Magnetic pole piece rotor and magnetic gear rotary machine

Abstract

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 alternately arranged with the plurality of magnetic pole pieces in the circumferential direction. The plurality of magnetic pole pieces and the plurality of non-magnetic bodies respectively include 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 member including a buffer main body portion held by the adjacent magnetic pole piece and the adjacent non-magnetic body. A material forming the adjacent non-magnetic body contains a plastic material. A Young's modulus of the buffer member is smaller than a Young's modulus of the plastic material.

Description

Technical Field

[0001] This disclosure relates to magnetic pole plate rotors and magnetic gear rotating machinery.

[0002] This application claims priority based on Japanese Patent Application No. 2023-200640 filed with the Japan Patent Office on November 28, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Previously, magnetic pole plate rotors incorporating magnetic gears for rotating machinery were known. Magnetic pole plate rotors comprise multiple magnetic pole plates and multiple non-magnetic bodies arranged alternately in the circumferential direction (see, for example, Patent Document 1).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2022 / 118598 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] Generally, non-magnetic materials are more susceptible to thermal deformation than magnetic pole pieces. In the aforementioned patent literature, a structure is used in which a non-magnetic material is sandwiched between two magnetic pole pieces in the circumferential direction. The thermal deformation of the non-magnetic material is limited by the two magnetic pole pieces. Therefore, when a temperature change occurs in the magnetic pole rotor, a large thermal strain is generated in the non-magnetic material, which may cause it to break.

[0009] The purpose of this disclosure is to provide a magnetic pole rotor and a magnetic gear rotating mechanism that can suppress the breakage of non-magnetic materials even when temperature changes occur.

[0010] Technical solutions for solving technical problems

[0011] The magnetic pole rotor of at least one embodiment of this disclosure comprises: a plurality of magnetic poles spaced apart in the circumferential direction; and a plurality of non-magnetic bodies arranged alternately with the plurality of magnetic poles in the circumferential direction, wherein the plurality of magnetic poles and the plurality of non-magnetic bodies respectively include adjacent magnetic poles and adjacent non-magnetic bodies, and the magnetic pole rotor further comprises a buffer member, the buffer member comprising a buffer body portion clamped by the adjacent magnetic poles and the adjacent non-magnetic bodies, wherein the material forming the adjacent non-magnetic bodies includes a plastic material, and the Young's modulus of the buffer member is less than the Young's modulus of the plastic material.

[0012] The magnetic gear rotating machine of at least one embodiment of the present disclosure includes: the above-described magnetic pole rotor; a magnetic rotor located radially inner relative to the plurality of magnetic poles and the plurality of non-magnetic bodies; and a stator located radially outer relative to the plurality of magnetic poles and the plurality of non-magnetic bodies.

[0013] Invention Effects

[0014] According to this disclosure, magnetic pole rotors and magnetic gear rotating machinery can be provided that can suppress the breakage of non-magnetic materials even when temperature changes occur. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a magnetic gear rotating machine according to one embodiment.

[0016] Figure 2 This is a schematic diagram of the internal structure of a magnetic gear rotating machine according to one embodiment.

[0017] Figure 3A This is a schematic diagram of the magnetic pole plate rotor of the first embodiment.

[0018] Figure 3B This is a schematic diagram of the magnetic pole plate rotor of the second embodiment.

[0019] Figure 3C This is a schematic diagram of the magnetic pole plate rotor of the third embodiment.

[0020] Figure 3D This is a schematic diagram of the magnetic pole plate rotor of the fourth embodiment.

[0021] Figure 3E This is a schematic diagram of the magnetic pole plate rotor of the fifth embodiment.

[0022] Figure 4 This is a schematic diagram of the buffer and adjacent non-magnetic body according to the fifth embodiment.

[0023] Figure 5 This is a schematic diagram showing a modified example of a buffer element.

[0024] Figure 6 This is a schematic diagram showing the adjacent nonmagnetic body in the modified example. Detailed Implementation

[0025] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the constituent 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.

[0026] For example, expressions such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" indicate a relative or absolute configuration, which not only strictly indicate such a configuration, but also indicate a state of relative displacement by an angle or distance with tolerance or to the extent that the same function can be obtained.

[0027] For example, terms like "same," "equal," and "homogeneous" indicate that things are equal, not only that they are strictly equal, but also that there is a difference in degree or tolerance that allows them to achieve the same function.

[0028] For example, the representation of shapes such as quadrilaterals and cylinders not only represents shapes in the strict geometric sense, but also includes shapes with concave and convex parts, chamfered parts, etc., within the range where the same effect can be achieved.

[0029] On the other hand, expressions such as "possessing," "containing," or "having" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0030] In addition, sometimes the same labels are used to label the same structures and the descriptions are omitted.

[0031] <Overview of Magnetic Gear Rotating Machinery 1>

[0032] Figure 1 This is a schematic diagram of a magnetic gear rotating machine 1 according to one embodiment of the present disclosure. In the following description, "axial direction" refers to the axial direction of the axis S of the magnetic gear rotating machine 1, "circumferential direction" refers to the circumferential direction based on the axis S, and "radial direction" refers to the radial direction based on the axis S. Furthermore, "outer radial direction" refers to the direction away from the axis S, and "inner radial direction" refers to the direction closer to the axis S.

[0033] The magnetic gear rotating mechanism 1 is connected to an external device 9 via a rotating shaft 18. The axis of the rotating shaft 18 is substantially aligned with the axis S. Figure 1 In order to simplify the drawings, the rotation shaft 18 is depicted as a solid shaft component, but this disclosure is not limited thereto. The rotation shaft 18 may be implemented by multiple shaft components, and the multiple shaft components may also include shaft components formed in a cylindrical shape.

[0034] The magnetic gear rotating machine 1 includes a magnetic rotor 10 connected to a rotating shaft 18 via a bearing B1. The magnetic 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 circumferentially within the rotor core 15. Additionally, each magnet 19 extends axially. Figure 1The illustrated magnet rotor 10 employs a surface permanent magnet (SPM) structure in which multiple magnets 19 are disposed on the surface of the rotor core 15, but this disclosure is not limited thereto. For example, an interior permanent magnet (IPM) structure in which multiple magnets 19 are embedded in the rotor core 15 may also be used (see [reference]). Figure 2 ).

[0035] The magnetic gear rotating mechanism 1 also includes a magnetic pole rotor 30 configured to rotate integrally with the rotating shaft 18. The magnetic pole rotor 30 includes: an annular unit 33 disposed radially outward from the magnetic rotor 10; a first connecting portion 31 connecting one axial end of the annular unit 33 to the rotating shaft 18; and a second connecting portion 32 connecting the other end of the annular unit 33 to the rotating shaft 18. Details of the annular unit 33 will be described later.

[0036] The magnetic gear rotating mechanism 1 also includes a stator 20 disposed radially outward from the annular unit 33. The stator 20 has a circumferentially extending stator core 22, a plurality of stator coils 27 disposed on the stator core 22, and a plurality of stator magnets 29 mounted on the inner circumferential 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 circumferentially (see reference). Figure 2 ).

[0037] Several methods can be used to mount the stator magnets 29 to the stator core 22. As a first method, each stator magnet 29 can also be mounted to the inner circumferential surface of the stator core 22 using an adhesive. As a second method, each stator magnet 29 can also be mounted to two finger-like members (or two protrusions) that project radially inward from the inner circumferential surface of the stator core 22. Alternatively, a combination of the first and second methods can be used.

[0038] Reference Figure 2 Example of an annular unit 33 of magnetic pole rotor 30. The annular unit 33 is radially opposite to the magnetic rotor 10 through an inner air gap G1, and radially opposite to the stator 20 through an outer air gap G2.

[0039] The annular unit 33 includes a plurality of magnetic pole pieces 35 and a plurality of non-magnetic bodies 36 arranged alternately in the circumferential direction, each magnetic pole piece 35 and each non-magnetic body 36 extending axially. Each magnetic pole piece 35 is realized by a plurality of electromagnetic steel plates stacked axially, one or more axially extending powder magnetic cores, or a combination thereof. Alternatively, at least one of the plurality of magnetic pole pieces 35 may have an axially open magnetic pole piece hole 56. The magnetic pole piece hole 56 can function as a ventilation path through which cooling air can pass, or as an insertion hole for inserting a support shaft supporting the magnetic pole piece 35.

[0040] The material forming the nonmagnetic body 36 includes a plastic material. For example, the nonmagnetic body 36 is formed from fiber-reinforced plastic (FRP). In this case, the nonmagnetic body 36 has a structure in which multiple prepregs 89 are stacked. The stacking direction of the prepregs 89 can be radial (see reference). Figure 3A It can also be circumferential (not shown). In addition, the non-magnetic body 36 preferably has not only non-magnetic properties, but also non-conductive properties.

[0041] The annular unit 33 may also include an inner cover 339 and an outer cover 332 that radially sandwich a plurality of magnetic pole pieces 35 and a plurality of non-magnetic bodies 36. The inner cover 339 and outer cover 332 are, for example, cylindrical components formed of a non-magnetic material such as FRP. However, this disclosure is not limited to this, and the inner cover 339 and outer cover 332 may not be provided. In this case, each magnetic pole piece 35 and each non-magnetic body 36 is exposed in the inner air gap G1 and the outer air gap G2, respectively.

[0042] return Figure 1 One embodiment of the magnetic gear rotating machine 1 is, for example, a magnetic gear generator configured to generate electricity from an input of power from an external device 9, which may also be a prime mover. Its operating principle is as follows: When the external device 9 drives the rotating shaft 18, the magnetic pole rotor 30 rotates. The relative positional relationship of the plurality of magnetic pole pieces 35 with respect to the plurality of magnets 19 and the plurality of stator magnets 29 changes, modulating the magnetic flux between the magnetic rotor 10 and the stator 20. When the magnets 19 are subjected to magnetic force from the modulated magnetic field and the magnetic rotor 10 rotates, a current is generated in the stator coil 27 through electromagnetic induction, supplying power from the stator coil 27 to the electrical system 16.

[0043] Another embodiment of the magnetic gear rotating machine 1 is a magnetic gear motor configured to output power to an external device 9 via a power supply from an electrical system 16. Its operating principle is as follows: the magnetic rotor 10 rotates due to a rotating magnetic field generated by the control of the current flowing through the stator coil 27. The relative positional relationship of the plurality of magnetic pole pieces 35 with respect to the plurality of magnets 19 and the plurality of stator magnets 29 changes, modulating the magnetic flux between the magnetic rotor 10 and the stator 20. The magnetic pole pieces 35 experience magnetic force from the modulated magnetic field, thereby rotating the magnetic pole rotor 30 and outputting power to the external device 9 from the rotating shaft 18. Furthermore, the external device 9 in this case could also be, for example, an electric vehicle, and the power output from the rotating shaft 18 could also be transmitted to the drive shaft of the electric vehicle.

[0044] exist Figure 1The example shown illustrates a structure where the rotating shaft 18 rotates together with the magnetic pole rotor 30, but the invention is not limited thereto. For example, a structure where the rotating shaft 18 rotates together with the magnetic rotor 10 can also be used. In this case, the magnetic pole rotor 30 is connected to the rotating shaft 18 via a bearing. Furthermore, the magnetic pole rotor 30 can also be configured to rotate together with a shaft component different from the rotating shaft 18. When other shaft components are connected to a device different from the external device 9, the magnetic gear rotating mechanism 1 can also transmit power output from other shaft components to that device.

[0045] <Magnetic pole rotor 30A~30E (30)>

[0046] Figures 3A-3E Several embodiments of magnetic pole piece rotors 30A to 30E (30) are shown. Before describing each embodiment in detail, the common structure of these embodiments will be described. In the following description, any two adjacent magnetic pole pieces 35 and non-magnetic bodies 36 arranged alternately in the circumferential direction will sometimes be referred to as "adjacent magnetic pole pieces 37" and "adjacent non-magnetic bodies 38". The adjacent non-magnetic bodies 38 are located between two magnetic pole pieces 35 that are circumferentially spaced apart.

[0047] The magnetic pole rotors 30A to 30E (30) include a buffer member 50. The buffer member 50 includes a buffer body portion 53 sandwiched between adjacent magnetic pole pieces 37 and adjacent non-magnetic bodies 38. The buffer member 50 extends axially. The buffer member 50 extends along the entire axial length of each of the adjacent magnetic pole pieces 37 and adjacent non-magnetic bodies 38 and is located between the adjacent magnetic pole pieces 37 and adjacent non-magnetic bodies 38. The buffer member 50 may be formed of a thermoplastic resin such as polyetherimide (PEI), polyamide (PA), or polypropylene (PP), or it may be formed of a thermoplastic elastomer or synthetic rubber. The material forming the adjacent non-magnetic body 38 (non-magnetic body 36) includes plastic materials as described above, but the plastic material and the material forming the buffer member 50 are different from each other.

[0048] The Young's modulus of the buffer 50 is less than that of the plastic material adjacent to the non-magnetic body 38. This relationship of Young's modulus holds true in both the circumferential and radial directions. More specifically, the circumferential Young's modulus of the buffer 50 is smaller than that of the plastic material adjacent to the non-magnetic body 38 in the circumferential direction, and the radial Young's modulus of the buffer 50 is also smaller than that of the plastic material adjacent to the non-magnetic body 38 in the radial direction.

[0049] Based on the above structure, the buffer 50 is more easily deformed than the adjacent non-magnetic body 38. Therefore, in the event of a temperature change in the magnetic pole rotor 30, the adjacent non-magnetic body 38 can deform the buffer 50 while simultaneously undergoing thermal deformation, thus reducing the thermal stress generated by the adjacent non-magnetic body 38. Therefore, a magnetic pole rotor 30 is achieved that can suppress damage to the non-magnetic body 36 even under temperature changes.

[0050] To give a more specific example, the magnetic pole rotor 30 has a thermoplastic adhesive (e.g., between the buffer 50 and the adjacent non-magnetic body 38) between it and the buffer element 50. Figure 3A In the case of the first adhesive layer 71 shown, a manufacturing process requires heating the annular unit 33 using equipment such as an autoclave. When the heated annular unit 33 cools, if the thermal contraction of the adjacent non-magnetic body 38 is hindered by the adjacent magnetic pole piece 37, the thermal strain of the adjacent non-magnetic body 38 increases, potentially causing breakage within the adjacent non-magnetic body 38. Regarding this, according to the above structure, at least a portion of the buffer member 50 deforms together with the adjacent non-magnetic body 38, reducing the thermal strain of the adjacent non-magnetic body 38. Therefore, breakage of the adjacent non-magnetic body 38 can be suppressed.

[0051] To give another specific example, when the magnetic gear rotating machine 1 is in operation, the temperature of the annular unit 33 rises due to the generation of eddy currents in the adjacent magnetic pole piece 37, etc. If the thermal expansion of the adjacent non-magnetic body 38 accompanying the temperature rise is hindered by the adjacent magnetic pole piece 37, the thermal strain of the adjacent non-magnetic body 38 will increase, and the adjacent non-magnetic body 38 may break. In this regard, according to the above structure, the deformation of the buffer member 50 reduces the thermal strain of the adjacent non-magnetic body 38, suppressing the breakage of the adjacent non-magnetic body 38.

[0052] Furthermore, the Young's modulus of the plastic material adjacent to the non-magnetic body 38 is smaller than that of the adjacent magnetic pole piece 37. This relationship of Young's modulus holds true in both the circumferential and radial directions.

[0053] The structure of each of the magnetic pole rotors 30A to 30E (30) will be described in detail below.

[0054] <Magnetic pole rotor 30A according to the first embodiment>

[0055] Figure 3AA schematic diagram showing the magnetic pole rotor 30A (30) of the first embodiment. The adjacent non-magnetic body 38A (38) of the magnetic pole rotor 30A (30) includes a pair of non-magnetic segments 39A (39) arranged radially spaced apart and an intermediate portion 42 connecting the circumferential ends of each non-magnetic segment 39A. The intermediate portion 42 is shorter than the non-magnetic segments 39A in the circumferential direction, and a non-magnetic hole 57 is formed on the side opposite to the adjacent magnetic pole 37A (37) relative to the intermediate portion 42. In other words, the pair of non-magnetic segments 39A are arranged radially apart from the non-magnetic hole 57 when viewed axially.

[0056] According to the above structure, the non-magnetic hole 57 can be used as a ventilation path for cooling air to pass through. Therefore, the temperature rise of the adjacent non-magnetic body 38 can be reduced, and the thermal deformation of the adjacent non-magnetic body 38A can be suppressed. In addition, the adjacent non-magnetic body 38A may not include the middle portion 42. In this case, the non-magnetic hole 57 is formed along the entire circumferential length of the adjacent non-magnetic body 38A. Alternatively, the non-magnetic hole 57 may function as an insertion hole for inserting a rod member supporting the adjacent non-magnetic body 38A, instead of functioning as a ventilation path. If it is a rod member and is cylindrical, the cylindrical hole formed on its inner side can function as a ventilation path.

[0057] Continuing with the description of the magnetic pole rotor 30A, the adjacent non-magnetic body 38A is formed by a plurality of prepregs 89 stacked radially. More specifically, the prepregs 89 have a plurality of first prepregs 81 forming the respective non-magnetic segments 39A and a plurality of second prepregs 82 forming the intermediate portion 42.

[0058] The buffer member 50A (50) of the magnetic pole rotor 30A includes a buffer body portion 53A (53). The buffer body portion 53A is plate-shaped with thickness in the circumferential direction. In addition, the buffer body portion 53 abuts against the adjacent non-magnetic body 38A along its entire radial length. More specifically, the buffer body portion 53A has a pair of first abutting surfaces 51A (51) that abut against a pair of non-magnetic segment portions 39A and an intermediate abutting surface 59 that abuts against the intermediate portion 42.

[0059] According to the above structure, the buffer member 50A can abut against each of the pair of non-magnetic segments 39A, thus allowing thermal deformation of each non-magnetic segment 39A. Therefore, breakage of each non-magnetic segment 39A can be suppressed. Furthermore, the adjacent non-magnetic body 38A may not include the intermediate portion 42. Even in this case, the above-mentioned technical advantages can still be obtained.

[0060] Continuing with the description of the magnetic pole rotor 30A. The magnetic pole rotor 30A has a first adhesive layer 71 between the adjacent non-magnetic body 38A and the buffer body portion 53A. The first contact surface 51A and the intermediate contact surface 59 are respectively abutted against the non-magnetic dividing portion 39A and the intermediate portion 42 via the first adhesive layer 71.

[0061] The magnetic pole rotor 30A also has a second adhesive layer 72, a third adhesive layer 73, and a fourth adhesive layer (not shown). The second adhesive layer 72 is located between the buffer body portion 53A and the adjacent magnetic pole piece 37A. The second adhesive layer 72 covers the entire radial length of both the buffer body portion 53A and the adjacent magnetic 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. Thus, the inner cover 339 and the outer cover 332 are respectively bonded to the adjacent magnetic pole piece 37A and the adjacent non-magnetic body 38A.

[0062] Since the magnetic pole rotor 30A has a first adhesive layer 71, the first adhesive layer 71 deforms when the adjacent non-magnetic body 38A undergoes thermal deformation, thus suppressing thermal strain on the adjacent non-magnetic body 38A. Therefore, even under temperature changes, damage to the adjacent non-magnetic body 38A can be suppressed. Furthermore, the aforementioned technical advantages can be achieved even if the adjacent magnetic pole 37A does not have the second adhesive layer 72, the third adhesive layer 73, and the fourth adhesive layer.

[0063] 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 magnetic pole rotors 30B to 30E, which will be described later. However, in Figures 3B to 3E For ease of observation of the accompanying drawings, illustrations of these adhesive layers have been omitted. These adhesive layers are not essential components of this disclosure.

[0064] Figure 3A The coefficient of linear expansion of the example buffer 50A (50) is greater than that of the adjacent magnetic pole piece 37A (37), and less than that of the plastic material forming the adjacent non-magnetic body 38A. For example, in the case of a structure in which prepreg 89 is stacked radially, the adjacent non-magnetic body 38A is prone to radial deformation. Therefore, it is preferable that the above-mentioned relationship of coefficients of linear expansion holds at least in the radial direction. That is, the radial coefficient of linear expansion of the buffer 50A is greater than that of the adjacent magnetic pole piece 37A, and less than that of the plastic material forming the adjacent non-magnetic body 38A. On the other hand, in the case of a structure in which prepreg 89 is stacked circumferentially (not shown), the adjacent non-magnetic body 38A is prone to deformation at least in the circumferential direction. Therefore, it is preferable that the above-mentioned relationship of coefficients of linear expansion holds in the circumferential direction.

[0065] Based on the above structure, in the event of a temperature change in the magnetic pole rotor 30A, the buffer 50A is more prone to thermal deformation than the adjacent magnetic pole 37A, but less prone to thermal deformation than the adjacent non-magnetic body 38A. Therefore, the buffer 50A can deform moderately in a manner that allows for thermal deformation of the adjacent non-magnetic body 38A, thereby suppressing the generation of high thermal stress in the adjacent non-magnetic body 38A.

[0066] <Magnetic pole rotor 30B of the second embodiment>

[0067] Figure 3B A schematic diagram showing the magnetic pole plate rotor 30B (30) of the second embodiment. Regarding the components of the second embodiment... Figure 3A The same constituent elements in the examples are sometimes omitted or simplified in their descriptions.

[0068] The buffer 50B (50) of the magnetic pole rotor 30B (30) includes a buffer body portion 53B (53). The buffer body portion 53B has a pair of first abutment surfaces 51B (51) that abut against a pair of non-magnetic partition portions 39B (39) of an adjacent non-magnetic body 38B (38). The first abutment surfaces 51B are inclined radially. As an example, the angle (acute angle) of the first abutment surfaces 51 inclined radially is 30° or more and 45° or less.

[0069] Due to the structure of the first contact surface 51B being inclined radially, even if the non-magnetic segment 39B undergoes thermal deformation in either the circumferential or radial direction, the buffer body 53B can deform accordingly. Therefore, damage to each of the non-magnetic segment 39B can be suppressed.

[0070] An example of the direction of inclination of the first abutment surface 51B will be explained. Figure 3B In the example, the center of the adjacent nonmagnetic body 38B (38) when viewed axially is defined as the nonmagnetic center Cr. The nonmagnetic center Cr is the center of the adjacent nonmagnetic body 38B (38) in both the circumferential and radial directions. A pair of first abutment surfaces 51B are inclined such that the side facing the nonmagnetic center Cr radially is more inclined towards the nonmagnetic center Cr in the circumferential direction.

[0071] According to the above structure, the further away from the non-magnetic center Cr in the radial direction, the longer the circumferential length of the non-magnetic segment 39B, and therefore the greater the amount of thermal deformation of the non-magnetic segment 39B in the circumferential direction. Even in this case, the buffer 50B can deform according to the thermal deformation of the non-magnetic segment 39B, thus suppressing the breakage of each non-magnetic segment 39B.

[0072] In addition, as mentioned above, the magnetic pole rotor 30B may also have a first adhesive layer 71 (see reference). Figure 3A) and second adhesive layer 72 (refer to) Figure 3A The first adhesive layer 71 is located between the first contact surface 51B and the non-magnetic dividing portion 39B, and the second adhesive layer 72 is located between the buffer body portion 53B and the adjacent magnetic pole piece 37.

[0073] <Magnetic Pole Rotor 30C of the Third Embodiment>

[0074] Figure 3C A schematic diagram showing the magnetic pole plate rotor 30C (30) of the third embodiment. Regarding the components of the third embodiment... Figure 3A , Figure 3B The same constituent elements in the examples are sometimes omitted or simplified in their descriptions.

[0075] The buffer 50C (50) of the magnetic pole rotor 30C (30) includes a buffer body 53C (53). The buffer body 53C is located between the adjacent non-magnetic body 38C (38) and the adjacent magnetic pole 37. The adjacent non-magnetic body 38C includes a pair of non-magnetic partitions 39C (39), but does not include the intermediate part 42 (see reference). Figure 3A ).

[0076] The buffer member 50C (50) includes a buffer hole portion 60C (60), which is an opening extending axially from the buffer body portion 53C. The buffer hole portion 60C axially penetrates the buffer body portion 53C. According to the above structure, the rigidity of the buffer body portion 53C is reduced, and therefore the buffer body portion 53C is more prone to deformation. Therefore, thermal strain in the non-magnetic segment portion 39C can be further reduced, and breakage of the non-magnetic segment portion 39C can be further suppressed. In addition, since the buffer hole portion 60C penetrates the buffer body portion 53C, the manufacturing process of forming the buffer hole portion 60C in the buffer member 50C can be simplified.

[0077] Continuing with the description of the magnetic pole rotor 30C. The buffer body 53C has a pair of first contact surfaces 51C (51) that abut against a pair of non-magnetic segmented portions 39C respectively. Each first contact surface 51C has a first end 111 on the non-magnetic center Cr side when viewed axially.

[0078] The buffer hole portion 60C has a first recess 61 that is recessed circumferentially from the first end 111 side toward the adjacent magnetic pole piece 37 side. As an example, the first recess 61 is configured such that the radial dimension (dimension La) increases the further circumferentially from the first end 111. However, this disclosure is not limited to this; for example, the first recess 61 may also be formed with the same radial dimension regardless of its circumferential position. In this case, the first recess 61 is rectangular when viewed axially.

[0079] Because the buffer hole portion 60C has a first recess 61, the buffer body portion 53C is particularly prone to deformation on the non-magnetic center Cr side. For example, the portion of the buffer body portion 53C located on the non-magnetic center Cr side, i.e., the first end 111, is prone to radial deformation. As a result, the thermal strain on the portion of the non-magnetic segment portion 39C on the non-magnetic center Cr side can be reduced, and damage to the non-magnetic segment portion 39C can be suppressed. As a more specific example, the portion of the non-magnetic segment portion 39C surrounded by the double-dotted line M1 can undergo thermal deformation in the circumferential or radial direction while pushing away the first end 111, thus reducing the thermal strain at that portion.

[0080] Furthermore, based on the structure that the first recess 61 is further away from the first end 111 in the circumferential direction and has a longer radial dimension (dimension La), the first recess 61 can be enlarged, thus further reducing the rigidity of the buffer body portion 53C. Therefore, the thermal strain of the non-magnetic segment 39C can be further reduced.

[0081] <Magnetic Pole Rotor 30D of the Fourth Embodiment>

[0082] Figure 3D A schematic diagram showing the magnetic pole plate rotor 30D (30) of the fourth embodiment. Regarding the components of the fourth embodiment... Figures 3A-3C The same constituent elements in the examples are sometimes omitted or simplified in their descriptions.

[0083] No non-magnetic hole 57 is provided on the adjacent non-magnetic body 38D (38) of the magnetic pole rotor 30D (30) (see reference). Figure 3A The fourth embodiment employs a solid structure of a full-length laminated prepreg 89 extending along the radial length of the adjacent nonmagnetic body 38D. However, the fourth embodiment is not limited to this; the adjacent nonmagnetic body 38D may also have a pair of nonmagnetic partitions 39A arranged with nonmagnetic holes 57 (see reference). Figure 3A ).

[0084] The magnetic pole rotor 30D (30) includes a buffer member 50D (50), which includes a buffer body portion 53D (53). The buffer body portion 53D has a second contact surface 52 that abuts against an adjacent magnetic pole 37D (37). The buffer hole portion 60D (60) includes a second recess 62 formed on the second contact surface 52. The second recess 62 extends axially through the buffer body portion 53D.

[0085] Additionally, the adjacent magnetic pole piece 37D (37) of the magnetic pole rotor 30D includes a magnetic pole end face 101 that abuts against the second abutment surface 52 and a magnetic pole recess 102 formed on the magnetic pole end face 101. In this example, the space Sp defined by the magnetic pole recess 102 communicates with the space S2 defined by the second recess 62.

[0086] The technical advantages of including the second recess 62 in the buffer hole portion 60D will be explained. Generally, the adjacent magnetic pole piece 37D is less prone to thermal deformation than the adjacent non-magnetic body 38D, and an effect that prevents thermal deformation can be applied to the adjacent non-magnetic body 38D. In this regard, according to the above structure, by providing the second recess 62, the radial contact range between the buffer body portion 53D and the adjacent magnetic pole piece 37D is reduced, thus suppressing the effect of preventing thermal deformation from affecting the adjacent non-magnetic body 38D. Therefore, the thermal strain of the adjacent non-magnetic body 38D can be reduced. Alternatively, the adjacent magnetic pole piece 37D may not include the magnetic pole piece recess 102. Even in this case, the above-mentioned technical advantages can still be obtained.

[0087] Figure 3D The second recess 62 shown in the example is configured such that the radial dimension (dimension Lb) increases the closer it is to the adjacent magnetic pole piece 37D in the circumferential direction. According to the above structure, the radial contact range between the buffer body portion 53D and the adjacent magnetic pole piece 37D can be further reduced.

[0088] <Magnetic Pole Rotor 30E of the Fifth Embodiment>

[0089] Figure 3E A schematic diagram showing the magnetic pole plate rotor 30E (30) of the fifth embodiment. Regarding the components of the fifth embodiment... Figures 3A to 3D The same constituent elements in the examples are sometimes omitted or simplified in their descriptions.

[0090] The buffer 50E (50) according to the fifth embodiment includes a buffer body portion 53E (53) and a clamping portion 54. The clamping portion 54 extends circumferentially from the buffer body portion 53E toward a side opposite to the adjacent magnetic pole piece 37. The clamping portion 54 and the buffer body portion 53E are integrally formed of the same material. The clamping portion 54 is held radially by a pair of non-magnetic partition portions 39E (39) adjacent to a non-magnetic body 38E (38). No non-magnetic hole 57 is formed in the adjacent non-magnetic body 38E (see reference). Figure 3A ).

[0091] According to the above structure, a pair of non-magnetic dividing portions 39E can be joined together via the clamping portion 54. In addition, the thermal strain of the non-magnetic dividing portions 39E can be reduced by the deformation of the clamping portion 54, thereby suppressing the breakage of the non-magnetic dividing portions 39E.

[0092] Figure 3EEach of the illustrated non-magnetic segment 39E includes a first non-magnetic abutment surface 391 that abuts against the first abutment surface 51E (51) of the buffer body portion 53E and a second non-magnetic abutment surface 392 that abuts against the clamping portion 54. The portion connecting the first non-magnetic abutment surface 391 and the second non-magnetic abutment surface 392, i.e., the non-magnetic connecting surface 395, is an R-surface. Alternatively, the non-magnetic connecting surface 395 may also be a C-surface (not shown).

[0093] According to the above structure, the corner of the non-magnetic dividing portion 39E becomes a C-surface or an R-surface, thus suppressing the concentration of thermal stress in the non-magnetic dividing portion 39E. Furthermore, the adhesive layer between the non-magnetic connecting surface 395 and the buffer member 50E can be made more elastic than the first adhesive layer 71 (see reference 50E). Figure 4 ) and the fifth adhesive layer 75 described later (refer to Figure 4 The thickness can prevent the concentration of thermal stress.

[0094] Figure 4 This is a schematic diagram showing a more specific configuration of the buffer 50E and the adjacent non-magnetic body 38E according to the fifth embodiment. In this diagram, the non-magnetic connection surface 395 (see reference) is omitted. Figure 3E The illustration is shown.

[0095] The buffer member 50E has a substantially symmetrical shape in the circumferential direction. More specifically, the buffer member 50E includes a pair of buffer body portions 53E arranged in a circumferential manner to clamp the clamping portion 54. Furthermore, the aforementioned first adhesive layer 71 is disposed between the buffer body portion 53E and the non-magnetic dividing portion 39E, and a fifth adhesive layer 75 is disposed between the clamping 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 member 50E and the adjacent non-magnetic body 38E are integrally formed. The first adhesive layer 71 and the fifth adhesive layer 75 may also be rubber-based adhesives or elastomer sheets.

[0096] <Other variations>

[0097] Figure 5 This is a schematic diagram showing a modified example of the buffer member 50. The buffer hole 60 of the buffer member 50 shown in this figure is a hollow portion extending axially inside the buffer body portion 53. Such a hollow portion can be formed if the buffer member 50 is a resin molded part. This structure can also be applied to… Figure 3C , Figure 3D The example buffer holes 60C and 60D.

[0098] Figure 6This is a schematic diagram showing the adjacent nonmagnetic body 38. The adjacent nonmagnetic body 38 can also be formed from a single resin component instead of an FRP structure. In this case, the adjacent nonmagnetic body 38 does not include multiple stacked prepregs 89. Furthermore, the buffer 50 can be disposed only on one side circumferentially relative to the adjacent nonmagnetic body 38. In this case, the technical advantage of reducing the thermal strain of the adjacent nonmagnetic body 38 can also be obtained.

[0099] Summary

[0100] The contents described in the above-described embodiments are as follows.

[0101] 1) A magnetic pole rotor (30) according to at least one embodiment of the present disclosure comprises: a plurality of magnetic pole pieces (35) spaced apart in the circumferential direction; a plurality of non-magnetic bodies (36) alternately arranged with the plurality of magnetic pole pieces in the circumferential direction, wherein the plurality of magnetic pole pieces and the plurality of non-magnetic bodies respectively include adjacent magnetic pole pieces (37) and adjacent non-magnetic bodies (38), the magnetic pole rotor further comprises a buffer member (50) including a buffer body portion (53) held by the adjacent magnetic pole pieces and the adjacent non-magnetic bodies, wherein the material forming the adjacent non-magnetic bodies includes a plastic material, and the Young's modulus of the buffer member is less than the Young's modulus of the plastic material.

[0102] Based on the structure described in 1) above, the buffer element is more easily deformed than the plastic material adjacent to the non-magnetic body. When a temperature change occurs in the magnetic pole rotor, the adjacent non-magnetic body can thermally deform both the buffer element and the adjacent non-magnetic body, thus reducing the thermal stress generated in the adjacent non-magnetic body. Therefore, a magnetic pole rotor is realized that can suppress damage to the non-magnetic body even under temperature changes.

[0103] 2) In several embodiments, in the magnetic pole rotor described in 1) above, the adjacent non-magnetic body includes a pair of non-magnetic segments (39) arranged radially spaced apart, and the buffer body has a pair of first contact surfaces (51) that abut against the pair of non-magnetic segments respectively.

[0104] According to the structure in 2) above, the buffer can abut against a pair of non-magnetic segments respectively, thus allowing thermal deformation of each non-magnetic segment. Therefore, it is possible to suppress breakage of each non-magnetic segment.

[0105] 3) In several embodiments, in the magnetic pole rotor described in 2) above, the pair of first contact surfaces are respectively inclined relative to the radial direction.

[0106] Based on the structure described in 3) above, even if the non-magnetic segment undergoes thermal deformation in either the circumferential or radial direction, the buffer body can deform accordingly. Therefore, damage to each non-magnetic segment can be suppressed.

[0107] 4) In several embodiments, in the magnetic pole rotor described in 2) or 3) above, the center of the adjacent non-magnetic body when viewed axially is defined as the non-magnetic center (Cr), and the pair of first abutment surfaces are inclined in a manner that they are further toward the non-magnetic center in the radial direction and further toward the non-magnetic center in the circumferential direction.

[0108] According to the structure described in 4) above, the circumferential length of each non-magnetic segment increases, thus increasing the circumferential thermal deformation of the non-magnetic segment. In this case, the buffer can also deform according to the thermal deformation of the non-magnetic segment, thereby suppressing the breakage of each non-magnetic segment.

[0109] 5) In several embodiments, in the magnetic pole rotor described in 3) or 4) above, the buffer includes a buffer hole (60), which is an opening or hollow portion extending axially in the buffer body portion.

[0110] Based on the structure described in 5) above, the rigidity of the buffer body is reduced, making it more prone to deformation. Therefore, thermal strain in the non-magnetic segment can be further reduced, and damage to the non-magnetic segment can be further suppressed.

[0111] 6) In several embodiments, in the magnetic pole rotor described in 5) above, the pair of first contact surfaces each have a first end (111) on the side of the nonmagnetic center (Cr) that serves as the center of the adjacent nonmagnetic body when viewed axially, and the buffer hole has a first recess (61) that is recessed in the circumferential direction from the first end side toward the side of the adjacent magnetic pole.

[0112] According to the structure described in 6) above, the buffer body is particularly prone to deformation on the non-magnetic center side. Therefore, thermal strain at the non-magnetic center side of the non-magnetic section can be reduced, and damage to the non-magnetic section can be suppressed.

[0113] 7) In several embodiments, in the magnetic pole rotor described in 6) above, the first recess is configured such that the radial dimension of the first end increases the further away it is from the first end in the circumferential direction.

[0114] Based on the structure described in 7) above, the first recess can be enlarged, thus further reducing the rigidity of the buffer body. Therefore, the thermal strain in the non-magnetic segment can be further reduced.

[0115] 8) In several embodiments, in any one of the magnetic pole rotors described in 2) to 7), the buffer body has a second contact surface (52) that abuts against the adjacent magnetic pole, and the buffer member includes an opening or hollow portion, i.e., a buffer hole portion (60), that extends axially in the buffer body, and the buffer hole portion includes a second recess (62) formed on the second contact surface.

[0116] Generally, adjacent magnetic pole pieces are less prone to thermal deformation than adjacent non-magnetic materials, thus preventing thermal deformation of the adjacent non-magnetic materials. Regarding this, according to the structure described in 8) above, by providing the second recess, the radial contact range between the buffer body and the adjacent magnetic pole piece is reduced, thereby suppressing the effect of preventing thermal deformation from affecting the adjacent non-magnetic material. Therefore, the thermal strain of the adjacent non-magnetic material can be reduced.

[0117] 9) In several embodiments, in the magnetic pole rotor described in 8) above, the second recess is configured such that the radial dimension is longer the closer it is to the adjacent magnetic pole in the circumferential direction.

[0118] Based on the structure described in 9), the radial contact range between the buffer body and the adjacent magnetic pole piece can be further reduced.

[0119] 10) In several embodiments, in any one of the magnetic pole plate rotors described in 5) to 9) above, the buffer hole extends axially through the buffer body portion.

[0120] Based on the structure of 10) above, the manufacturing process of forming the buffer hole in the buffer member can be simplified.

[0121] 11) In several embodiments, in any one of the magnetic pole rotors described in 2) to 10) above, the buffer includes a clamping portion (54) that extends from the buffer body portion circumferentially toward the side opposite to the adjacent magnetic pole side and is clamped by the pair of non-magnetic dividers.

[0122] According to the structure described in 11), a pair of non-magnetic dividing parts can be joined together via the clamping part. In addition, the thermal strain of the non-magnetic dividing parts can be reduced by the deformation of the clamping part, thereby suppressing the breakage of the non-magnetic dividing parts.

[0123] 12) In several embodiments, in the magnetic pole rotor described in 11) above, each non-magnetic segment includes a first non-magnetic contact surface (391) that abuts against the first contact surface and a second non-magnetic contact surface (392) that abuts against the clamping portion, and the non-magnetic connecting surface (395) at the part where the first non-magnetic contact surface and the second non-magnetic contact surface connect is a C surface or an R surface.

[0124] According to the structure in 12) above, the corner of the non-magnetic segment becomes a C-surface or an R-surface, thus suppressing the concentration of thermal stress at the corner of the non-magnetic segment.

[0125] 13) In several embodiments, the magnetic pole rotor described in any one of 1) to 10) above further includes an adhesive layer (first adhesive layer 71) between the adjacent non-magnetic body and the buffer member.

[0126] According to the structure described in 13), the adhesive layer deforms when the adjacent non-magnetic body undergoes thermal deformation, thus suppressing the thermal strain of the adjacent non-magnetic body. Therefore, even under temperature changes, damage to the adjacent non-magnetic body can be suppressed.

[0127] 14) In several embodiments, in any one of the magnetic pole rotors described in 2) to 10) above, the pair of non-magnetic segments are arranged radially with a gap (non-magnetic hole 57) when viewed axially.

[0128] According to the structure described in 14), the gap between a pair of non-magnetic segments can also be used as a ventilation path. Therefore, thermal deformation of the non-magnetic segments can be suppressed.

[0129] 15) In several embodiments, according to any one of the magnetic pole rotors described in 1) to 14), the coefficient of linear expansion of the buffer is greater than the coefficient of linear expansion of the adjacent magnetic pole and less than the coefficient of linear expansion of the plastic material.

[0130] According to the structure described in 15), when a temperature change occurs in the magnetic pole rotor, the buffer is more prone to thermal deformation than the adjacent magnetic pole and less prone to thermal deformation than the adjacent non-magnetic body. Therefore, the buffer can deform moderately in a manner that allows for thermal deformation of the adjacent non-magnetic body, thus suppressing the generation of high thermal stress in the adjacent non-magnetic body.

[0131] 16) A magnetic gear rotating machine (1) according to at least one embodiment of the present disclosure comprises: a magnetic pole rotor (30) as described in any one of 1) to 15) above; a magnet rotor (10) located radially inside the plurality of magnetic poles and the plurality of non-magnetic bodies; and a stator (20) located radially outside the plurality of magnetic poles and the plurality of non-magnetic bodies.

[0132] Based on the structure of 16) above, the same technical advantages as those of 1) above can be obtained.

[0133] Explanation of reference numerals in the attached figures

[0134] 1: Magnetic gear rotating machinery

[0135] 9: External devices

[0136] 10: Magnetic rotor

[0137] 15: Rotor core

[0138] 16: Electrical System

[0139] 18: Rotation axis

[0140] 19: Magnet

[0141] 20: Stator

[0142] 22: Stator core

[0143] 27: Stator coil

[0144] 29: Stator magnet

[0145] 30: Magnetic pole rotor

[0146] 31: First connecting section

[0147] 32: Second connecting section

[0148] 33: Ring unit

[0149] 35: Magnetic pole piece

[0150] 36: Non-magnetic body

[0151] 37: Adjacent magnetic pole pieces

[0152] 38: Adjacent nonmagnetic bodies

[0153] 39: Non-magnetic segment

[0154] 42: Middle section

[0155] 50: Buffer

[0156] 51: First contact surface

[0157] 52: Second contact surface

[0158] 53: Buffer Body

[0159] 54: Clamping section

[0160] 56: Magnetic pole plate hole

[0161] 57: Non-magnetic hole

[0162] 59: Middle contact surface

[0163] 60: Buffer hole section

[0164] 61: First recess

[0165] 62: Second recess

[0166] 71: First adhesive layer (adhesive layer)

[0167] 72: Second adhesive layer

[0168] 73: Third adhesive layer

[0169] 75: Fifth adhesive layer

[0170] 81: First prepreg

[0171] 82: Second prepreg

[0172] 89: Prepreg

[0173] 101: End face of magnetic pole piece

[0174] 102: Recessed part of magnetic pole piece

[0175] 111: First End

[0176] 332: Outer cover

[0177] 339: Inner cover

[0178] 391: First non-magnetic contact surface

[0179] 392: Second non-magnetic contact surface

[0180] 395: Non-magnetic bonding surface

[0181] B1: Bearing

[0182] Cr: Non-magnetic center

[0183] G1: Inner air gap

[0184] G2: Outer air gap

[0185] La, Lb: Size

[0186] M1: Double-dotted line

[0187] S: Axis

[0188] Sp, S2: Space

Claims

1. A magnetic pole rotor comprising: a plurality of magnetic poles spaced apart in a circumferential direction; and a plurality of non-magnetic bodies alternately arranged with the plurality of magnetic poles in the circumferential direction, characterized in that, The plurality of magnetic pole pieces and the plurality of non-magnetic bodies respectively include adjacent magnetic pole pieces and adjacent non-magnetic bodies that are adjacent to each other. The magnetic pole rotor also includes a buffer component, which comprises a buffer body portion held between the adjacent magnetic pole pieces and the adjacent non-magnetic body. The materials forming the adjacent nonmagnetic bodies include plastic materials. The Young's modulus of the buffer element is less than that of the plastic material.

2. The magnetic pole rotor according to claim 1, characterized in that, The adjacent nonmagnetic body includes a pair of nonmagnetic segments arranged radially spaced apart. The buffer body has a pair of first contact surfaces that abut against the pair of non-magnetic segments.

3. The magnetic pole rotor according to claim 2, characterized in that, The pair of first contact surfaces are respectively inclined relative to the radial direction.

4. The magnetic pole rotor according to claim 2 or 3, characterized in that, The nonmagnetic center is defined as the center of the adjacent nonmagnetic body when viewed from the axial direction. The pair of first abutting surfaces are inclined such that the more they face the non-magnetic center side in the radial direction, the more they face the non-magnetic center side in the circumferential direction.

5. The magnetic pole rotor according to claim 3, characterized in that, The buffer element includes an opening or hollow portion, i.e., a buffer hole, that extends axially in the buffer body.

6. The magnetic pole rotor according to claim 5, characterized in that, The pair of first abutting surfaces each have a first end that serves as the non-magnetic center side when viewed axially, which is the center of the adjacent non-magnetic body. The buffer hole has a first recess that is recessed in the circumferential direction from the first end side toward the adjacent magnetic pole piece side.

7. The magnetic pole rotor according to claim 6, characterized in that, The first recess is configured such that the radial dimension increases the further away from the first end in the circumferential direction.

8. The magnetic pole rotor according to claim 2 or 3, characterized in that, The buffer body has a second contact surface that abuts against the adjacent magnetic pole piece. The buffer element includes a buffer hole, which is an opening or hollow portion extending axially within the buffer body. The buffer hole includes a second recess formed on the second abutment surface.

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

10. The magnetic pole rotor according to claim 5, characterized in that, The buffer hole extends axially through the buffer body.

11. The magnetic pole rotor according to claim 2 or 3, characterized in that, The buffer includes a clamping portion that extends circumferentially from the buffer body to the side opposite to the adjacent magnetic pole piece and is clamped by the pair of non-magnetic dividers.

12. The magnetic pole plate rotor according to claim 11, characterized in that, Each non-magnetic segment includes a first non-magnetic abutting surface that abuts against the first abutting surface and a second non-magnetic abutting surface that abuts against the clamping portion. The non-magnetic connection surface, which is the part where the first non-magnetic contact surface and the second non-magnetic contact surface are connected, is either surface C or surface R.

13. The magnetic pole rotor according to any one of claims 1 to 3, characterized in that, It also has an adhesive layer between the adjacent non-magnetic body and the buffer.

14. The magnetic pole rotor according to claim 2 or 3, characterized in that, The pair of non-magnetic segments are arranged radially with a gap between them when viewed axially.

15. The magnetic pole rotor according to any one of claims 1 to 3, characterized in that, The coefficient of linear expansion of the buffer element is greater than that of the adjacent magnetic pole piece, but smaller than that of the plastic material.

16. A magnetic gear rotating mechanism, characterized in that, have: The magnetic pole rotor according to any one of claims 1 to 3; The magnetic rotor is located radially inside the plurality of magnetic pole pieces and the plurality of non-magnetic bodies. The stator is located on the outer side of the radial direction relative to the plurality of magnetic pole pieces and the plurality of non-magnetic bodies.

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