JP2007060818A - Rotating machine supported by magnetic repulsion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating machine that is supported by magnetic repulsion in which bearings are integrated with small rotary machine elements, and that is driven with low loss and less energy. <P>SOLUTION: In this rotating machine supported by magnetic repulsion, a fixed shaft is structured with a circular cylinder magnetized in the axial direction or a first cylindrical permanent magnet. A cylindrical rotor arranged coaxially to the fixed shaft via a first gap is structured with a second permanent magnet and a third permanent magnet provided integrally on the outside circumference of this second permanent magnet. The second permanent magnet having an inside surface arranged to face the first permanent magnet is magnetized in the axial direction to cause a repulsive force between the first permanent magnet and itself. Furthermore, the third permanent magnet has a plurality of magnetic poles magnetized roughly in the radial direction. Coils that generate rotating magnetic field for the second permanent magnet is arranged around the rotor via a second gap. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a supporting magnetic repulsion rotating machine that supports a rotating body with a magnetic repulsive force, and more particularly to a magnetic repulsion supporting rotating machine in which a bearing and a rotating element are integrated.

    An optical deflection scanning device is known as an application in which high-speed rotation is indispensable. In the optical deflection scanning device, a laser is directed to a rotating polygonal mirror, and the laser is reflected by the rotating polygonal mirror and directed to a photosensitive surface or the like. In the optical deflection scanning apparatus, from the viewpoint of information transmission, the rotation of the polygon mirror is directly linked to the amount of information transmission, and higher speed rotation contributes to greater information transmission. Currently, a rotating polygon mirror that is in practical use is known to use a combination of a hydrodynamic bearing and a magnetic repulsive force, and is capable of high-speed rotation on the order of tens of thousands of rpm.

  However, the optical deflection scanning device has a 6-sided to 12-sided polygonal mirror, and a large windage loss is inevitably generated as it rotates. The windage loss is generally known to be proportional to the cube of the rotational speed, and high speed rotation causes a huge increase in driving power. In order to reduce this windage loss, it is necessary to operate in a vacuum. However, current dynamic pressure bearings use the pressure of the air flow, so operation in a vacuum is not possible. Yes. Therefore, a power-saving high-speed rotating device using a permanent magnet repulsive magnetic bearing that can support the shaft completely magnetically and can realize cost reduction and simplification has been demanded and developed.

Patent Documents 1 to 4 have already been proposed as permanent magnet repulsive magnetic bearings for optical deflection scanning devices. This permanent magnet repulsion type magnetic bearing is an inner rotor vertical axis permanent magnet repulsion type magnetic bearing in which components are gathered in a space of 100 mm on a side, and it has been experimentally confirmed that the magnetic loss at the bearing portion is very small. It is possible to achieve stable rotation at a maximum rotation speed of 50,000 rpm and drive power of 3 W, and this method has been confirmed to be very useful for power-saving small high-speed rotation devices. Can also be applied to pumps. As an example of application of a repulsive levitation type magnetic bearing to a pump, a turbo molecular pump is famous. In the turbo molecular pump, since there are not so many dimensional restrictions, generally, two bearing portions and one motor portion are provided independently. However, Patent Document 5 proposes a system that uses both a bearing unit and a motor unit while being a repulsive levitation type magnetic bearing as a turbo molecular pump.

Furthermore, academic research on bearingless motors is very active at present, and repulsive levitation type magnetic bearings are expected to be applied to bearingless motors. Bearingless motors are assumed to be applied to pumps such as canned pumps, small pumps, blood circulation pumps, spindle drives for information devices such as HD, and the like, and their development has begun.
JP2002-081445A JP2002-365581 JP 2003-148472 A JP 2003-329958 A JP-A-9-182400

  The permanent magnet repulsive magnetic bearings disclosed in Patent Documents 1 to 4 are very useful for power-saving small high-speed rotating devices as described above. However, since the optical deflection scanning device is generally installed as a component of precision equipment, it is structurally difficult to install in the current space of 100 mm on a side. On the other hand, downsizing in a state where the components of the permanent magnet repulsive magnetic bearing are independent causes a problem of size effect, and therefore, a new structural breakthrough is indispensable.

  The system of the repulsive levitation type magnetic bearing disclosed in Patent Document 5 is a type that combines a magnetic bearing system called a total passive type and a motor. However, one problem is that a contact point exists when there is no rotation. Another problem is that in order to add a motor function to the bearing portion, the rotor side or stator side permanent magnet must have a bearing configuration in which the magnetic flux density is uneven in the circumferential direction. . This causes a heat loss due to a change in magnetic flux density at the bearing during high-speed rotation, and induces braking torque.

  A bearingless motor refers to a (motor) device that applies a rotational force while controlling (bearing) the center position of an electric motor, and includes a rotating magnetic field and a position control magnetic field. If the rotating magnetic field of the motor is a synchronous machine, it acts on the magnetic poles of the rotor to rotate the motor while maintaining the synchronous speed. At this time, a position control magnetic field independent of the rotation speed flows in the rotor. That is, when viewed from the rotor coordinate system, the magnetic flux increases or decreases periodically (square wave). In a bearingless motor, there is a problem that this change in magnetic flux generates an eddy current and causes heat loss.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic repulsion supporting rotating machine that is compact, low loss, and driven with low power consumption by integrating a bearing and a rotating machine element. There is.

According to this invention,
A fixed shaft made of a cylindrical or cylindrical first permanent magnet magnetized in the axial direction;
A cylindrical rotor arranged coaxially with respect to the fixed shaft via a first gap, having an inner surface arranged to face the first permanent magnet and magnetized in the axial direction And a second permanent magnet that generates a repulsive force with the first permanent magnet, and a plurality of magnetic poles that are integrally provided on the outer periphery of the second permanent magnet and are magnetized in a substantially radial direction. A rotor composed of a third permanent magnet;
A stator having a coil disposed around the rotor via a second gap and generating a rotating magnetic field with respect to the second permanent magnet;
There is provided a magnetic repulsion supporting rotating machine characterized by comprising:

  According to the present invention, there is provided a magnetic repulsion support rotating machine that is compact, low loss and power-saving driven by integrating a bearing and a rotating machine element, and this magnetic repulsion support rotating machine is compared with an existing type rotating machine. In principle, it can be operated with the lowest loss. That is, by integrating the repulsive levitation type magnetic bearing, which is a simple magnetic bearing system without mechanical contact, and the motor drive mechanism, the repulsive levitation type magnetic bearing and various bearingless motors have been problems. It is compact and can increase the ratio of shaft length (D / L ratio), enabling reduction of heat loss at the bearing, ultra high speed rotation, and high efficiency operation. That is, in the magnetic repulsion support rotating machine of the present invention having both floating and rotation, it is possible to increase the shaft length ratio (D / L ratio), and to achieve further miniaturization and high versatility. .

  According to the present invention, the two problems of space saving in a repulsive levitation type magnetic bearing, which is a kind of magnetic bearing, and reduction in rotational loss in a bearingless motor can be solved at a time.

  The repulsive levitation magnetic bearing is a system that minimizes and stabilizes the number of control axes, and has advantages such as simplification of the configuration and peripheral devices and low rotation loss. However, as can be said for magnetic bearings in general, the ratio of the shaft length to the shaft diameter (D / L ratio) tends to be small because two bearing portions and one motor portion are independent. In the bearingless motor, since one or two bearing portions are also used as the motor, the shaft length ratio (D / L ratio) is large, and the apparatus can be miniaturized. However, a bearingless motor needs to generate a supporting magnetic flux at the same time as the rotating magnetic flux. As a result, the rotating body always links with the supporting magnetic flux, and the higher the speed, the more the magnetic flux at this time becomes a cause of loss. It becomes. On the other hand, the magnetic repulsion support rotating machine with the motor function added to the bearing part of the repulsive levitation type magnetic bearing of the present invention realizes high speed rotation, small size and light weight, low rotation loss, high efficiency, low environmental load can do.

  Hereinafter, a magnetic repulsion support rotating machine according to an embodiment of the present invention will be described with reference to the drawings as necessary.

  FIG. 1 schematically shows the entire structure of a magnetic repulsion support rotating machine including a motor / bearing portion according to an embodiment of the present invention. The magnetic repulsion support rotating machine shown in FIG. 1 includes a base 1, and a housing portion 2 is placed and fixed on the base 1, and a housing portion 3 is further placed and fixed on the housing portion 2. Yes. Although the housing parts 2 and 3 are depicted as separate bodies in FIG. 1, it is obvious that the housing parts 2 and 3 may be configured as an integral housing part. On the base 1 in the casing 2, a dish-shaped casing 8 having a cylindrical protrusion 8 a around the base 1 is disposed in a state of being fitted to the casing 2. The base 1, the casing unit 2, the casing unit 3 and the casing unit 8 constitute a casing of the rotating machine. A cylindrical motor yoke 12 is fixed to the cylindrical protruding portion 8a of the housing portion 8, and a cylindrical motor winding 11 is similarly arranged and fixed on the inner peripheral surface of the cylindrical protruding portion 8a. The motor yoke 12 is naturally made of a magnetic material (for example, iron).

  A base of a point contact auxiliary shaft 9 disposed along the central axis of the casing is fixed to the base 1 and the casing 8. The point contact auxiliary shaft 9 is made of a non-magnetic material, and the front end of the casing is rounded into a hemispherical shape so as to support the cylindrical rotation shaft 10 on the central axis. Point contact with the inner partition wall surface. The point contact auxiliary shaft 9 is fitted to the cylindrical rotor magnet 5b. The cylindrical rotating shaft 10 is also made of a nonmagnetic material, and a cylindrical rotor magnet 5a is fixed on the inner peripheral surface of the cylindrical rotating shaft 10 so as to face the rotor magnet 5b with a gap therebetween. A cylindrical motor magnetic pole magnet 7 is fixed on the outer peripheral surface of the cylindrical rotating shaft 10 so as to face the cylindrical motor winding 11 with a gap. As will be described later, the motor magnetic pole magnet 7 is composed of segments having a plurality of poles arranged symmetrically around the central axis of the housing, and each segment is magnetized in the radial direction (radial direction), or Each segment is magnetized in the radial direction (radial direction) and the circumferential direction. The cylindrical rotor magnets 5a and 5b are magnetized in the axial direction so as to repel each other in the radial direction (radial direction), as will be described in detail later. The cylindrical rotor magnets 5 a and 5 b, the motor magnetic pole magnet 7 and the motor winding 11 constitute a magnetic repulsion support rotating unit 16.

  In the magnetic repulsion support rotating unit 16 shown in FIG. 1, the cylindrical rotating shaft 10 is point contact supported in the thrust direction (axial direction) by the fixed point contact auxiliary shaft 9, and is magnetized in the axial direction. The cylindrical rotating shaft 10 is bearing-supported in the radial (radial) direction by the repulsive force generated between the cylindrical rotor magnets 5a and 5b. Further, the motor is constituted by the cylindrical motor magnetic pole magnet 7 and the cylindrical motor winding 11 arranged on the outer periphery of the cylindrical rotor magnets 5a and 5b. That is, in the magnetic repulsion support rotating unit 10 shown in FIG. 1, the magnet 7 is synchronized with the rotating magnetic field generated from the cylindrical motor winding 11 so that the cylindrical rotating shaft 10 becomes the point contact auxiliary shaft 9 and the cylindrical shape. The bearings are supported by the rotor magnets 5a and 5b and rotated.

  The cylindrical rotary shaft 10 is further fitted and fixed with a base portion 19a of a rotary shaft 19 disposed on the axis of the housing, and its flange portion 19b is mounted and fixed on the rotary shaft 10 so that both are integrally connected. Has been. A disc-shaped electromagnet suction plate 13 made of a magnetic material (for example, iron) is placed and fixed on the flange portion 19b. The disc-shaped electromagnet suction plate 13 is provided with a convex inner ring portion 13a so as to surround the periphery of the rotary shaft 10, and a convex outer ring portion 13b is also provided on the outer periphery thereof. A disc-shaped electromagnet core 14 made of a magnetic material (for example, iron) is similarly fixed to the inner surface of the casing 3 so as to face the electromagnet suction plate 13. An insertion hole is provided at the center of the disc-shaped electromagnet core 14, and the auxiliary shaft 9 extends through the insertion hole with a gap between them. The electromagnet core 14 is provided with a ring-shaped recess. The electromagnetic coil 15 is stored in the recess. Convex inner and outer ring portions 14a and 14b are provided on the inner and outer peripheral sides of the ring-shaped recess so as to face the convex inner ring portion 13a and the convex outer ring portion 13a, respectively. And a corresponding ring portion 14a, and a gap is also provided between the ring portion 13b and the corresponding ring portion 14b. The ring part 13a, the gap, the ring part 14a, the ring part 13b, the gap, and the ring part 14B constitute a magnetic circuit for the electromagnetic coil 15. When the electromagnet coil 15 is energized, the magnetic flux passes through this magnetic circuit. Accordingly, a suction force is generated between the ring portion 13a and the ring portion 14a and between the ring portion 13b and the ring portion 14b, and the flange portion 19b is lifted, and the point contact auxiliary shaft 9, the rotary shaft 10 and the rotary shaft 19 are used as axes. Is surfaced along. Therefore, the cylindrical rotating shaft 10 is supported on the point contact auxiliary shaft 9 by the point contact auxiliary shaft 9 in a point contact or non-contact manner.

  A ring-shaped axial force adjusting screw 4 that can be finely moved along the casing axis is attached to the inner surface of the upper opening of the casing 3 via a ring member 20 so as to close the opening. A ring-shaped stator magnet 6 b is attached to the inner surface of the axial force adjusting screw 4. A ring-shaped rotor magnet 6a is fixed to the rotating shaft 19 so as to be disposed opposite to the stator magnet 6b. A gap is provided between the outer surface of the rotor magnet 6a and the inner surface of the stator magnet 6b, and the rotary shaft 19 is arranged on the axis of the housing by a radial (radial) repulsive force generated between the two. It is supported. The axial force adjusting screw 4 is screwed to the ring member 20 so as to be movable in the axial direction. By moving the axial force adjusting screw 4 along the axis, the outer surface of the rotor magnet 6a facing each other and The facing area between the inner surface of the stator magnet 6b is adjusted. Therefore, the repulsive force between the rotor magnet 6a and the stator magnet 6b corresponding to the facing area is adjusted. As a result, it is possible to adjust the steady attractive force in the electromagnetic coil 15 by fine adjustment of the axial repulsive force. Accordingly, it is possible to balance the axial force (repulsive force, suction force, gravity).

  In the magnetic repulsion support rotating machine shown in FIG. 1, the radial bearing formed by the rotor magnet 6 a and the stator magnet 6 b is further provided with a motor magnetic pole magnet and a motor winding, like the magnetic repulsion support rotation unit 16. The magnetic repulsion support rotation unit may be configured. That is, the structure constituting the magnetic repulsion support rotation unit 16 may be provided in the opening of the housing unit 3.

  In the magnetic repulsion support rotating machine shown in FIG. 1, the structure of the magnetic repulsion support rotating unit 16 in which the motor function and the bearing function are arranged on the same vertical plane with respect to the rotation shaft reduces the shaft length and reduces the shaft length. The ratio (ratio of length (L) to shaft diameter (D): D / L ratio) can be increased.

  The structure of the magnetic repulsion support rotation unit 16 will be described in more detail with reference to FIGS. 2 (a) and 2 (b). FIG. 2A schematically shows the structure of the magnetic repulsion support rotating portion 16 shown in FIG. 1, and FIG. 2B schematically shows the basic structure of a bearingless motor as a comparative example. . It should be noted that in FIG. 2A, the bearing 9 shown in FIG. 1 is omitted for the purpose of simplifying the drawing.

  In the magnetic repulsion support rotation unit 16 shown in FIG. 2A, the bearing unit and the motor drive unit using the repulsion of the permanent magnet are integrated. That is, in the arrangement of the permanent magnets of the bearings in the magnetic repulsion support rotating portion 16, two cylindrical permanent magnets MG1 and MG2 corresponding to the rotor magnets 5a and 5b axially magnetized inside thereof are interposed via the gap G1. A cylindrical magnet MG3 is coaxially arranged as a field magnetic pole composed of a plurality of fan-shaped permanent magnet segments for a motor magnetic pole arranged coaxially and joined to the outside of the cylindrical permanent magnet MG2 via an adhesive layer B. Is arranged. The motor-use cylindrical magnet MG3 is composed of a fan-shaped permanent magnet segment magnetized in the radial direction (radial direction, ie, radial direction) as shown in FIGS. 3 (a) to 3 (c), or It is composed of a combination of a sector permanent magnet segment magnetized in the radial direction and a sector permanent magnet segment magnetized in the circumferential direction. The armature winding MC on the stator side is coaxially applied to the outside of the cylindrical magnet MG3 for motor via a gap G2, and this armature winding MC generates a rotating magnetic field and is connected to the motor shaft. Torque is applied to the formed cylindrical magnet MG3. When this permanent magnet arrangement is used, the change in the magnetic flux density in the circumferential direction can be made extremely small in the gap G1 between the two cylindrical permanent magnets MG1 and MG2. This means to reduce the magnetic loss when trying to realize ultra high speed rotation.

  In FIGS. 2A and 2B, the region drawn with the diagonal lattice pattern indicates the field magnetic pole region where the motor cylindrical magnet MG3 is provided, and the region indicated with the dotted line pattern is The stator region where the armature winding MC is provided is shown, the white region shows the region of the gaps G1, G2, the vertical and horizontal lattice patterns show the permanent magnets MG1, MG2, and the region painted in gray is The area | region where a field iron core is provided is shown. In addition, the arrows in the drawing and perpendicular to the drawing indicate the path of the magnetic flux generated from the armature winding MC.

  In order to deepen the understanding of the structure of the magnetic repulsion support rotating portion 16, the structure of a bearingless motor will be described below as a comparative example.

  FIG. 2B shows the basic structure of the bearingless motor. As shown in FIG. 2B, the rotor of the bearingless motor is provided with a field permanent magnet MG4 around the field iron core F, and a cylinder or reluctance using the field permanent magnet MG4 is changed. Consists of polar shapes. In the bearingless motor, torque is generated by applying a rotating magnetic field to the magnetic poles of the permanent magnet MG4. Magnetic flux (support magnetic flux) for supporting the permanent magnet MG4 as a rotating body with a magnetic force flows so that each coordinate direction (up and down or left and right as indicated by arrows in FIG. 2B) is a magnetic path. That is, the stator side motor coil MCref and the gap G4, and the permanent magnet MG4 and field iron core F as the rotating body, the gap G4, and the stator side motor coil MCref flow in this order. At this time, since the magnetic flux density in the circumferential direction changes greatly, the supporting magnetic flux that vertically cuts through the permanent magnet MG4 as a rotating body increases the magnetic loss when it is intended to realize ultra high-speed rotation. On the other hand, in the permanent magnet arrangement in the magnetic repulsion support rotating part 16 shown in FIG. 2A, the magnetic flux density change in the circumferential direction is caused in the gap G1 between the two cylindrical permanent magnets MG1 and MG2. As a result, it is possible to reduce the magnetic loss when attempting to achieve ultra-high speed rotation. Therefore, on the basis of this fundamental difference, the rotating machine provided with the magnetic repulsion support rotating unit 16 shown in FIG. 2A enables super power saving operation.

  Various structures of the magnetic repulsion support rotation unit 16 will be described with reference to FIGS. 3 (a), 3 (b), and 3 (c). As shown in FIGS. 3 (a), 3 (b) and 3 (c), in the magnetic repulsion support rotating portion 16, the motor / bearing portion is neodymium cylindrical permanent magnet magnetized in the axial direction as shown in FIG. 2 (a). Magnet pairs MG1 and MG2 are prepared and arranged so that the same poles face each other, whereby a repulsive force is generated in the gap between the permanent magnets MG1 and MG2. Permanent magnets MG1 and MG2 are magnetized in the direction of the drawing sheet. 3A, 3B and 3C, an arrow symbol D indicated by a double circle indicates the magnetization direction of the permanent magnets MG1 and MG2.

  Here, the internal cylindrical magnet MG1 is referred to as a stator magnet, and the external cylindrical magnet MG2 is referred to as a rotor magnet. In the magnet arrangement shown in FIG. 3A, when the stator magnet and the rotor magnet are regarded as bearing portions in a repulsive levitation type magnetic bearing, an outer rotor shape is formed. A spacer B of about 1 mm is disposed on the outer periphery of the rotor magnet MG2, and a motor magnetic pole magnet MG3 is disposed on the outer periphery thereof. The motor magnetic pole magnet MG3 is a neodymium system, and a plurality of motor pole magnets having a central angle of 45 degrees are installed. The number of magnetic poles is 2n, and all the motor magnetic pole magnets MG3 are magnetized in the directions indicated by the radial arrows K1 and K2 that are spatially perpendicular to the stator magnet MG1 and the circumferential directions K3 and K4. Is done. The stator magnet MG1 shown in FIG. 3A is composed of eight segments in which a segment magnetized by an arrow K1 and a segment magnetized by an arrow K2 in the direction opposite to the arrow K1 are alternately arranged. It is magnetized to 8 poles. In the stator magnet MG1 shown in FIG. 3 (b), eight segments in which two segments magnetized by the arrow K1 and two segments magnetized by the arrow K2 in the direction opposite to the arrow K1 are alternately arranged. And is magnetized to 4 poles. Further, in the stator magnet MG1 shown in FIG. 3C, the segment magnetized by the arrow K1, the segment magnetized by the arrow K3, the segment magnetized by the arrow K2 in the direction opposite to the arrow K1, and the arrow K3 Is composed of eight segments in which the segments magnetized by the arrow K4 in the opposite direction are alternately arranged and magnetized in a Halbach array. The segment arrangement shown in FIGS. 3A, 3B, and 3C is an example, and the central angle and the number of poles of the magnet segment for magnetic poles are not limited to this, and can take various forms. it can.

  FIGS. 4A, 4B, and 4C are a magnetic pole outer peripheral portion and an inner peripheral portion in three types of magnet arrangements that constitute the magnet MG3 shown in FIGS. 3A, 3B, and 3C, respectively. The magnetic flux density distribution is shown. In FIGS. 4A, 4B, and 4C, the graph of MF (1) indicates the magnetic flux density of the magnetic pole inner periphery, and the graph of MF (2) indicates the magnetic flux density of the magnetic pole outer periphery. Showing minutes. In the graph of the magnetic flux density, the magnetic flux density distribution is shown on the assumption that the rotor magnet MG1 and the stator magnet MG2 are not loaded. From these results, the magnetic flux density is larger at the outer peripheral part of the magnetic pole, and the magnetic flux changes smoothly in the Halbach array, and the difference in magnetic flux density between the inner peripheral part and the outer peripheral part is large, especially in the inner peripheral part. This means that the density is low and the influence on the cylindrical permanent magnet pair is small. Since the Halbach array has an effect of suppressing the spread of magnetic flux, a configuration in which both the rotor and stator magnets MG1 and MG2 are arranged in the Halbach array in the axial direction is also conceivable.

  5 (a) and 5 (b) show the magnetic flux density distribution in the vicinity of the gap G1 (between the rotor magnet MG2 and the stator magnet MG1) in the motor / bearing portion shown in FIGS. 3 (b) and 3 (c). It is measured from the axial direction. As shown in FIGS. 5A and 5B, the spatial disturbance is small in the magnetic flux density in the vicinity of the gap G1, and particularly in the case of the Halbach array as shown in FIG. 5B. . When the magnetic flux density is uniform in the rotor-stator gap G1, in principle, the magnetic loss is zero, so that super-power-saving operation is enabled.

  The present invention is a mixture of the concepts of a repulsive levitation type magnetic bearing and a bearingless motor as existing technologies, and a rotating machine having the advantages of both can be realized. Recent advances in bearingless motor technology are remarkable. The present invention in which the bearingless is used instead of a mere rotating machine like the existing magnetic attraction type bearingless motor can be greatly expected for research development thereafter.

  The subject of the present invention is suitable for power-saving high-speed rotation, and is likely to be used by motor-related companies and companies handling precision equipment and information equipment. In addition, it can be used in a special atmosphere, and since it is a bearing system with a relatively large distance between the rotor and the stator, it is considered highly available in pump-related companies.

It is a longitudinal cross-sectional schematic diagram which shows schematically the whole structure of the magnetic repulsion support rotary machine which included the motor and bearing part which concerns on one embodiment of this invention. (A) is a cross-sectional schematic diagram which shows schematically the structure of the magnetic repulsion support rotation part 16 shown by FIG. 1, (b) shows schematically the basic structure of the bearingless motor as a comparative example. It is a cross-sectional schematic diagram shown. (A), (b) and (c) are schematic diagrams showing various structures of the magnetic repulsion support rotating unit 16 shown in FIGS. 1 and 2 (a). (A), (b) and (c) is a graph which shows magnetic flux density distribution in the inner and outer periphery part of the motor magnet in the magnet arrangement | sequence shown to FIG. 3 (a), (b) and (c). (A) And (b) is the graph which measured magnetic flux density distribution between the rotor magnet and stator magnet in the magnet arrangement | sequence shown to FIG.3 (b) and (c) from the axial direction.

Explanation of symbols

  1. . . Base, 2,3. . . Case part, 5a, 5b. . . 6. a rotor magnet; . . 7. Motor pole magnet, . . 8. a dish-shaped housing part; . . 9. Auxiliary shaft for point contact . . A cylindrical rotating shaft; 11. . . Motor windings, 12. . . Cylindrical motor yoke, 16. . . 18. Magnetic repulsion support rotation unit, . . Rotation axis, 20. . . Ring member

Claims (4)

A fixed shaft made of a cylindrical or cylindrical first permanent magnet magnetized in the axial direction;
A cylindrical rotor arranged coaxially with respect to the fixed shaft via a first gap, having an inner surface arranged to face the first permanent magnet and magnetized in the axial direction And a second permanent magnet that generates a repulsive force with the first permanent magnet, and a plurality of magnetic poles that are integrally provided on the outer periphery of the second permanent magnet and are magnetized in a substantially radial direction. A rotor composed of a third permanent magnet;
A stator having a coil disposed around the rotor via a second gap and generating a rotating magnetic field with respect to the second permanent magnet;
A magnetic repulsion support rotating machine comprising:     The said 2nd permanent magnet is comprised from the magnetic segment by which the 1st magnetic pole and the 2nd magnetic pole opposite to this 1st magnetic pole are alternately arranged around the said rotor. Magnetic repulsion support rotating machine.     2. The magnetic repulsion supporting rotating machine according to claim 1, wherein the magnetic segments are arranged symmetrically with respect to a rotation axis.     The second permanent magnet includes a first magnet segment magnetized in a first direction along the radial direction, a second magnet segment magnetized in a second direction opposite to the first magnetic pole, and A third direction and a fourth magnetic pole segment magnetized in a third direction along the periphery of the rotor and in a direction opposite to the third direction; an arrangement of the first, third and second magnetic pole segments; 2. The magnetic repulsion supporting rotating machine according to claim 1, wherein the first, fourth and second magnetic pole segments are arranged in an alternating manner around the rotor.

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