Rotating device

Abstract

The present invention provides a rotation device in which the rigidness of an intermediate cylindrical part is improved.　Provided is a rotation device (1) in which an inner cylindrical part (10), an intermediate cylindrical part (20), and an outer cylindrical part (30) are disposed concentrically and are centered about a rotation shaft (40), wherein: the intermediate cylindrical part is provided with an annular part (23) in which pole pieces and spacers that are each constituted by continuous bodies along the rotation shaft are disposed alternatingly in the circumferential direction, and a reinforcing ring (24) which supports the annular part; the reinforcing ring is disposed on the inner diameter side of the annular part; and an outer circumferential surface of the reinforcing ring is fastened to an inner circumferential surface of the spacer.

Description

[Technical Field]

[0001] The present application relates to a rotating device. [Background technology]

[0002] Rotating devices with a triple-cylindrical structure, consisting of an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion, are known. In such rotating devices, each of the three cylindrical portions functions as a stator or a rotor. For example, a rotating device in which the intermediate cylindrical portion serves as the stator and the inner and outer cylindrical portions serve as the rotors is called a magnetic gear device. In magnetic gear devices, rotational torque is transmitted between the inner and outer cylindrical portions via the intermediate cylindrical portion, which is provided with magnetic pole pieces. For this reason, magnetic gear devices are used in applications such as wind turbine speed-up gears and automobile transmissions. Rotating devices in which the outer cylindrical portion serves as the stator and the inner and intermediate cylindrical portions serve as the rotors are called magnetic-geared rotating electric machines. In magnetic-geared rotating electric machines, when the intermediate cylindrical portion, which is provided with magnetic pole pieces, is rotated by external power, the inner cylindrical portion, which is provided with magnets, rotates at a predetermined speed-up ratio. In such magnetic-geared rotating electric machines, a change in magnetic flux due to the rotation of the inner cylindrical portion generates a current in a coil provided in the outer cylindrical portion. For this reason, magnetic-geared rotating electric machines are used in generators of wind power generation equipment, for example.

[0003] In a rotating device having a triple-cylindrical structure, the radial width of the intermediate cylindrical portion is reduced to strengthen the magnetic coupling between the inner cylindrical portion and the outer cylindrical portion. The intermediate cylindrical portion also has magnetic pole pieces arranged circumferentially. These pole pieces are constructed by axially stacking magnetic materials such as electromagnetic steel sheets. In a magnetic gear device in which the intermediate cylindrical portion serves as the stator, the magnetic pole pieces of the intermediate cylindrical portion are subjected to radial electromagnetic forces and gravity due to their own weight. In a magnetic-geared rotating electric machine in which the intermediate cylindrical portion serves as the rotor, the magnetic pole pieces of the intermediate cylindrical portion are subjected to radial electromagnetic forces, gravity due to their own weight, and centrifugal forces due to rotation. Therefore, the intermediate cylindrical portion is required to have sufficient rigidity to prevent deformation due to the electromagnetic forces acting on the magnetic pole pieces and gravity due to their own weight.

[0004] One conventional rotating device that addresses this problem is one that includes an intermediate cylindrical section in which connecting members and pole pieces, arranged alternately in the circumferential direction, are fastened in the axial direction via a reinforcing ring. The reinforcing ring, together with the connecting members, is connected to end plates arranged at both ends of the intermediate cylindrical section by through-bolts. In this rotating device, the outer periphery of the reinforcing ring is provided with protrusions that contact the connecting members and pole pieces from the radially outer side. By providing such protrusions, even if centrifugal force acts radially outward on the connecting members and pole pieces, the centrifugal force can be transmitted to the end plates via the protrusions provided on the reinforcing ring. As a result, the rigidity of the intermediate cylindrical section can be increased (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-17029 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in conventional rotating devices, when electromagnetic and centrifugal forces act on the intermediate cylindrical portion, a bending load acts on the through bolts that connect the reinforcing member and the connecting member. Therefore, when strong electromagnetic and centrifugal forces act on the intermediate cylindrical portion, the bending load acting on the through bolts may cause deformation of the intermediate cylindrical portion.

[0007] The present application has been made to solve the above-mentioned problems, and has an object to provide a rotation device in which the rigidity of the intermediate cylindrical portion is improved. [Means for solving the problem]

[0008] The rotating device of the present application has an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion arranged concentrically around the rotation axis, and the intermediate cylindrical portion has an annular portion in which magnetic pole pieces and spacers formed of a continuum along the rotation axis are alternately arranged in the circumferential direction, and a reinforcing ring that supports the annular portion. The reinforcing ring is arranged on the inner diameter side of the annular portion, and the outer peripheral surface of the reinforcing ring is fastened to the inner peripheral surface of the spacer. The inner cylindrical portion has a cylindrical inner cylindrical core and a plurality of inner cylindrical magnets arranged in a line in the circumferential direction on the outer peripheral surface of the inner cylindrical core, and the inner cylindrical magnets are divided into a plurality of pieces in the axial direction, and the inner diameter side end of the reinforcing ring is located on the inner diameter side of the outer diameter side end of the inner cylindrical core. are. [Effects of the Invention]

[0009] In the rotating device of the present application, a reinforcing ring is disposed on the inner diameter side of the annular portion, and the outer circumferential surface of the reinforcing ring is fastened to the inner circumferential surface of the spacer. The inner cylindrical portion has a cylindrical inner cylindrical core and a plurality of inner cylindrical magnets arranged in a line in the circumferential direction on the outer peripheral surface of the inner cylindrical core, and the inner cylindrical magnets are divided into a plurality of pieces in the axial direction, and the inner diameter side end of the reinforcing ring is located on the inner diameter side of the outer diameter side end of the inner cylindrical core. Therefore, the rigidity of the intermediate cylindrical portion can be improved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a rotation device according to a first embodiment. [Figure 2] 1 is a cross-sectional view of a rotation device according to a first embodiment. [Figure 3] 1 is an exploded perspective view of a rotation device according to a first embodiment. [Figure 4] FIG. 10 is a cross-sectional view of a rotation device according to a second embodiment. [Figure 5] FIG. 10 is a cross-sectional view of a rotation device according to a second embodiment. [Figure 6] FIG. 10 is an exploded perspective view of a rotation device according to a second embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a rotation device according to a third embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a rotation device according to a fourth embodiment. [Figure 9] FIG. 10 is a cross-sectional view of a rotation device according to a fifth embodiment. [Figure 10] FIG. 13 is a cross-sectional view of a rotation device according to a sixth embodiment. [Figure 11] FIG. 13 is a perspective view of an intermediate cylindrical portion of a rotation device according to a seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Rotation devices according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or corresponding parts.

[0012] Embodiment 1 1 and 2 are cross-sectional views of a rotating device according to a first embodiment. FIG. 1 is a cross-sectional view of a plane perpendicular to the rotation axis of the rotating device 1. FIG. 2 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device 1. In this embodiment, the rotating device 1 is a magnetic gear device. The rotating device 1 of this embodiment includes an inner cylindrical portion 10, an intermediate cylindrical portion 20 disposed on the outer circumferential side of the inner cylindrical portion 10 across a gap, and an outer cylindrical portion 30 disposed on the outer circumferential side of the intermediate cylindrical portion 20 across a gap. The inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 are concentrically arranged around a rotation axis 40. Note that in FIGS. 1 and 2, a case for accommodating the inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 is omitted.

[0013] The rotating shaft 40 has a cylindrical shape. The direction parallel to the rotating shaft 40 is called the axial direction, the direction perpendicular to the rotating shaft 40 is called the radial direction, and the direction in which the rotating shaft rotates is called the circumferential direction. The inner diameter side is the direction approaching the rotating shaft 40 in the radial direction, and the outer diameter side is the direction away from the rotating shaft 40 in the radial direction.

[0014] The inner cylindrical portion 10 has an inner cylindrical core 11 and inner cylindrical magnets 12 arranged side by side in the circumferential direction on the outer circumferential surface of the inner cylindrical core 11. The inner cylindrical core 11 is fastened to a rotating shaft 40. The inner cylindrical magnets 12 are permanent magnets. The inner cylindrical magnets 12 have south and north poles arranged alternately in the circumferential direction and are divided in the axial direction. The inner cylindrical core 11 is made of a magnetic material such as electromagnetic steel plates stacked in the axial direction.

[0015] The intermediate cylindrical portion 20 includes an annular portion 23 formed by alternatingly circumferentially arranged spacers 21 and pole pieces 22, and a reinforcing ring 24 supporting the annular portion 23 from its inner circumferential surface. The intermediate cylindrical portion 20 also includes end plates 25 at both axial ends. The annular portion 23, which is formed by the spacers 21 and pole pieces 22, is supported by the end plates 25 at both axial ends. The end plates 25 are connected to the rotating shaft 40 via bearings 26. The pole pieces 22 are made of a magnetic material, such as axially laminated electromagnetic steel plates. The spacers 21, reinforcing ring 24, and end plates 25 are made of a non-magnetic material, such as austenitic stainless steel, aluminum, or resin.

[0016] The outer cylindrical portion 30 has a cylindrical outer cylindrical core 31 and outer cylindrical magnets 32 arranged side by side in the circumferential direction on the inner circumferential surface of the outer cylindrical core 31. The outer cylindrical magnets 32 are permanent magnets. The outer cylindrical magnets 32 have south and north poles arranged alternately in the circumferential direction. The outer cylindrical core 31 is made of a magnetic material such as electromagnetic steel plates laminated in the axial direction.

[0017] FIG. 3 is an exploded perspective view of the rotating device 1 of this embodiment. Note that the end plate 25 and bearing 26 of the intermediate cylindrical portion 20 are omitted in FIG. 3. In the rotating device 1 of this embodiment, the inner cylindrical magnet 12 is divided into 14 pieces circumferentially and 4 pieces axially. However, the inner cylindrical magnet 12 does not necessarily have to be divided axially. The annular portion 23 of the intermediate cylindrical portion 20 is configured by alternatingly circumferentially arranged pole pieces 22 divided into 24 pieces circumferentially and spacers 21 formed as a continuum along the rotation axis. Three reinforcing rings 24 are arranged on the inner diameter side of the annular portion 23. Furthermore, the outer cylindrical magnet 32 ​​is divided into 18 pieces circumferentially.

[0018] The rotating device 1 of this embodiment is a magnetic gear device. Therefore, the intermediate cylindrical portion 20 is a stator, and the inner cylindrical portion 10 and the outer cylindrical portion 30 are rotors. Therefore, the inner cylindrical portion 10 rotates together with the rotating shaft 40. The outer cylindrical portion 30 and the inner cylindrical portion 10 rotate relative to each other. The intermediate cylindrical portion 20 is fixed to a case or the like via an end plate 25. Although not shown, the outer cylindrical portion 30 is rotatably supported on the rotating shaft 40 via a bearing. For example, when the inner cylindrical portion 10 is rotated by external power, attractive and repulsive forces act between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 ​​via the magnetic pole piece 22 of the intermediate cylindrical portion 20. The attractive and repulsive forces acting between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 ​​transmit the rotational torque of the inner cylindrical portion 10 to the rotational torque of the outer cylindrical portion 30.

[0019] In the magnetic gear device, when the inner cylindrical portion 10 and the outer cylindrical portion 30 rotate, an electromagnetic force acts radially on the intermediate cylindrical portion 20 due to the magnetic forces of the inner cylindrical magnet 12 and the outer cylindrical magnet 32. Furthermore, when the magnetic gear device is used as a speed increaser for a wind turbine generator, the outer diameter of the intermediate cylindrical portion 20 is 10 mm or more, and the radial thickness of the annular portion 23 is approximately 40 mm. Therefore, the gravitational force acting on the intermediate cylindrical portion 20 due to its own weight cannot be ignored. As a result, the intermediate cylindrical portion 20 may be deformed by the electromagnetic force and gravity. In particular, both axial ends of the intermediate cylindrical portion 20 are fixed by end plates and are therefore less likely to deform, but the central portion in the axial direction is more likely to deform radially.

[0020] 2 and 3, in the rotating device of this embodiment, the reinforcing ring 24 is disposed on the inner diameter side of the annular portion 23, and the outer circumferential surface of the reinforcing ring 24 is fastened to the inner circumferential surface of the spacer 21 disposed between the pole pieces 22. In other words, the inner circumferential surface of the spacer 21, which has the pole pieces 22 on both circumferential sides, is fastened to the outer circumferential surface of the reinforcing ring 24. In an intermediate cylindrical portion configured in this manner, even when electromagnetic force and gravity act radially on the reinforcing ring 24, the circumferential stress generated in the reinforcing ring 24 is reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0021] Here, the spacer 21 is configured as a continuous, seamless piece extending from the end plate 25 at one end in the axial direction to the end plate 25 at the other end. That is, the spacer 21 is configured as a continuous piece extending along the rotation axis. The spacer 21 configured in this manner has higher rigidity than a spacer that is divided along the axial direction and has a joint, thereby improving the rigidity of the intermediate cylindrical portion.

[0022] Regarding the radial thickness of the spacer 21, the thickness of the portion fastened to the reinforcing ring 24 may be thicker than the thickness of other portions. By doing so, stress generated in the fastening portion between the spacer and the reinforcing ring is reduced, and the rigidity of the intermediate cylindrical portion can be improved.

[0023] The spacer 21 and the reinforcing ring 24 are fastened together using a fastening method that can transmit the radially outward load acting on the spacer 21 to the reinforcing ring 24. Fastening methods that can be used include, for example, mechanical fastening methods such as bolting, riveting, and caulking, material fastening methods such as welding, pressure welding, friction welding, and solid-state welding, and chemical fastening methods such as adhesive bonding and vapor deposition. Note that the spacer 21 and the reinforcing ring 24 may be an integral structure.

[0024] Here, we will explain the relationship between radial displacement δ and internal pressure P when internal pressure P is applied to a cylinder with radial thickness t, average radius r, and material modulus of longitudinal elasticity E. The average radius is the average of the radius of the innermost and outermost surfaces of the cylinder. The relationship between δ and P for this cylinder is given by the following equation (1). δ = (P×r 2 ) / (t×E) (1)

[0025] As shown in equation (1), the radial displacement δ is proportional to the square of the mean radius r. Assuming that the radially outward load acting on the intermediate cylindrical portion corresponds to the internal pressure acting on the intermediate cylindrical portion, it can be seen that, if the radial thickness of the reinforcing ring is constant, the smaller the mean radius of the reinforcing ring, the smaller the radial displacement. In the rotating device of this embodiment, fastening the reinforcing ring 24 to the inner circumferential surface of the spacer 21 can reduce the mean radius of the reinforcing ring 24. This reduces the displacement of the reinforcing ring 24, thereby improving the rigidity of the intermediate cylindrical portion. Furthermore, equation (1) also shows that further reducing the radius of the innermost circumferential surface of the reinforcing ring 24 further reduces the mean radius, thereby further improving the rigidity of the intermediate cylindrical portion.

[0026] As a comparative example of the rotating device of the present embodiment, consider a rotating device having an intermediate cylindrical portion in which annular portions divided into multiple axial segments are fastened in the axial direction via reinforcing links. In this comparative rotating device, the annular portions and the reinforcing links are fastened in the axial direction with bolts or the like. In this comparative rotating device, the electromagnetic force acting on the intermediate cylindrical portion acts in a direction intersecting the fastening direction of the bolts. As a result, a bending load acts on the fastened portions. In other words, in the intermediate cylindrical portion of the comparative rotating device, the direction in which the fastening force of the fastening portions acts intersects with the direction in which the load acts. As a result, in the comparative rotating device, the fastening force of the fastening portions is weak as a resistance force against the load.

[0027] In contrast, in the rotating device of this embodiment, the annular portion and the reinforcing link are fastened together in the radial direction. Therefore, the electromagnetic force acting on the intermediate cylindrical portion acts in a direction parallel to the fastening direction. This results in a tensile load acting on the fastened portion. That is, in the intermediate cylindrical portion of the rotating device of this embodiment, the direction in which the fastening force of the fastened portion acts is parallel to the direction in which the load acts. As a result, in the rotating device of this embodiment, the fastening force of the fastened portion acts directly as a resistance force against the load, thereby improving the rigidity of the intermediate cylindrical portion. In particular, high-strength fastening methods such as bolt fastening, which exert a fastening force in the axial direction, are effective.

[0028] Preferably, both axial ends of the spacer are fastened to the end plates with an axial tension applied. For example, in an annular section in which spacers and pole pieces are alternately arranged in the circumferential direction, the axial length of the pole pieces before the end plates are attached is set longer than the axial length of the spacers, within the spacer's elastic deformation range. Then, the end plates and spacers are fastened together while compressing the pole pieces with the end plates from both axial ends. The end plates and spacers can be fastened together by, for example, bolting or welding. In the intermediate cylindrical section assembled in this manner, an axial compression force acts on the pole pieces and an axial tension force acts on the spacers. In the intermediate cylindrical section configured in this manner, even in the case of pole pieces made of laminated electromagnetic steel sheets, the laminated structure of the electromagnetic steel sheets can be maintained without employing any special structure for maintaining the laminated structure.

[0029] 2, it is preferable that the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 is located more inwardly than the outer diameter side end of the inner cylindrical magnet 12 of the inner cylindrical portion 10. With this configuration, the gap between the inner cylindrical magnet 12 of the inner cylindrical portion 10 and the pole piece 22 of the intermediate cylindrical portion 20 becomes smaller, which increases the rigidity of the reinforcing ring 24 and prevents a decrease in torque conversion efficiency.

[0030] In the rotating device of this embodiment, the inner cylindrical portion, which is the rotor, is fastened to the rotating shaft. Alternatively, the intermediate cylindrical portion, which is the stator, may be fastened to the rotating shaft, and the inner and outer cylindrical portions, which are the rotor, may be rotatably supported on the rotating shaft via bearings. In this case, the rotating shaft is fixed and does not rotate. In addition, in the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient to have one or more.

[0031] Embodiment 2 4 and 5 are cross-sectional views of a rotating device according to a second embodiment. FIG. 4 is a cross-sectional view of a plane perpendicular to the rotation axis of the rotating device 1. FIG. 5 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device. In this embodiment, the rotating device 1 is a magnetic-geared rotating electric machine. The rotating device 1 of this embodiment includes an inner cylindrical portion 10, an intermediate cylindrical portion 20 arranged on the outer circumferential side of the inner cylindrical portion 10 with a gap therebetween, and an outer cylindrical portion 30 arranged on the outer circumferential side of the intermediate cylindrical portion 20 with a gap therebetween. The inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 are arranged concentrically around the rotation axis 40. Note that in FIGS. 4 and 5, a case and the like that house the inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 are omitted.

[0032] The inner cylindrical portion 10 and the intermediate cylindrical portion 20 have the same configuration as the rotating device of embodiment 1. The outer cylindrical portion 30 has a cylindrical outer cylindrical core 31, an outer cylindrical magnet 32, and an outer cylindrical coil 33. The outer cylindrical core 31 has a plurality of teeth 31a that protrude from a cylindrical core back toward the inner diameter side. Slots are formed between the plurality of teeth 31a. The outer cylindrical coil 33 is wound around the teeth 31a using these slots. The outer cylindrical magnet 32 ​​is disposed in the slot on the inner diameter side of the outer cylindrical coil 33.

[0033] FIG. 6 is an exploded perspective view of the rotating device 1 of this embodiment. The end plates 25 and bearings 26 of the intermediate cylindrical portion 20 are omitted from FIG. 6 . To avoid complication, the outer cylindrical coil 33 is also omitted from FIG. 6 . In the rotating device 1 of this embodiment, the inner cylindrical magnet 12 is divided into 14 pieces in the circumferential direction and 4 pieces in the axial direction. The annular portion 23 of the intermediate cylindrical portion 20 is configured with 24 magnetic pole pieces 22 divided into circumferential pieces and spacers 21 formed as a continuous body along the rotation axis, arranged alternately in the circumferential direction. Three reinforcing rings 24 are arranged on the inner periphery of the annular portion 23. Eighteen outer cylindrical magnets 32 and eighteen outer cylindrical coils 33 are arranged in the circumferential direction.

[0034] The rotating device 1 of this embodiment is a magnetic-geared rotating electric machine. Therefore, the outer cylindrical portion 30 is a stator, the inner cylindrical portion 10 is a high-speed rotor, and the intermediate cylindrical portion 20 is a low-speed rotor. Therefore, the inner cylindrical portion 10 rotates together with the rotating shaft 40, and the intermediate cylindrical portion 20 is rotatably supported on the rotating shaft 40 via a bearing 26. Although not shown, the outer cylindrical portion 30 is fixed to a case. For example, when the intermediate cylindrical portion 20 is rotated by external power, attractive and repulsive forces act between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 ​​via the magnetic pole pieces 22 of the intermediate cylindrical portion 20. The attractive and repulsive forces acting between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 ​​transmit the rotational torque of the intermediate cylindrical portion 20 to the rotational torque of the inner cylindrical portion 10.

[0035] In a magnetic-geared rotating electric machine, when the intermediate cylindrical portion 20 rotates, an electromagnetic force acts radially on the intermediate cylindrical portion 20 due to the magnetic forces of the inner cylindrical magnet 12 and the outer cylindrical magnet 32. Centrifugal force also acts on the intermediate cylindrical portion 20. Furthermore, if the intermediate cylindrical portion 20 is large, the effect of gravity due to its own weight cannot be ignored. As a result, the intermediate cylindrical portion 20 may be deformed by the electromagnetic force, centrifugal force, and gravity. In particular, both axial ends of the intermediate cylindrical portion 20 are fixed by end plates and are therefore less likely to deform, but the central portion in the axial direction is more likely to deform radially.

[0036] 5 and 6, in the rotating device of this embodiment, the reinforcing ring 24 is disposed on the inner diameter side of the annular portion 23, and the outer circumferential surface of the reinforcing ring 24 is fastened to the inner circumferential surface of the spacer 21 disposed between the pole pieces 22. In other words, the inner circumferential surface of the spacer 21, which has the pole pieces 22 on both circumferential sides, is fastened to the outer circumferential surface of the reinforcing ring 24. In an intermediate cylindrical portion configured in this manner, even when electromagnetic force, centrifugal force, and gravity act radially on the reinforcing ring 24, the circumferential stress generated in the reinforcing ring 24 is reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0037] In the rotation device of this embodiment, similarly to the first embodiment, the average radius of the reinforcing ring 24 can be reduced by fastening the reinforcing ring 24 to the inner peripheral surface of the spacer 21. This reduces the displacement of the reinforcing ring 24, thereby improving the rigidity of the intermediate cylindrical portion.

[0038] Furthermore, in the rotating device of this embodiment, as in the first embodiment, the annular portion and the reinforcing link are fastened together along the radial direction. Therefore, the electromagnetic force, centrifugal force, and gravity acting on the intermediate cylindrical portion act in a direction parallel to the fastening direction. This results in a tensile load acting on the fastened portion. That is, in the intermediate cylindrical portion of the rotating device of this embodiment, the direction in which the fastening force of the fastened portion acts is parallel to the direction in which the load acts. As a result, in the rotating device of this embodiment, the fastening force of the fastened portion acts directly as a resistance force against the load, thereby improving the rigidity of the intermediate cylindrical portion.

[0039] As shown in Figure 5, it is preferable that the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 is located more inwardly than the outer diameter side end of the inner cylindrical magnet 12 of the inner cylindrical portion 10. With this configuration, the gap between the inner cylindrical magnet 12 of the inner cylindrical portion 10 and the magnetic pole piece 22 of the intermediate cylindrical portion 20 is reduced, increasing the rigidity of the reinforcing ring 24 and preventing a decrease in rotation conversion efficiency. In the rotating device of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24, but it is sufficient to provide one or more.

[0040] Embodiment 3 FIG. 7 is a cross-sectional view of a rotating device according to a third embodiment. FIG. 7 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device. The rotating device 1 of this embodiment will be described as a magnetic gear device. Therefore, the basic configuration of the rotating device of this embodiment is similar to the configuration of the rotating device of the first embodiment.

[0041] As shown in FIG. 7 , in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is divided into four parts in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is disposed at a distance from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned more inward than the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0042] Furthermore, in a rotating device configured in this manner, the radial width of the reinforcing ring 24 can be further increased, thereby further increasing the rigidity of the reinforcing ring 24 itself, and as a result, the rigidity of the intermediate cylindrical portion 20 can be further improved.

[0043] In the rotating device of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24, but it is sufficient if it is provided with one or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic-geared rotating electric machine.

[0044] Embodiment 4 8 is a cross-sectional view of a rotation device according to embodiment 4. Fig. 8 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

[0045] As shown in FIG. 8 , in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is divided into four pieces in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is disposed at a distance from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned more inward than the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0046] In the rotating device 1 of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24. The radial width of the reinforcing ring 24 located at the center in the axial direction is smaller than the radial width of the reinforcing ring 24 located at the end in the axial direction. Therefore, the axial mass distribution of the intermediate cylindrical portion 20 is greater at the end than at the center.

[0047] The intermediate cylindrical portion 20 is fixed at both axial ends by end plates 25. Therefore, deformation of the intermediate cylindrical portion 20 due to gravity is greater in the central portion in the axial direction. In the rotation device of this embodiment, the axial mass distribution of the intermediate cylindrical portion 20 is smaller at the central portion than at the end portions, so deformation of the central portion of the intermediate cylindrical portion 20 due to gravity can be reduced.

[0048] In the rotating device of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24, but may be provided with four or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, similar effects can be obtained with a magnetic-geared rotating electric machine.

[0049] Embodiment 5. 9 is a cross-sectional view of a rotation device according to embodiment 5. Fig. 9 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

[0050] As shown in FIG. 9 , in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is divided into four pieces in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is disposed at a distance from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned more inward than the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0051] In the rotating device 1 of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24. If the axial distance between the reinforcing rings 24 located at the axial end side and the end plate 25 is L1, and the axial distance between the reinforcing rings 24 located at the axial center side is L2, L1 is smaller than L2. Furthermore, the radial width of the three reinforcing rings 24 is the same. Therefore, the axial mass distribution of the intermediate cylindrical portion 20 is greater at the end side than at the center side.

[0052] Both axial ends of the annular portion 23 of the intermediate cylindrical portion 20 are fixed by end plates 25. Therefore, deformation of the intermediate cylindrical portion 20 due to gravity is greater in the axial center portion. In the rotation device of this embodiment, the axial mass distribution of the intermediate cylindrical portion 20 is smaller at the center than at the end portions, so deformation of the center portion of the intermediate cylindrical portion 20 due to gravity can be reduced.

[0053] Furthermore, by making L1 smaller than L2, it is possible to reduce the load acting on the joint between the end plate 25 and the annular portion 23 due to the mass of the annular portion 23. As a result, it is possible to improve the strength reliability of the intermediate cylindrical portion 20.

[0054] In the rotating device of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24, but it is sufficient if two or more are provided. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic-geared rotating electric machine.

[0055] Embodiment 6 Fig. 10 is a cross-sectional view of a rotation device according to embodiment 6. Fig. 10 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

[0056] As shown in FIG. 10 , in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is divided into four pieces in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is disposed at a distance from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned more inward than the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, thereby improving the rigidity of the intermediate cylindrical portion.

[0057] In the rotating device 1 of this embodiment, the axial width of the cutout portion 11a is set large enough so that the reinforcing ring 24 does not come into contact with the inner cylindrical core 11. However, if the axial width of the inner cylindrical magnet 12 is reduced to match the width of the cutout portion 11a, the torque transmission efficiency of the magnetic gear device will decrease.

[0058] In the rotating device 1 of this embodiment, the width of the axial gap between the inner cylindrical magnets 12 is set smaller than the width of the cutout portion 11a. The axial thickness of the reinforcing ring 24 is set to be smallest at the position axially facing the inner cylindrical magnet 12.

[0059] In a rotating device configured in this manner, the axial gap between the reinforcing ring 24 and the inner cylindrical core 11 and the inner cylindrical magnet 12 can be increased, thereby preventing contact between the reinforcing ring 24 and the inner cylindrical portion 10. Furthermore, since there is no need to reduce the axial width of the inner cylindrical magnet 12, a decrease in the torque transmission efficiency of the magnetic gear device can be prevented.

[0060] In the rotating device of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24, but it is sufficient if it is provided with one or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic-geared rotating electric machine.

[0061] In addition, in the rotation devices of Embodiments 3 to 6, a notch is provided in the inner cylindrical core so that the inner diameter side end of the reinforcing ring is located more inwardly than the outer diameter side end of the inner cylindrical core. As an alternative configuration, instead of providing a notch in the inner cylindrical core, the inner cylindrical core may be configured as a split core divided into multiple pieces in the axial direction.

[0062] Embodiment 7 FIG. 11 is a perspective view of an intermediate cylindrical portion of a rotating device according to a seventh embodiment. The basic configuration of the rotating device of this embodiment is similar to that of the rotating devices of the first to sixth embodiments. Note that the end plates and bearings of the intermediate cylindrical portion 20 are omitted from FIG. 11. The intermediate cylindrical portion 20 in this embodiment has an annular portion 23 formed by spacers 21 and pole pieces 22 arranged alternately in the circumferential direction, and a reinforcing ring 24 that supports the annular portion 23 from its inner peripheral surface.

[0063] As shown in FIG. 11 , in the intermediate cylindrical portion 20 of this embodiment, the pole piece 22 is composed of a non-magnetic block 22a and a split pole piece 22b. The non-magnetic block 22a is positioned so that the reinforcing ring 24 and the pole piece 22 face each other. That is, the pole piece 22 is composed of the non-magnetic block 22a and the split pole piece 22b that is axially separated by the non-magnetic block 22a. The non-magnetic block 22a is made of a material with a lower density than the split pole piece 22b. The non-magnetic block 22a is made of a non-magnetic material such as stainless steel or resin. The split pole piece 22b is made of, for example, laminated electromagnetic steel plates.

[0064] The non-magnetic block 22a and the reinforcing ring 24 may be fastened together by bolts, welding, or the like. Alternatively, the non-magnetic block 22a and the reinforcing ring 24 may be formed as a single unit. Note that since the reinforcing ring 24 is fastened to the spacer 21, the non-magnetic block 22a may not be fastened to the reinforcing ring 24, but may be held in place by fitting with at least one of the spacer 21 and the split pole piece 22b.

[0065] In the rotating device configured as described above, the non-magnetic block 22a is made of a material with a lower density than the split pole pieces 22b, making it possible to reduce the weight of the intermediate cylindrical portion compared to the rotating devices of the first to sixth embodiments. As a result, the centrifugal force, gravity, and the like acting on the intermediate cylindrical portion can be reduced. In the rotating device of this embodiment, a portion of the pole pieces 22 is made of a non-magnetic material, so the proportion of magnetic material in the pole pieces 22 is reduced. However, the non-magnetic material is located opposite the reinforcing ring, and the magnetic material is located opposite the inner cylindrical magnet. In other words, a magnetic material is always present in the intermediate cylindrical portion at the position opposite the inner cylindrical magnet. Therefore, the torque transmission efficiency is not reduced in the rotating device of this embodiment.

[0066] Although the present application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are conceivable within the scope of the technology disclosed in this application, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with a component of another embodiment. [Explanation of symbols]

[0067] 1 Rotating device, 10 Inner cylindrical portion, 11 Inner cylindrical core, 11a Notch portion, 12 Inner cylindrical magnet, 20 Intermediate cylindrical portion, 21 Spacer, 22 Pole piece, 22a Non-magnetic block, 22b Split pole piece, 23 Annular portion, 24 Reinforcing ring, 25 End plate, 26 Bearing, 30 Outer cylindrical portion, 31 Outer cylindrical core, 31a Teeth, 32 Outer cylindrical magnet, 33 Outer cylindrical coil, 40 Rotating shaft.

Claims

1. A rotating device in which an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion are concentrically arranged around a rotation axis, the intermediate cylindrical portion includes an annular portion in which magnetic pole pieces and spacers formed as continuums along the rotation axis are alternately arranged in the circumferential direction, and a reinforcing ring that supports the annular portion, the reinforcing ring being arranged on the inner diameter side of the annular portion, and an outer circumferential surface of the reinforcing ring being fastened to an inner circumferential surface of the spacer, the inner cylindrical portion has a cylindrical inner cylindrical core and a plurality of inner cylindrical magnets arranged in a circumferential direction on an outer peripheral surface of the inner cylindrical core, The plurality of inner cylindrical magnets are divided into a plurality of parts in the axial direction, A rotating device, characterized in that an inner diameter side end of the reinforcing ring is located on the inner diameter side of an outer diameter side end of the inner cylindrical core.

2. A rotating device in which an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion are concentrically arranged around a rotation axis, the intermediate cylindrical portion includes an annular portion in which magnetic pole pieces and spacers formed as continuums along the rotation axis are alternately arranged in the circumferential direction, and a reinforcing ring that supports the annular portion, the reinforcing ring being arranged on the inner diameter side of the annular portion, and an outer circumferential surface of the reinforcing ring being fastened to an inner circumferential surface of the spacer, the inner cylindrical portion has a cylindrical inner cylindrical core and a plurality of inner cylindrical magnets arranged in a circumferential direction on an outer peripheral surface of the inner cylindrical core, The plurality of inner cylindrical magnets are divided into a plurality of parts in the axial direction, an inner diameter side end of the reinforcing ring is located on the inner diameter side of an outer diameter side end of the inner cylindrical magnet, A rotating device, characterized in that the axial thickness of the reinforcing ring is smallest at a position axially facing the inner cylindrical magnet.

3. A rotating device in which an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion are concentrically arranged around a rotation axis, the intermediate cylindrical portion includes an annular portion in which magnetic pole pieces and spacers formed as continuums along the rotation axis are alternately arranged in the circumferential direction, and a reinforcing ring that supports the annular portion, the reinforcing ring being arranged on the inner diameter side of the annular portion, and an outer circumferential surface of the reinforcing ring being fastened to an inner circumferential surface of the spacer, A rotating device characterized in that the intermediate cylindrical portion has three or more reinforcing rings, and the radial width of the reinforcing ring located at the center in the axial direction is smaller than the radial width of the reinforcing ring located at the end in the axial direction.

4. A rotating device in which an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion are concentrically arranged around a rotation axis, the intermediate cylindrical portion includes an annular portion in which magnetic pole pieces and spacers formed as continuums along the rotation axis are alternately arranged in the circumferential direction, and a reinforcing ring that supports the annular portion, the reinforcing ring being arranged on the inner diameter side of the annular portion, and an outer circumferential surface of the reinforcing ring being fastened to an inner circumferential surface of the spacer, A rotating device characterized in that the magnetic pole piece of the intermediate cylindrical portion is composed of a non-magnetic block arranged in a position facing the outer peripheral surface of the reinforcing ring, and a plurality of split magnetic pole pieces separated in the axial direction by the non-magnetic block.

5. A rotating device as described in claim 1 or 2, characterized in that the intermediate cylindrical portion has two or more reinforcing rings, end plates are arranged at both axial ends of the intermediate cylindrical portion, and the axial distance between the end plates and the reinforcing ring closest to the end plates is smaller than the axial distance between two of the reinforcing rings located toward the center in the axial direction.

6. 5. The rotating device according to claim 1, wherein the outer cylindrical portion has a magnet and an outer cylindrical core made of a magnetic material.

7. 5. A rotating device according to claim 1, wherein the intermediate cylindrical portion is a stator, and the outer cylindrical portion and the inner cylindrical portion are rotors that rotate relatively to each other, and the rotating device operates as a magnetic gear device.

8. 5. A rotating device according to claim 1, wherein the outer cylindrical portion includes a coil, the outer cylindrical portion is a stator, the intermediate cylindrical portion is a low-speed rotor, and the inner cylindrical portion is a high-speed rotor, and the rotating device operates as a magnetic-geared rotating electric machine.

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