Magnetic geared rotating machine

Abstract

Provided is a magnetic geared rotating electrical machine with which long-term reliability of a low-speed rotor is improved.　In a low-speed rotor (3), a plurality of magnetic pole pieces (32) and a plurality of spacers (33) are alternately arranged in a circumferential direction so as to be in contact with one another. The spacers each comprise an outer diameter-side spacer (33a) and an inner diameter-side spacer (33b). The outer diameter-side spacer and the inner diameter-side spacer are fastened in a radial direction by means of a spacer fastening bolt (34). The lateral surface of the magnetic pole piece that is in contact with the outer diameter-side spacer constitutes an outer diameter-side oblique surface (32a) at which the spacing in the circumferential direction between adjacent magnetic pole pieces is wider toward the outer diameter side. The lateral surface of the magnetic pole piece that is in contact with the inner diameter-side spacer constitutes an inner diameter-side oblique surface (32b) at which the spacing in the circumferential direction between adjacent magnetic pole pieces is wider toward the inner diameter side.

Description

Technical Field

[0001] The present application relates to a magnetically geared rotating machine. Background Art

[0002] In wind power generation, tidal power generation and other fields, magnetically geared rotating machines are used as generators that convert kinetic energy obtained from turbines into electrical energy. A magnetically geared rotating machine is composed of three coaxially arranged cylindrical portions. For example, when a magnetically geared rotating machine is used as a generator, the inner cylindrical portion serves as a high-speed rotor provided with a permanent magnet, the middle cylindrical portion serves as a low-speed rotor provided with pole pieces, and the outer cylindrical portion serves as a stator provided with a permanent magnet and armature windings.

[0003] The low-speed rotor of a magnetically geared rotating machine is configured by alternately arranging magnetic pole pieces and non-magnetic spacers in the circumferential direction. In order to increase the transmission torque of the magnetic gear, the radial width of the low-speed rotor is set as small as possible. For example, even in a magnetically geared rotating machine having an overall diameter of several meters, setting the radial width of the low-speed rotor to several tens of millimeters can increase the transmission torque of the magnetic gear. Therefore, the low-speed rotor is required to have rigidity against electromagnetic force and centrifugal force.

[0004] As a conventional magnetically geared rotating machine with increased rigidity of the low-speed rotor, a configuration is disclosed in which the pole pieces and spacers of the low-speed rotor are divided in the axial direction, and they are fixed in the axial direction with a center ring interposed therebetween (see, for example, Patent Document 1). As another magnetically geared rotating machine, a configuration is disclosed in which an annular member is disposed on at least one of the inner diameter side and the outer diameter side of the pole pieces and spacers of the low-speed rotor (see, for example, Patent Document 2). Prior Art Documents Patent Documents

[0005] Patent Document 1 Japanese Unexamined Patent Publication No. 2010-17030 Patent Document 2 Japanese Patent Publication No. 2021-101116 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In conventional magnetic geared rotary machines, the rigidity of the low-speed rotor is improved by applying compressive forces in the axial and radial directions to the magnetic pole pieces and spacers of the low-speed rotor. However, in conventional magnetic geared rotary machines, it is not possible to suppress the relative vibration that occurs between the magnetic pole pieces and spacers of the low-speed rotor. Therefore, conventional magnetic geared rotary machines have the problem of reduced long-term reliability due to wear caused by the relative vibration that occurs between the magnetic pole pieces and spacers of the low-speed rotor.

[0007] This invention was made to solve the above-mentioned problems and aims to provide a magnetic geared rotating machine with improved long-term reliability by suppressing relative vibrations that occur between the magnetic pole pieces and spacers of a low-speed rotor. [Means for solving the problem]

[0008] The magnetic geared rotary machine of the present invention is configured such that a stator having a stator core, stator windings, and stator magnets, a low-speed rotor having magnetic pole pieces and spacers, and a high-speed rotor having a rotor core and rotor magnets are arranged coaxially with a gap between them. The low-speed rotor has multiple magnetic pole pieces and multiple spacers arranged alternately in contact in the circumferential direction. The spacers consist of outer diameter spacers and inner diameter spacers, and the outer diameter spacers and inner diameter spacers are fastened radially with spacer fastening bolts. The side surface of the magnetic pole piece in contact with the outer diameter spacer is an outer diameter slope where the circumferential spacing between adjacent magnetic pole pieces widens toward the outer diameter, and the side surface of the magnetic pole piece in contact with the inner diameter spacer is an inner diameter slope where the circumferential spacing between adjacent magnetic pole pieces widens toward the inner diameter. [Effects of the Invention]

[0009] In the magnetic geared rotating machine of the present invention, a low-speed rotor has multiple magnetic pole pieces and multiple spacers arranged alternately in contact in the circumferential direction. The spacers consist of an outer diameter spacer and an inner diameter spacer, and the outer diameter spacer and the inner diameter spacer are fastened radially with spacer fastening bolts. The side surface of the magnetic pole piece in contact with the outer diameter spacer is an outer diameter slope where the circumferential spacing between adjacent magnetic pole pieces widens toward the outer diameter, and the side surface of the magnetic pole piece in contact with the inner diameter spacer is an inner diameter slope where the circumferential spacing between adjacent magnetic pole pieces widens toward the inner diameter. As a result, relative vibrations occurring between the magnetic pole pieces and spacers of the low-speed rotor can be suppressed, and long-term reliability can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of a magnetic geared rotating machine according to Embodiment 1. [Figure 2] This is a perspective view of the stator, low-speed rotor, and high-speed rotor according to Embodiment 1. [Figure 3] This is an enlarged cross-sectional view of a low-speed rotor according to Embodiment 1. [Figure 4] This is an enlarged top view of the low-speed rotor according to Embodiment 1. [Figure 5] This diagram illustrates the manufacturing process of a low-speed rotor according to Embodiment 1. [Figure 6] This is an enlarged top view of the low-speed rotor according to Embodiment 2. [Figure 7] This is a cross-sectional view of a low-speed rotor according to Embodiment 2. [Figure 8] This is a cross-sectional view of a low-speed rotor according to Embodiment 2. [Figure 9] This is a cross-sectional view of a magnetic geared rotating machine according to Embodiment 2. [Figure 10] This is an enlarged top view of the low-speed rotor according to Embodiment 3. [Figure 11] This is a cross-sectional view of a low-speed rotor according to Embodiment 3. [Figure 12] This is a cross-sectional view of a low-speed rotor according to Embodiment 3. [Figure 13]It is an enlarged top view of the low-speed rotor according to Embodiment 4. [Figure 14] It is a cross-sectional view of the low-speed rotor according to Embodiment 4. [Figure 15] It is a cross-sectional view of the low-speed rotor according to Embodiment 4. [Figure 16] It is an enlarged top view of the low-speed rotor according to Embodiment 5. [Figure 17] It is a cross-sectional view of the low-speed rotor according to Embodiment 5. [Figure 18] It is a cross-sectional view of the low-speed rotor according to Embodiment 5. [Figure 19] It is a cross-sectional view of the magnetically geared rotating machine according to Embodiment 5. [Figure 20] It is a diagram explaining the manufacturing process of the low-speed rotor according to Embodiment 5. [Figure 21] It is an enlarged top view of the low-speed rotor according to Embodiment 6. [Figure 22] It is a cross-sectional view of the low-speed rotor according to Embodiment 6. [Figure 23] It is a cross-sectional view of the low-speed rotor according to Embodiment 6. Description of Embodiments

[0011] Hereinafter, a magnetically geared rotating machine according to an embodiment for carrying out the present application will be described in detail with reference to the drawings. In each drawing, the same reference numerals denote the same or corresponding parts.

[0012] Embodiment 1. Figure 1 is a perspective view of a magnetic geared rotating machine according to Embodiment 1. The magnetic geared rotating machine 10 of this embodiment has a cylindrical frame 1, a stator 2, a low-speed rotor 3, a high-speed rotor 4, and a rotating shaft 5. The stator 2, low-speed rotor 3, and high-speed rotor 4 are arranged coaxially with respect to the rotating shaft 5. The stator 2 is fixed to the frame 1. The high-speed rotor 4 and the rotating shaft 5 are fixed together. The rotating shaft 5 is rotatably supported with respect to the frame 1 via bearings (not shown). The low-speed rotor 3 is rotatably supported on the rotating shaft 5 via bearings provided on the low-speed rotor end plate 31. Hereafter, the direction parallel to the rotating shaft 5 will be referred to as the axial direction, the direction perpendicular to the rotating shaft 5 will be referred to as the radial direction, and the direction of rotation around the rotating shaft 5 will be referred to as the circumferential direction. Furthermore, in the radial direction, the direction away from the rotating shaft 5 will be referred to as the outer diameter side, and the opposite direction will be referred to as the inner diameter side.

[0013] When the magnetic geared rotary machine of this embodiment is used as a generator for wind power generation, the low-speed rotor 3 rotates with the rotation of the wind turbine, and the high-speed rotor 4 rotates at an increased speed, causing an induced current to flow in the stator coil of the stator 2. In the magnetic geared rotary machine 10 of this embodiment, the high-speed rotor 4 may be rotatably supported on the rotating shaft 5 from a fixed part such as a frame via bearings. Alternatively, the high-speed rotor 4 may be rotatably supported on the rotating shaft 5 via bearings from the low-speed rotor.

[0014] Figure 2 is a perspective view of the stator, low-speed rotor, and high-speed rotor according to this embodiment. Figure 2 shows the stator 2, low-speed rotor 3, and high-speed rotor 4 according to this embodiment separated in the axial direction. The stator 2 comprises a stator core 21 with a plurality of slots in the circumferential direction, stator windings 22 and stator magnets 23 arranged in the slots. The stator 2 is fixed to the frame 1 on the inner diameter side of the frame 1. The low-speed rotor 3 has a cylindrical shape and is arranged on the inner diameter side of the stator 2 with an air gap in between. The low-speed rotor 3 is composed of a plurality of pole pieces 32 and spacers 33 arranged alternately in the circumferential direction. The high-speed rotor 4 is arranged on the inner diameter side of the low-speed rotor core with an air gap in between. The high-speed rotor 4 comprises a cylindrical high-speed rotor core 41 and rotor magnets 42 arranged in a circumferential direction on the outer circumferential surface of the high-speed rotor core 41. Note that the rotating shaft 5 fixed to the high-speed rotor core 41 is omitted in Figure 2. Furthermore, Figure 2 shows only the basic structure of the low-speed rotor 3.

[0015] The stator core 21 of the stator 2 and the pole pieces 32 of the low-speed rotor 3 are made of, for example, laminated electromagnetic steel sheets. The spacer 33 of the low-speed rotor 3 is made of a non-magnetic material such as stainless steel or resin. The stator magnets 23 of the stator 2 and the rotor magnets 42 of the high-speed rotor 4 are permanent magnets. Furthermore, the stator windings 22 of the stator 2 are made of insulating coated conductors such as copper, copper alloy, or aluminum.

[0016] Figure 3 is an enlarged cross-sectional view of the low-speed rotor according to this embodiment. Figure 3 is an enlarged view of a part of the low-speed rotor 3. In this embodiment, the spacer 33 arranged between the magnetic pole pieces 32 is composed of an outer diameter side spacer 33a and an inner diameter side spacer 33b. The side surface of the magnetic pole piece 32 in contact with the outer diameter side spacer 33a is an outer diameter side slope 32a, where the circumferential spacing between adjacent magnetic pole pieces widens toward the outer diameter. Furthermore, the side surface of the magnetic pole piece 32 in contact with the inner diameter side spacer 33b is an inner diameter side slope 32b, where the circumferential spacing between adjacent magnetic pole pieces widens toward the inner diameter. As shown in Figure 3, the outer diameter side spacer 33a and the inner diameter side spacer 33b are fastened together with spacer fastening bolts 34. Although not shown, an insulating material is provided on the surfaces where the magnetic pole piece 32 and the spacer 33 are in contact in order to electrically insulate the magnetic pole piece 32 and the spacer 33.

[0017] Figure 4 is an enlarged top view of the low-speed rotor according to this embodiment. Figure 4 is a top view of the low-speed rotor 3 as seen from the radially outside, and shows an enlarged portion of the low-speed rotor 3. In Figure 4, the left-right direction is the axial direction, the up-down direction is the circumferential direction, and the direction perpendicular to the plane of the paper is the radial direction. The low-speed rotor 3 has multiple magnetic pole pieces 32 and spacers 33 that are alternately arranged in the circumferential direction, sandwiched between end rings 35 located at the axial ends. Either the outer diameter side spacer 33a or the inner diameter side spacer 33b, which are fastened with spacer fastening bolts 34, is fixed to the end ring 35 with axial fastening bolts 36. That is, the spacer 33 is fixed to the end ring 35 with axial fastening bolts 36.

[0018] Figure 5 illustrates the manufacturing process of the low-speed rotor in this embodiment. As shown in Figure 5, first, a spacer 33 is fastened to the lower end ring 35 from the axial direction. At this time, the spacer 33 is fastened to the end ring 35 from the axial direction with axial fastening bolts 36. Although not shown in the figure, the outer diameter spacer 33a and the inner diameter spacer 33b that make up the spacer 33 are fastened to the spacer fastening bolts 34 to the extent that they do not separate. Next, a magnetic pole piece 32 is inserted from the axial direction between the spacer 33 fastened to the end ring 35. Next, the upper end ring 35 is placed on top of the spacer 33 and the magnetic pole piece 32. Next, the upper end ring 35 is fastened to the spacer 33 from the axial direction with axial fastening bolts 36. Finally, the outer diameter spacer 33a and the inner diameter spacer 33b are firmly fastened together with spacer fastening bolts 34.

[0019] In the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is fastened axially with axial fastening bolts 36. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are fastened radially with spacer fastening bolts 34.

[0020] Furthermore, in the low-speed rotor 3 of this embodiment, the side surface of the magnetic pole piece 32 in contact with the outer diameter spacer 33a is an outer diameter side slope 32a where the circumferential spacing between adjacent magnetic pole pieces widens toward the outer diameter. Furthermore, the side surface of the magnetic pole piece 32 in contact with the inner diameter spacer 33b is an inner diameter side slope 32b where the circumferential spacing between adjacent magnetic pole pieces widens toward the inner diameter. Therefore, when the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with the spacer fastening bolts 34, the outer diameter spacer 33a and the inner diameter spacer 33b expand circumferentially. As a result, a circumferential compressive force acts on the magnetic pole piece 32. Consequently, relative vibrations occurring between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0021] In this embodiment of the low-speed rotor, an end ring is positioned at the axial end. The end plate of the low-speed rotor may also serve as this end ring. Furthermore, in this embodiment of the low-speed rotor, the spacer is divided into two parts: an outer diameter spacer and an inner diameter spacer. The spacer may be divided into three or more parts in the radial direction.

[0022] Embodiment 2. Figure 6 is an enlarged top view of the low-speed rotor in the magnetic geared rotating machine according to Embodiment 2. The configuration of the magnetic geared rotating machine in this embodiment is the same as that of the magnetic geared rotating machine in Embodiment 1. In the magnetic geared rotating machine of this embodiment, the structure of the low-speed rotor differs from the structure of the low-speed rotor in Embodiment 1.

[0023] As shown in Figure 6, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is added to the structure of the low-speed rotor of Embodiment 1. This axial tightening spacer 33c is installed between the outer diameter spacer 33a, the inner diameter spacer 33b, and one end of the magnetic pole piece 32 and the end ring 35. The axial tightening spacer 33c is annular in shape and is fixed to the inner diameter spacer 33b with a fixing bolt 37.

[0024] Figure 7 is a cross-sectional view of the position shown AA in Figure 6. As shown in Figure 7, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b on the other hand An axial tightening spacer 33c is installed between the end and the end ring 35. This axial tightening spacer 33c is fixed to the inner diameter spacer 33b with a fixing bolt 37.

[0025] Figure 8 is a cross-sectional view of the position shown BB in Figure 6. As shown in Figure 8, in the low-speed rotor 3 of this embodiment, the magnetic pole piece 32 on the other hand An axial tightening spacer 33c is installed between the end and the end ring 35. This axial tightening spacer 33c is fixed to the end ring 35 with an axial fastening bolt 36.

[0026] Figure 9 is a cross-sectional view of a magnetic geared rotary machine according to this embodiment. Figure 9 shows the upper half of the cross-section in a direction parallel to the rotation axis 5. The stator is omitted. As shown in Figure 9, the end rings 35 at both ends of the low-speed rotor 3 are fixed to the low-speed rotor end plates 31. The low-speed rotor end plates 31 are rotatably supported on the rotation axis 5 by bearings 31a. A high-speed rotor 4 is installed on the inner diameter side of the low-speed rotor 3.

[0027] In the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is fastened axially with axial fastening bolts 36. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are fastened radially with spacer fastening bolts 34.

[0028] Furthermore, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34, so a circumferential compressive force acts on the magnetic pole piece 32. As a result, relative vibrations that occur between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0029] Furthermore, in the low-speed rotor 3 of this embodiment, the magnetic pole piece 32 is subjected to radial and circumferential clamping loads from the outer diameter spacer 33a and the inner diameter spacer 33b. In addition, the magnetic pole piece 32 is subjected to an axial clamping load from the end ring 35 and the axial clamping spacer 33c. In other words, in the low-speed rotor 3 of this embodiment, the magnetic pole piece 32 is subjected to loads from three directions: radial, axial, and circumferential, resulting in a gap-free assembly. As a result, the frictional force and restraining force due to the compressive forces from three directions on the magnetic pole piece 32 of the low-speed rotor 3 of this embodiment are increased, improving the assembly rigidity.

[0030] Embodiment 3. Figure 10 is an enlarged top view of the low-speed rotor in a magnetic geared rotating machine according to Embodiment 3. The configuration of the magnetic geared rotating machine in this embodiment is the same as that of the magnetic geared rotating machine in Embodiment 1. In the magnetic geared rotating machine of this embodiment, the structure of the low-speed rotor differs from the structure of the low-speed rotor in Embodiment 1.

[0031] As shown in Figure 10, in the low-speed rotor 3 of this embodiment, one end of the inner diameter spacer 33b is an extended portion 39 that extends to the outer diameter side of the end ring 35. In addition, an end spacer 33d is provided between one end of the magnetic pole piece 32 and the end ring 35. Although an end spacer 33d is provided at one end of all magnetic pole pieces 32, only one is shown in Figure 10.

[0032] Figure 11 is a cross-sectional view of the position shown AA in Figure 10. As shown in Figure 11, one end of the inner diameter spacer 33b in this embodiment is an extended portion 39 that extends to the outer diameter side of the end ring 35. The inner diameter spacer 33b is fixed to the end ring 35 from the radially outside with radial fastening bolts 38. The other end of the inner diameter spacer 33b is fixed to the end ring 35 with axial fastening bolts 36. The outer diameter spacer 33a and the inner diameter spacer 33b are fastened together with spacer fastening bolts 34.

[0033] Figure 12 is a cross-sectional view of the position shown BB in Figure 10. As shown in Figure 12, an end spacer 33d is provided between one end of the magnetic pole piece 32 and the end ring 35. The end spacer 33d extends to the outer diameter side of the end ring 35. The end spacer 33d is fixed to the end ring 35 from the radially outside with radial fastening bolts 38.

[0034] In this configuration, the low-speed rotor 3 can be subjected to circumferential compressive force on the magnetic pole pieces 32 by firmly fastening the outer diameter spacer 33a and the inner diameter spacer 33b with spacer fastening bolts 34. Furthermore, as shown in Figure 11, the spacer 33 can be fastened to the end ring 35 using radial fastening bolts 38 from the radially outside. This improves the workability when assembling the low-speed rotor 3.

[0035] Furthermore, in the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is tightened axially with axial fastening bolts 36. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34.

[0036] Furthermore, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34, so a circumferential compressive force acts on the magnetic pole piece 32. As a result, relative vibrations that occur between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0037] In this embodiment of the low-speed rotor, one end of the inner diameter spacer extends to the outer diameter side of the end ring. Alternatively, one end of the outer diameter spacer may extend to the outer diameter side of the end ring. In either configuration, the spacer can be fastened to the end ring from the radially outside using radial fastening bolts. This improves the workability when assembling the low-speed rotor.

[0038] Furthermore, in the low-speed rotor of this embodiment, one end of the inner diameter spacer extends to the outer diameter side of the end ring. Alternatively, both ends of the inner diameter spacer 33b may extend to the outer diameter side of the end ring. Even with this configuration, the spacer can be fastened to the end ring from the radially outside using radial fastening bolts. This improves the workability when assembling the low-speed rotor.

[0039] Embodiment 4. Figure 13 is an enlarged top view of the low-speed rotor in a magnetic geared rotating machine according to Embodiment 4. The configuration of the magnetic geared rotating machine in this embodiment is the same as that of the magnetic geared rotating machine in Embodiment 1. In the magnetic geared rotating machine of this embodiment, the structure of the low-speed rotor differs from the structure of the low-speed rotor in Embodiment 1.

[0040] As shown in Figure 13, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is added to the structure of the low-speed rotor of Embodiment 3. This axial tightening spacer 33c is installed between the outer diameter spacer 33a, the inner diameter spacer 33b, and the other end of the magnetic pole piece 32 and the end ring 35. The axial tightening spacer 33c is annular in shape and is fixed to the inner diameter spacer 33b with a fixing bolt 37.

[0041] Figure 14 is a cross-sectional view of the position shown AA in Figure 13. As shown in Figure 14, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed between the other end of the outer diameter spacer 33a and the inner diameter spacer 33b and the end ring 35. This axial tightening spacer 33c is fixed to the inner diameter spacer 33b with fixing bolts 37.

[0042] Figure 15 is a cross-sectional view of the position shown at BB in Figure 13. As shown in Figure 15, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed between the other end of the magnetic pole piece 32 and the end ring 35. This axial tightening spacer 33c is fixed to the end ring 35 with an axial fastening bolt 36.

[0043] In the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is fastened axially with axial fastening bolts 36. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are fastened radially with spacer fastening bolts 34.

[0044] Furthermore, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34, so a circumferential compressive force acts on the magnetic pole piece 32. As a result, relative vibrations that occur between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0045] Furthermore, in the low-speed rotor 3 of this embodiment, the inner diameter spacer 33b is fixed to the end ring 35 from the radially outer side using radial fastening bolts 38, which improves the workability when assembling the low-speed rotor 3.

[0046] Furthermore, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed between the outer diameter spacer 33a, the inner diameter spacer 33b, and the other end of the magnetic pole piece 32 and the end ring 35, so that a uniform axial tightening load is applied to the spacer 33 and the magnetic pole piece 32.

[0047] Embodiment 5. Figure 16 is an enlarged top view of the low-speed rotor in a magnetic geared rotating machine according to Embodiment 5. The configuration of the magnetic geared rotating machine in this embodiment is the same as that of the magnetic geared rotating machine in Embodiment 1. In the magnetic geared rotating machine of this embodiment, the structure of the low-speed rotor differs from that of the low-speed rotor in Embodiment 1.

[0048] As shown in Figure 16, in the low-speed rotor 3 of this embodiment, an axial clamping spacer 33c is added to the structure of the low-speed rotor of Embodiment 3. This axial clamping spacer 33c is installed on the axially outer side of the outer diameter spacer 33a, the inner diameter spacer 33b, and the other end of the magnetic pole piece 32. The end ring 35 is installed on the inner diameter side of this axial clamping spacer 33c. The axial clamping spacer 33c is annular in shape and is fixed to the inner diameter spacer 33b with fixing bolts 37. Furthermore, the axial clamping spacer 33c is fixed to the end ring 35 with radial fastening bolts 38.

[0049] Figure 17 is a cross-sectional view of the position shown AA in Figure 16. As shown in Figure 17, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed on the axially outward side of the other end of the outer diameter spacer 33a and the inner diameter spacer 33b. This axial tightening spacer 33c is fixed to the inner diameter spacer 33b with a fixing bolt 37.

[0050] Figure 18 is a cross-sectional view of the position shown at BB in Figure 16. As shown in Figure 18, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed on the axially outer side of the other end of the magnetic pole piece 32. This axial tightening spacer 33c is fixed to the end ring 35 with radial fastening bolts 38.

[0051] Figure 19 is a cross-sectional view of a magnetic geared rotary machine according to this embodiment. Figure 19 shows the upper half of the cross-section in a direction parallel to the rotation axis 5. The stator is omitted. As shown in Figure 19, the end rings 35 at both ends of the low-speed rotor 3 are fixed to the low-speed rotor end plates 31. The low-speed rotor end plates 31 are rotatably supported on the rotation axis 5 by bearings 31a. A high-speed rotor 4 is installed on the inner diameter side of the low-speed rotor 3.

[0052] Figure 20 illustrates the manufacturing process of the low-speed rotor in this embodiment. As shown in Figure 20(a), first, the inner diameter spacer 33b is fastened to the end ring 35 from the radially outside. At this time, the inner diameter spacer 33b is fastened to the end ring 35 from the radially outside with radial fastening bolts 38 at the extension portion 39. Next, although not shown, the magnetic pole piece 32 is inserted between the inner diameter spacers 33b from the radially outside. Next, as shown in Figure 20(b), the outer diameter spacer 33a is inserted from the radially outside, and the outer diameter spacer 33a and the inner diameter spacer 33b are firmly fastened together with spacer fastening bolts 34. Finally, as shown in Figure 20(c), the axial tightening spacer 33c is inserted from the axially outside, and this axial tightening spacer 33c is fixed to the inner diameter spacer 33b from the axially outside with fixing bolts 37.

[0053] In the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is tightened in the axial direction by the axial tightening spacer 33c. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially by the spacer fastening bolt 34.

[0054] Furthermore, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34, so a circumferential compressive force acts on the magnetic pole piece 32. As a result, relative vibrations that occur between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0055] Furthermore, in the low-speed rotor 3 of this embodiment, the inner diameter spacer 33b and the axial tightening spacer 33c are fixed to the end ring 35 from the radial outside using radial fastening bolts 38, which improves the workability when assembling the low-speed rotor 3.

[0056] Embodiment 6. Figure 21 is an enlarged top view of the low-speed rotor in a magnetic geared rotating machine according to Embodiment 6. The configuration of the magnetic geared rotating machine in this embodiment is the same as that of the magnetic geared rotating machine in Embodiment 1. In the magnetic geared rotating machine of this embodiment, the structure of the low-speed rotor differs from that of the low-speed rotor in Embodiment 1.

[0057] As shown in Figure 21, in the low-speed rotor 3 of this embodiment, the extended portion 39 that extends to the outer diameter side of the end ring 35 at one end of the two inner diameter side spacers 33b arranged in the circumferential direction, as in the low-speed rotor of Embodiment 5, is integrated with the end spacer 33d provided between one end of the magnetic pole piece 32 and the end ring 35. In other words, in the low-speed rotor of this embodiment, circumferentially adjacent extended portions 39 are connected to each other. The end spacer 33d, which is integrated with the extended portion 39, is fixed to the end ring 35 from the radially outside with radial fastening bolts 38.

[0058] Figure 22 is a cross-sectional view of the position shown AA in Figure 21. As shown in Figure 22, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed on the axially outer side of the other end of the outer diameter spacer 33a and the inner diameter spacer 33b. This axial tightening spacer 33c is fixed to the inner diameter spacer 33b with fixing bolts 37. The end ring 35 of the other end is installed on the inner diameter side of the axial tightening spacer 33c.

[0059] Figure 23 is a cross-sectional view of the position shown at BB in Figure 21. As shown in Figure 23, in the low-speed rotor 3 of this embodiment, an axial tightening spacer 33c is installed on the axially outer side of the other end of the magnetic pole piece 32. This axial tightening spacer 33c is fixed to the end ring 35 with radial fastening bolts 38.

[0060] In the low-speed rotor 3 configured in this way, the axial rigidity is improved because the spacer 33 is fastened axially with axial fastening bolts 36. In addition, the radial rigidity is improved because the outer diameter spacer 33a and the inner diameter spacer 33b are fastened radially with spacer fastening bolts 34.

[0061] Furthermore, in the low-speed rotor 3 of this embodiment, the outer diameter spacer 33a and the inner diameter spacer 33b are tightened radially with spacer fastening bolts 34, so a circumferential compressive force acts on the magnetic pole piece 32. As a result, relative vibrations that occur between the magnetic pole piece 32 and the spacer 33 can be suppressed.

[0062] Furthermore, in the low-speed rotor 3 of this embodiment, the inner diameter spacer 33b and the axial tightening spacer 33c are fixed to the end ring 35 from the radial outside using radial fastening bolts 38, which improves the workability when assembling the low-speed rotor 3. In addition, since the two inner diameter spacers 33b, which are arranged in the circumferential direction, are integrated, the number of parts is reduced.

[0063] In this embodiment of the low-speed rotor, the extended portion extending to the outer diameter side of the end ring at one end of the two inner diameter spacers arranged in the circumferential direction is integrated with the end spacer provided between one end of the magnetic pole piece and the end ring. Alternatively, the extended portion extending to the outer diameter side of the end ring at one end of three or more inner diameter spacers arranged in the circumferential direction may be integrated with the end spacer provided between one end of the magnetic pole piece and the end ring. This configuration further reduces the number of parts.

[0064] Although this application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but can be applied individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the art disclosed herein. These include, for example, modifying, adding or omitting at least one component, or even extracting at least one component and combining it with components of other embodiments. [Explanation of symbols]

[0065] 1 Frame, 2 Stator, 3 Low-speed rotor, 4 High-speed rotor, 10 Magnetic geared rotating machine, 21 Stator core, 22 Stator winding, 23 Stator magnet, 31 Low-speed rotor end plate, 31a Bearing, 32 Magnetic pole piece, 32a Outer diameter side slope, 32b Inner diameter side slope, 33 Spacer, 33a Outer diameter side spacer, 33b Inner diameter side spacer, 33c Axial clamping spacer, 33d End spacer, 34 Spacer fastening bolt, 35 End ring, 36 Axial fastening bolt, 37 Fixing bolt, 38 Radial fastening bolt, 39 Extension section, 41 High-speed rotor core, 42 Rotor magnet.

Claims

1. A magnetic geared rotary machine is configured in which a stator having a stator core, stator windings, and stator magnets, a low-speed rotor having magnetic pole pieces and spacers, and a high-speed rotor having a rotor core and rotor magnets are each arranged coaxially with a gap between them, The low-speed rotor is characterized in that a plurality of the pole pieces and a plurality of the spacers are arranged alternately in contact in the circumferential direction, the spacers consist of an outer diameter spacer and an inner diameter spacer, the outer diameter spacer and the inner diameter spacer are fastened radially with spacer fastening bolts, the side surface of the pole piece in contact with the outer diameter spacer is an outer diameter slope where the circumferential spacing between adjacent pole pieces widens toward the outer diameter, and the side surface of the pole piece in contact with the inner diameter spacer is an inner diameter slope where the circumferential spacing between adjacent pole pieces widens toward the inner diameter.

2. The low-speed rotor further includes end rings at its axial ends. The magnetic geared rotating machine according to claim 1, wherein at least one axial end of the outer diameter side spacer and the inner diameter side spacer of the spacer has an extended portion that extends to the outer diameter side of the end ring, and the spacer is fastened to the end ring from the radially outer side of the extended portion with radial fastening bolts.

3. The magnetic geared rotating machine according to claim 2, characterized in that the extended portions are connected to each other in the circumferential direction.

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