Magnetic levitation motor

Abstract

To simplify a configuration.SOLUTION: In a magnetic levitation motor 10, an attraction force to one side stator 30 acts on a rotor 20, and also, an attraction force to the other side stator 40 acts on the rotor 20, and thus, the rotor 20 is floated between the one side stator 30 and the other side stator 40. Then, current supply to each winding wire 48 of the other side stator 40 is controlled and a magnetic pole on one side surface of each salient pole 46 of the other side stator 40 is controlled, whereby the rotor 20 is rotated. Here, the one side stator 30 is provided with a permanent magnet but is not provided with a winding wire. Accordingly, the configuration thereof is simplified.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a magnetic levitation motor in which a rotor is disposed between a one-side stator and an other-side stator.

Background Art

[0002] In the axial magnetic levitation motor described in Patent Document 1 below, one-side stator is disposed on one axial side of the rotor, and the other-side stator is disposed on the other axial side of the rotor.

[0003] Here, in this axial magnetic levitation motor, permanent magnets are provided on one axial side surface and the other axial side surface of the rotor, and windings are provided on the one-side stator and the other-side stator, respectively. Then, the magnetic fluxes generated by the windings of the one-side stator and the magnetic fluxes generated by the windings of the other-side stator are controlled, so that the rotor is rotated in the circumferential direction and a displacement force in the radial direction is applied to the rotor.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In consideration of the above facts, an object of the present invention is to obtain a magnetic levitation motor with a simple configuration.

Means for Solving the Problems

[0006] A magnetic levitation motor according to a first aspect of the present invention comprises: a rotor that is rotatable in the circumferential direction; a one-side stator disposed on one axial side of the rotor; a other-side stator disposed on the other axial side of the rotor and provided with windings; a rotating permanent magnet provided on the other axial side of the rotor, which is attracted to the other-side stator and causes the rotor to be attracted to the other axial side, and the magnetic flux generated by the windings is controlled to rotate the rotor; and an attractive permanent magnet provided on at least one of the axial side of the rotor and the one-side stator, which forms an attractive magnetic path between the rotor and the one-side stator so that the rotor is attracted to one axial side, and the attractive magnetic path is inclined with respect to the axial direction of the rotor when the rotor is displaced radially.

[0007] A magnetic levitation motor according to a second aspect of the present invention is a magnetic levitation motor according to a first aspect of the present invention, comprising: a rotating opposing portion provided on the rotor; and a fixed opposing portion provided on the one-side stator, which is opposed to the rotating opposing portion and forms the magnetic attraction path between the rotating opposing portion and the fixed opposing portion, and which releases at least a portion of the opposition with the rotating opposing portion when the rotor is displaced radially.

[0008] A third aspect of the present invention is a magnetic levitation motor in which, in the magnetic levitation motor of the second aspect of the present invention, the surface of the fixed opposing part facing the rotating opposing part is arranged along the surface of the rotating opposing part facing the fixed opposing part.

[0009] A fourth aspect of the present invention is a magnetic levitation motor in which the magnetic attraction path is formed over the entire circumferential direction of the rotor, in any one of the first to third aspects of the present invention.

[0010] A fifth aspect of the present invention is a magnetic levitation motor in which, in any one of the first to fourth aspects of the present invention, a plurality of magnetic attraction paths are formed in the radial direction of the rotor. [Effects of the Invention]

[0011] In the magnetic levitation motor according to the first aspect of the present invention, a stator is arranged on one axial side of the rotor, and a stator is arranged on the other axial side of the rotor. At least one of the axial side of the rotor and the stator is provided with an attractive permanent magnet, and an attractive magnetic path is formed between the rotor and the stator, causing the rotor to be attracted to the axial side. Furthermore, a rotating permanent magnet is provided on the other axial side of the rotor, and the rotating permanent magnet is attracted to the stator, causing the rotor to be attracted to the other axial side. A winding is provided on the stator, and the magnetic flux generated by the winding is controlled to rotate the rotor.

[0012] In this configuration, no windings are provided on one side of the stator. This allows for a simpler design.

[0013] Furthermore, when the rotor is displaced radially, the magnetic attraction path between the rotor and one stator is tilted with respect to the axial direction of the rotor. This allows a restoring force to be applied to the rotor in the radial direction.

[0014] In the magnetic levitation motor of the second aspect of the present invention, the rotating opposing portion of the rotor and the fixed opposing portion of one side stator are opposed to each other, and an attractive magnetic path is formed between the rotating opposing portion and the fixed opposing portion. When the rotor is displaced radially, at least a portion of the opposition between the rotating opposing portion and the fixed opposing portion is released. Therefore, the attractive magnetic path can be inclined with respect to the axial direction of the rotor.

[0015] In the magnetic levitation motor of the third aspect of the present invention, the surface of the fixed opposing part facing the rotating opposing part is arranged along the surface of the rotating opposing part facing the fixed opposing part. This makes it possible to increase the attractive force of the rotating opposing part toward the fixed opposing part.

[0016] In the magnetic levitation motor according to the fourth aspect of the present invention, an attractive magnetic path is formed along the entire circumferential direction of the rotor. This allows for a large attractive force to one side of the rotor towards the stator.

[0017] In the magnetic levitation motor according to the fifth aspect of the present invention, a plurality of attracting magnetic paths are formed in the radial direction of the rotor. Therefore, the attracting force of the rotor to one side stator can be increased.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view showing a magnetic levitation motor according to the first embodiment of the present invention. [Figure 2] (A) to (D) are plan views showing the stator core of the other side stator and the rotor magnet of the rotor in the magnetic levitation motor according to the first embodiment of the present invention. (A) shows when the rotor is rotated, (B) shows when a displacement force to the other side acts on the rotor, (C) shows when a tilting force around the X-axis direction acts on the rotor, and (D) shows when a tilting force around the Y-axis direction acts on the rotor. [Figure 3] It is a perspective view showing the one side stator and the rotor in the magnetic levitation motor according to the first embodiment of the present invention. [Figure 4] (A) and (B) are cross-sectional views showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the first embodiment of the present invention. (A) shows the normal state, and (B) shows the state when the rotor is displaced in the radial direction. [Figure 5] It is a cross-sectional view showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the modified example (first modified example) of the first embodiment of the present invention. [Figure 6] It is a cross-sectional view showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the second embodiment of the present invention. [Figure 7] It is a cross-sectional view showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the modified example (second modified example) of the second embodiment of the present invention. [Figure 8] It is a cross-sectional view showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the third embodiment of the present invention. [Figure 9] It is a cross-sectional view showing the rotating bodies of the one side stator and the rotor in the magnetic levitation motor according to the fourth embodiment of the present invention. [Figure 10] The figure is a cross-sectional view showing a rotating body of a one-side stator and a rotor in a magnetic levitation motor according to a modification (third modification) of the fourth embodiment of the present invention.

Embodiments for Carrying out the Invention

[0019] [First Embodiment] In FIG. 1, a magnetic levitation motor 10 according to the first embodiment of the present invention is shown in a perspective view. In this embodiment, the positions in the magnetic levitation motor 10 are shown in a coordinate system of the X-axis, Y-axis, and Z-axis. In the drawing, the positive direction of the X-axis of the magnetic levitation motor 10 is indicated by an arrow X, the positive direction of the Y-axis of the magnetic levitation motor 10 is indicated by an arrow Y, and the positive direction of the Z-axis of the magnetic levitation motor 10 is indicated by an arrow Z.

[0020] An outer periphery of the magnetic levitation motor 10 according to the present embodiment is provided with a container-shaped housing (not shown).

[0021] As shown in FIG. 1, a substantially disk-shaped rotor 20 is provided in the housing. The rotor 20 is rotatable in the circumferential direction, displaceable in the axial direction (Z-axis direction) and the radial direction (X-axis direction, Y-axis direction, etc.), and tiltable around the radial direction.

[0022] On one side (one axial side, Z-axis positive direction side) of the rotor 20, a one-side stator 30 is provided, and on the other side (the other axial side, Z-axis negative direction side) of the rotor 20, the other-side stator 40 is provided. The one-side stator 30 and the other-side stator 40 are fixed in the housing, and their respective central axes are arranged along the Z-axis.

[0023] On the other side stator 40, a stator core 42, which is a magnetic material serving as the stator body, is provided coaxially, and a roughly disc-shaped stator plate 44 is provided coaxially at the other end of the stator core 42. Multiple salient poles 46, which serve as magnetic poles, are integrally provided on the stator plate 44. Each of the multiple salient poles 46 protrudes to one side and is arranged at equal intervals in the circumferential direction of the stator plate 44. In this embodiment, eight salient poles 46A to 46H are provided, and the salient poles 46A to 46H are roughly trapezoidal columnar shapes and are arranged in this order in the circumferential direction of the stator plate 44. A winding 48 (coil) is wound around the salient pole 46, and current is supplied to the winding 48 to make one side of the salient pole 46 a magnetic pole (N pole or S pole).

[0024] On the other side of the rotor 20, multiple rotor magnets 22 (see Figure 2(A)), which are permanent magnets acting as rotating permanent magnets, are integrally provided, and the multiple rotor magnets 22 are arranged at equal intervals in the circumferential direction of the rotor 20. In this embodiment, two rotor magnets 22A to 22B are provided, and the rotor magnets 22A to 22B are in the shape of crescent-shaped plates and are arranged in a half-circumferential range of the rotor 20, and the other sides of rotor magnets 22A and rotor magnets 22B are the south pole and north pole, respectively. The rotor magnets 22 are subjected to an attractive force (magnetic force) to the salient poles 46 of the other side stator 40, thereby acting an attractive force on the rotor 20 toward the other side.

[0025] One stator 30 (see Figures 3 and 4(A)) is made of a magnetic material, and a substantially disc-shaped fixing plate 30A is provided coaxially at one end of the one stator 30. A cylindrical outer fixing part 30B is integrally and coaxially provided at the outer peripheral end of the fixing plate 30A as a fixing opposing part, and the outer fixing part 30B protrudes to the other side, and its other side is a plane perpendicular to the Z axis. A cylindrical inner fixing part 30C is integrally and coaxially provided on the inner peripheral side of the fixing plate 30A as a fixing opposing part, and the inner fixing part 30C protrudes to the other side, and its other side is a plane perpendicular to the Z axis. The radial dimension of the peripheral wall of the inner fixing part 30C is larger than the radial dimension of the peripheral wall of the outer fixing part 30B, and the area of ​​the other side of the inner fixing part 30C is the same as the area of ​​the other side of the outer fixing part 30B. The internal fixing portion 30C is a permanent magnet that acts as an attractive permanent magnet, and the internal fixing portion 30C forms a magnetic path 12 that passes through the axial direction of the internal fixing portion 30C, the radial direction of the fixing plate 30A, and the axial direction of the external fixing portion 30B.

[0026] A rotating body 24 (see Figures 3 and 4(A)), which is made of magnetic material, is provided coaxially on the rotor 20. A substantially disc-shaped rotating plate 24A is provided coaxially on the other side of the rotating body 24. A cylindrical outer rotating part 24B, which serves as a rotational opposing part, is integrally and coaxially provided on the outer peripheral end of the rotating plate 24A. The outer rotating part 24B protrudes to one side, and one side surface is a flat surface perpendicular to the axial direction of the rotor 20. A cylindrical inner rotating part 24C, which serves as a rotational opposing part, is provided integrally and coaxially on the inner peripheral side of the rotating plate 24A. The inner rotating part 24C protrudes to one side, and one side surface is a flat surface perpendicular to the axial direction of the rotor 20.

[0027] The outer diameter and inner diameter of the outer rotating portion 24B are the same as the outer diameter and inner diameter of the outer fixed portion 30B of the one-side stator 30, respectively, and the outer diameter and inner diameter of the inner rotating portion 24C are the same as the outer diameter and inner diameter of the inner fixed portion 30C of the one-side stator 30, respectively. One side of the outer rotating portion 24B and one side of the inner rotating portion 24C are opposite in the Z-axis direction to the other side of the outer fixed portion 30B and the other side of the inner fixed portion 30C, respectively, and the magnetic path 12 formed by the inner fixed portion 30C passes between one side of the inner rotating portion 24C and the other side of the inner fixed portion 30C, in the radial direction of the rotating plate 24A, and between one side of the outer rotating portion 24B and the other side of the outer fixed portion 30B. Furthermore, the magnetic path 12 passes between one side of the inner rotating part 24C and the other side of the inner fixed part 30C, causing an attractive force (magnetic force) to act on one side of the inner rotating part 24C toward the other side of the inner fixed part 30C. Similarly, the magnetic path 12 passes between one side of the outer rotating part 24B and the other side of the outer fixed part 30B, causing an attractive force (magnetic force) to act on one side of the outer rotating part 24B toward the other side of the outer fixed part 30B. As a result, attractive forces are applied to the rotor 20 toward one side and toward the Z-axis side (the side coaxial with the Z-axis). The magnetic path 12 between the one-side stator 30 and the rotating body 24 will be referred to below as the "attractive magnetic path 12A".

[0028] A sensor 14 is provided around the rotor 20 as a detection unit, and the sensor 14 detects the rotation of the rotor 20, displacement in the axial and radial directions, and tilting around the radial direction. The sensor 14 is connected to a control device 16, and each winding 48 of the other stator 40 is connected to the control device 16. Based on the detection results of the sensor 14, the control device 16 controls the supply of current to each winding 48 to control the magnetic pole on one side of each salient pole 46 of the other stator 40.

[0029] Next, the operation of this embodiment will be explained.

[0030] In the magnetic levitation motor 10 with the above configuration, an attractive force acts on the rotor magnet 22 of the rotor 20 toward the salient pole 46 of the other stator 40, thereby acting an attractive force on the rotor 20 toward the other side. In addition, attractive forces act on the outer rotating part 24B and the inner rotating part 24C of the rotor 20 (rotating body 24) toward the outer fixed part 30B and the inner fixed part 30C of the one stator 30, respectively, thereby acting an attractive force on the rotor 20 toward one side. As a result, the rotor 20 is levitated between the other stator 40 and the one stator 30.

[0031] Furthermore, attractive forces are applied to the outer rotating portion 24B and inner rotating portion 24C of the rotor 20 (rotating body 24) toward the outer fixed portion 30B and inner fixed portion 30C of the stator 30, respectively, thereby applying an attractive force to the rotor 20 toward the Z-axis. As a result, the entire surface of one side of the outer rotating portion 24B is opposed to the entire other surface of the outer fixed portion 30B in the Z-axis direction, and the entire surface of one side of the inner rotating portion 24C is opposed to the entire other surface of the inner fixed portion 30C in the Z-axis direction, so that the central axis of the rotor 20 is aligned along the Z-axis.

[0032] When the rotor 20 rotates, the control device 16 controls the supply of current to each winding 48 of the other stator 40 based on the rotational position of the rotor 20 detected by the sensor 14, thereby controlling the magnetic poles on one side of each salient pole 46 of the other stator 40, and thus a rotational force is applied to the rotor 20.

[0033] For example, as shown in Figure 2(A), when rotor magnets 22A (with the other side being the south pole) are arranged in a counterclockwise range from salient pole 46A to salient pole 46E, and rotor magnets 22B (with the other side being the north pole) are arranged in a counterclockwise range from salient pole 46E to salient pole 46A, one side of salient poles 46A, 46B, and 46H is controlled to be the south pole, and one side of salient poles 46D, 46E, and 46F is controlled to be the north pole, thereby generating a counterclockwise rotational force τ on the rotor 20. θz This is applied.

[0034] When the rotor 20 is displaced in the axial direction, the control device 16 controls the supply of current to each winding 48 of the other stator 40 based on the axial position of the rotor 20 detected by the sensor 14, thereby controlling the magnetic pole on one side of each salient pole 46 of the other stator 40. This causes an axial restoring force to act on the rotor 20, eliminating the axial displacement of the rotor 20.

[0035] For example, as shown in Figure 2(B), when the rotor 20 is displaced to one side, if the rotor magnet 22A (with the other side being the south pole) is positioned in a counterclockwise range from salient pole 46A to salient pole 46E, and the rotor magnet 22B (with the other side being the north pole) is positioned in a counterclockwise range from salient pole 46E to salient pole 46A, then one side of salient poles 46B, 46C, and 46D is controlled to be the north pole, and one side of salient poles 46F, 46G, and 46H is controlled to be the south pole. This causes a restoring force Fz to act on the rotor 20 towards the other side, thereby eliminating the displacement of the rotor 20 to one side.

[0036] When the rotor 20 is tilted radially, the control device 16 controls the supply of current to each winding 48 of the other stator 40 based on the radial tilt position of the rotor 20 detected by the sensor 14, thereby controlling the magnetic poles on one side of each salient pole 46 of the other stator 40. This applies a restoring force to the rotor 20 radially, eliminating the radial tilt of the rotor 20.

[0037] For example, as shown in Figure 2(C), when the rotor 20 is tilted around the X-axis, if the rotor magnet 22A (with the other side being the south pole) is positioned in the counterclockwise range from salient pole 46A to salient pole 46E, and the rotor magnet 22B (with the other side being the north pole) is positioned in the counterclockwise range from salient pole 46E to salient pole 46A, then one side of salient poles 46B and 46F is controlled to be the south pole, and one side of salient poles 46D and 46H is controlled to be the north pole, thereby creating a restoring force τ around the X-axis of the rotor 20. θx This action is applied, and the tilting of the rotor 20 around the X-axis is eliminated.

[0038] For example, as shown in Figure 2(D), when the rotor 20 is tilted around the Y-axis, if the rotor magnet 22A (with the other side being the south pole) is positioned in a counterclockwise range from salient pole 46A to salient pole 46E, and the rotor magnet 22B (with the other side being the north pole) is positioned in a counterclockwise range from salient pole 46E to salient pole 46A, then one side of salient poles 46A and 46E is controlled to be the north pole, and one side of salient poles 46C and 46G is controlled to be the south pole, thereby creating a restoring force τ around the Y-axis of the rotor 20. θy This action is applied, and the tilting of the rotor 20 around the Y-axis is eliminated.

[0039] In this embodiment of the magnetic levitation motor 10, only a permanent magnet (internal fixing portion 30C) is provided on one side stator 30, and no windings are provided. Therefore, the configuration of the one side stator 30 can be simplified, and the need to provide a device to control the current supplied to the windings of the one side stator 30 can be eliminated, thus simplifying the configuration of the magnetic levitation motor 10 and allowing the magnetic levitation motor 10 to be miniaturized.

[0040] Furthermore, as shown in Figure 4(B), when the rotor 20 is displaced radially, a portion of the opposition between the outer rotating portion 24B of the rotor 20 and the outer fixed portion 30B of the one-side stator 30, and a portion of the opposition between the inner rotating portion 24C of the rotor 20 and the inner fixed portion 30C of the one-side stator 30 are released, causing the magnetic attraction paths 12A between the outer rotating portion 24B and the outer fixed portion 30B, and between the inner rotating portion 24C and the inner fixed portion 30C, to be tilted with respect to the Z-axis direction (the axis direction of the rotor 20). As a result, a restoring force F in the radial direction can be applied to the rotor 20, eliminating the radial displacement of the rotor 20 and stabilizing the radial position of the rotor 20. This allows for appropriate suppression of radial displacement of the rotor 20, even at high rotational speeds.

[0041] Furthermore, one side of the outer rotating portion 24B of the rotor 20 and the other side of the outer fixed portion 30B of the one-side stator 30 are planes perpendicular to the Z-axis, and the other side of the outer fixed portion 30B is positioned along the one side of the outer rotating portion 24B. Moreover, one side of the inner rotating portion 24C of the rotor 20 and the other side of the inner fixed portion 30C of the one-side stator 30 are planes perpendicular to the Z-axis, and the other side of the inner fixed portion 30C is positioned along the one side of the inner rotating portion 24C. As a result, the attractive force between the outer rotating portion 24B and the outer fixed portion 30B and the attractive force between the inner rotating portion 24C and the inner fixed portion 30C can be increased. Consequently, when the rotor 20 is displaced radially, the radial restoring force F acting on the rotor 20 can be increased, and the radial displacement of the rotor 20 can be effectively eliminated.

[0042] Furthermore, the outer rotating portion 24B and inner rotating portion 24C of the rotor 20 and the outer fixed portion 30B and inner fixed portion 30C of the one-sided stator 30 are provided along the entire circumference of the rotor 20, and the attractive magnetic path 12A between the rotor 20 and the one-sided stator 30 is formed along the entire circumference of the rotor 20. As a result, the attractive force between the rotor 20 and the one-sided stator 30 can be increased. When the rotor 20 is displaced radially, the radial restoring force F acting on the rotor 20 can be increased, and the radial displacement of the rotor 20 can be effectively eliminated.

[0043] Furthermore, the rotor 20 is provided with an outer rotating section 24B and an inner rotating section 24C, and the one-sided stator 30 is provided with an outer fixing section 30B and an inner fixing section 30C, so that two magnetic attraction paths 12A are formed in the radial direction of the rotor 20. As a result, the attractive force between the rotor 20 and the one-sided stator 30 can be increased. And when the rotor 20 is displaced radially, the radial restoring force F acting on the rotor 20 can be increased, and the radial displacement of the rotor 20 can be effectively eliminated.

[0044] Furthermore, in the magnetic levitation motor 10, an impeller (not shown) is provided on the rotor 20 (for example, between the rotating body 24 and the rotor magnet 22), allowing the impeller to rotate integrally with the rotor 20 to pump fluid. As a result, the magnetic levitation motor 10 can be used as a pump and applied to artificial hearts and the like. This simplifies the configuration of the pump in an artificial heart or the like, and allows for miniaturization of the pump.

[0045] (First variation) Figure 5 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 50 according to a modified example of the first embodiment of the present invention.

[0046] As shown in Figure 5, in the magnetic levitation motor 50 according to this modified example, the outer fixing portion 30B of the stator 30 is a permanent magnet acting as an attractive permanent magnet, and the outer fixing portion 30B and the inner fixing portion 30C form a magnetic path 12 that passes through the axial direction of the inner fixing portion 30C, the radial direction of the fixing plate 30A, and the axial direction of the outer fixing portion 30B.

[0047] In the rotating body 24 of the rotor 20, the outer rotating portion 24B and the inner rotating portion 24C are made of permanent magnets that act as attractive permanent magnets, and the outer rotating portion 24B and the inner rotating portion 24C form a magnetic path 12 that passes through the axial direction of the inner rotating portion 24C, the radial direction of the rotating plate 24A, and the axial direction of the outer rotating portion 24B.

[0048] The magnetic path 12 formed by the outer fixing portion 30B and the inner fixing portion 30C and the magnetic path 12 formed by the outer rotating portion 24B and the inner rotating portion 24C are continuous between one side of the inner rotating portion 24C and the other side of the inner fixing portion 30C, and between one side of the outer rotating portion 24B and the other side of the outer fixing portion 30B. An attractive force acts on one side of the inner rotating portion 24C toward the other side of the inner fixing portion 30C, and an attractive force acts on one side of the outer rotating portion 24B toward the other side of the outer fixing portion 30B.

[0049] In this modified example, the same actions and effects as those of the first embodiment can be achieved.

[0050] Furthermore, not only the inner fixing portion 30C of the stator 30, but also the outer fixing portion 30B of the stator 30, the outer rotating portion 24B and the inner rotating portion 24C of the rotor 20 are made of permanent magnets. As a result, the attractive force between the rotor 20 and the stator 30 can be effectively increased. This also effectively increases the radial restoring force F acting on the rotor 20 when the rotor 20 is displaced radially, and effectively eliminates the radial displacement of the rotor 20.

[0051] [Second Embodiment] Figure 6 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 60 according to a second embodiment of the present invention.

[0052] The magnetic levitation motor 60 according to this embodiment has substantially the same configuration as that of the first embodiment described above, but differs in the following respects.

[0053] As shown in Figure 6, in the magnetic levitation motor 60 according to this embodiment, the inner fixing portion 30C of the stator 30 on one side is cylindrical, and the area of ​​the other side of the inner fixing portion 30C is larger than the area of ​​the other side of the outer fixing portion 30B.

[0054] In the rotating body 24 of the rotor 20, the inner rotating portion 24C is cylindrical, and the diameter of the inner rotating portion 24C is the same as the diameter of the inner fixed portion 30C of the stator 30 on one side.

[0055] In this embodiment, the same effects and advantages as those of the first embodiment can be achieved.

[0056] Furthermore, the inner fixing portion 30C of the one-sided stator 30 and the inner rotating portion 24C of the rotor 20 are cylindrical, increasing the area of ​​the other side of the inner fixing portion 30C and one side of the inner rotating portion 24C. This effectively increases the attractive force between the rotor 20 and the one-sided stator 30. As a result, when the rotor 20 is displaced radially, the radial restoring force F acting on the rotor 20 can be effectively increased, effectively eliminating the radial displacement of the rotor 20.

[0057] (Second variation) Figure 7 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 70 according to a modified example of the second embodiment of the present invention.

[0058] As shown in Figure 7, in the magnetic levitation motor 70 according to this modified example, the outer fixing portion 30B of the stator 30 is a permanent magnet acting as an attractive permanent magnet, and the outer fixing portion 30B and the inner fixing portion 30C form a magnetic path 12 that passes through the axial direction of the inner fixing portion 30C, the radial direction of the fixing plate 30A, and the axial direction of the outer fixing portion 30B.

[0059] In the rotating body 24 of the rotor 20, the outer rotating portion 24B and the inner rotating portion 24C are made of permanent magnets that act as attractive permanent magnets, and the outer rotating portion 24B and the inner rotating portion 24C form a magnetic path 12 that passes through the axial direction of the inner rotating portion 24C, the radial direction of the rotating plate 24A, and the axial direction of the outer rotating portion 24B.

[0060] The magnetic path 12 formed by the outer fixing portion 30B and the inner fixing portion 30C and the magnetic path 12 formed by the outer rotating portion 24B and the inner rotating portion 24C are continuous between one side of the inner rotating portion 24C and the other side of the inner fixing portion 30C, and between one side of the outer rotating portion 24B and the other side of the outer fixing portion 30B. An attractive force acts on one side of the inner rotating portion 24C toward the other side of the inner fixing portion 30C, and an attractive force acts on one side of the outer rotating portion 24B toward the other side of the outer fixing portion 30B.

[0061] In this modified example, the same actions and effects as those of the second embodiment described above can be achieved.

[0062] Furthermore, not only the inner fixing portion 30C of the stator 30, but also the outer fixing portion 30B of the stator 30, the outer rotating portion 24B and the inner rotating portion 24C of the rotor 20 are made of permanent magnets. As a result, the attractive force between the rotor 20 and the stator 30 can be effectively increased. This also effectively increases the radial restoring force F acting on the rotor 20 when the rotor 20 is displaced radially, and effectively eliminates the radial displacement of the rotor 20.

[0063] [Third Embodiment] Figure 8 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 80 according to a third embodiment of the present invention.

[0064] The magnetic levitation motor 80 according to this embodiment has substantially the same configuration as that of the second embodiment described above, but differs in the following respects.

[0065] As shown in Figure 8, in the magnetic levitation motor 80 according to this embodiment, the stator 30 on one side does not have a fixing plate 30A and an outer fixing portion 30B, and the inner fixing portion 30C forms a magnetic path 12 that passes through the axial direction of the inner fixing portion 30C.

[0066] In the rotor 20, the rotating body 24 does not have an outer rotating portion 24B, and the rotating plate 24A is made of a non-magnetic material. The magnetic path 12 formed by the inner fixed portion 30C of the one-sided stator 30 passes between the other side of the inner fixed portion 30C and one side of the inner rotating portion 24C, and also through the radial direction of the inner rotating portion 24C.

[0067] In this embodiment, the same effects and advantages as those of the second embodiment described above can be achieved.

[0068] Furthermore, the stator 30 on one side does not have a fixing plate 30A and an external fixing part 30B, and the rotating body 24 of the rotor 20 does not have an external rotating part 24B. As a result, the configuration of the magnetic levitation motor 80 can be made even simpler, and the magnetic levitation motor 80 can be made even smaller.

[0069] In this embodiment, the internal rotating portion 24C of the rotor 20 (rotating body 24) may be a permanent magnet acting as an attractive permanent magnet.

[0070] [Fourth Embodiment] Figure 9 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 90 according to the fourth embodiment of the present invention.

[0071] The magnetic levitation motor 90 according to this embodiment has substantially the same configuration as that of the first embodiment described above, but differs in the following respects.

[0072] As shown in Figure 9, in the magnetic levitation motor 90 according to this embodiment, a cylindrical middle fixing part 30D is integrally and coaxially provided on the fixing plate 30A of one side stator 30, between the outer fixing part 30B and the inner fixing part 30C, as a fixing opposing part. The middle fixing part 30D protrudes to the other side, and its other side is a flat surface perpendicular to the Z-axis. The outer fixing part 30B of one side stator 30 is a permanent magnet acting as an attractive permanent magnet, and the outer fixing part 30B forms a magnetic path 12 passing through the axial direction of the outer fixing part 30B, the radial direction of the fixing plate 30A, and the axial direction of the middle fixing part 30D. Furthermore, the inner fixing part 30C forms a magnetic path 12 passing through the axial direction of the inner fixing part 30C, the radial direction of the fixing plate 30A, and the axial direction of the middle fixing part 30D.

[0073] In the rotating body 24 of the rotor 20, a cylindrical intermediate rotating part 24D is integrally and coaxially provided on the rotating plate 24A between the outer rotating part 24B and the inner rotating part 24C, serving as a rotation-opposing part. The intermediate rotating part 24D protrudes to one side, and one side surface is a flat surface perpendicular to the axial direction of the rotor 20. The outer diameter and inner diameter of the intermediate rotating part 24D are the same as the outer diameter and inner diameter of the intermediate fixed part 30D of the one-side stator 30, respectively, and one side surface of the intermediate rotating part 24D faces the other side surface of the intermediate fixed part 30D of the one-side stator 30.

[0074] The magnetic path 12 formed by the outer fixing portion 30B of the one-side stator 30 passes between one side of the outer rotating portion 24B and the other side of the outer fixing portion 30B, in the radial direction of the rotating plate 24A, and between one side of the middle rotating portion 24D and the other side of the middle fixing portion 30D. The magnetic path 12 formed by the inner fixing portion 30C of the one-side stator 30 passes between one side of the inner rotating portion 24C and the other side of the inner fixing portion 30C, in the radial direction of the rotating plate 24A, and between one side of the middle rotating portion 24D and the other side of the middle fixing portion 30D. Furthermore, the magnetic path 12 passes between one side of the inner rotating part 24C and the other side of the inner fixed part 30C, so that an attractive force acts on one side of the inner rotating part 24C toward the other side of the inner fixed part 30C. The magnetic path 12 also passes between one side of the outer rotating part 24B and the other side of the outer fixed part 30B, so that an attractive force acts on one side of the outer rotating part 24B toward the other side of the outer fixed part 30B. In addition, the magnetic path 12 passes between one side of the middle rotating part 24D and the other side of the middle fixed part 30D, so that an attractive force acts on one side of the middle rotating part 24D toward the other side of the middle fixed part 30D. As a result, attractive forces are applied to the rotor 20 toward one side and toward the Z-axis.

[0075] In this embodiment, the same actions and effects as those of the first embodiment can be achieved.

[0076] Furthermore, not only the internal fixing portion 30C of the stator 30 but also the external fixing portion 30B of the stator 30 is made of permanent magnets. This effectively increases the attractive force between the rotor 20 and the stator 30. When the rotor 20 is displaced radially, the radial restoring force F acting on the rotor 20 can be effectively increased, and the radial displacement of the rotor 20 can be effectively eliminated.

[0077] Furthermore, the rotor 20 is provided not only with an outer rotating section 24B and an inner rotating section 24C, but also with a middle rotating section 24D, and the one-sided stator 30 is provided not only with an outer fixing section 30B and an inner fixing section 30C, but also with a middle fixing section 30D, so that three magnetic attraction paths 12A are formed in the radial direction of the rotor 20. As a result, the attractive force between the rotor 20 and the one-sided stator 30 can be effectively increased. And when the rotor 20 is displaced radially, the restoring force F acting on the rotor 20 in the radial direction can be effectively increased, and the radial displacement of the rotor 20 can be effectively eliminated.

[0078] (Third variation) Figure 10 shows a cross-sectional view of the rotating body 24 of the stator 30 and rotor 20 in a magnetic levitation motor 100 according to a modified example of the fourth embodiment of the present invention.

[0079] As shown in Figure 10, in the magnetic levitation motor 100 according to this modified example, in the stator 30 on one side, the central fixing portion 30D is a permanent magnet acting as an attractive permanent magnet. The outer fixing portion 30B and the central fixing portion 30D form a magnetic path 12 passing through the axial direction of the outer fixing portion 30B, the radial direction of the fixing plate 30A, and the axial direction of the central fixing portion 30D. The inner fixing portion 30C and the central fixing portion 30D also form a magnetic path 12 passing through the axial direction of the inner fixing portion 30C, the radial direction of the fixing plate 30A, and the axial direction of the central fixing portion 30D.

[0080] In the rotating body 24 of the rotor 20, the outer rotating part 24B, the inner rotating part 24C, and the middle fixed part 30D are made of permanent magnets that act as attractive permanent magnets. The outer rotating part 24B and the middle rotating part 24D form a magnetic path 12 passing through the axial direction of the outer rotating part 24B, the radial direction of the rotating plate 24A, and the axial direction of the middle rotating part 24D. The inner rotating part 24C and the middle rotating part 24D also form a magnetic path 12 passing through the axial direction of the inner rotating part 24C, the radial direction of the rotating plate 24A, and the axial direction of the middle rotating part 24D.

[0081] The magnetic path 12 formed by the outer fixed part 30B and the middle fixed part 30D and the magnetic path 12 formed by the outer rotating part 24B and the middle rotating part 24D are continuous between one side of the outer rotating part 24B and the other side of the outer fixed part 30B, and between one side of the middle rotating part 24D and the other side of the middle fixed part 30D. An attractive force acts on one side of the outer rotating part 24B toward the other side of the outer fixed part 30B, and an attractive force acts on one side of the middle rotating part 24D toward the other side of the middle fixed part 30D. The magnetic path 12 formed by the central fixed portion 30D and the inner fixed portion 30C and the magnetic path 12 formed by the central rotating portion 24D and the inner rotating portion 24C are continuous between one side of the inner rotating portion 24C and the other side of the inner fixed portion 30C, and between one side of the central rotating portion 24D and the other side of the central fixed portion 30D. An attractive force acts on one side of the inner rotating portion 24C toward the other side of the inner fixed portion 30C, and an attractive force acts on one side of the central rotating portion 24D toward the other side of the central fixed portion 30D.

[0082] In this modified example, the same actions and effects as those of the fourth embodiment described above can be achieved.

[0083] Furthermore, not only the outer fixing portion 30B and inner fixing portion 30C of the stator 30, but also the middle fixing portion 30D of the stator 30, the outer rotating portion 24B, the inner rotating portion 24C, and the middle rotating portion 24D of the rotor 20 are made of permanent magnets. As a result, the attractive force between the rotor 20 and the stator 30 can be effectively increased. This also effectively increases the radial restoring force F acting on the rotor 20 when the rotor 20 is displaced radially, and effectively eliminates the radial displacement of the rotor 20.

[0084] In addition, in the fourth embodiment described above (including the third modified example), the internal fixing portion 30C of the one-sided stator 30 and the internal rotating portion 24C of the rotor 20 may be cylindrical.

[0085] Furthermore, in the first embodiment (including the first modification), the second embodiment (including the second modification), the third embodiment, and the fourth embodiment (including the third modification), attractive permanent magnets are provided only on one side stator 30 or on one side stator 30 and rotor 20. However, attractive permanent magnets may be provided only on rotor 20.

[0086] Furthermore, in the first embodiment (including the first modification), the second embodiment (including the second modification), the third embodiment and the fourth embodiment (including the third modification), the other end of the fixed opposing portion (outer fixing portion 30B, inner fixing portion 30C and middle fixing portion 30D) of one side stator 30 may be sharpened to form a linear shape on the other end of the fixed opposing portion, and the one end of the rotating opposing portion (outer rotating portion 24B, inner rotating portion 24C and middle rotating portion 24D) of rotor 20 may be sharpened to form a linear shape on the one end of the rotating opposing portion. [Explanation of Symbols]

[0087] 10 Magnetic Levitation Motor 12A attraction magnetic path 20 rotors 22 Rotor magnets (rotating permanent magnets) 24B External rotating part (rotating opposing part, attractive permanent magnet) 24C Internal rotating part (rotating opposing part, attractive permanent magnet) 24D Medium Rotating Section (Rotating Opposing Section, Attracting Permanent Magnet) 30 Single-sided stator 30B External fixed part (fixed opposing part, attractive permanent magnet) 30C Internal fixed part (fixed opposing part, attractive permanent magnet) 30D Middle fixed part (fixed opposing part, attractive permanent magnet) 40 Other side stator 48 windings 50 Magnetic Levitation Motor 60 Magnetic Levitation Motor 70 Magnetic Levitation Motor 80 Magnetic Levitation Motor 90 Magnetic Levitation Motor 100 Magnetic Levitation Motor

Claims

1. A rotor that can rotate in the circumferential direction, A one-sided stator is arranged on one axial side of the rotor, The other stator, which is arranged on the axial side of the rotor and has windings, A rotating permanent magnet is provided on the other axial side of the rotor, which is attracted to the other stator, causing the rotor to be attracted to the other axial side, and the magnetic flux generated by the winding is controlled so that the rotor rotates. A permanent magnet is provided on at least one of the axial side of the rotor and the stator on one side, forming an attractive magnetic path between the rotor and the stator on one side, thereby attracting the rotor to the axial side, and when the rotor is displaced radially, the attractive magnetic path is inclined with respect to the axial direction of the rotor. A magnetic levitation motor comprising the above, wherein no windings are provided on the stator on one side.

2. A rotating opposing part provided on the rotor, A fixed opposing portion is provided on the stator on one side, facing the rotating opposing portion, forming the magnetic attraction path between the rotating opposing portion and the rotor, and at least a portion of the opposition with the rotating opposing portion is released when the rotor is displaced radially, A magnetic levitation motor according to claim 1, comprising:

3. The magnetic levitation motor according to claim 2, wherein the surface of the fixed opposing portion facing the rotating opposing portion is arranged along the surface of the rotating opposing portion facing the fixed opposing portion.

4. The magnetic levitation motor according to any one of claims 1 to 3, wherein the magnetic attraction path is formed over the entire circumference of the rotor.

5. A magnetic levitation motor according to any one of claims 1 to 4, wherein a plurality of magnetic attraction paths are formed in the radial direction of the rotor.

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