Magnetic gear motor and magnetic gear

Abstract

The invention provides a magnetic gear motor and a magnetic gear which can realize low cost. A magnetic gear motor (1) is provided with a stator (10), a first rotating body (20), a second rotating body (30), a support shaft (222), and a second bearing (52). The first rotating body (20) is provided with a cylindrical first rotor (21) and a first rotating shaft (22) with the axis (A1) as the rotating center. The second rotating body (30) has a second rotor (31) disposed between the first rotor (21) and the first rotating shaft (22). The support shaft (222) is disposed toward the axis of the first rotating shaft (22) when viewed from the second rotor (31). The second bearing (52) is disposed between the support shaft (222) and the second rotor (31).

Description

Technical Field

[0001] The present disclosure relates to magnetic gear motors and magnetic gears. Background Art

[0002] The magnetic gear motor is a motor that uses magnetic gears, and includes a stator, a high-speed rotor, and a low-speed rotor. The magnetic gears use high-order harmonic magnetic flux (for example, see Patent Document 1). The magnetic gear motor generates high-order harmonic magnetic flux by rotating the high-speed rotor using the magnetomotive force of the stator. As a result, the low-speed rotor having an output shaft rotates at a predetermined transmission ratio (reduction ratio).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5350438 Summary of the invention

[0006] In conventional magnetic gear motors, bearings for supporting the rotors are arranged outside each rotor, which increases the overall size of the magnetic gear motor and the diameter of the bearings, leading to increased costs.

[0007] The present disclosure has been made in view of the above-mentioned points, and an object of the present disclosure is to provide a magnetic gear motor and a magnetic gear that can achieve cost reduction.

[0008] A magnetic gear motor of one form of the present disclosure includes a stator, a first rotating body, a second rotating body, a support shaft, and a bearing. The first rotating body has a cylindrical first rotor and a rotating shaft with an axis as a rotation center. The second rotating body has a second rotor arranged between the first rotor and the axis of the rotating shaft. The support shaft is arranged toward the axis of the rotating shaft when viewed from the second rotor. The bearing is arranged between the support shaft and the second rotor.

[0009] A magnetic gear of one form of the present disclosure includes a stator, a first rotating body, a second rotating body, a support shaft, and a bearing. The first rotating body has a cylindrical first rotor and a rotating shaft with an axis as a rotation center. The second rotating body has a second rotor arranged between the first rotor and the axis of the rotating shaft. The support shaft is arranged toward the axis of the rotating shaft when viewed from the second rotor. The bearing is arranged between the support shaft and the second rotor.

[0010] According to the magnetic gear motor and the magnetic gear of one aspect of the present disclosure, cost reduction can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view of the magnetic gear motor according to the first embodiment.

[0012] Figure 2It is a longitudinal sectional view of the magnetic gear motor according to the first embodiment.

[0013] Figure 3 It is a schematic cross-sectional view of the magnetic gear motor according to the first embodiment.

[0014] Figure 4 It is a schematic cross-sectional view of a magnetic gear motor according to a second embodiment.

[0015] Figure 5 It is a schematic cross-sectional view of a magnetic gear motor according to a third embodiment.

[0016] Figure 6 It is a schematic cross-sectional view of a magnetic gear motor according to a fourth embodiment.

[0017] Figure 7 It is a schematic cross-sectional view of a magnetic gear motor according to a fifth embodiment.

[0018] Figure 8 It is a schematic cross-sectional view of a magnetic gear motor according to a sixth embodiment.

[0019] Fig. 9 It is a schematic cross-sectional view of a magnetic gear motor according to the seventh embodiment.

[0020] Fig.10 It is a schematic cross-sectional view of a magnetic gear motor according to an eighth embodiment.

[0021] Fig.11 It is a schematic cross-sectional view of a magnetic gear motor according to a ninth embodiment.

[0022] Fig.12 It is a schematic cross-sectional view of a magnetic gear according to the tenth embodiment. DETAILED DESCRIPTION

[0023] (Implementation Method)

[0024] Hereinafter, the magnetic gear motor and the magnetic gear of the embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. However, the figures described in the following embodiments are schematic diagrams, and the size and thickness ratios of the components may not necessarily reflect the actual size ratios. In addition, the structure described in the following embodiments is only an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made according to the design, etc. as long as the effects of the present disclosure can be achieved.

[0025] (First embodiment)

[0026] (1) Overall structure of magnetic gear motor

[0027] use Figure 1 to Figure 3 Next, a magnetic gear motor 1 according to a first embodiment will be described. Figure 1It is a perspective view of the magnetic gear motor 1 according to the first embodiment. Figure 2 It is a longitudinal sectional view of the magnetic gear motor 1 according to the first embodiment. Figure 3 1 is a schematic cross-sectional view of a magnetic gear motor 1 according to the first embodiment. The magnetic gear motor 1 is a permanent magnet synchronous motor, and is driven by, for example, an inverter. The magnetic gear motor 1 includes a stator 10 , a first rotating body 20 , and a second rotating body 30 .

[0028] The magnetic gear motor 1 further includes a housing 40, a first bearing 51, a second bearing 52, and a third bearing 53. The housing 40 is a casing for accommodating the stator 10, the first rotating body 20, and the second rotating body 30, and constitutes the outline of the magnetic gear motor 1. The first bearing 51, the second bearing 52, and the third bearing 53 are ball bearings.

[0029] The magnetic gear motor 1 is an inner rotor type motor in which the first rotating body 20 and the second rotating body 30 are arranged radially inside the stator 10. That is, the stator 10 is arranged so as to surround the first rotating body 20 and the second rotating body 30. In addition, the "radial direction" is defined as the direction extending from a point corresponding to the axis of the first rotating shaft 22 (discussed later) of the first rotating body 20, and a point located in a direction passing through the point and perpendicular to the axis of the first rotating shaft 22 and separated from the first rotating shaft 22, in a plane whose normal line is a straight line that coincides with the axis of the first rotating shaft 22 (discussed later). In addition, "radially inside" is defined as a direction from a point separated from the first rotating shaft 22 toward the axis of the first rotating shaft 22. "Radially outside" is defined as a direction from a point separated from the first rotating shaft 22 toward the side opposite to the axis of the first rotating shaft 22.

[0030] The stator 10, the first rotating body 20 and the second rotating body 30 are coaxially arranged. That is, the center of the stator 10, the axis of the first rotating shaft 22 of the first rotating body 20 and the axis of the second rotating shaft 32 of the second rotating body 30 are consistent. Figure 2 and Figure 3 Therefore, the rotation center of the first rotating body 20 and the rotation center of the second rotating body 30 coincide with each other.

[0031] (2) Stator

[0032] The stator 10 generates a magnetic force acting on the first rotating body 20 and the second rotating body 30. Specifically, the stator 10 is configured so that the N pole and the S pole appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30. In addition, the "circumferential direction" refers to a direction defined as a direction along the circumference of a circle centered at a point corresponding to the axis A1 of the first rotating shaft 22 of the first rotating body 20 in a plane whose normal line is a straight line that coincides with the axis A1 of the first rotating shaft 22 of the first rotating body 20.

[0033] The stator 10 in this embodiment includes: a stator core 11 having a plurality of teeth 15 and a yoke 16; a plurality of coils 12 wound around the plurality of teeth 15; and a plurality of permanent magnets 13. The stator core 11 is a stator iron core that serves as the core of the stator 10. The stator core 11 is, for example, a stacked body in which a plurality of electromagnetic steel plates are stacked in the axial direction extending from the axis A1 of the first rotating shaft 22 of the first rotating body 20. In addition, the stator core 11 is not limited to a stacked body of a plurality of steel plates, but may also be a block formed of a magnetic material. In addition, hereinafter, the stator core 11 will be described in detail. Figure 2 The paper is facing upward and from the Figure 3 The left-to-right direction of the paper is set as the first side of the axis direction, and the Figure 2 The paper is facing downward and from Figure 3 The direction from right to left on the paper is set as the second side of the axial direction.

[0034] The coil 12 is a winding coil as an armature winding of the stator 10, and the conductive wire is wound in such a manner that a magnetic flux acting on the second rotating body 30 is generated by the flow of current. The plurality of coils 12 correspond to the plurality of teeth 15 in a one-to-one manner, and each coil 12 is, for example, a concentrated winding coil wound around the corresponding tooth 15. In addition, the coil 12 is a three-phase winding in such a manner that the first rotating body 20 can be rotated by setting it as a three-phase synchronous motor.

[0035] Each permanent magnet 13 is arranged radially inward of each coil 12 on the inner peripheral surface of the stator 10. The permanent magnet 13 is arranged across two adjacent teeth 15. The permanent magnet 13 is magnetized so that the magnetic pole direction is in the radial direction of the stator 10. The permanent magnet 13 is, for example, a sintered magnet.

[0036] (3) First rotating body

[0037] The first rotating body 20 includes a cylindrical first rotor 21 and a first rotating shaft 22 .

[0038] The first rotor 21 is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25 and a plurality of pole shoes 26. The frame 25 includes a disk-shaped bottom 251 having an opening formed in the center, and a cylindrical portion 252 extending from the outer peripheral edge of the bottom 251 toward the first side in the axial direction. The plurality of pole shoes 26 are magnetic pole pieces formed of a magnetic material. The plurality of pole shoes 26 are inserted into the notches of the cylindrical portion 252 of the frame 25 and are fixed by molding with a molding resin 27.

[0039] The plurality of pole shoes 26 are arranged in a ring shape along the circumferential direction of the second rotating body 30. The plurality of pole shoes 26 are respectively long strip-shaped magnetic components formed of magnetic material. The plurality of pole shoes 26 are respectively stacked bodies formed by stacking a plurality of steel plates. In addition, the pole shoes 26 are not limited to stacked bodies of a plurality of steel plates, but may also be blocks formed of magnetic material.

[0040] The plurality of pole shoes 26 radially oppose the permanent magnets 34 (described later) of the second rotating body 30 , and also radially oppose the plurality of teeth 15 and the plurality of permanent magnets 13 of the stator 10 .

[0041] The first rotating shaft 22 functions as an output shaft, and includes a main body 221 and a support shaft 222. The support shaft 222 extends from the main body 221 toward a first side in the axial direction, and enters the radially inner side of the second rotor 31 (described later).

[0042] The first rotor 21 is fixed to the first rotating shaft 22. Specifically, the inner peripheral end of the bottom 251 of the frame 25 is fixed to the main body 221 of the first rotating shaft 22 by the screw 23. In the above-described structure, the first rotor 21 is cantilevered on the first rotating shaft 22. Therefore, for example, the assembly of the first rotating body 20 and the second rotating body 30 becomes easy.

[0043] (4) Second rotating body

[0044] The second rotating body 30 includes a cylindrical second rotor 31 disposed radially inside the first rotor 21 , and a second rotating shaft 32 coaxial with the first rotating shaft 22 .

[0045] The second rotor 31 functions as a high-speed rotor, and includes a rotor core 33 and a plurality of permanent magnets 34 .

[0046] The rotor core 33 is a rotor iron core that becomes the core of the second rotor 31, and is, for example, a laminated body formed by laminating a plurality of electromagnetic steel sheets in the axial direction of the second rotating shaft 32. In addition, the rotor core 33 is not limited to a laminated body of electromagnetic steel sheets, but may also be a block formed of a magnetic material. The rotor core 33 is cylindrical and has an internal space 61.

[0047] A plurality of permanent magnets 34 are provided on the rotor core 33. The second rotor 31 is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34 are provided on the outer peripheral side of the rotor core 33. Specifically, the plurality of permanent magnets 34 are continuously arranged in the circumferential direction so as to cover the entire outer peripheral side of the rotor core 33. The plurality of permanent magnets 34 are magnetized in such a manner that the magnetic pole direction becomes the radial direction of the second rotor 31, and are arranged in such a manner that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33.

[0048] The second rotating shaft 32 is a rod-shaped shaft, and is fixed to the second rotor 31. Specifically, Figure 2 As shown, the second rotating shaft 32 is fixed to one axial end surface of the second rotor 31 by means of a screw 35. Figure 2 and Figure 3 In the embodiment, the second rotating shaft 32 is arranged on the first side in the axial direction with respect to the first rotating shaft 22 .

[0049] The stator 10, the first rotor 21 of the first rotating body 20, and the second rotor 31 of the second rotating body 30 are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10 and the first rotor 21 of the first rotating body 20, and there is also an air gap between the first rotor 21 of the first rotating body 20 and the second rotor 31 of the second rotating body 30.

[0050] In addition, the rotation speed of the second rotating shaft 32 may be detected by a sensor.

[0051] (5) Cabinet

[0052] The housing 40 is composed of a plurality of parts. Specifically, the housing 40 includes a cylindrical portion 41 , a first bracket 42 , and a second bracket 43 .

[0053] The first holder 42 is disposed so as to close the opening on one side of the tube portion 41. The first holder 42 is provided with a third bearing holding portion 421 for holding the third bearing 53.

[0054] The second holder 43 is disposed so as to close the other opening of the tube portion 41. The second holder 43 is provided with a first bearing holding portion 431 for holding the first bearing 51.

[0055] The cylinder 41, the first bracket 42, and the second bracket 43 are formed of, for example, a metal material, or may be formed of a resin material. In addition, the cylinder 41, the first bracket 42, and the second bracket 43 may be formed of the same material or different materials.

[0056] (6) Bearings

[0057] The first rotating body 20 and the second rotating body 30 are coaxially configured to be rotatable independently of each other.

[0058] The first bearing 51 is disposed between the first bearing holding portion 431 of the second holder 43 and the main body portion 221 of the first rotating shaft 22 .

[0059] The second bearing 52 is arranged between the support shaft 222 of the first rotating shaft 22 and the second rotor 31 in the internal space 61 of the rotor core 33. The second bearing 52 is a double bearing type, and has a first small bearing 54 and a second small bearing 55. The first small bearing 54 and the second small bearing 55 are of the same size, and have a smaller diameter than the first bearing 51 and the third bearing 53. The first small bearing 54 and the second small bearing 55 are arranged separately from each other along the axial direction of the support shaft 222 of the first rotating shaft 22. In addition, the second small bearing 55 may be smaller than the first small bearing 54.

[0060] The third bearing 53 is disposed between the inner peripheral surface of the third bearing holding portion 421 of the first holder 42 and the outer peripheral surface of the second rotating shaft 32 .

[0061] The first bearing 51 , the second bearing 52 , and the third bearing 53 are ball bearings, but are not limited thereto as long as they can rotatably support the first rotating shaft 22 and the second rotating shaft 32 .

[0062] (7) Operation of magnetic gear motor

[0063] When the alternating current from the converter is energized to the coil 12 of the stator 10, an excitation current flows to the coil 12, and a magnetic flux is generated in the stator 10 according to the current control phase. Then, the magnetic force generated by the interaction between the magnetic flux generated in the stator 10 and the magnetic flux generated by the permanent magnet 34 of the second rotating body 30 becomes a torque that rotates the second rotating body 30, and the second rotating body 30 rotates. At this time, the magnetic flux generated from the second rotating body 30 is modulated by the pole piece 26 of the first rotating body 20, so that a high-order harmonic magnetic flux is generated between the first rotating body 20 and the stator 10. As a result, the first rotating body 20 is decelerated according to a predetermined transmission ratio (reduction ratio) and rotates with high torque.

[0064] (8) Effect

[0065] As described above, the second bearing 52 is arranged radially inward of the second rotor 31. Therefore, a bearing with a small diameter can be used as the second bearing 52, and cost reduction can be achieved.

[0066] In particular, the second bearing 52 , which is one of the bearings supporting the second rotor 31 , which is the most radially inner rotor, is arranged radially inward of the second rotor 31 . Therefore, a small-diameter bearing can be used as the second bearing 52 , thereby achieving cost reduction.

[0067] Furthermore, by configuring the second bearing 52 as the first small bearing 54 and the second small bearing 55, it is possible to ensure high bending rigidity between the first rotating shaft 22 and the rotor core 33. Therefore, the number of bearings between the first rotating shaft and the housing, which conventionally required two, can be reduced to one (specifically, in the present embodiment, the first bearing 51 is one), and as a result, the overall axial length of the magnetic gear motor 1 can be shortened.

[0068] (Second embodiment)

[0069] In the first embodiment, the magnetic gear motor 1 includes the second rotating shaft 32 , but the second rotating shaft may be omitted.

[0070] use Figure 4 Such an example will be described as a second embodiment. Figure 4It is a schematic cross-sectional view of a magnetic gear motor 1A according to the second embodiment. The basic structure and basic functions of the second embodiment are the same as those of the first embodiment, and therefore the description will be centered around the differences (hereinafter, the same applies to other embodiments).

[0071] (1) Overall structure of magnetic gear motor

[0072] The magnetic gear motor 1A includes a stator 10A, a first rotating body 20A, and a second rotating body 30A.

[0073] The magnetic gear motor 1A further includes a housing 40A, a first bearing 51A, a second bearing 52A, and a third bearing 53A. The housing 40A is a housing for housing the stator 10A, the first rotating body 20A, and the second rotating body 30A, and forms the outline of the magnetic gear motor 1A. The first bearing 51A, the second bearing 52A, and the third bearing 53A are ball bearings.

[0074] (2) Stator

[0075] The stator 10A generates magnetic force acting on the first rotating body 20A and the second rotating body 30A. Specifically, the stator 10A is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30A.

[0076] The stator 10A in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11A including a plurality of teeth and a yoke, a plurality of coils 12A wound around the plurality of teeth, and a plurality of permanent magnets.

[0077] (3) First rotating body

[0078] The first rotating body 20A includes a cylindrical first rotor 21A and a first rotating shaft 22A.

[0079] The first rotor 21A is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25A and a plurality of pole shoes 26A. The frame 25A includes: a disc-shaped bottom 251A having an opening formed in the center; and a cylindrical portion 252A extending from the outer peripheral edge of the bottom 251A toward the first side in the axial direction. The plurality of pole shoes 26A are magnetic pole pieces formed of a magnetic material. The plurality of pole shoes 26A are inserted into the notches of the cylindrical portion 252A of the frame 25A and are fixed by molding with a molding resin.

[0080] The plurality of pole pieces 26A are arranged in a ring shape along the circumferential direction of the second rotating body 30A.

[0081] The plurality of pole shoes 26A radially oppose the permanent magnets 34A (described later) of the second rotating body 30A, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10A.

[0082] The first rotating shaft 22A functions as an output shaft and includes a main body 221A and a support shaft 222A. The support shaft 222A extends from the main body 221A toward the first side in the axial direction and enters the radially inner side of the second rotor 31A (described later). The support shaft 222A of the first rotating shaft 22A is different from the support shaft 222 of the first embodiment (see Figure 3 ) further extends longer toward the first side in the axial direction.

[0083] The first rotor 21A is fixed to the first rotating shaft 22A. Specifically, the inner peripheral end of the bottom 251A of the frame 25A is fixed to the main body 221A of the first rotating shaft 22A by screws. In the above-described structure, the first rotor 21A is cantilevered on the first rotating shaft 22A. Therefore, for example, the first rotating body 20A and the second rotating body 30A can be easily assembled.

[0084] (4) Second rotating body

[0085] The second rotating body 30A includes a cylindrical second rotor 31A disposed radially inside the first rotor 21A.

[0086] The second rotor 31 functions as a high-speed rotor, and includes a rotor core 33A and a plurality of permanent magnets 34A.

[0087] The rotor core 33A is a rotor core that serves as the core of the second rotor 31A. The rotor core 33A has a cylindrical shape and has an internal space 61A.

[0088] A plurality of permanent magnets 34A are provided on the rotor core 33A. The second rotor 31A is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34A are provided on the outer peripheral side of the rotor core 33A. Specifically, the plurality of permanent magnets 34A are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33A. The plurality of permanent magnets 34A are magnetized in a manner that the magnetic pole direction becomes the radial direction of the second rotor 31A, and are arranged in a manner that the N pole and the S pole exist alternately and evenly along the circumferential direction of the rotor core 33A.

[0089] The stator 10A, the first rotor 21A of the first rotating body 20A, and the second rotor 31A of the second rotating body 30A are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10A and the first rotor 21A of the first rotating body 20A, and there is also an air gap between the first rotor 21A of the first rotating body 20A and the second rotor 31A of the second rotating body 30A.

[0090] (5) Cabinet

[0091] The housing 40A is composed of a plurality of parts. Specifically, the housing 40 includes a cylindrical portion 41A, a first bracket 42A, and a second bracket 43A.

[0092] The first holder 42A is disposed so as to close the opening on one side of the cylindrical portion 41A. The first holder 42A is provided with a third bearing holding portion 421A for holding the third bearing 53A.

[0093] The second holder 43A is disposed so as to close the other opening of the cylindrical portion 41A. The second holder 43A is provided with a first bearing holding portion 431A for holding the first bearing 51A.

[0094] (6) Bearings

[0095] The first rotating body 20A and the second rotating body 30A are coaxially configured to be rotatable independently of each other.

[0096] The first bearing 51A is disposed between the first bearing holding portion 431A of the second bracket 43A and the main body portion 221A of the first rotating shaft 22A. The third bearing 53A is disposed between the third bearing holding portion 421A of the first bracket 42A and the top end of the support shaft 222A of the first rotating shaft 22A. That is, the top end of the support shaft 222A is rotatably supported by the housing 40A via the third bearing 53A.

[0097] The second bearing 52A is arranged between the support shaft 222A of the first rotating shaft 22A and the second rotor 31A in the internal space 61A of the rotor core 33A. The second bearing 52A is a double bearing type, and has a first small bearing 54A and a second small bearing 55A. The first small bearing 54A and the second small bearing 55A are of the same size, and each has a smaller diameter than the diameter of the first bearing 51A. The first small bearing 54A and the second small bearing 55A are arranged separately from each other along the axial direction of the support shaft 222A of the first rotating shaft 22A. In addition, the first small bearing 54A and the second small bearing 55A may not be of the same size.

[0098] As described above, in the magnetic gear motor 1A, the second rotating shaft 32 (see Figure 3 ), the second rotor 31A is composed of a cylindrical rotor core 33A and a plurality of permanent magnets 34A. In addition, the support shaft 222A of the first rotating shaft 22A is further extended to the first side in the axial direction than the support shaft 222 of the first embodiment and is embedded in the radial inner side of the third bearing 53A. That is, the top end of the support shaft 222A is rotatably supported by the housing 40A via the third bearing 53A.

[0099] (7) Effect

[0100] In this embodiment as well, the second bearing 52A is arranged radially inward of the second rotor 31A, and therefore, the same effects as those of the first embodiment can be obtained.

[0101] (Third embodiment)

[0102] In the first and second embodiments, the second bearings (52, 52A) of the magnetic gear motor (1, 1A) are double bearings, but the number of the second bearings may be one.

[0103] use Figure 5 Such an example will be described as a third embodiment. Figure 5 It is a schematic cross-sectional view of a magnetic gear motor 1B according to the third embodiment.

[0104] (1) Overall structure of magnetic gear motor

[0105] The magnetic gear motor 1B includes a stator 10B, a first rotating body 20B, and a second rotating body 30B.

[0106] The magnetic gear motor 1B further includes a housing 40B, a first bearing 51B, a second bearing 52B, and a third bearing 53B. The housing 40B is a casing for accommodating the stator 10B, the first rotating body 20B, and the second rotating body 30B, and constitutes the outline of the magnetic gear motor 1B. The first bearing 51B, the second bearing 52B, and the third bearing 53B are ball bearings.

[0107] (2) Stator

[0108] The stator 10B generates magnetic force acting on the first rotating body 20B and the second rotating body 30B. Specifically, the stator 10B is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30B.

[0109] The stator 10B in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11B having a plurality of teeth and a yoke, a plurality of coils 12B wound around the plurality of teeth, and a plurality of permanent magnets.

[0110] (3) First rotating body

[0111] The first rotating body 20B includes a cylindrical first rotor 21B and a first rotating shaft 22B.

[0112] The first rotor 21B is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25B and a plurality of pole shoes 26B. The frame 25B includes: a disc-shaped bottom 251B having an opening formed in the center; and a cylindrical portion 252B extending from the outer peripheral edge of the bottom 251B toward the first side in the axial direction. The plurality of pole shoes 26B are magnetic pole pieces formed of a magnetic material. The plurality of pole shoes 26B are inserted into the notches of the cylindrical portion 252B of the frame 25B and are fixed by molding with a molding resin.

[0113] The plurality of pole pieces 26B are arranged in a ring shape along the circumferential direction of the second rotating body 30B.

[0114] The plurality of pole shoes 26B radially oppose the permanent magnets 34B (described later) of the second rotating body 30B, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10B.

[0115] The first rotating shaft 22B functions as an output shaft and includes a main body 221B and a support shaft 222B. The support shaft 222B extends from the main body 221B toward the first side in the axial direction and enters the radially inner side of the second rotor 31B (described later).

[0116] The first rotor 21B is fixed to the first rotating shaft 22B. Specifically, the inner peripheral end of the bottom 251B of the frame 25B is fixed to the main body 221B of the first rotating shaft 22B by screws. In the above-described structure, the first rotor 21B is cantilevered on the first rotating shaft 22B. Therefore, for example, the assembly of the first rotating body 20B and the second rotating body 30B becomes easy.

[0117] (4) Second rotating body

[0118] The second rotating body 30B includes a cylindrical second rotor 31B arranged radially inward of the first rotor 21B.

[0119] The second rotor 31 functions as a high-speed rotor, and includes a rotor core 33B and a plurality of permanent magnets 34B.

[0120] The rotor core 33B is a rotor core that serves as the core of the second rotor 31B. The rotor core 33B has a cylindrical shape and has an internal space 61B.

[0121] A plurality of permanent magnets 34B are provided on the rotor core 33B. The second rotor 31B is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34B are provided on the outer peripheral side of the rotor core 33B. Specifically, a plurality of permanent magnets 34B are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33B. The plurality of permanent magnets 34B are magnetized in a manner that the magnetic pole direction becomes the radial direction of the second rotor 31B, and are arranged in a manner that the N pole and the S pole exist alternately and evenly along the circumferential direction of the rotor core 33B.

[0122] The stator 10B, the first rotor 21B of the first rotating body 20B, and the second rotor 31B of the second rotating body 30B are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10B and the first rotor 21B of the first rotating body 20B, and there is also an air gap between the first rotor 21B of the first rotating body 20B and the second rotor 31B of the second rotating body 30B.

[0123] (5) Cabinet

[0124] The housing 40B is composed of a plurality of parts. Specifically, the housing 40B includes a cylindrical portion 41B, a first bracket 42B, and a second bracket 43B.

[0125] The first holder 42B is arranged so as to close the opening on one side of the tube portion 41B. The first holder 42B is provided with a third bearing holding portion 421B for holding the third bearing 53B.

[0126] The second holder 43B is arranged so as to close the opening on the other side of the tube portion 41B. The second holder 43B is provided with a first bearing holding portion 431B for holding the first bearing 51B.

[0127] (6) Bearings

[0128] The first rotating body 20B and the second rotating body 30B are coaxially configured to be rotatable independently of each other.

[0129] The first bearing 51B is disposed between the first bearing holding portion 431B of the second bracket 43B and the main body portion 221B of the first rotating shaft 22B. In addition, in the present embodiment, in addition to the first bearing 51B, a fifth bearing 56B is disposed between the first bearing holding portion 431B of the second bracket 43B and the main body portion 221B of the first rotating shaft 22B.

[0130] The second bearing 52B is disposed between the support shaft 222B of the first rotating shaft 22B and the second rotor 31B in the internal space 61B of the rotor core 33B.

[0131] like Figure 5 As shown in FIG. 1 , in the magnetic gear motor 1B, there is one second bearing 52B, which is arranged radially inward of the second rotor 31B. Specifically, the rotor core 33B of the second rotor 31B includes a first portion 331B supported by the second rotating shaft 32B and a second portion 332B extending from the first portion 331B to the second side in the axial direction. The second portion 332B has an inner diameter longer than that of the first portion 331B and has an inner space 61B, so that a gap 62B is ensured between the inner peripheral surface of the second portion 332B and the outer peripheral surface of the support shaft 222B. The second bearing 52B is arranged between the support shaft 222B of the first rotating shaft 22B and the second portion 332B of the rotor core 33B in the inner space 61B of the second portion 332B.

[0132] The third bearing 53B is disposed between the third bearing holding portion 421B of the first holder 42B and the second rotating shaft 32B.

[0133] (7) Effect

[0134] In this embodiment as well, the second bearing 52B is arranged radially inward of the second rotor 31B. Therefore, the same effects as those of the first embodiment can be obtained with respect to the reduction in radial size of the magnetic gear motor 1B.

[0135] (Fourth embodiment)

[0136] In the first embodiment, the first rotor 21 is cantilever-supported by the first rotating shaft 22 , but the first rotor may be supported at both ends by the first rotating shaft.

[0137] use Figure 6 Such an example will be described as a fourth embodiment. Figure 6 It is a schematic cross-sectional view of a magnetic gear motor 1C according to a fourth embodiment.

[0138] (1) Overall structure of magnetic gear motor

[0139] The magnetic gear motor 1C includes a stator 10C, a first rotating body 20C, and a second rotating body 30C.

[0140] The magnetic gear motor 1C further includes a housing 40C, a first bearing 51C, a second bearing 52C, a third bearing 531C, and a fourth bearing 532C. The housing 40C is a housing for accommodating the stator 10C, the first rotating body 20C, and the second rotating body 30C, and constitutes the outline of the magnetic gear motor 1C. The first bearing 51C, the second bearing 52C, the third bearing 531C, and the fourth bearing 532C are ball bearings.

[0141] (2) Stator

[0142] The stator 10C generates magnetic forces acting on the first rotating body 20C and the second rotating body 30C. Specifically, the stator 10C is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30C.

[0143] The stator 10C in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11C having a plurality of teeth and a yoke, a plurality of coils 12C wound around the plurality of teeth, and a plurality of permanent magnets.

[0144] (3) First rotating body

[0145] The first rotating body 20C includes a cylindrical first rotor 21C and a first rotating shaft 22C.

[0146] The first rotor 21C is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25C and a plurality of pole shoes 26C.

[0147] like Figure 6 As shown, in the magnetic gear motor 1C, the frame 25C of the first rotor 21C has: a first bottom 251C in the shape of a circular plate; a cylindrical portion 252C extending from the outer peripheral edge of the first bottom 251C to the first side in the axial direction; a second bottom 253C formed at the other end of the cylindrical portion 252C; and a tubular portion 254C extending from the inner peripheral edge of the second bottom 253C to the first side in the axial direction.

[0148] The plurality of pole shoes 26C are magnetic pole pieces formed of a magnetic material, respectively. The plurality of pole shoes 26C are inserted into the notches of the cylindrical portion 252C of the frame 25C and are molded and fixed with a molding resin.

[0149] The plurality of pole pieces 26C are arranged in a ring shape along the circumferential direction of the second rotating body 30C.

[0150] The plurality of pole shoes 26C radially oppose the permanent magnets 34C (described later) of the second rotating body 30C, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10C.

[0151] The first rotating shaft 22C functions as an output shaft and includes a main body 221C and a support shaft 222C. The support shaft 222C extends from the main body 221C toward the first side in the axial direction and enters the radially inner side of the second rotor 31C (described later).

[0152] (4) Second rotating body

[0153] The second rotating body 30C includes a cylindrical second rotor 31C disposed radially inside the first rotor 21C.

[0154] The second rotor 31 functions as a high-speed rotor, and includes a rotor core 33C and a plurality of permanent magnets 34C.

[0155] The rotor core 33C is a rotor core that serves as the core of the second rotor 31C. The rotor core 33C has a cylindrical shape and has an internal space 61C.

[0156] A plurality of permanent magnets 34C are provided on the rotor core 33C. The second rotor 31C is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34C are provided on the outer peripheral side of the rotor core 33C. Specifically, the plurality of permanent magnets 34C are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33C. The plurality of permanent magnets 34C are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotor 31C, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33C.

[0157] The stator 10C, the first rotor 21C of the first rotating body 20C, and the second rotor 31C of the second rotating body 30C are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10C and the first rotor 21C of the first rotating body 20C, and there is also an air gap between the first rotor 21C of the first rotating body 20C and the second rotor 31C of the second rotating body 30C.

[0158] (5) Cabinet

[0159] The housing 40C is composed of a plurality of parts. Specifically, the housing 40C includes a cylindrical portion 41C, a first bracket 42C, and a second bracket 43C.

[0160] The first holder 42C is arranged so as to close the opening on one side of the cylindrical portion 41C. A bearing holding portion 421C for holding the fourth bearing 532C is provided at the inner peripheral end of the first holder 42C.

[0161] The second holder 43C is arranged so as to close the opening of the other side of the cylindrical portion 41C. A first bearing holding portion 431C for holding the first bearing 51C is provided at the inner peripheral end of the second holder 43C.

[0162] (6) Bearings

[0163] The first rotating body 20C and the second rotating body 30C are coaxially configured to be rotatable independently of each other.

[0164] The first bearing 51C is disposed between the first bearing holding portion 431C of the second holder 43C and the main body portion 221C of the first rotating shaft 22C.

[0165] The third bearing 531C is disposed between the inner peripheral surface of the cylindrical portion 254C and the outer peripheral surface of the second rotating shaft 32C.

[0166] The fourth bearing 532C is disposed between the outer peripheral surface of the cylindrical portion 254C and the bearing holding portion 421C of the first bracket 42C of the housing 40C.

[0167] The second bearing 52C is disposed between the support shaft 222C of the first rotating shaft 22C and the second rotor 31C in the internal space 61C of the rotor core 33C.

[0168] like Figure 6 As shown in FIG. 1 , in the magnetic gear motor 1C, there is one second bearing 52C, which is arranged radially inward of the second rotor 31C. Specifically, the rotor core 33C of the second rotor 31C includes a first portion 331C supported by the second rotating shaft 32C and a second portion 332C extending from the first portion 331C to the second side in the axial direction. The second portion 332C has an inner diameter longer than that of the first portion 331C and has an inner space 61C, so that a gap 62C is ensured between the inner peripheral surface of the second portion 332C and the outer peripheral surface of the support shaft 222C. The second bearing 52C is arranged between the support shaft 222C of the first rotating shaft 22C and the second portion 332C of the rotor core 33C in the inner space 61C of the second portion 332C.

[0169] (7) Effect

[0170] As described above, one end of the first rotor 21C on the second side in the axial direction is supported by the first rotating shaft 22C. Specifically, one end of the first rotor 21C on the first side in the axial direction is supported by the second rotating shaft 32C by means of the third bearing 531C, and is also supported by the housing 40C by means of the fourth bearing 532C. Since the first rotor 21C is supported at both ends in this way, the rotation of the first rotor 21C is stable. Therefore, as in the first embodiment, the number of bearings between the first rotating shaft and the housing, which conventionally required two, can be reduced to one (specifically, in the present embodiment, the first bearing 51C is one), and as a result, the overall axial length of the magnetic gear motor 1C can be shortened.

[0171] In this embodiment as well, the second bearing 52C is arranged radially inward of the second rotor 31C. Therefore, the same effects as those of the first embodiment can be obtained with respect to the reduction in radial size of the magnetic gear motor 1C.

[0172] (Fifth embodiment)

[0173] In the fourth embodiment, the magnetic gear motor 1C includes the second rotating shaft 32C, but the second rotating shaft may be omitted.

[0174] use Figure 7 Such an example will be described as a fifth embodiment. Figure 7 It is a schematic cross-sectional view of a magnetic gear motor 1D according to the fifth embodiment.

[0175] (1) Overall structure of magnetic gear motor

[0176] The magnetic gear motor 1D includes a stator 10D, a first rotating body 20D, and a second rotating body 30D.

[0177] The magnetic gear motor 1D further includes a housing 40D, a first bearing 51D, a second bearing 52D, and a third bearing 53D. The housing 40D is a casing for accommodating the stator 10D, the first rotating body 20D, and the second rotating body 30D, and constitutes the outline of the magnetic gear motor 1D. The first bearing 51D, the second bearing 52D, and the third bearing 53D are ball bearings.

[0178] (2) Stator

[0179] The stator 10D generates magnetic force acting on the first rotating body 20D and the second rotating body 30D. Specifically, the stator 10D is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30D.

[0180] The stator 10D in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11D including a plurality of teeth and a yoke, a plurality of coils 12D wound around the plurality of teeth, and a plurality of permanent magnets.

[0181] (3) First rotating body

[0182] The first rotating body 20D includes a cylindrical first rotor 21D and a first rotating shaft 22D.

[0183] The first rotor 21D is a pole piece portion that functions as a low-speed rotor, and includes a frame 25D and a plurality of pole pieces 26D.

[0184] like Figure 7 As shown, in the magnetic gear motor 1D, the frame 25D of the first rotor 21D has: a first bottom 251D in the shape of a circular plate; a cylindrical portion 252D extending from the outer peripheral edge of the first bottom 251D toward the first side in the axial direction; a second bottom 253D formed at the other end of the cylindrical portion 252D; and a shaft 254D extending from the inner peripheral edge of the second bottom 253D toward both sides in the axial direction.

[0185] The plurality of pole shoes 26D are magnetic pole pieces formed of a magnetic material, respectively. The plurality of pole shoes 26D are inserted into the notches of the cylindrical portion 252D of the frame 25D and are molded and fixed with a molding resin.

[0186] The plurality of pole pieces 26D are arranged in a ring shape along the circumferential direction of the second rotating body 30D.

[0187] The plurality of pole shoes 26D radially oppose the permanent magnets 34D (described later) of the second rotating body 30D, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10D.

[0188] The first rotating shaft 22D functions as an output shaft and includes a main body 221D and a support shaft 222D. The support shaft 222D extends from the main body 221D toward the first side in the axial direction and enters the radially inner side of the second rotor 31D (described later).

[0189] (4) Second rotating body

[0190] The second rotating body 30D includes a cylindrical second rotor 31D disposed radially inside the first rotor 21D.

[0191] like Figure 7 As shown, in the magnetic gear motor 1D, the second rotating shaft 32C (see Figure 6 ), the second rotor 31D is composed of a rotor core 33D and a plurality of permanent magnets 34D.

[0192] The stator 10D, the first rotor 21D of the first rotating body 20D, and the second rotor 31D of the second rotating body 30D are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10D and the first rotor 21D of the first rotating body 20D, and there is also an air gap between the first rotor 21D of the first rotating body 20D and the second rotor 31D of the second rotating body 30D.

[0193] The rotor core 33D is a rotor core that becomes the core of the second rotor 31D. The rotor core 33D includes a circular plate portion 331D and a cylindrical portion 332D extending in the axial direction from the outer peripheral edge of the circular plate portion 331D. The cylindrical portion 332D includes a first portion 333D extending to the second side in the axial direction and a second portion 334D extending to the first side in the axial direction. The first portion 333D includes an internal space 61D, and the inner peripheral surface of the first portion 333D is separated from the outer peripheral surface of the support shaft 222D. The second portion 334D includes an internal space 61D, and the inner peripheral surface of the second portion 334D is separated from the outer peripheral surface of the shaft body 254D (to be discussed later).

[0194] A plurality of permanent magnets 34D are provided on the rotor core 33D. The second rotor 31D is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34D are provided on the outer peripheral side of the rotor core 33D. Specifically, the plurality of permanent magnets 34D are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33D. The plurality of permanent magnets 34D are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotor 31D, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33D.

[0195] The support shaft 222D of the first rotating shaft 22D is different from the support shaft 222 of the first embodiment (see Figure 3 ) further extends longer toward the first side in the axial direction and is embedded in the radial inner side of the third bearing 53D. That is, the top end of the support shaft 222D is rotatably supported by the housing 40D via the third bearing 53D.

[0196] In the magnetic gear motor 1D, the frame 25D of the first rotor 21D includes: a disc-shaped first bottom 251D; a cylindrical portion 252D extending from the outer peripheral edge of the first bottom 251D to the first side in the axial direction; a second bottom 253D formed at the other end of the cylindrical portion 252D; and a shaft 254D extending from the inner peripheral edge of the second bottom 253D to both sides in the axial direction. The shaft 254D is coaxial with the support shaft 222D.

[0197] (5) Cabinet

[0198] The housing 40D is composed of a plurality of parts. Specifically, the housing 40D includes a cylindrical portion 41D, a first bracket 42D, and a second bracket 43D.

[0199] The first holder 42D is arranged so as to close the opening on one side of the cylindrical portion 41D. The first holder 42D is provided with a third bearing holding portion 421D for holding the third bearing 53D.

[0200] The second holder 43D is arranged so as to close the opening on the other side of the cylindrical portion 41D. The second holder 43D is provided with a first bearing holding portion 431D for holding the first bearing 51 .

[0201] (6) Bearings

[0202] The first rotating body 20D and the second rotating body 30D are coaxially configured to be rotatable independently of each other.

[0203] The first bearing 51D is disposed between the first bearing holding portion 431D of the second holder 43D and the main body portion 221D of the first rotating shaft 22D.

[0204] The third bearing 53D is disposed between a portion of the shaft body 254D on the first side in the axial direction and a third bearing holding portion 421D of the first bracket 42D of the housing 40D.

[0205] The second bearing 52D is arranged radially inward of the rotor core 33D. Specifically, the second bearing 52D is a double bearing type, and has a first small bearing 54D and a second small bearing 55D. The first small bearing 54D is arranged between the support shaft 222D of the first rotating shaft 22D and the first portion 333D of the rotor core 33D. The second small bearing 55D is arranged between the second side portion of the shaft body 254D in the axial direction and the second portion 334D of the rotor core 33D.

[0206] (7) Effect

[0207] In this embodiment as well, the second bearing 52D is arranged radially inward of the second rotor 31D, and therefore, the same effects as those of the fourth embodiment can be obtained.

[0208] (Sixth Implementation Method)

[0209] Figure 8 It is a schematic cross-sectional view of a magnetic gear motor 1E according to the sixth embodiment. Figure 8 The basic structure of the magnetic gear motor 1E shown is the same as the basic structure of the magnetic gear motor 1C of the fourth embodiment in that the first rotating body is supported at both ends.

[0210] (1) Overall structure of magnetic gear motor

[0211] The magnetic gear motor 1E includes a stator 10E, a first rotating body 20E, and a second rotating body 30E.

[0212] The magnetic gear motor 1E further includes a housing 40E, a first bearing 51E, a second bearing 52E, a third bearing 531E, and a fourth bearing 532E. The housing 40E is a casing for accommodating the stator 10E, the first rotating body 20E, and the second rotating body 30E, and constitutes the outline of the magnetic gear motor 1. The first bearing 51E, the second bearing 52E, the third bearing 531E, and the fourth bearing 532E are ball bearings.

[0213] (2) Stator

[0214] The stator 10E generates magnetic forces acting on the first rotating body 20E and the second rotating body 30E. Specifically, the stator 10E is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30E.

[0215] The stator 10E in this embodiment includes: a stator core 11E having a plurality of teeth and a yoke; a plurality of coils 12E wound around the plurality of teeth; and a plurality of permanent magnets, similarly to the stator 10 shown in the first embodiment.

[0216] (3) First rotating body

[0217] The first rotating body 20E includes a cylindrical first rotor 21E and a first rotating shaft 22E.

[0218] The first rotor 21E is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25E and a plurality of pole shoes 26E.

[0219] like Figure 8 As shown, in the magnetic gear motor 1E, the frame 25E of the first rotor 21E has: a first bottom 251E in the shape of a circular plate; a cylindrical portion 252E extending from the outer peripheral edge of the first bottom 251E to the first side in the axial direction; a second bottom 253E formed at the other end of the cylindrical portion 252E; and a tubular portion 254E extending from the inner peripheral edge of the second bottom 253E to the first side in the axial direction.

[0220] The plurality of pole shoes 26E are magnetic pole pieces formed of a magnetic material, respectively. The plurality of pole shoes 26E are inserted into the notches of the cylindrical portion 252E of the frame 25E and are molded and fixed with a molding resin.

[0221] The plurality of pole pieces 26E are arranged in a ring shape along the circumferential direction of the second rotating body 30E.

[0222] The plurality of pole shoes 26E radially oppose the permanent magnets 34E (described later) of the second rotating body 30E, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10E.

[0223] The first rotating shaft 22E functions as an output shaft and includes a main body 221E and a support shaft 222E. The support shaft 222E extends from the main body 221E toward the first side in the axial direction and enters the radially inner side of the second rotor 31E (described later).

[0224] (4) Second rotating body

[0225] The second rotating body 30E includes a cylindrical second rotor 31E disposed radially inside the first rotor 21E.

[0226] The second rotor 31E functions as a high-speed rotor, and includes a rotor core 33E and a plurality of permanent magnets 34E.

[0227] The rotor core 33E is a rotor core that serves as the core of the second rotor 31E. The rotor core 33E has a cylindrical shape and has an internal space 61E.

[0228] A plurality of permanent magnets 34E are provided on the rotor core 33E. The second rotor 31E is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34E are provided on the outer peripheral side of the rotor core 33E. Specifically, the plurality of permanent magnets 34E are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33E. The plurality of permanent magnets 34E are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotor 31E, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33E.

[0229] The stator 10E, the first rotor 21E of the first rotating body 20E, and the second rotor 31E of the second rotating body 30E are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10E and the first rotor 21E of the first rotating body 20E, and there is also an air gap between the first rotor 21E of the first rotating body 20E and the second rotor 31E of the second rotating body 30E.

[0230] (5) Cabinet

[0231] The housing 40E is composed of a plurality of parts. Specifically, the housing 40E includes a cylindrical portion 41E, a first bracket 42E, and a second bracket 43E.

[0232] The first holder 42E is arranged so as to close the opening on one side of the cylindrical portion 41E. The first holder 42E is provided with a bearing holding portion 421E for holding the fourth bearing 532E.

[0233] The second holder 43E is arranged so as to close the opening on the other side of the tube portion 41E. The second holder 43E is provided with a first bearing holding portion 431E for holding the first bearing 51 .

[0234] (6) Bearings

[0235] The first rotating body 20E and the second rotating body 30E are coaxially configured to be rotatable independently of each other.

[0236] The first bearing 51E is disposed between the first bearing holding portion 431E of the second holder 43E and the main body portion 221E of the first rotating shaft 22E.

[0237] The third bearing 531E is arranged between the inner peripheral surface of the cylindrical portion 254E and the outer peripheral surface of the second rotating shaft 32E.

[0238] The second bearing 52E is disposed between the support shaft 222E of the first rotating shaft 22E and the second rotor 31E in the internal space 61E of the rotor core 33E.

[0239] like Figure 8As shown in FIG. 1 , in the magnetic gear motor 1E, there is one second bearing 52E, which is arranged radially inward of the second rotor 31E. Specifically, the rotor core 33E of the second rotor 31E includes a first portion 331E supported by the second rotating shaft 32E and a second portion 332E extending from the first portion 331E to the second side in the axial direction. The second portion 332E has an inner diameter longer than that of the first portion 331E and has an inner space 61E, so that a gap 62E is ensured between the inner peripheral surface of the second portion 332E and the outer peripheral surface of the support shaft 222B. The second bearing 52B is arranged between the support shaft 222E of the first rotating shaft 22E and the second portion 332E of the rotor core 33E in the inner space 61E of the second portion 332B.

[0240] The fourth bearing 532E is disposed between the outer peripheral surface of the second rotating shaft 32E and the bearing holding portion 421E of the first bracket 42E of the housing 40E.

[0241] (7) Effect

[0242] In this embodiment as well, the second bearing 52E is arranged radially inward of the second rotor 31E, and therefore, the same effects as those of the fourth embodiment can be obtained.

[0243] (Seventh Implementation Method)

[0244] In the first to sixth embodiments, the support shaft is a part of the first rotor, but the support shaft may be a part of the casing.

[0245] use Fig. 9 Such an embodiment will be described as the seventh embodiment. Fig. 9 It is a schematic cross-sectional view of a magnetic gear motor 1F according to the seventh embodiment.

[0246] (1) Overall structure of magnetic gear motor

[0247] The magnetic gear motor 1F includes a stator 10F, a first rotating body 20F, and a second rotating body 30F.

[0248] The magnetic gear motor 1F further includes a housing 40F, a first bearing 51F, a second bearing 52F, and a third bearing 53F. The housing 40F is a casing for accommodating the stator 10F, the first rotating body 20F, and the second rotating body 30F, and constitutes the outline of the magnetic gear motor 1F. The first bearing 51F, the second bearing 52F, and the third bearing 53F are ball bearings.

[0249] (2) Stator

[0250] The stator 10F generates magnetic forces acting on the first rotating body 20F and the second rotating body 30F. Specifically, the stator 10F is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30F.

[0251] The stator 10F in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11F including a plurality of teeth and a yoke, a plurality of coils 12F wound around the plurality of teeth, and a plurality of permanent magnets.

[0252] (3) First rotating body

[0253] The first rotating body 20F includes a cylindrical first rotor 21F and a first rotating shaft 22F.

[0254] The first rotor 21F is a pole shoe portion that functions as a low-speed rotor and includes a frame 25F and a plurality of pole shoes 26F. The frame 25F of the first rotor 21F includes: a disc-shaped first bottom portion 251F; a cylindrical portion 252F that extends from the outer peripheral edge of the first bottom portion 251F toward the first side in the axial direction; and a second bottom portion 253F that is formed at the other end of the cylindrical portion 252F.

[0255] The plurality of pole shoes 26F are magnetic pole pieces formed of a magnetic material, respectively. The plurality of pole shoes 26F are inserted into the notches of the cylindrical portion 252F of the frame 25F and are molded and fixed with a molding resin.

[0256] The plurality of pole pieces 26F are arranged in a ring shape along the circumferential direction of the second rotating body 30F.

[0257] The plurality of pole shoes 26F radially oppose the permanent magnets 34F (described later) of the second rotating body 30F, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10F.

[0258] The first rotating shaft 22F functions as an output shaft and has a main body portion 221F.

[0259] The first rotor 21F is fixed to the first rotating shaft 22F. Specifically, the inner peripheral end of the first bottom 251F of the frame 25F is fixed to the main body 221F of the first rotating shaft 22F by screws. In the above-described structure, the first rotor 21F is cantilevered on the first rotating shaft 22F. Therefore, for example, the first rotating body 20F and the second rotating body 30F can be easily assembled.

[0260] (4) Second rotating body

[0261] The second rotating body 30F includes a cylindrical second rotor 31F disposed radially inside the first rotor 21F.

[0262] The second rotor 31F functions as a high-speed rotor, and includes a rotor core 33F and a plurality of permanent magnets 34F.

[0263] The rotor core 33F is a rotor core that serves as the core of the second rotor 31F. The rotor core 33F has a cylindrical shape and has an internal space 61F.

[0264] A plurality of permanent magnets 34F are provided on the rotor core 33F. The second rotor 31F is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34F are provided on the outer peripheral side of the rotor core 33F. Specifically, the plurality of permanent magnets 34F are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33F. The plurality of permanent magnets 34F are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotor 31F, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33F.

[0265] The stator 10F, the first rotor 21F of the first rotating body 20F, and the second rotor 31F of the second rotating body 30F are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10F and the first rotor 21F of the first rotating body 20F, and there is also an air gap between the first rotor 21F of the first rotating body 20F and the second rotor 31F of the second rotating body 30F.

[0266] (5) Cabinet

[0267] The housing 40F is composed of a plurality of parts. Specifically, the housing 40F includes a cylindrical portion 41F, a first bracket 42F, and a second bracket 43F.

[0268] The first holder 42F is arranged so as to close the opening on one side of the tube portion 41F. The first holder 42F is provided with a third bearing holding portion 421F for holding the third bearing 53F.

[0269] The second holder 43F is arranged so as to close the other opening of the tube portion 41F.

[0270] The housing 40F further includes a support shaft 44F. The support shaft 44F extends from the radial center of the first bracket 42F of the housing 40F toward the second side in the axial direction and enters the radial inner side of the second rotor 31F.

[0271] (6) Bearings

[0272] The first rotating body 20F and the second rotating body 30F are coaxially configured to be rotatable independently of each other.

[0273] The first bearing 51F is disposed between the first bearing holding portion 431F of the second holder 43F and the main body portion 221F of the first rotating shaft 22F.

[0274] The second bearing 52F is arranged between the support shaft 44F of the housing 40F and the second rotor 31F in the internal space 61F of the rotor core 33. The second bearing 52F is a double bearing type, and has a first small bearing 54F and a second small bearing 55F. The first small bearing 54F and the second small bearing 55F are of the same size, and each has a smaller diameter than the diameter of the first bearing 51F. The first small bearing 54F and the second small bearing 55F are arranged to be separated from each other along the axial direction of the support shaft 44F of the housing 40F.

[0275] The third bearing 53F is disposed between the inner peripheral surface of the second bottom portion 253F and the outer peripheral surface of the support shaft 44F of the housing 40F.

[0276] (7) Effect

[0277] In this embodiment as well, the second bearing 52F is arranged radially inward of the second rotor 31F, and therefore, the same effects as those of the first embodiment can be obtained.

[0278] Furthermore, since the housing 40F includes the support shaft 44F, the structure of the first rotating shaft 22F can be simplified.

[0279] (Eighth Implementation Method)

[0280] Fig.10 It is a schematic cross-sectional view of a magnetic gear motor 1G according to the eighth embodiment. Fig.10 The basic structure of the magnetic gear motor 1G shown is the same as the basic structure of the magnetic gear motor 1F of the seventh embodiment in that the second rotating body is supported by the supporting shaft of the casing.

[0281] (1) Overall structure of magnetic gear motor

[0282] The magnetic gear motor 1G includes a stator 10G, a first rotating body 20G, and a second rotating body 30G.

[0283] The magnetic gear motor 1G further includes a housing 40G, a first bearing 51G, a second bearing 52G, and a third bearing 53G. The housing 40G is a casing for accommodating the stator 10G, the first rotating body 20G, and the second rotating body 30G, and constitutes the outline of the magnetic gear motor 1G. The first bearing 51G, the second bearing 52G, and the third bearing 53G are ball bearings.

[0284] (2) Stator

[0285] The stator 10G generates magnetic force acting on the first rotating body 20G and the second rotating body 30G. Specifically, the stator 10G is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30G.

[0286] The stator 10G in this embodiment includes, similarly to the stator 10 shown in the first embodiment, a stator core 11G including a plurality of teeth and a yoke, a plurality of coils 12G wound around the plurality of teeth, and a plurality of permanent magnets.

[0287] (3) First rotating body

[0288] The first rotating body 20G includes a cylindrical first rotor 21G and a first rotating shaft 22G.

[0289] The first rotor 21G is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25G and a plurality of pole shoes 26G.

[0290] The frame 25G of the first rotating body 20G has a bottom portion 251G and a cylindrical portion 252G. The pole shoe 26G is attached to the cylindrical portion 252G. That is, in this embodiment, the first rotor 21G is cantilever-supported by the first rotating shaft 22G.

[0291] The plurality of pole shoes 26G are magnetic pole pieces formed of a magnetic material, respectively. The plurality of pole shoes 26G are inserted into the notches of the cylindrical portion 252G of the frame 25G and are fixed by molding with a molding resin.

[0292] The plurality of pole pieces 26G are arranged in a ring shape along the circumferential direction of the second rotating body 30G.

[0293] The plurality of pole shoes 26G radially oppose the permanent magnets 34G (described later) of the second rotating body 30G, and also radially oppose the plurality of teeth and the plurality of permanent magnets of the stator 10G.

[0294] The first rotating shaft 22G functions as an output shaft and includes a main body 221G and a support shaft 222G. The support shaft 222G extends from the main body 221G toward the first side in the axial direction and enters the radially inner side of the second rotor 31G (described later).

[0295] (4) Second rotating body

[0296] The second rotating body 30G includes a cylindrical second rotor 31G disposed radially inside the first rotor 21G.

[0297] The second rotor 31G functions as a high-speed rotor, and includes a rotor core 33G and a plurality of permanent magnets 34G.

[0298] The rotor core 33G is a rotor core that serves as the core of the second rotor 31G. The rotor core 33G has a cylindrical shape and has an internal space 61G.

[0299] A plurality of permanent magnets 34G are provided on the rotor core 33G. The second rotor 31G is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34G are provided on the outer peripheral side of the rotor core 33G. Specifically, the plurality of permanent magnets 34G are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33G. The plurality of permanent magnets 34G are magnetized in a manner that the magnetic pole direction becomes the radial direction of the second rotor 31G, and are arranged in a manner that the N pole and the S pole exist alternately and evenly along the circumferential direction of the rotor core 33G.

[0300] The stator 10G, the first rotor 21G of the first rotating body 20G, and the second rotor 31G of the second rotating body 30G are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10G and the first rotor 21G of the first rotating body 20G, and there is also an air gap between the first rotor 21G of the first rotating body 20G and the second rotor 31G of the second rotating body 30G.

[0301] (5) Cabinet

[0302] The housing 40G is composed of a plurality of parts. Specifically, the housing 40G includes a cylindrical portion 41G, a first bracket 42G, and a second bracket 43G.

[0303] The first holder 42G is arranged so as to close the opening on one side of the tube portion 41G.

[0304] The second holder 43G is disposed so as to close the other opening of the cylindrical portion 41G. The second holder 43G is provided with a first bearing holding portion 431G for holding the first bearing 51 .

[0305] The casing 40G further includes a support shaft 44G. The support shaft 44G extends from the radial center of the first bracket 42F of the casing 40G toward the second side in the axial direction and enters the radial inner side of the second rotor 31G.

[0306] (6) Bearings

[0307] The first rotating body 20G and the second rotating body 30G are coaxially configured to be rotatable independently of each other.

[0308] The first bearing 51G is disposed between the first bearing holding portion 431G of the second holder 43G and the main body portion 221G of the first rotating shaft 22G.

[0309] The second bearing 52G is arranged between the support shaft 44G of the housing 40G and the second rotor 31G in the internal space 61G of the rotor core 33G. The second bearing 52G is a double bearing type, and has a first small bearing 54G and a second small bearing 55G. The first small bearing 54G and the second small bearing 55G are of the same size, and each has a smaller diameter than the diameter of the first bearing 51G. The first small bearing 54G and the second small bearing 55G are arranged separately from each other along the axial direction of the support shaft 44G of the housing 40G.

[0310] The third bearing 53G is disposed between the inner peripheral surface of the second end portion in the axial direction of the rotor core 33G and the outer peripheral surface of the front end of the support shaft 222G of the first rotating shaft 22G.

[0311] (7) Effect

[0312] In this embodiment as well, the second bearing 52G is arranged radially inward of the second rotor 31G, and therefore, the same effects as those of the seventh embodiment can be obtained. In addition, the third bearing 53G is also arranged radially inward of the second rotor 31G.

[0313] (Ninth Implementation Method)

[0314] In the first to eighth embodiments, an inner rotor type motor is described as the magnetic gear motor, but the present disclosure is also applicable to an outer rotor type magnetic gear motor.

[0315] (1) Overall structure of magnetic gear motor

[0316] use Fig.11 Next, a magnetic gear motor 1H according to a ninth embodiment will be described. Fig. 9 It is a schematic cross-sectional view of a magnetic gear motor 1H according to a ninth embodiment.

[0317] The magnetic gear motor 1H mainly includes a stator 10H, a first rotating body 20H, and a second rotating body 30H.

[0318] The magnetic gear motor 1H further includes a housing 40H, a first bearing 51H, a second bearing 52H, and a third bearing 53H. The housing 40H is a casing for holding the stator 10H. The first bearing 51H, the second bearing 52H, and the third bearing 53H are ball bearings.

[0319] The magnetic gear motor 1H is an outer rotor type motor in which the first rotating body 20H is arranged radially outside the stator 10H.

[0320] The stator 10H, the first rotating body 20H, and the second rotating body 30H are coaxially arranged. That is, the center of the stator 10H, the axis of the first rotating shaft 22H of the first rotating body 20H, and the axis of the second rotating shaft 32H of the second rotating body 30H are consistent. Fig.11 Therefore, the rotation center of the first rotating body 20H coincides with the rotation center of the second rotating body 30H.

[0321] (2) Stator

[0322] The stator 10H generates magnetic forces acting on the first rotating body 20H and the second rotating body 30H. Specifically, the stator 10H is configured so that N poles and S poles appear alternately in the circumferential direction on the air gap surface facing the second rotating body 30H.

[0323] The stator 10H has, similarly to the stator 10 shown in the first embodiment, a stator core 11H having a plurality of teeth and a yoke, a plurality of coils 12H wound around the plurality of teeth, and a plurality of permanent magnets. The stator core 11H is a stator core that serves as the core of the stator 10H and generates a magnetic force for rotating the first rotating body 20H and the second rotating body 30H. The stator core 11H is, for example, a stacked body in which a plurality of electromagnetic steel sheets are stacked in the direction of the axis of the first rotating shaft 22H of the first rotating body 20H.

[0324] The coil 12H is a winding coil as an armature winding of the stator 10H, and the conductive wire is wound in such a manner that a magnetic flux acting on the first rotating body 20H is generated by the flow of current. The plurality of coils 12H correspond to the plurality of teeth in a one-to-one manner, and each coil 12H is, for example, a concentrated winding coil wound around the corresponding tooth. In addition, the coil 12H is a three-phase winding in such a manner that the first rotating body 20H can be rotated by setting it as a three-phase synchronous motor.

[0325] Each permanent magnet is arranged radially inward of each coil 12H on the inner peripheral surface of the stator 10H. The permanent magnet is arranged across two adjacent teeth. The permanent magnet is magnetized so that the magnetic pole direction is in the radial direction of the stator 10H. The permanent magnet is, for example, a sintered magnet.

[0326] The stator 10H is held by a housing 40H. Specifically, the housing 40H has a disc-shaped bottom 42H and a support shaft 44H extending from the center of the disc-shaped bottom 42H to the second side in the axial direction. The stator 10H extends from the outer peripheral edge of the bottom 42H to the second side in the axial direction. The support shaft 44H enters the radial inner side of the second rotor 31H (discussed later).

[0327] (3) First rotating body

[0328] The first rotating body 20H includes a cylindrical first rotor 21H and a first rotating shaft 22H. The magnetic flux generated from the stator 10H acts on the first rotor 21H, so that the first rotating body 20H rotates around the axis A1 of the first rotating shaft 22H.

[0329] The first rotor 21H is arranged radially outside the stator 10H.

[0330] The first rotor 21H is a pole shoe portion, and includes a frame 25H and a plurality of pole shoes 26H. The frame 25H includes a disc-shaped bottom 251H and a cylindrical portion 252H extending from the outer peripheral edge of the bottom 251H toward the first side in the axial direction. The plurality of pole shoes 26H are magnetic pole pieces formed of a magnetic material. The plurality of pole shoes 26H are inserted into the notches of the cylindrical portion 252H of the frame 25H and are fixed by molding with a molding resin.

[0331] The plurality of pole shoes 26H are arranged in a ring shape along the circumferential direction of the second rotating body 30H. The plurality of pole shoes 26H are respectively long magnetic members formed of a magnetic material. The plurality of pole shoes 26H are respectively laminated bodies formed by laminating a plurality of steel plates.

[0332] The plurality of pole shoes 26H are opposed to the permanent magnets 34H (described later) of the second rotating body 30H in the radial direction, and are also opposed to the plurality of teeth and the plurality of permanent magnets of the stator 10H in the radial direction.

[0333] The first rotating shaft 22H includes a main body portion 221H and a support shaft 222H. The support shaft 222H extends from the main body portion 221H toward the first side in the axial direction and enters the radially inner side of the second rotor 31H.

[0334] The first rotor 21H is fixed to the first rotating shaft 22H. Specifically, the inner peripheral end of the bottom 251H of the frame 25H is fixed to the main body 221H of the first rotating shaft 22H with screws.

[0335] (4) Second rotating body

[0336] The second rotating body 30H includes a cylindrical second rotor 31H. The second rotor 31H is arranged radially inside the stator 10H.

[0337] The second rotor 31H has a rotor core 33H and a plurality of permanent magnets 34H. The rotor core 33H is a rotor iron core that becomes the core of the second rotating body 30, and is, for example, a laminated body formed by laminating a plurality of electromagnetic steel sheets in the axial direction of the second rotating shaft 32H. In addition, the rotor core 33H is not limited to a laminated body of electromagnetic steel sheets, but may also be a block formed of a magnetic material. The rotor core 33H is cylindrical and has an internal space 61H.

[0338] A plurality of permanent magnets 34H are provided on the rotor core 33H. The second rotating body 30H is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34H are provided on the outer peripheral side of the rotor core 33H. Specifically, a plurality of permanent magnets 34H are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33H. The plurality of permanent magnets 34H are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotating body 30H, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the second rotating shaft 32H.

[0339] The first rotor 21H of the first rotating body 20H, the stator 10H, and the second rotor 31H of the second rotating body 30H are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the first rotor 21H of the first rotating body 20H and the stator 10H, and there is also an air gap between the stator 10H and the second rotor 31H of the second rotating body 30H.

[0340] (5) Bearings

[0341] The first rotating body 20H and the second rotating body 30H are coaxially configured to be rotatable independently of each other.

[0342] The first bearing 51H is disposed between the support shaft 222H and the rotor core 33H of the second rotor 31H.

[0343] The third bearing 53H is disposed between the inner peripheral surface of the front end in the axial direction of the frame 25H and the outer peripheral surface of the bottom portion 42H of the housing 40H.

[0344] The second bearing 52H is arranged between the support shaft 44H and the second rotor 31H in the internal space 61H of the rotor core 33H. The second bearing 52H is a double bearing type, and has a first small bearing 54H and a second small bearing 55H. The first small bearing 54H and the second small bearing 55H are of the same size, and each has a smaller diameter than the third bearing 53H. The first small bearing 54H and the second small bearing 55H are arranged to be separated from each other along the axial direction of the support shaft 44H.

[0345] (6) Effect

[0346] As described above, the second bearing 52H is arranged radially inside the second rotor 31H. Therefore, a small-diameter bearing can be used as the second bearing 52H, and cost reduction can be achieved. In addition, by making good use of the internal space 61H of the second rotor 31H, the magnetic gear motor 1H can be miniaturized.

[0347] (10th embodiment)

[0348] In the first to ninth embodiments, the present disclosure is applied to a magnetic gear motor in which a magnetic gear and a motor are integrated, but the present disclosure can be applied to a separate magnetic gear that is independent of the motor.

[0349] use Fig.12 Such an embodiment will be described as the tenth embodiment. Fig.12 It is a schematic cross-sectional view of a magnetic gear 3I according to the tenth embodiment.

[0350] (1) Overall structure of magnetic gear

[0351] The magnetic gear 3I includes a stator 10I, a first rotating body 20I, and a second rotating body 30I.

[0352] The magnetic gear 3I further includes a housing 40I, a first bearing 51I, a second bearing 52I, and a third bearing 53I. The housing 40I is a shell for accommodating the stator 10I, the first rotating body 20I, and the second rotating body 30I, and constitutes the outline of the magnetic gear 3I. The first bearing 51I, the second bearing 52I, and the third bearing 53I are ball bearings.

[0353] The stator 10I is arranged so as to surround the first rotating body 20I and the second rotating body 30I. The stator 10I, the first rotating body 20I, and the second rotating body 30I are arranged coaxially. That is, the center of the stator 10I, the axis of the first rotating shaft 22I of the first rotating body 20I, and the axis of the second rotating shaft 32I of the second rotating body 30I coincide with each other. Therefore, the rotation center of the first rotating body 20I coincides with the rotation center of the second rotating body 30I.

[0354] (2) Stator

[0355] The stator 10I is configured such that N poles and S poles appear alternately in the circumferential direction on an air gap surface facing the second rotating body 30I.

[0356] The stator 10I has a stator core 11I and a plurality of permanent magnets in the same manner as the stator 10 shown in the first embodiment. The stator core 11I is a stator iron core that serves as the core of the stator 10I. The stator core 11I is, for example, a stacked body formed by stacking a plurality of electromagnetic steel sheets in the axial direction extending from the axis A1 of the first rotating shaft 22I of the first rotating body 20I. In addition, the stator core 11 is not limited to a stacked body of a plurality of steel sheets, but may also be a block formed of a magnetic material.

[0357] Each permanent magnet is arranged on the inner peripheral surface of the stator 10I. The permanent magnet is magnetized so that the magnetic pole direction becomes the radial direction of the stator 10I. The permanent magnet is, for example, a sintered magnet.

[0358] (3) First rotating body

[0359] The first rotating body 20I includes a cylindrical first rotor 21I and a first rotating shaft 22I.

[0360] The first rotor 21I is a pole shoe portion that functions as a low-speed rotor, and includes a frame 25I and a plurality of pole shoes 26I. The frame 25I includes a disc-shaped bottom 251I and a cylindrical portion extending from the outer peripheral edge of the bottom 251I toward the first side in the axial direction. The plurality of pole shoes 26I are magnetic pole pieces formed of a magnetic material. The plurality of pole shoes 26I are inserted into the notch of the cylindrical portion of the frame 25I and are molded and fixed using a molding resin.

[0361] The plurality of pole pieces 26I are arranged in a ring shape along the circumferential direction of the second rotating body 30I.

[0362] The plurality of pole pieces 26I face the permanent magnets 34I (described later) of the second rotating body 30I in the radial direction.

[0363] The first rotating shaft 22I functions as an output shaft, and includes a main body 221I and a support shaft 222I. The support shaft 222I extends from the main body 221I toward the first side in the axial direction and enters the radially inner side of a second rotor 31I (described later).

[0364] The first rotor 21I is fixed to the first rotating shaft 22I. Specifically, the inner peripheral end of the bottom 251I of the frame 25I is fixed to the main body 221I of the first rotating shaft 22I by screws. In the above-described structure, the first rotor 21I is cantilevered on the first rotating shaft 22I. Therefore, for example, the first rotating body 20I and the second rotating body 30I can be easily assembled.

[0365] (4) Second rotating body

[0366] The second rotating body 30I includes a cylindrical second rotor 31I arranged radially inside the first rotor 21I.

[0367] The second rotor 31 functions as a high-speed rotor, and includes a rotor core 33I and a plurality of permanent magnets 34I.

[0368] The rotor core 33I is a rotor core that serves as the core of the second rotor 31I. The rotor core 33I has a cylindrical shape and has an internal space 61I.

[0369] A plurality of permanent magnets 34I are provided on the rotor core 33I. The second rotor 31I is a surface magnet (SPM) rotor, and therefore, a plurality of permanent magnets 34I are provided on the outer peripheral side of the rotor core 33I. Specifically, the plurality of permanent magnets 34I are continuously arranged in the circumferential direction in a manner covering the entire outer peripheral side of the rotor core 33I. The plurality of permanent magnets 34I are magnetized in a manner such that the magnetic pole direction becomes the radial direction of the second rotor 31I, and are arranged in a manner such that the N pole and the S pole are alternately and evenly present along the circumferential direction of the rotor core 33I.

[0370] The stator 10I, the first rotor 21I of the first rotating body 20I, and the second rotor 31I of the second rotating body 30I are arranged in this order from the radially outer side to the radially inner side. Therefore, there is an air gap between the stator 10I and the first rotor 21I of the first rotating body 20I, and there is also an air gap between the first rotor 21I of the first rotating body 20I and the second rotor 31I of the second rotating body 30I.

[0371] (5) Cabinet

[0372] The housing 40I is composed of a plurality of parts. Specifically, the housing 40I includes a cylindrical portion 41I, a first bracket 42I, and a second bracket 43I.

[0373] The first holder 42I is arranged so as to close the opening on one side of the cylindrical portion 41I. The first holder 42I is provided with a third bearing holding portion 421I for holding the third bearing 53I.

[0374] The second holder 43I is arranged so as to close the opening on the other side of the cylindrical portion 41I. The second holder 43I is provided with a first bearing holding portion 431I for holding the first bearing 51I.

[0375] (6) Bearings

[0376] The first rotating body 20I and the second rotating body 30I are coaxially configured to be rotatable independently of each other.

[0377] The second bearing 52I is arranged between the support shaft 222I of the first rotating shaft 22I and the second rotor 31I in the internal space 61I of the rotor core 33I. The second bearing 52I is a double bearing type, and has a first small bearing 54I and a second small bearing 55I. The first small bearing 54I and the second small bearing 55I are of the same size, and each has a smaller diameter than the first bearing 51I and the third bearing 53I. The first small bearing 54I and the second small bearing 55I are arranged separately from each other along the axial direction of the support shaft 222I of the first rotating shaft 22I.

[0378] (7) Action

[0379] When the second rotating body 30I rotates, magnetic flux generated from the second rotating body 30I and magnetic flux generated from the stator 10I act on the pole piece 26I of the first rotating body 20I, and as a result, the first rotating body 20I is decelerated at a predetermined gear ratio (reduction ratio) and rotates with high torque.

[0380] (8) Effect

[0381] In this embodiment, the second bearing 52I is also arranged radially inward of the second rotor 31I. Therefore, a bearing with a small diameter can be used as the second bearing 52, and cost reduction can be achieved.

[0382] (9) Modification of magnetic gear

[0383] In addition, the third embodiment ( Figure 5 )、The fourth embodiment ( Figure 6 )、Sixth Implementation Method ( Figure 8 )'s magnetic gear motor structure can also be applied to magnetic gears.

[0384] (Variation Example)

[0385] The above-mentioned embodiments are only a few of the various embodiments of the present disclosure. As long as the purpose of the present disclosure can be achieved, the above-mentioned embodiments can be variously modified according to the design, etc. The following lists the modified examples of the above-mentioned embodiments. The modified examples described below can be appropriately combined and applied.

[0386] In the above embodiment, the first rotor is an SPM rotor, but it is not limited to this. For example, the first rotor may be a permanent magnet type rotor, or an interior permanent magnet (IPM) type rotor in which a permanent magnet is embedded in the rotor core. In this case, it may be a rotor in which a permanent magnet composed of a sintered magnet is inserted into a through hole (embedded hole) provided in the rotor core, or it may be a rotor in which a bonded magnet is embedded in an embedded hole provided in the rotor core.

[0387] (form)

[0388] The following aspects are disclosed in this specification.

[0389] A first embodiment of a magnetic gear motor (1, 1A to 1H) includes a stator (10, 10A to 10H), a first rotating body (20, 20A to 20H), a second rotating body (30, 30A to 30H), a support shaft (222, 222A to 222E, 222G, 44F, 44H) and a bearing (52, 52A to 52H). The first rotating body (20, 20A to 20H) includes a cylindrical first rotor (21, 21A to 21H) and a rotating shaft (22 to 22H) with an axis (A1) as a rotation center. The second rotating body (30, 30A to 30H) includes a second rotor (31, 31A to 31H) disposed between the first rotor (21, 21A to 21H) and the axis of the rotating shaft (22 to 22H). The support shaft (222, 222A to 222E, 222G, 44F, 44H) is arranged toward the axis of the rotating shaft (22 to 22H) when viewed from the second rotor (31, 31A to 31H). The bearing (52, 52A to 52H) is arranged between the support shaft (222, 222A to 222E, 222G, 44F, 44H) and the second rotor (31, 31A to 31H).

[0390] According to this aspect, the bearings (52, 52A to 52H) are arranged radially inside the second rotor (31, 31A to 31H), so that a small-diameter bearing can be used as the bearing (52, 52A to 52H), and cost reduction can be achieved. In addition, by making good use of the internal space (61, 61 to 61H) of the second rotor (31, 31A to 31H), the magnetic gear motor (1, 1A to 1H) can be reduced in size in the radial direction.

[0391] In the magnetic gear motor (1, 1A, 1D, 1F, 1G, 1H) of the second aspect, according to the first aspect, a plurality of bearings (52, 52A, 52D, 52F, 52G, 52H) are arranged in a row in the direction in which the axis (A1) extends.

[0392] According to this aspect, by configuring the bearing (52, 52A, 52D, 52F, 52G, 52H) as a plurality of bearings, it is possible to ensure high bending rigidity between the rotating shaft (22, 22A, 22D, 22G, 22H) and the second rotor (31, 31A, 31D, 31F, 31G, 31H). Therefore, the number of bearings between the first rotating shaft and the housing, which conventionally required two, can be reduced to one, and as a result, the overall axial length of the magnetic gear motor (1, 1A, 1D, 1F, 1G, 1H) can be shortened.

[0393] In a third aspect of the magnetic gear motor (1, 1A to 1G), according to the first or second aspect, the support shaft (222, 222A to 222G) is connected to the rotating shaft (22, 22A to 22G) so as to rotate integrally with the rotating shaft (22, 22A to 22G).

[0394] According to this aspect, the structure becomes simple, and the assembly of the first rotating body (20, 20A to 20G) and the second rotating body (30, 30A to 30G) becomes easy.

[0395] In a fourth aspect of the magnetic gear motor (1, 1A, 1G), according to any one of the first to third aspects, the first rotor (21, 21A, 21G) is cantilever-supported on the rotating shaft (22, 22A, 22G).

[0396] According to this aspect, the structure becomes simple, and the assembly of the first rotating body (20, 20A, 20G) and the second rotating body (30, 30A, 30G) becomes easy.

[0397] In the fifth form of the magnetic gear motor (1, 1B, 1C, 1E), according to any one of the first to fourth forms, the second rotating body (30, 30B, 30C, 30E) also has a second rotating shaft (32, 32B, 32C, 32E) coaxial with the rotating shaft (22, 22B, 22C, 22E) serving as the first rotating shaft.

[0398] According to this aspect, it becomes easy to detect the rotation speed using the second rotating shaft (32, 32B, 32C, 32E).

[0399] In the magnetic gear motor (1B, 1C, 1E) of a sixth aspect, according to any one of the first, third to fifth aspects, the number of the bearing (52B, 52C, 52E) is one.

[0400] According to this aspect, the number of components can be reduced.

[0401] In the seventh form of the magnetic gear motor (1C~1F), according to any one of the first to third and fifth to sixth forms, the first rotor (21C~21F) has a first end in the axial direction supported by a rotating shaft (22C~22F) and a second end in the axial direction supported by a component other than the rotating shaft so as to be rotatable.

[0402] According to this embodiment, the first rotor (21C to 21F) is supported at both ends, so the rotation of the first rotor (21C to 21F) is stable. Therefore, the number of bearings between the first rotating shaft and the housing, which is two required in the past, can be reduced to one, and as a result, the overall axial length of the magnetic gear motor (1C to 1F) can be shortened.

[0403] In the eighth aspect of the magnetic gear motor (1F-1H), according to the first or second aspect, there is further provided a casing (40F-40H) covering the stator (10F-10H), the first rotating body (20F-20H) and the second rotating body (30F-30H). The support shaft (44F-44H) is connected to the casing (40F-40H) so as to rotate integrally with the casing (40F-40H).

[0404] According to this aspect, by using a part of the casing (40F to 40H) as the support shaft (44F to 44H), the structure of the rotating shaft (22F to 22H) can be simplified.

[0405] In a ninth aspect of the magnetic gear motor (1, 1A to 1G), according to any one of the first to eighth aspects, the stator (10, 10A to 10G), the first rotor (21, 21A to 21G) and the second rotor (31, 31A to 31G) are arranged in a manner including a direction passing through the axis of the rotating shaft (22, 22A to 22G) and perpendicular to the axis, and the stator (10, 10A to 10G), the first rotor (21, 21A to 21G) and the second rotor (31, 31A to 31G) are arranged in this order from a position separated from the axis toward the axis of the rotating shaft (22, 22A to 22G).

[0406] According to this aspect, the inner rotor type magnetic gear motor (1, 1A to 1G) can be miniaturized.

[0407] In a tenth form of a magnetic gear motor (1H), according to any one of the first to eighth forms, the first rotor (21H), the stator (10H) and the second rotor (31H) are arranged in a manner including a direction passing through the axis (A1) of the rotating shaft (22H) and perpendicular to the axis (A1), and are arranged in the order of the first rotor (21H), the stator (10H) and the second rotor (31H) from a position separated from the axis (A1) toward the axis (A1).

[0408] According to this aspect, the outer rotor type magnetic gear motor (1H) can be miniaturized.

[0409] The eleventh embodiment of the magnetic gear (3I) comprises a stator (10I), a first rotating body (20I), a second rotating body (30I), a support shaft (222I) and a bearing (52I). The first rotating body (20I) comprises a cylindrical first rotor (21I) and a rotating shaft (22I) with an axis (A1) as a rotation center. The second rotating body (30I) comprises a second rotor (31I) arranged between the first rotor (21I) and the axis of the rotating shaft (22I). The support shaft (222I) is arranged toward the axis of the rotating shaft (22I) when viewed from the second rotor (31I). The bearing (52I) is arranged between the support shaft (222I) and the second rotor (31I).

[0410] According to this embodiment, the bearing (52I) is arranged radially inside the second rotor (31I), so a small-diameter bearing can be used as the bearing (52I), which can achieve low cost. In addition, by making good use of the internal space (61I) of the second rotor (31I), the magnetic gear (3I) can be miniaturized in the radial direction.

[0411] In the magnetic gear (3I) of a twelfth aspect, according to the eleventh aspect, a plurality of bearings (52I) are arranged in a row in the direction in which the axis (A1) extends.

[0412] According to this embodiment, by configuring the bearing (52I) as a plurality of bearings, a high bending rigidity can be ensured between the first rotating shaft (22I) and the rotor core (33I). Therefore, the number of bearings between the first rotating shaft and the housing, which is two required in the past, can be reduced to one, and as a result, the overall axial length of the magnetic gear (3I) can be shortened.

[0413] In the magnetic gear (3I) of a thirteenth aspect, according to the eleventh or twelfth aspect, the support shaft (222I) is connected to the rotating shaft (22I) so as to rotate integrally with the rotating shaft (22I).

[0414] According to this aspect, the structure becomes simple and the assembly of the first rotating body (20) and the second rotating body (30) becomes easy.

[0415] In a magnetic gear (3I) according to a fourteenth aspect, according to the thirteenth aspect, the first rotor (21I) is cantilever-supported on the rotating shaft (22I).

[0416] According to this embodiment, the structure becomes simple, and the assembly of the first rotating body (20I) and the second rotating body (30I) becomes easy.

[0417] Industrial Applicability

[0418] The magnetic gear motor and magnetic gear disclosed in the present invention can achieve cost reduction. Therefore, the magnetic gear motor and magnetic gear disclosed in the present invention are useful in industry.

[0419] Description of Reference Numerals

[0420] 1, 1A ~ 1H, magnetic gear motor; 3I, magnetic gear; 10, 10A ~ 10I, stator; 20, 20A ~ 20I, first rotating body; 21, 21A ~ 21I, first rotor; 22, 22A ~ 22I, first rotating shaft (rotating shaft); 30, 30A ~ 30I, second rotating body; 31, 31A ~ 31I, second rotor; 32, 32B, 32C, 32E, 32H, 32I, second rotating shaft; 33, 33A ~ 33I, rotor core; 40, 40A ~ 40I, housing; 44F, 44H, 222, 222A ~ 222E, 222G, 222H, 222I, supporting shaft; 51, 51A~51I, 1st bearing (bearing); 52, 52A~52I, 2nd bearing (bearing); 53, 53A, 53B, 53D, 53F, 53G, 53H, 53I, 531C, 531E, 3rd bearing (bearing); 532C, 532E, 4th bearing; 54, 54A, 54D, 54F, 54G, 54H, 54I, 1st small bearing; 55, 55A, 55D, 55F, 55G, 55H, 55I, 2nd small bearing; 61, 61A~61I, internal space; A1, axis.

Claims

1. A magnetic gear motor, wherein: The magnetic gear motor has: stator; A first rotating body having a cylindrical first rotor and a rotating shaft with an axis as a rotation center; a second rotating body having a second rotor disposed between the first rotor and the axis of the rotating shaft; a supporting shaft disposed toward the axis of the rotating shaft when viewed from the second rotor; and A bearing is disposed between the support shaft and the second rotor.

2. The magnetic gear motor according to claim 1, wherein: A plurality of the bearings are arranged in a row in the direction in which the axis extends.

3. The magnetic gear motor according to claim 1 or 2, wherein: The support shaft is connected to the rotating shaft so as to rotate integrally with the rotating shaft.

4. The magnetic gear motor according to claim 3, wherein: The first rotor is cantilever-supported on the rotating shaft.

5. The magnetic gear motor according to claim 1 or 2, wherein: The second rotating body further includes a second rotating shaft coaxial with the rotating shaft serving as the first rotating shaft.

6. The magnetic gear motor according to claim 1, wherein: The number of the bearing is 1.

7. The magnetic gear motor according to claim 1 or 2, wherein: The first rotor has a first end in the axial direction supported by the rotating shaft and a second end in the axial direction rotatably supported by a member other than the rotating shaft.

8. The magnetic gear motor according to claim 1 or 2, wherein: The magnetic gear motor further includes a casing covering the stator, the first rotating body, and the second rotating body. The support shaft is connected to the housing so as to rotate integrally with the housing.

9. The magnetic gear motor according to claim 1 or 2, wherein: The stator, the first rotor, and the second rotor are arranged in a manner including a direction passing through the axis of the rotating shaft and perpendicular to the axis, and are arranged in this order from a position separated from the axis toward the axis.

10. The magnetic gear motor according to claim 1 or 2, wherein: The first rotor, the stator, and the second rotor are arranged in a manner including a direction passing through the axis of the rotating shaft and perpendicular to the axis, and are arranged in this order from a position separated from the axis toward the axis.

11. A magnetic gear, wherein: The magnetic gear has: stator; A first rotating body having a cylindrical first rotor and a rotating shaft with an axis as a rotation center; a second rotating body having a second rotor disposed between the first rotor and the axis of the rotating shaft; a supporting shaft disposed toward the axis of the rotating shaft when viewed from the second rotor; and A bearing is disposed between the support shaft and the second rotor.

12. The magnetic gear according to claim 11, wherein: A plurality of the bearings are arranged in a row in the direction in which the axis extends.

13. The magnetic gear according to claim 11 or 12, wherein: The support shaft is connected to the rotating shaft so as to rotate integrally with the rotating shaft.

14. The magnetic gear according to claim 13, wherein: The first rotor is cantilever-supported on the rotating shaft.

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