclined inner peripheral surface (122) that is an inner peripheral surface in contact with the inclined outer peripheral surface; and a fastening member (80) including a shaft portion (88) inserted into a through hole (135) that passes through the body portion in the axial direction and inserted into an insertion hole (119) formed in the inner wedge, the fastening member serving to press the inclined outer peripheral surface against the inclined inner peripheral surface.

[0082] With the above configuration 4), since the inner wedge presses the outer wedge against the non-magnetic body by fastening with the fastening member, the connection between the protruding portion and the non-magnetic body is strengthened, and the rigidity of the nonmagnetic body in the radial direction is improved. Thus, it is possible to suppress the vibration of the non-magnetic body.

[0083] 5) In some embodiments, in the pole piece rotor as defined in the above 4), the body portion includes a one-side end surface (33) that is an end surface on the one side in the axial direction. The one-side end surface has an inclined surface (3) disposed radially inward of the fastening member and extending toward the other side in the axial direction as it goes radially inward.

[0084] When the excitation force is transmitted to the body portion via at least one of the inner wedge, the outer wedge, or the fastening member, the body portion is pushed to one side in the axial direction on the radially inner side of the fastening member. In this regard, with the above configuration 5), the inclined surface of the connection member suppresses the stress concentration at the one-side end surface and prevents damage to the connection member.

[0085] 6) In some embodiments, in the pole piece rotor as defined in the above 5), the inner wedge faces the body portion with a gap (K) in the axial direction.

[0086] With the above configuration 6), since the inner wedge maintains its distance from the body portion when fastened with the fastening member, the axial force of the fastening member easily propagates to the outer wedge as a pressing force from the inner wedge. Thus, the connection between the protruding portion and the non-magnetic body is strengthened.

[0087] 7) In some embodiments, in the pole piece rotor as defined in any one of the above 4) to 6), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The end ring includes an end ring inner peripheral surface (156) that faces an outer peripheral surface (129) of the outer wedge with a gap (M) in the radial direction.

[0088] With the above configuration 7), the pressing force from the inner wedge to the outer wedge is prevented from propagating to the end ring, so that the connection between the protruding portion and the non-magnetic body is strengthened.

[0089] 8) In some embodiments, in the pole piece rotor as defined in the above 1), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The outer peripheral surface of the protruding portion includes an end ring support surface (63) that supports the end ring, the end ring support surface being inclined radially inward toward the other side in the axial direction. The pole piece rotor includes: an intervening member (95) interposed between the end ring support surface and the end ring; a fastening shaft (21) extending in the axial direction and inserted into an insertion-through hole (34) in the body portion, an end ring hole (159) in the end ring, and a non-magnetic body hole (57) in the non-magnetic body; and a nut (22) screwed onto the fastening shaft at a position offset in the axial direction from the annular body. The non-magnetic body support surface is the end ring support surface.

[0090] With the above configuration 8), the nut fastened to the fastening shaft presses the body portion toward the other side in the axial direction, and the inclined non-magnetic body support surface presses the end ring toward the other side in the axial direction and outward in the radial direction. Accordingly, the fastening shaft inserted into the end ring is pressed radially outward and conies into contact with the non-magnetic body. That is, the nonmagnetic body support surface can support the non-magnetic body via the intervening member, the end ring, and the fastening shaft. As a result, the rigidity of the non-magnetic body in the radial direction is increased, and the vibration of the non-magnetic body is suppressed.

[0091] 9) In some embodiments, in the pole piece rotor as defined in the above 8), the end ring further includes: an end ring body portion (561) extending in the circumferential direction; and a ring projection (566) disposed on the other side in the axial direction relative to the intervening member and protruding from the end ring body portion radially inward, the ring projection being in contact with the intervening member.

[0092] With the above configuration 9), the end ring contacts the intervening member from the other side in the axial direction as well, so that the pressing force is easily propagated from the non-magnetic body support surface to the end ring via the intervening member. Therefore, the fastening shaft can be pressed against the non-magnetic body from the radially inner side more reliably.

[0093] 10) In some embodiments, in the pole piece rotor as defined in the above 8) or 9), the intervening member includes an intervening inclined surface (99) inclined radially inward toward the other side in the axial direction, the intervening inclined surface being in contact with the non-magnetic body support surface.

[0094] With the above configuration 10), the non-magnetic body support surface and the intervening inclined surface are in contact with each other, which facilitates propagation of the pressing force from the non-magnetic body support surface to the intervening member and further securely presses the fastening shaft against the non-magnetic body from the radially inner side.

[0095] 11) In some embodiments, in the pole piece rotor as defined in any one of the above 8) to 10), the connection member further includes a clamping projecting portion (599) protruding from the body portion toward the other side in the axial direction and configured to work with the protruding portion to clamp the intervening member and the end ring.

[0096] With the above configuration 11), the clamping projecting portion clamps the end ring in the radial direction, so that the force propagating from the fastening shaft to the nonmagnetic body is less likely to be dispersed, and the fastening shaft comes into more direct contact with the non-magnetic body. As a result, the rigidity of the non-magnetic body in the radial direction is further improved, and the vibration of the non-magnetic body is suppressed.

[0097] 12) In some embodiments, in the pole piece rotor as defined in the above 11), the pole piece rotor further includes an outer cover (91) disposed on an outer peripheral surface of the annular body. The clamping projecting portion is disposed on the one side in the axial direction relative to the outer cover.

[0098] The radial length of the outer air gap formed between the annular body and the stator should generally be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration 12), the clamping projecting portion is restrained from entering the outer air gap. This prevents the clamping projecting portion from colliding with other parts such as the stator during the rotation of the pole piece rotor. Furthermore, since the clamping projecting portion, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap, the clamping projecting portion does not obstruct the flow of magnetic flux formed in the outer air gap, and the magnetic geared electrical machine can operate normally.

[0099] 13) In some embodiments, in the pole piece rotor as defined in any one of the above 1) to 12), the pole piece rotor further includes an inner cover (92) disposed on an inner peripheral surface of the annular body. The protruding portion is disposed on the one side in the axial direction relative to the inner cover.

[0100] The radial length of the inner air gap formed between the annular body and the pole piece rotor should generally be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration 13), the amount of protrusion of the protruding portion from the body portion is reduced, so that the protruding portion is restrained from entering the inner air gap. This prevents the protruding portion from colliding with other parts such as the magnet rotor during the rotation of the pole piece rotor. Furthermore, since the protruding portion, which may be made of, for example, a non-magnetic metal material, is restrained from entering the inner air gap, the protruding portion does not obstruct the flow of magnetic flux formed in the inner air gap, and the magnetic geared electrical machine can operate normally.

[0101] 14) In some embodiments, in the pole piece rotor as defined in any one of the above 1) to 13), the pole piece rotor further includes a pressing ring (160) extending in the circumferential direction on an outer peripheral surface (151) of the annular body and configured to press the annular body radially inward, the pressing ring including a first overlapping portion (161) that overlaps with the protruding portion in the axial direction.

[0102] With the above configuration 14), since the non-magnetic body is interposed between the first overlapping portion and the protruding portion, the end portion of the nonmagnetic body in the axial direction can be fixed more firmly. This shortens the axial length of the portion of the non-magnetic body that bends in the radial direction due to the excitation force, suppressing the vibration of the non-magnetic body.

[0103] 15) In some embodiments, in the pole piece rotor as defined in the above 14), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The pressing ring further includes a second overlapping portion (162) that overlaps with the end ring in the axial direction.

[0104] With the above configuration 15), since the pressing ring presses both the end ring and the non-magnetic body from the radially outer side, the end ring and the non-magnetic body are prevented from separating due to the generation of excitation force.

[0105] 16) In some embodiments, in the pole piece rotor as defined in the above 14) or 15), the pressing ring includes: a ring first end portion (157) that is one end portion in the circumferential direction; and a ring second end portion (158) that is the other end portion in the circumferential direction and faces the ring first end portion with a gap (H) in the circumferential direction.

[0106] With the above configuration 16), in the assembly process of the pole piece rotor, the pressing ring which has been deformed so that the gap widens in the circumferential direction can be attached to the annular body, facilitating the process of attaching the pressing ring. This improves the assembly of the pole piece rotor.

[0107] 17) In some embodiments, in the pole piece rotor as defined in any one of the above 14) to 16), the pole piece rotor further includes an outer cover (91) disposed on an outer peripheral surface of the annular body. The pressing ring is disposed on the one side in the axial direction relative to the outer cover.

[0108] The radial length of the outer air gap formed between the annular body and the stator should generally be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration 17), the pressing ring is restrained from entering the outer air gap. This prevents the pressing ring from colliding with other parts such as the stator during the rotation of the pole piece rotor. Furthermore, since the pressing ring, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap, the pressing ring does not obstruct the flow of magnetic flux formed in the outer air gap, and the magnetic geared electrical machine can operate normally.

[0109] 18) In some embodiments, in the pole piece rotor as defined in any one of the above 1) to 17), the annular body further includes an end ring (56) extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction. The pole piece rotor further includes: a contact plate (70) in contact with an outer peripheral surface (151) of the annular body, the contact plate being disposed so as to overlap with the protruding portion in the axial direction; and a plate fastening member (75) including an inserted shaft portion (76) inserted into a plate shaft hole (71) that passes through the contact plate in the radial direction, an end ring shaft hole (58) in the end ring, and a protrusion hole (73) in the protruding portion, the plate fastening member serving to press the contact plate against the outer peripheral surface.

[0110] With the above configuration 18), since the non-magnetic body is interposed between the contact plate and the protruding portion, the end portion of the non-magnetic body in the axial direction can be fixed more firmly. This shortens the axial length of the portion of the non-magnetic body that bends in the radial direction due to the excitation force, suppressing the vibration of the non-magnetic body.

[0111] 19) In some embodiments, in the pole piece rotor as defined in the above 18), the contact plate is in contact with both the end ring and the non-magnetic body.

[0112] With the above configuration 19), since the contact plate presses both the end ring and the non-magnetic body from the radially outer side, the end portion of the non-magnetic body is prevented from breaking and separating from the end ring due to the generation of excitation force.

[0113] 20) In some embodiments, in the pole piece rotor as defined in the above 18) or 19), the pole piece rotor further includes an outer cover (91) disposed on an outer peripheral surface of the annular body. The contact plate is disposed on the one side in the axial direction relative to the outer cover.

[0114] Generally, the radial length of the outer air gap formed between the annular body and the stator should be very short, for example, not more than a few mm or not more than 1 mm. In this regard, with the above configuration 20), the contact plate is restrained from entering the outer air gap. This prevents the contact plate from colliding with other parts such as the stator during the rotation of the pole piece rotor. Furthermore, since the contact plate, which may be made of, for example, a non-magnetic metal material, is restrained from entering the outer air gap, the contact plate does not obstruct the flow of magnetic flux formed in the outer air gap, and the magnetic geared electrical machine can operate normally.

[0115] 21) In some embodiments, in the pole piece rotor as defined in any one of the above 1) to 20), the pole piece rotor further includes: a fastening shaft (21) extending in the axial direction and inserted into an insertion-through hole (34) in the body portion and a nonmagnetic body hole (57) in the non-magnetic body; and a nut (22) screwed onto the fastening shaft at a position offset in the axial direction from the annular body.

[0116] With the above configuration 21), since the fastening shaft is inserted into the non magnetic body, the vibration of the non-magnetic body in the radial direction is suppressed.

[0117] 22) In some embodiments, in the pole piece rotor as defined in any one of the above 1) to 21), each non-magnetic body is longer than each pole piece in the axial direction.

[0118] Non-magnetic bodies that are longer than the pole pieces are disadvantageous in terms of rigidity in the radial direction. In this regard, with the above configuration 22), since the protruding portion supports the non-magnetic body elongated in the axial direction, the vibration of the non-magnetic body in the radial direction is suppressed.

[0119] 23) In some embodiments, in the pole piece rotor as defined in the above 22), each pole piece is disposed on the other side relative to the end portion of each non-magnetic body on the one side in the axial direction. The protruding portion is disposed on the one side in the axial direction relative to each pole piece.

[0120] With the above configuration 23), the amount of protrusion of the protruding portion from the body portion is reduced, so even when the excitation force is transmitted to the protruding portion, deformation of the protruding portion can be suppressed, and thus deformation of the annular body can be suppressed.

[0121] 24) A magnetic geared electrical machine (1) according to at least one embodiment of the present invention includes: the pole piece rotor (30) as defined in any one of the above 1) to 23); a magnet rotor (15) including a plurality of rotor magnets (19) disposed radially inward of the annular body of the pole piece rotor and arranged in the circumferential direction; and a stator (20) including a plurality of stator magnets (29) disposed radially outward of the annular body and arranged in the circumferential direction.

[0122] With the above configuration 24), the same effect is achieved as in the above 1). Reference Signs List

[0123] 1 Magnetic geared electrical machine 3 Inclined surface 5 Rotational shaft 19 Rotor magnet 20 Stator 21 Fastening shaft 22 Nut 29 Stator magnet 30 Pole piece rotor 31, 32 Connection member 33 One-side end surface 34 Insertion-through hole 35 Body portion 50 Annular body 51 First end portion 52 Second end portion 53 Non-magnetic body 55 Pole piece 56 End ring 57 Non-magnetic body hole 58 End ring shaft hole 59 End ring hole 60 Protruding portion 62 Non-magnetic body support surface 63 End ring support surface 65, 68, 129, 151 Outer peripheral surface 66 Step portion 68 Outer peripheral surface 70 Contact plate 71 Plate shaft hole 73 Protrusion hole 75 Plate fastening member 76 Inserted shaft portion 80 Fastening member 88 Shaft portion 91 Outer cover 92 Inner cover 95 Intervening member 99 Intervening inclined surface 110 Inner wedge 115 Inclined outer peripheral surface 119 Insertion hole 120 Outer wedge 122 Inclined inner peripheral surface 135 Through hole 152 Inner peripheral surface 156 End ring inner peripheral surface 157 Ring first end portion 158 Ring second end portion 160 Pressing ring 161 First overlapping portion 162 Second overlapping portion 561 End ring body portion 566 Ring projection 599 Clamping projecting portion H, K, M Gap

Claims

1. A pole piece rotor installed in a magnetic geared electrical machine, comprising:an annular body including a plurality of pole pieces and a plurality of non-magnetic bodies arranged alternately in a circumferential direction of the magnetic geared electrical machine; anda connection member including a body portion connecting an end portion of the annular body on one side in an axial direction to a rotational shaft of the magnetic geared electrical machine,wherein the connection member further includes a protruding portion disposed radially inward of the annular body and protruding from the body portion toward the other side in the axial direction, andwherein an outer peripheral surface of the protruding portion has a non-magnetic body support surface that supports at least one of the plurality of non-magnetic bodies.

2. The pole piece rotor according to claim 1,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction,wherein the outer peripheral surface of the protruding portion further has an end ring support surface that supports the end ring, the end ring support surface being located on the one side in the axial direction relative to the non-magnetic body support surface.

3. The pole piece rotor according to claim 1,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction,wherein the body portion further includes a step portion formed radially inward of theannular body and radially outward of the protruding portion, andwherein an outer peripheral surface of the step portion further has an end ring support surface that supports the end ring, the end ring support surface being formed on the one side in the axial direction relative to the non-magnetic body support surface.

4. The pole piece rotor according to claim 3, further comprising:an inner wedge disposed on the non-magnetic body support surface and including an inclined outer peripheral surface that is an outer peripheral surface inclined radially inward toward the one side in the axial direction;an outer wedge disposed between the inner wedge and the non-magnetic body and including an inclined inner peripheral surface that is an inner peripheral surface in contact with the inclined outer peripheral surface; anda fastening member including a shaft portion inserted into a through hole that passes through the body portion in the axial direction and inserted into an insertion hole formed in the inner wedge, the fastening member serving to press the inclined outer peripheral surface against the inclined inner peripheral surface.

5. The pole piece rotor according to claim 4,wherein the body portion includes a one-side end surface that is an end surface on the one side in the axial direction,wherein the one-side end surface has an inclined surface disposed radially inward of the fastening member and extending toward the other side in the axial direction as it goes radially inward.

6. The pole piece rotor according to claim 5,wherein the inner wedge faces the body portion with a gap in the axial direction.

7. The pole piece rotor according to any one of claims 4 to 6,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction, andwherein the end ring includes an end ring inner peripheral surface that faces an outer peripheral surface of the outer wedge with a gap in the radial direction.

8. The pole piece rotor according to claim 1,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction,wherein the outer peripheral surface of the protruding portion includes an end ring support surface that supports the end ring, the end ring support surface being inclined radially inward toward the other side in the axial direction,wherein the pole piece rotor comprises:an intervening member interposed between the end ring support surface and the end ring;a fastening shaft extending in the axial direction and inserted into an insertion-through hole in the body portion, an end ring hole in the end ring, and a non-magnetic body hole in the non-magnetic body; anda nut screwed onto the fastening shaft at a position offset in the axial direction from the annular body, andwherein the non-magnetic body support surface is the end ring support surface.

9. The pole piece rotor according to claim 8,wherein the end ring further includes:an end ring body portion extending in the circumferential direction; anda ring projection disposed on the other side in the axial direction relative to the intervening member and protruding from the end ring body portion radially inward, the ringprojection being in contact with the intervening member.

10. The pole piece rotor according to claim 8 or 9,wherein the intervening member includes an intervening inclined surface inclined radially inward toward the other side in the axial direction, the intervening inclined surface being in contact with the non-magnetic body support surface.

11. The pole piece rotor according to claim 8,wherein the connection member further includes a clamping projecting portion protruding from the body portion toward the other side in the axial direction and configured to work with the protruding portion to clamp the intervening member and the end ring.

12. The pole piece rotor according to claim 11, further comprising an outer cover disposed on an outer peripheral surface of the annular body,wherein the clamping projecting portion is disposed on the other side in the axial direction relative to the outer cover.

13. The pole piece rotor according to any one of claims 1 to 5, further comprising an inner cover disposed on an inner peripheral surface of the annular body,wherein the protruding portion is disposed on the one side in the axial direction relative to the inner cover.

14. The pole piece rotor according to any one of claims 1 to 5, further comprising a pressing ring extending in the circumferential direction on an outer peripheral surface of the annular body and configured to press the annular body radially inward, the pressing ring including a first overlapping portion that overlaps with the protruding portion in the axial direction.

15. The pole piece rotor according to claim 14,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction, andwherein the pressing ring further includes a second overlapping portion that overlaps with the end ring in the axial direction.

16. The pole piece rotor according to claim 14,wherein the pressing ring includes:a ring first end portion that is one end portion in the circumferential direction; anda ring second end portion that is the other end portion in the circumferential direction and faces the ring first end portion with a gap in the circumferential direction.

17. The pole piece rotor according to claim 14, further comprising an outer cover disposed on an outer peripheral surface of the annular body,wherein the pressing ring is disposed on the other side in the axial direction relative to the outer cover.

18. The pole piece rotor according to any one of claims 1 to 5,wherein the annular body further includes an end ring extending in the circumferential direction and connected to an end portion of each pole piece and an end portion of each magnetic body on the one side in the axial direction, andwherein the pole piece rotor further comprises:a contact plate in contact with an outer peripheral surface of the annular body, the contact plate being disposed so as to overlap with the protruding portion in the axial direction; anda plate fastening member including an inserted shaft portion inserted into a plate shaft hole that passes through the contact plate in the radial direction, an end ring shaft hole in the end ring, and a protrusion hole in the protruding portion, the plate fastening member servingto press the contact plate against the outer peripheral surface.

19. The pole piece rotor according to according to claim 18,wherein the contact plate is in contact with both the end ring and the non-magnetic body.

20. The pole piece rotor according to according to claim 18, further comprising an outer cover disposed on an outer peripheral surface of the annular body,wherein the contact plate is disposed on the one side in the axial direction relative to the outer cover.

21. The pole piece rotor according to any one of claims 1 to 5, further comprising:a fastening shaft extending in the axial direction and inserted into an insertion-through hole in the body portion and a non-magnetic body hole in the non-magnetic body; and a nut screwed onto the fastening shaft at a position offset in the axial direction from the annular body.

22. The pole piece rotor according to any one of claims 1 to 5,wherein each non-magnetic body is longer than each pole piece in the axial direction.

23. The pole piece rotor according to claim 22,wherein each pole piece is disposed on the other side relative to the end portion of each non-magnetic body on the one side in the axial direction, andwherein the protruding portion is disposed on the one side in the axial direction relative to each pole piece.

24. A magnetic geared electrical machine, comprising:the pole piece rotor according to any one of claims 1 to 5;a rotor including a plurality of rotor magnets disposed radially inward of the annular bodyof the pole piece rotor and arranged in the circumferential direction; anda stator including a plurality of stator magnets disposed radially outward of the annular body and arranged in the circumferential direction.INTERNATIONAL SEARCH REPORT International application No. PCT / JP2023 / 039229A. CLASSIFICATION OF SUBJECT MATTER H02K 7 / 22(2006.0¾ H02K 7 / 10(2006.01)1 FI: H02K1 / 22 Z; H02K7 / 10 A According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) H02K1 / 22; H02K7 / 10 Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Published examined utility model applications of Japan 1922-1996 Published unexamined utility model applications of Japan 1971-2023 Registered utility model specifications of Japan 1996-2023 Published registered utility model applications of Japan 1994-2023 Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. X Y JP 2019-68729 A (ROMAX TECHNOLOGY LIMITED) 25 April 2019 (2019-04-25) paragraphs 30-42, 46-56, fig. 5a-5b 1 24 A 2-23 Y A WO 2021 / 149772 Al (MITSUBISHI HEAVY INDUSTRIES, LTD.) 29 July 2021 (2021-07-29) paragraphs 12-156, fig. 1-3ID 24 2-23 | | Further documents are listed in the continuation of Box C. | V | See patent family annex. * Special categories of cited documents: “A” document defining the general state of the art which is not considered to be of particular relevance “E” earlier application or patent but published on or after the international filing date “L” document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified) “O” document referring to an oral disclosure, use, exhibition or other means “P” document published prior to the international filing date but later than the priority date claimed “T” later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention “X” document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone “Y” document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the ait document member of the same patent family Date of the actual completion of the international search Date of mailing of the international search report 28 November 2023 12 December 2023 Name and mailing address of the ISA / JP Authorized officer Japan Patent Office (ISA / JP) 3-4-3 Kasumigaseki, Chiyoda-ku, Tokyo 100-8915 Japan Telephone No.

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