Magnetic pole piece rotor and magnetic gear rotary machine

Abstract

To provide a magnetic pole piece rotor and a magnetic gear rotary machine which can suppress breakage of a non-magnetic body even when a temperature change occurs.SOLUTION: A magnetic pole piece rotor includes: a plurality of magnetic pole pieces arranged at intervals in a circumferential direction; and a plurality of non-magnetic bodies arranged alternately with the magnetic pole pieces. The magnetic pole pieces and the non-magnetic bodies each include an adjacent magnetic pole piece and an adjacent non-magnetic body adjacent to each other. The magnetic pole piece rotor further includes a buffer including a buffer body part held by the adjacent magnetic pole piece and the adjacent non-magnetic body. The material forming the adjacent non-magnetic body contains a plastic material and the Young's modulus of the buffer material is smaller than that of the plastic material.SELECTED DRAWING: Figure 3A

Description

Technical Field

[0001] The present disclosure relates to a magnetic pole piece rotor and a magnetic gear rotating machine.

Background Art

[0002] Conventionally, a magnetic pole piece rotor incorporated in a magnetic gear rotating machine is known. The magnetic pole piece rotor includes a plurality of magnetic pole pieces and a plurality of non-magnetic bodies arranged alternately in the circumferential direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, non-magnetic bodies have a property of being more likely to thermally deform than magnetic pole pieces. In the above patent document, a configuration is adopted in which two magnetic pole pieces sandwich one non-magnetic body in the circumferential direction, and the thermal deformation of the non-magnetic body is restricted by each of the two magnetic pole pieces. Therefore, when a temperature change occurs in the magnetic pole piece rotor, a large thermal strain occurs in the non-magnetic body, and there is a risk of damage to the non-magnetic body.

[0005] An object of the present disclosure is to provide a magnetic pole piece rotor and a magnetic gear rotating machine that can suppress damage to a non-magnetic body even when a temperature change occurs.

Means for Solving the Problems

[0006] The magnetic pole piece rotor according to at least one embodiment of the present disclosure is a plurality of magnetic pole pieces arranged at intervals in the circumferential direction, a plurality of non-magnetic bodies arranged alternately with the plurality of magnetic pole pieces in the circumferential direction, and is a magnetic pole piece rotor comprising Each of the plurality of magnetic pole pieces and the plurality of non-magnetic bodies includes an adjacent magnetic pole piece and an adjacent non-magnetic body that are adjacent to each other. The magnetic pole piece rotor further includes a buffer material including a buffer main body portion sandwiched between the adjacent magnetic pole piece and the adjacent non-magnetic body. The material forming the adjacent non-magnetic body includes a plastic material. The Young's modulus of the buffer material is smaller than the Young's modulus of the plastic material.

[0007] The magnetic gear rotating machine according to at least one embodiment of the present disclosure includes the above-described magnetic pole piece rotor, a magnet rotor located radially inward with respect to the plurality of magnetic pole pieces and the plurality of non-magnetic bodies, and a stator located radially outward with respect to the plurality of magnetic pole pieces and the plurality of non-magnetic bodies.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to provide a magnetic pole piece rotor that can suppress breakage of a non-magnetic body even when a temperature change occurs, and a magnetic gear rotating machine.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 3E

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0010] Hereinafter, some embodiments of the present disclosure will be described 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 disclosure, but are merely illustrative examples. For example, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent states in which there are tolerances or relative displacements with angles and distances that can obtain the same function. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent states in which there are tolerances or differences that can obtain the same function. For example, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including uneven portions, chamfered portions, etc. within a range where the same effect can be obtained. On the other hand, the expression "comprising", "including", or "having" one component is not an exclusive expression that excludes the existence of other components. Note that the same reference numerals may be given to the same configurations and the description may be omitted.

[0011] <Overview of the Magnetic Gear Rotating Machine 1> FIG. 1 is a schematic view of a magnetic gear rotating machine 1 according to an embodiment of the present disclosure. In the following description, the "axial direction" is the axial direction of the axis S of the magnetic gear rotating machine 1, the "circumferential direction" is the circumferential direction with respect to the axis S, and the "radial direction" is the radial direction with respect to the axis S. Further, the "outer side in the radial direction" is the side in the direction away from the axis S, and the "inner side in the radial direction" is the side in the direction approaching the axis S.

[0012] The magnetic gear rotating machine 1 is connected to an external device 9 via a rotating shaft 18. The axis of the rotating shaft 18 substantially coincides with the above-described axis S. In FIG. 1, for the sake of simplifying the drawing, the rotating shaft 18 is depicted as a single solid shaft member, but the present disclosure is not limited thereto. The rotating shaft 18 may be realized by a plurality of shaft members, and the plurality of shaft members may include shaft members formed in a cylindrical shape.

[0013] The magnetic gear rotating machine 1 includes a magnet rotor 10 connected to the rotating shaft 18 via a bearing B1. The magnet rotor 10 has a rotor core 15 configured to rotate relative to the rotating shaft 18, and a plurality of magnets 19 supported by the rotor core 15. The plurality of magnets 19 are arranged in the circumferential direction in the rotor core 15. Further, each magnet 19 extends in the axial direction. In the magnet rotor 10 illustrated in FIG. 1, a surface magnet type (SPM) configuration in which a plurality of magnets 19 are provided on the surface of the rotor core 15 is adopted, but the present disclosure is not limited thereto. For example, a configuration of an interior permanent magnet type (IPM) in which a plurality of magnets 19 are embedded in the rotor core 15 may be adopted (see FIG. 2).

[0014] The magnetic gear rotating machine 1 further includes a magnetic pole piece rotor 30 configured to rotate integrally with the rotating shaft 18. The magnetic pole piece rotor 30 includes a ring unit 33 disposed outside the magnet rotor 10 in the radial direction, a first connecting portion 31 connecting one end portion of the ring unit 33 in the axial direction and the rotating shaft 18, and a second connecting portion 32 connecting the other end portion of the ring unit 33 and the rotating shaft 18. Details of the ring unit 33 will be described later.

[0015] The magnetic gear rotating machine 1 further includes a stator 20 disposed radially outside the ring unit 33. The stator 20 has a stator core 22 extending in the circumferential direction, a plurality of stator coils 27 disposed on the stator core 22, and a plurality of stator magnets 29 attached to the inner peripheral surface of the stator core 22. The stator coils 27 are electrically connected to the electrical system 16. The plurality of stator magnets 29 are arranged in the circumferential direction (see FIG. 2).

[0016] Several methods can be adopted to attach the stator magnets 29 to the stator core 22. As a first method, each stator magnet 29 may be attached to the inner peripheral surface of the stator core 22 by an adhesive. As a second method, each stator magnet 29 may be attached to two fingers (or two protrusions) protruding radially inward from the inner peripheral surface of the stator core 22. Also, an attachment method combining the first method and the second method may be adopted.

[0017] Referring to FIG. 2, the ring unit 33 of the pole piece rotor 30 is illustrated. The ring unit 33 faces the magnet rotor 10 radially with the inner air gap G1 therebetween, and faces the stator 20 radially with the outer air gap G2 therebetween.

[0018] The ring unit 33 includes a plurality of pole pieces 35 and a plurality of non-magnetic bodies 36 that are alternately arranged in the circumferential direction, and each of the pole pieces 35 and each of the non-magnetic bodies 36 extend in the axial direction. Each pole piece 35 is realized by a plurality of electromagnetic steel sheets laminated in the axial direction, one or more compacted powder cores extending in the axial direction, or a combination thereof. Also, at least one of the plurality of pole pieces 35 may be formed with a pole piece hole 56 that is open in the axial direction. The pole piece hole 56 may function as a ventilation path through which cooling air can pass, or may function as an insertion hole into which a support shaft for supporting the pole piece 35 is inserted.

[0019] The material forming the non-magnetic body 36 includes a plastic material. For example, the non-magnetic body 36 is formed of fiber-reinforced plastic (FRP). In this case, the non-magnetic body 36 has a structure in which a plurality of prepregs 89 are laminated. The lamination direction of the prepregs 89 may be the radial direction (see FIG. 3A) or the circumferential direction (not shown). Note that the non-magnetic body 36 preferably has not only non-magnetic properties but also non-conductive properties.

[0020] The ring unit 33 may further include an inner cover 339 and an outer cover 332 that sandwich a plurality of magnetic pole pieces 35 and a plurality of non-magnetic bodies 36 in the radial direction. The inner cover 339 and the outer cover 332 are cylindrical members formed of a non-magnetic material such as FRP, for example. However, the present disclosure is not limited to this, and the inner cover 339 and the outer cover 332 may not be provided. In this case, each of the magnetic pole pieces 35 and each of the non-magnetic bodies 36 are exposed to each of the inner air gap G1 and the outer air gap G2.

[0021] Returning to FIG. 1, the magnetic gear rotating machine 1 according to one embodiment is a magnetic gear generator configured to generate electricity by inputting power from an external device 9 that may be a prime mover, for example. Its operating principle is as follows. When the external device 9 drives the rotating shaft 18, the magnetic pole piece rotor 30 rotates. The relative positional relationship between the plurality of magnets 19 and the plurality of magnetic pole pieces 35 with respect to the plurality of stator magnets 29 changes, and the magnetic flux between the magnet rotor 10 and the stator 20 is modulated. When the magnet 19 receives a magnetic force from the modulated magnetic field and the magnet rotor 10 rotates, a current is generated in the stator coil 27 by electromagnetic induction, and power is supplied from the stator coil 27 to the electrical system 16.

[0022] The magnetic gear rotating machine 1 according to another embodiment is a magnetic gear motor configured to output power to an external device 9 by supplying power from an electrical system 16. Its operating principle is as follows. The magnet rotor 10 rotates due to the rotating magnetic field generated by controlling the current flowing through the stator coil 27. The relative positional relationship between the plurality of magnets 19 and the plurality of magnetic pole pieces 35 with respect to the plurality of stator magnets 29 changes, and the magnetic flux between the magnet rotor 10 and the stator 20 is modulated. The magnetic pole piece rotor 30 rotates when the magnetic pole pieces 35 receive magnetic force from the modulated magnetic field, and power is output from the rotating shaft 18 to the external device 9. In this case, the external device 9 may be, for example, an electric vehicle, and the power output from the rotating shaft 18 may be transmitted to the drive shaft of the electric vehicle.

[0023] In FIG. 1, a structure in which the rotating shaft 18 rotates together with the magnetic pole piece rotor 30 is illustrated, but the present disclosure is not limited thereto. For example, a structure in which the rotating shaft 18 rotates together with the magnet rotor 10 may be adopted. In this case, the magnetic pole piece rotor 30 is connected to the rotating shaft 18 via a bearing. Further, the magnetic pole piece rotor 30 may be configured to rotate together with a shaft member different from the rotating shaft 18. When the other shaft member is connected to a device different from the external device 9, the magnetic gear rotating machine 1 can also transmit the power output from the other shaft member to the device.

[0024] <Magnetic pole piece rotors 30A to 30E (30)> FIGS. 3A to 3E illustrate magnetic pole piece rotors 30A to 30E (30) according to some embodiments. Prior to a detailed description of each embodiment, a configuration common to these embodiments will be described. In the following description, any two adjacent ones among the plurality of magnetic pole pieces 35 and the plurality of non-magnetic bodies 36 arranged alternately in the circumferential direction may be referred to as an "adjacent magnetic pole piece 37" and an "adjacent non-magnetic body 38". The adjacent non-magnetic body 38 is located between two magnetic pole pieces 35 adjacent to each other with a space therebetween in the circumferential direction.

[0025] The pole piece rotor 30A to 30E (30) includes a buffer material 50. The buffer material 50 includes a buffer body portion 53 sandwiched between an adjacent pole piece 37 and an adjacent non-magnetic body 38. The buffer material 50 extends in the axial direction. The buffer material 50 is interposed between the adjacent pole piece 37 and the adjacent non-magnetic body 38 over the entire axial length of each of the adjacent pole piece 37 and the adjacent non-magnetic body 38. The buffer material 50 may be formed of a thermoplastic resin such as polyetherimide (PEI), polyamide (PA), or polypropylene (PP), or may be formed of a thermoplastic elastomer or synthetic rubber. The material forming the adjacent non-magnetic body 38 (non-magnetic body 36) includes a plastic material as described above, but the plastic material and the material forming the buffer material 50 are different from each other.

[0026] The Young's modulus of the buffer material 50 is smaller than the Young's modulus of the plastic material of the adjacent non-magnetic body 38. This relationship of Young's modulus holds in both the circumferential direction and the radial direction. More specifically, the Young's modulus of the buffer material 50 in the circumferential direction is smaller than the Young's modulus of the plastic material of the adjacent non-magnetic body 38 in the circumferential direction, and the Young's modulus of the buffer material 50 in the radial direction is smaller than the Young's modulus of the plastic material of the adjacent non-magnetic body 38 in the radial direction.

[0027] According to the above configuration, the buffer material 50 is more easily deformed than the adjacent non-magnetic body 38. Therefore, when a temperature change occurs in the pole piece rotor 30, the adjacent non-magnetic body 38 can thermally deform while deforming the buffer material 50, so the thermal stress generated in the adjacent non-magnetic body 38 is reduced. Thus, a pole piece rotor 30 capable of suppressing damage to the non-magnetic body 36 even when a temperature change occurs is realized.

[0028] To give a more specific example, when the pole piece rotor 30 includes a thermoplastic adhesive (for example, the first adhesive layer 71 shown in FIG. 3A) interposed between the buffer material 50 and the adjacent non-magnetic body 38, a manufacturing process of heating the ring unit 33 using a device such as an autoclave is required. When cooling the heated ring unit 33, if the thermal contraction of the adjacent non-magnetic body 38 is inhibited by the adjacent pole piece 37, the thermal strain in the adjacent non-magnetic body 38 increases, and there is a possibility of damage to the adjacent non-magnetic body 38. In this regard, according to the above configuration, at least a part of the buffer material 50 deforms together with the adjacent non-magnetic body 38, and the thermal strain of the adjacent non-magnetic body 38 can be reduced. Thereby, damage to the adjacent non-magnetic body 38 can be suppressed.

[0029] To give another specific example, during the operation of the magnetic gear rotating machine 1, the temperature of the ring unit 33 rises due to the generation of eddy currents in the adjacent pole piece 37 or the like. If the thermal expansion of the adjacent non-magnetic body 38 due to the temperature rise is inhibited by the adjacent pole piece 37, the thermal strain in the adjacent non-magnetic body 38 increases, and there is a possibility of damage to the adjacent non-magnetic body 38. In this regard, according to the above configuration, the deformation of the buffer material 50 reduces the thermal strain of the adjacent non-magnetic body 38, and damage to the adjacent non-magnetic body 38 is suppressed.

[0030] Note that the Young's modulus of the plastic material of the adjacent non-magnetic body 38 is smaller than the Young's modulus of the adjacent pole piece 37. This relationship of the Young's modulus holds in both the circumferential direction and the radial direction.

[0031] Hereinafter, the configurations of each of the pole piece rotors 30A to 30E (30) will be described in detail.

[0032] <The pole piece rotor 30A according to the first embodiment> FIG. 3A shows a schematic view of the pole piece rotor 30A (30) according to the first embodiment. The adjacent non-magnetic body 38A (38) of the pole piece rotor 30A (30) includes a pair of non-magnetic divided portions 39A (39) arranged at intervals in the radial direction, and an intermediate portion 42 connecting the end portions of each non-magnetic divided portion 39A in the circumferential direction. The intermediate portion 42 is shorter than the non-magnetic divided portion 39A in the circumferential direction, and a non-magnetic hole 57 is formed on the side opposite to the adjacent pole piece 37A (37) with respect to the intermediate portion 42. In other words, the pair of non-magnetic divided portions 39A are arranged in the radial direction with the non-magnetic hole 57 therebetween in the axial view.

[0033] According to the above configuration, the non-magnetic hole 57 can be used as a ventilation path through which the cooling air passes. Therefore, it is possible to reduce the temperature rise in the adjacent non-magnetic body 38, and suppress the thermal deformation of the adjacent non-magnetic body 38A. Note that the adjacent non-magnetic body 38A may not include the intermediate portion 42. In this case, the non-magnetic hole 57 is formed over the entire circumferential length of the adjacent non-magnetic body 38A. Further, instead of functioning as a ventilation path, the non-magnetic hole 57 may function as an insertion hole into which a rod member for supporting the adjacent non-magnetic body 38A is inserted. If the rod member is cylindrical, the cylindrical hole formed inside thereof can function as a ventilation path.

[0034] The description of the pole piece rotor 30A continues. The adjacent non-magnetic body 38A is formed by a plurality of prepregs 89 laminated in the radial direction. More specifically, the prepreg 89 has a plurality of first prepregs 81 forming each non-magnetic divided portion 39A, and a plurality of second prepregs 82 forming the intermediate portion 42.

[0035] The buffer member 50A (50) of the pole piece rotor 30A includes a buffer main body portion 53A (53). The buffer main body portion 53A is plate-shaped having a thickness in the circumferential direction. Further, the buffer main body portion 53 abuts on the adjacent non-magnetic body 38A over the entire radial length of the adjacent non-magnetic body 38A. More specifically, the buffer main body portion 53A has a pair of first contact surfaces 51A (51) respectively abutting on the pair of non-magnetic divided portions 39A, and an intermediate contact surface 59 abutting on the intermediate portion 42.

[0036] According to the above configuration, since the buffer member 50A can abut against each of the pair of non-magnetic divided portions 39A, thermal deformation of each non-magnetic divided portion 39A is allowed. Therefore, breakage in each non-magnetic divided portion 39A can be suppressed. Note that the adjacent non-magnetic body 38A may not include the intermediate portion 42. Even in this case, the above-described technical advantages can be obtained.

[0037] Continuing the description of the pole piece rotor 30A. The pole piece rotor 30A includes a first adhesive layer 71 interposed between the adjacent non-magnetic body 38A and the buffer main body portion 53A. The first contact surface 51A and the intermediate contact surface 59 are each in contact with the non-magnetic divided portion 39A and the intermediate portion 42 via the first adhesive layer 71.

[0038] Furthermore, the pole piece rotor 30A includes a second adhesive layer 72, a third adhesive layer 73, and a fourth adhesive layer (not shown). The second adhesive layer 72 is interposed between the buffer main body portion 53A and the adjacent pole piece 37A. The second adhesive layer 72 is interposed between the buffer main body portion 53A and the adjacent pole piece 37A over the entire radial length of each of the buffer main body portion 53A and the adjacent pole piece 37A. The third adhesive layer 73 is disposed on the outer peripheral surface of the inner cover 339, and the fourth adhesive layer is disposed on the inner peripheral surface of the outer cover 332. Thereby, the inner cover 339 and the outer cover 332 are each adhered to the adjacent pole piece 37A and the adjacent non-magnetic body 38A.

[0039] According to the configuration in which the pole piece rotor 30A includes the first adhesive layer 71, when the adjacent non-magnetic body 38A undergoes thermal deformation, the first adhesive layer 71 deforms, so that thermal strain of the adjacent non-magnetic body 38A can be suppressed. Thereby, even when a temperature change occurs, breakage of the adjacent non-magnetic body 38A can be suppressed. Note that even if the adjacent pole piece 37A does not include the second adhesive layer 72, the third adhesive layer 73, and the fourth adhesive layer, the above-described technical advantages can be obtained.

[0040] The first adhesive layer 71, the second adhesive layer 72, the third adhesive layer 73, and the fourth adhesive layer are also provided in the pole piece rotors 30B to 30E described later. However, in FIGS. 3B to 3E, for the convenience of viewing the drawings, the illustration of these adhesive layers is omitted. These adhesive layers are not essential components of the present disclosure.

[0041] The linear expansion coefficient of the buffer material 50A (50) exemplified in FIG. 3A is larger than the linear expansion coefficient of the adjacent pole piece 37A (37) and smaller than the linear expansion coefficient of the plastic material forming the adjacent non-magnetic body 38A. For example, when a structure in which the prepregs 89 are laminated in the radial direction is adopted, the adjacent non-magnetic body 38A is likely to deform in the radial direction. Therefore, the above relationship of the linear expansion coefficients preferably holds at least in the radial direction. That is, the linear expansion coefficient of the buffer material 50A in the radial direction is larger than the linear expansion coefficient of the adjacent pole piece 37A in the radial direction and smaller than the linear expansion coefficient of the plastic material forming the adjacent non-magnetic body 38A in the radial direction. On the other hand, when a structure in which the prepregs 89 are laminated in the circumferential direction is adopted (not shown), the adjacent non-magnetic body 38A is likely to deform at least in the circumferential direction. Therefore, the above relationship of the linear expansion coefficients preferably holds in the circumferential direction.

[0042] According to the above configuration, when the temperature of the pole piece rotor 30A changes, the buffer material 50A is more likely to thermally deform than the adjacent pole piece 37A and less likely to thermally deform than the adjacent non-magnetic body 38A. Thereby, the buffer material 50A can be appropriately deformed so as to allow the thermal deformation of the adjacent non-magnetic body 38A, and the generation of high thermal stress in the adjacent non-magnetic body 38A can be suppressed.

[0043] <Pole Piece Rotor 30B According to the Second Embodiment> FIG. 3B shows a schematic view of the pole piece rotor 30B (30) according to the second embodiment. Among the components according to the second embodiment, the description of those similar to the components exemplified in FIG. 3A may be omitted or simplified.

[0044] The cushioning material 50B (50) of the magnetic pole piece rotor 30B (30) includes a cushioning main body portion 53B (53). The cushioning main body portion 53B has a pair of first contact surfaces 51B (51) that respectively contact a pair of non-magnetic divided portions 39B (39) of the adjacent non-magnetic body 38B (38). The first contact surface 51B is inclined with respect to the radial direction. The angle (acute angle) at which the first contact surface 51 is inclined with respect to the radial direction is, for example, 30° or more and 45° or less.

[0045] According to the configuration in which the first contact surface 51B is inclined with respect to the radial direction, even when the non-magnetic divided portion 39B undergoes thermal deformation in either the circumferential direction or the radial direction, the cushioning main body portion 53B can deform in response to the thermal deformation. Therefore, breakage in each non-magnetic divided portion 39B can be suppressed.

[0046] An example of the direction in which the first contact surface 51B is inclined will be described. In the example of FIG. 3B, the center of the adjacent non-magnetic body 38B (38) in the axial direction view is defined as the non-magnetic center Cr. The non-magnetic center Cr is the center of the adjacent non-magnetic body 38B (38) in each of the circumferential direction and the radial direction. Each of the pair of first contact surfaces 51B is inclined so as to face the non-magnetic center Cr side in the circumferential direction as it faces the non-magnetic center Cr side in the radial direction.

[0047] According to the above configuration, as the distance from the non-magnetic center Cr increases in the radial direction, the circumferential length of the non-magnetic divided portion 39B becomes longer, so the amount of thermal deformation of the non-magnetic divided portion 39B in the circumferential direction increases. Even in this case, since the cushioning material 50B can deform in response to the thermal deformation of the non-magnetic divided portion 39B, breakage in each non-magnetic divided portion 39B can be suppressed.

[0048] As described above, the magnetic pole piece rotor 30B may further include adhesive layers such as a first adhesive layer 71 (see FIG. 3A) and a second adhesive layer 72 (see FIG. 3A). The first adhesive layer 71 is interposed between the first contact surface 51B and the non-magnetic divided portion 39B, and the second adhesive layer 72 is interposed between the cushioning main body portion 53B and the adjacent magnetic pole piece 37.

[0049] <Magnetic Pole Piece Rotor 30C According to the Third Embodiment> FIG. 3C shows a schematic view of the pole piece rotor 30C (30) according to the third embodiment. Among the components according to the third embodiment, the description of those similar to the components illustrated in FIGS. 3A and 3B may be omitted or simplified.

[0050] The buffer member 50C (50) of the pole piece rotor 30C (30) includes a buffer main body portion 53C (53). The buffer main body portion 53C is located between the adjacent non-magnetic body 38C (38) and the adjacent pole piece 37. The adjacent non-magnetic body 38C includes a pair of non-magnetic divided portions 39C (39), but does not include the intermediate portion 42 (see FIG. 3A).

[0051] The buffer member 50C (50) includes a buffer hole portion 60C (60) which is an opening extending in the axial direction in the buffer main body portion 53C. The buffer hole portion 60C penetrates the buffer main body portion 53C in the axial direction. According to the above configuration, since the rigidity of the buffer main body portion 53C is reduced, the buffer main body portion 53C is more easily deformed. Therefore, the thermal strain in the non-magnetic divided portion 39C can be further reduced, and the breakage of the non-magnetic divided portion 39C can be further suppressed. Further, since the buffer hole portion 60C penetrates the buffer main body portion 53C, the manufacturing process of forming the buffer hole portion 60C in the buffer member 50C can be simplified.

[0052] Continuing the description of the pole piece rotor 30C. The buffer main body portion 53C has a pair of first contact surfaces 51C (51) respectively contacting the pair of non-magnetic divided portions 39C. Each of the first contact surfaces 51C has a first end 111 on the non-magnetic center Cr side in the axial view.

[0053] The buffer hole portion 60C has a first concave portion 61 that is recessed from the first end 111 side toward the adjacent pole piece 37 side in the circumferential direction. As an example, the first concave portion 61 is configured such that the radial dimension (dimension La) becomes longer as it moves away from the first end 111 in the circumferential direction. However, the present disclosure is not limited to this, and for example, the first concave portion 61 may be formed such that the radial dimension is the same regardless of the circumferential position. In this case, the first concave portion 61 is rectangular in the axial view.

[0054] According to the configuration in which the buffer hole portion 60C has the first concave portion 61, the buffer main body portion 53C is particularly likely to be deformed on the non-magnetic center Cr side. For example, the first end 111, which is a portion of the buffer main body portion 53C located on the non-magnetic center Cr side, is likely to be deformed in the radial direction. Thereby, the thermal strain in the portion of the non-magnetic dividing portion 39C on the non-magnetic center Cr side can be reduced, and breakage of the non-magnetic dividing portion 39C can be suppressed. As a more specific example, the portion of the non-magnetic dividing portion 39C surrounded by the two-dot chain line M1 can be thermally deformed in the circumferential direction or the radial direction while pushing aside the first end 111, so that the thermal strain in the portion can be reduced.

[0055] Further, according to the configuration in which the first concave portion 61 has a radial dimension (dimension La) that increases as it moves away from the first end 111 in the circumferential direction, the first concave portion 61 can be enlarged, so the rigidity of the buffer main body portion 53C is further reduced. Therefore, the thermal strain of the non-magnetic dividing portion 39C can be further reduced.

[0056] <Magnetic Pole Piece Rotor 30D According to the Fourth Embodiment> FIG. 3D shows a schematic view of a magnetic pole piece rotor 30D (30) according to the fourth embodiment. Among the components according to the fourth embodiment, the description of those similar to the components illustrated in FIGS. 3A to 3C may be omitted or simplified.

[0057] The adjacent non-magnetic body 38D (38) of the magnetic pole piece rotor 30D (30) is not provided with a non-magnetic hole 57 (see FIG. 3A), and an integral structure in which prepregs 89 are laminated over the entire radial length of the adjacent non-magnetic body 38D is adopted. However, the fourth embodiment is not limited to this, and the adjacent non-magnetic body 38D may include a pair of non-magnetic dividing portions 39A (see FIG. 3A) arranged with the non-magnetic hole 57 interposed therebetween.

[0058] The magnetic pole piece rotor 30D (30) is provided with a buffer member 50D (50), and the buffer member 50D (50) includes a buffer main body portion 53D (53). The buffer main body portion 53D has a second contact surface 52 that contacts the adjacent magnetic pole piece 37D (37). The buffer hole portion 60D (60) includes a second recess 62 formed in the second contact surface 52. The second recess 62 penetrates the buffer main body portion 53D in the axial direction.

[0059] Further, the adjacent magnetic pole piece 37D of the magnetic pole piece rotor 30D includes a magnetic pole piece end face 101 that contacts the second contact surface 52, and a magnetic pole piece recess 102 formed in the magnetic pole piece end face 101. In this example, the space Sp defined by the magnetic pole piece recess 102 and the space S2 defined by the second recess 62 communicate with each other.

[0060] Explain the technical advantages of the buffer hole portion 60D including the second recess 62. Generally, the adjacent magnetic pole piece 37D is less likely to thermally deform than the adjacent non-magnetic body 38D, and can exert an action of preventing thermal deformation on the adjacent non-magnetic body 38D. In this regard, according to the above configuration, since the contact range in the radial direction between the buffer main body portion 53D and the adjacent magnetic pole piece 37D is reduced by providing the second recess 62, it is possible to suppress the action of preventing thermal deformation from being exerted on the adjacent non-magnetic body 38D. Therefore, the thermal strain of the adjacent non-magnetic body 38D can be reduced. Note that the adjacent magnetic pole piece 37D may not include the magnetic pole piece recess 102. Even in this case, the above technical advantages can be obtained.

[0061] The second recess 62 illustrated in FIG. 3D is configured such that the radial dimension (dimension Lb) becomes longer as it approaches the adjacent magnetic pole piece 37D in the circumferential direction. According to the above configuration, the contact range in the radial direction between the buffer main body portion 53D and the adjacent magnetic pole piece 37D can be further reduced.

[0062] <Magnetic Pole Piece Rotor 30E According to the Fifth Embodiment> FIG. 3E shows a schematic view of the magnetic pole piece rotor 30E (30) according to the fifth embodiment. Among the components according to the fifth embodiment, the description of those similar to the components illustrated in FIGS. 3A to 3D may be omitted or simplified.

[0063] The buffer material 50E (50) according to the fifth embodiment includes a buffer main body portion 53E (53) and an intervening portion 54. The intervening portion 54 extends from the buffer main body portion 53E along the circumferential direction to the side opposite to the adjacent magnetic pole piece 37 side. The intervening portion 54 and the buffer main body portion 53E are integrally formed of the same material. The intervening portion 54 is radially sandwiched by a pair of non-magnetic divided portions 39E (39) of the adjacent non-magnetic body 38E (38). No non-magnetic hole 57 (see FIG. 3A) is formed in the adjacent non-magnetic body 38E.

[0064] According to the above configuration, the pair of non-magnetic divided portions 39E can be joined via the intervening portion 54. Further, since the thermal strain of the non-magnetic divided portion 39E can be reduced by the deformation of the intervening portion 54, breakage of the non-magnetic divided portion 39E can be suppressed.

[0065] Each non-magnetic divided portion 39E illustrated in FIG. 3E includes a first non-magnetic contact surface 391 that contacts the first contact surface 51E (51) of the buffer main body portion 53E, and a second non-magnetic contact surface 392 that contacts the intervening portion 54. The non-magnetic connection surface 395, which is the portion where the first non-magnetic contact surface 391 and the second non-magnetic contact surface 392 are connected, is an R surface. Note that the non-magnetic connection surface 395 may be a C surface (not shown).

[0066] According to the above configuration, since the corners of the non-magnetic divided portion 39E become a C surface or an R surface, concentration of thermal stress on the non-magnetic divided portion 39E can be suppressed. Further, it is also possible to make the layer made of the adhesive between the non-magnetic connection surface 395 and the buffer material 50E thicker than the first adhesive layer 71 (see FIG. 4) and the fifth adhesive layer 75 (see FIG. 4) described later, and it becomes possible to avoid concentration of thermal stress.

[0067] FIG. 4 is a schematic view showing a further specific configuration of the buffer material 50E and the adjacent non-magnetic body 38E according to the fifth embodiment. In the figure, the illustration of the non-magnetic connection surface 395 (see FIG. 3E) is omitted.

[0068] The buffer material 50E has a substantially symmetric shape in the circumferential direction. More specifically, the buffer material 50E includes a pair of buffer main body portions 53E arranged side by side in the circumferential direction with the intervening portion 54 therebetween. And, the above-described first adhesive layer 71 is disposed between the buffer main body portion 53E and the non-magnetic dividing portion 39E, and a fifth adhesive layer 75 is disposed between the intervening portion 54 and the non-magnetic dividing portion 39. The first adhesive layer 71 and the fifth adhesive layer 75 are integrally formed thermoplastic adhesives, and the buffer material 50E and the adjacent non-magnetic body 38E are integrally formed. The first adhesive layer 71 and the fifth adhesive layer 75 may be rubber-based adhesives or elastomer sheets.

[0069] <Other Modification Examples> FIG. 5 is a schematic view showing a buffer material 50 according to a modification example. The buffer hole portion 60 of the buffer material 50 illustrated in the figure is a hollow portion extending in the axial direction inside the buffer main body portion 53. If the buffer material 50 is a resin molded product, it is possible to form such a hollow portion. This configuration may be applied to the buffer hole portions 60C and 60D illustrated in FIGS. 3C and 3D.

[0070] FIG. 6 is a schematic view showing an adjacent non-magnetic body 38. The adjacent non-magnetic body 38 may be formed of a single resin member instead of an FRP structure. In this case, the adjacent non-magnetic body 38 does not include a plurality of laminated prepregs 89. Further, the buffer material 50 may be disposed only on one side in the circumferential direction with respect to the adjacent non-magnetic body 38. Even in this case, it is possible to obtain the technical advantage of reducing the thermal strain of the adjacent non-magnetic body 38.

[0071] <Summary> The content described in several of the above-described embodiments is understood as follows, for example.

[0072] 1) The pole piece rotor (30) according to at least one embodiment of the present disclosure is a plurality of pole pieces (35) arranged at intervals in the circumferential direction, a plurality of non-magnetic bodies (36) alternately arranged with the plurality of pole pieces in the circumferential direction, a pole piece rotor comprising Each of the plurality of magnetic pole pieces and the plurality of non-magnetic bodies includes an adjacent magnetic pole piece (37) and an adjacent non-magnetic body (38) that are adjacent to each other. The magnetic pole piece rotor further includes a buffer material (50) including a buffer main body portion (53) sandwiched between the adjacent magnetic pole piece and the adjacent non-magnetic body. The material forming the adjacent non-magnetic body includes a plastic material. The Young's modulus of the buffer material is smaller than the Young's modulus of the plastic material.

[0073] According to the configuration of 1) above, the buffer material is more likely to deform than the plastic material of the adjacent non-magnetic body. When a temperature change occurs in the magnetic pole piece rotor, the adjacent non-magnetic body can thermally deform while deforming the buffer material, so the thermal stress generated in the adjacent non-magnetic body is reduced. Therefore, a magnetic pole piece rotor capable of suppressing damage to the non-magnetic body even when a temperature change occurs is realized.

[0074] 2) In some embodiments, the magnetic pole piece rotor described in 1) above, The adjacent non-magnetic body includes a pair of non-magnetic divided portions (39) arranged at intervals in the radial direction. The buffer main body portion has a pair of first contact surfaces (51) respectively contacting the pair of non-magnetic divided portions.

[0075] According to the configuration of 2) above, since the buffer material can contact each of the pair of non-magnetic divided portions, thermal deformation of each non-magnetic divided portion is allowed. Therefore, damage in each non-magnetic divided portion can be suppressed.

[0076] 3) In some embodiments, the magnetic pole piece rotor described in 2) above, Each of the pair of first contact surfaces is inclined with respect to the radial direction.

[0077] According to the configuration of 3) above, even when the non-magnetic divided portion thermally deforms in either the circumferential direction or the radial direction, the buffer main body portion can deform in response to the thermal deformation. Therefore, damage in each non-magnetic divided portion can be suppressed.

[0078] 4) In some embodiments, the pole piece rotor described in 2) or 3) above, defining the center of the adjacent non-magnetic body in the axial direction view as the non-magnetic center (Cr), each of the pair of first contact surfaces is inclined so as to face the non-magnetic center side in the circumferential direction and to face the non-magnetic center side in the radial direction.

[0079] According to the configuration of 4) above, since the circumferential length of each of the non-magnetic divided portions becomes longer, the amount of thermal deformation in the circumferential direction of the non-magnetic divided portions increases. Even in this case, since the buffer material can be deformed according to the thermal deformation of the non-magnetic divided portions, breakage in each of the non-magnetic divided portions can be suppressed.

[0080] 5) In some embodiments, the pole piece rotor described in 3) or 4) above, the buffer material includes a buffer hole portion (60) which is an opening or a hollow portion extending in the axial direction in the buffer main body portion.

[0081] According to the configuration of 5) above, since the rigidity of the buffer main body portion is reduced, the buffer main body portion is more easily deformed. Therefore, the thermal strain in the non-magnetic divided portions can be further reduced, and breakage of the non-magnetic divided portions can be further suppressed.

[0082] 6) In some embodiments, the pole piece rotor described in 5) above, each of the pair of first contact surfaces has a first end (111) on the non-magnetic center (Cr) side which is the center of the adjacent non-magnetic body in the axial direction view, the buffer hole portion has a first recess (61) which is recessed from the first end side toward the adjacent pole piece side in the circumferential direction.

[0083] According to the configuration of 6) above, the buffer main body portion is particularly easily deformed on the non-magnetic center side. Thereby, the thermal strain in the portion on the non-magnetic center side of the non-magnetic divided portions can be reduced, and breakage of the non-magnetic divided portions can be suppressed.

[0084] 7) In some embodiments, the pole piece rotor described in 6) above, the first recess is configured such that its radial dimension increases as it moves away from the first end in the circumferential direction.

[0085] According to the configuration of 7) above, since the first recess can be enlarged, the rigidity of the buffer body portion is further reduced. Therefore, the thermal strain in the non-magnetic divided portion can be further reduced.

[0086] 8) In some embodiments, the pole piece rotor described in any one of 2) to 7) above, the buffer body portion has a second contact surface (52) that contacts the adjacent pole piece, the buffer material includes a buffer hole portion (60) that is an opening or a hollow portion extending in the axial direction in the buffer body portion, the buffer hole portion includes a second recess (62) formed on the second contact surface.

[0087] Generally, adjacent pole pieces are less likely to thermally deform compared to adjacent non-magnetic bodies and can exert an action of preventing thermal deformation on the adjacent non-magnetic bodies. In this regard, according to the configuration of 8) above, since the second recess is provided, the contact range in the radial direction between the buffer body portion and the adjacent pole piece is reduced, so that the action of preventing thermal deformation on the adjacent non-magnetic body can be suppressed. Therefore, the thermal strain of the adjacent non-magnetic body can be reduced.

[0088] 9) In some embodiments, the pole piece rotor described in 8) above, the second recess is configured such that its radial dimension increases as it approaches the adjacent pole piece in the circumferential direction.

[0089] According to the configuration of 9) above, the contact range in the radial direction between the buffer body portion and the adjacent pole piece can be further reduced.

[0090] 10) In some embodiments, the pole piece rotor described in any one of 5) to 9) above, The buffer hole portion penetrates the buffer main body portion in the axial direction.

[0091] According to the configuration of 10) above, the manufacturing process of forming the buffer hole portion in the buffer material can be simplified.

[0092] 11) In some embodiments, it is the pole piece rotor described in any one of 2) to 10) above, The buffer material is, It extends from the buffer main body portion along the circumferential direction to the side opposite to the adjacent pole piece side, and includes an intervening portion (54) sandwiched by the pair of non-magnetic divided portions.

[0093] According to the configuration of 11) above, the pair of non-magnetic divided portions can be joined via the intervening portion. Further, since the thermal strain of the non-magnetic divided portion can be reduced by the deformation of the intervening portion, breakage of the non-magnetic divided portion can be suppressed.

[0094] 12) In some embodiments, it is the pole piece rotor described in 11) above, Each of the non-magnetic divided portions is, a first non-magnetic contact surface (391) that contacts the first contact surface, and a second non-magnetic contact surface (392) that contacts the intervening portion, A non-magnetic connection surface (395), which is a part where the first non-magnetic contact surface and the second non-magnetic contact surface are connected, is a C surface or an R surface.

[0095] According to the configuration of 12) above, since the corners of the non-magnetic divided portion become C surfaces or R surfaces, concentration of thermal stress at the corners of the non-magnetic divided portion can be suppressed.

[0096] 13) In some embodiments, it is the pole piece rotor described in any one of 1) to 10) above, It further includes an adhesive layer (first adhesive layer 71) interposed between the adjacent non-magnetic body and the buffer material.

[0097] According to the configuration of 13) above, when the adjacent non-magnetic body undergoes thermal deformation, the adhesive layer deforms, so the thermal strain of the adjacent non-magnetic body can be suppressed. Thereby, even when a temperature change occurs, breakage of the adjacent non-magnetic body can be suppressed.

[0098] 14) In some embodiments, it is the pole piece rotor according to any one of 2) to 10) above, The pair of non-magnetic divided portions are arranged in the radial direction with a gap (non-magnetic hole 57) therebetween in an axial view.

[0099] According to the configuration of 14) above, it is also possible to use the gap between the pair of non-magnetic divided portions as a ventilation path. Therefore, thermal deformation of the non-magnetic divided portion can be suppressed.

[0100] 15) In some embodiments, it is the pole piece rotor according to any one of 1) to 14) above, The linear expansion coefficient of the cushioning material is larger than that of the adjacent pole piece and smaller than that of the plastic material.

[0101] According to the configuration of 15) above, when a temperature change occurs in the pole piece rotor, the cushioning material is more likely to undergo thermal deformation than the adjacent pole piece and less likely to undergo thermal deformation than the adjacent non-magnetic body. Thereby, the cushioning material can be appropriately deformed to allow thermal deformation of the adjacent non-magnetic body, and generation of high thermal stress in the adjacent non-magnetic body can be suppressed.

[0102] 16) The magnetic gear rotating machine (1) according to at least one embodiment of the present disclosure is The pole piece rotor (30) according to any one of 1) to 15) above, A magnet rotor (10) located radially inward with respect to the plurality of pole pieces and the plurality of non-magnetic bodies, A stator (20) located radially outside with respect to the plurality of pole pieces and the plurality of non-magnetic bodies and includes.

[0103] According to the configuration of the above (16), the same technical advantages as those of the above (1) can be obtained.

Explanation of Signs

[0104] 1: Magnetic gear rotating machine 9: External device 10: Magnet rotor 15: Rotor core 16: Electrical system 18: Rotating shaft 19: Magnet 20: Stator 22: Stator core 27: Stator coil 29: Stator magnet 30: Pole piece rotor 31: First connecting part 32: Second connecting part 33: Ring unit 35: Pole piece 36: Non-magnetic body 37: Adjacent pole piece 38: Adjacent non-magnetic body 39: Non-magnetic dividing part 42: Intermediate part 50: Buffer material 51: First contact surface 52: Second contact surface 53: Buffer main body part 54: Intervening part 56: Pole piece hole 57: Non-magnetic hole 59: Intermediate contact surface 60: Buffer hole part 61: First recess 62: Second recess 71: First adhesive layer (adhesive layer) 72: Second adhesive layer 73: Third adhesive layer 75: Fifth adhesive layer 81: First prepreg 82: Second prepreg 89: Prepreg 101: Pole piece end face 102: Pole piece recess 111: First terminal 332: Outer cover 339: Inner cover 391: First non-magnetic contact surface 392: Second non-magnetic contact surface 395: Non-magnetic connection surface B1: Bearing Cr: Non-magnetic center G1: Inner air gap G2: Outer air gap La, Lb: Dimensions M1: Dashed double lines S: Axis Sp, S2: Spaces

Claims

1. A plurality of magnetic pole pieces arranged at intervals in the circumferential direction, A plurality of non-magnetic bodies arranged alternately with the plurality of magnetic pole pieces in the circumferential direction, A magnetic pole piece rotor comprising: The plurality of magnetic pole pieces and the plurality of non-magnetic bodies each include adjacent magnetic pole pieces and adjacent non-magnetic bodies adjacent to each other, The magnetic pole piece rotor further includes a buffer material including a buffer main body portion sandwiched between the adjacent magnetic pole piece and the adjacent non-magnetic body, The material forming the adjacent non-magnetic body includes a plastic material, The Young's modulus of the buffer material is smaller than the Young's modulus of the plastic material Magnetic pole piece rotor.

2. The adjacent non-magnetic body includes a pair of non-magnetic divided portions arranged at intervals in the radial direction, The buffer main body portion has a pair of first contact surfaces respectively contacting the pair of non-magnetic divided portions The magnetic pole piece rotor according to claim 1.

3. Each of the pair of first contact surfaces is inclined with respect to the radial direction The magnetic pole piece rotor according to claim 2.

4. Defining the center of the adjacent non-magnetic body in the axial view as the non-magnetic center, Each of the pair of first contact surfaces is inclined so as to face the non-magnetic center side in the circumferential direction as it goes toward the non-magnetic center side in the radial direction The magnetic pole piece rotor according to claim 2 or 3.

5. The buffer material includes a buffer hole portion which is an opening or a hollow portion extending in the axial direction in the buffer main body portion The magnetic pole piece rotor according to claim 3.

6. Each of the pair of first contact surfaces has a first end on the non-magnetic center side which is the center of the adjacent non-magnetic body in the axial view, The buffer hole portion has a first recess recessed from the first end side toward the adjacent magnetic pole piece side in the circumferential direction The magnetic pole piece rotor according to claim 5.

7. The first recess is configured such that the radial dimension increases as it moves away from the first end in the circumferential direction The magnetic pole piece rotor according to claim 6.

8. The buffer main body portion has a second contact surface contacting the adjacent magnetic pole piece, The buffer material includes a buffer hole portion which is an opening or a hollow portion extending in the axial direction in the buffer main body portion, The buffer hole portion includes a second recess formed on the second contact surface The magnetic pole piece rotor according to claim 2 or 3.

9. The second recess is configured such that the radial dimension increases as it approaches the adjacent magnetic pole piece in the circumferential direction The magnetic pole piece rotor according to claim 8.

10. The buffer hole portion penetrates the buffer main body portion in the axial direction. The magnetic pole piece rotor according to claim 5.

11. The buffer material is extends from the buffer main body portion along the circumferential direction to the side opposite to the adjacent magnetic pole piece side, and includes an intervening portion sandwiched between the pair of non-magnetic divided portions. The magnetic pole piece rotor according to claim 2 or 3.

12. Each of the non-magnetic divided portions includes a first non-magnetic contact surface that contacts the first contact surface, and a second non-magnetic contact surface that contacts the intervening portion, and the non-magnetic connection surface, which is the portion where the first non-magnetic contact surface and the second non-magnetic contact surface are connected, is a C surface or an R surface. The magnetic pole piece rotor according to claim 11.

13. further includes an adhesive layer interposed between the adjacent non-magnetic body and the buffer material. The magnetic pole piece rotor according to any one of claims 1 to 3.

14. The pair of non-magnetic divided portions are arranged in the radial direction with a gap therebetween in an axial view. The magnetic pole piece rotor according to claim 2 or 3.

15. The linear expansion coefficient of the buffer material is larger than the linear expansion coefficient of the adjacent magnetic pole piece and smaller than the linear expansion coefficient of the plastic material. The magnetic pole piece rotor according to any one of claims 1 to 3.

16. The magnetic pole piece rotor according to any one of claims 1 to 3, a magnet rotor located radially inward with respect to the plurality of magnetic pole pieces and the plurality of non-magnetic bodies, and a stator located radially outward with respect to the plurality of magnetic pole pieces and the plurality of non-magnetic bodies A magnetic gear rotating machine comprising.

Images