WO2005029684A1

WO2005029684A1 - A motor without bearing

Info

Publication number: WO2005029684A1
Application number: PCT/CN2003/000804
Authority: WO
Inventors: Leelong Chen; Shihming Huang; Sean Chang; Wenshi Huang
Original assignee: Delta Electronics,Inc.
Priority date: 2003-09-22
Filing date: 2003-09-22
Publication date: 2005-03-31
Also published as: DE10394240B4; JP2007507193A; GB2417616B; AU2003272842A1; GB0523430D0; GB2417616A; CN100472916C; CN1771651A; DE10394240T5

Abstract

The present invention relates to a kind of motor without bearing, comprising a stator, a rotor, a upper magnetic structure and a lower magnetic structure. The stator is located in a housing, the rotor is located in the housing and configured correspondingly with the stator. The rotor is provided with a shaft , which extends axially and protrudes from the rotor, and the shaft does not contact with the stator or the housing. The lower magnetic structure is located on the bottom of the housing , and the upper magnetic structure is located on the top of the housing. Meanwhile, the positions of the upper magnetic structure and the lower magnetic structure are opposite axially .Thereinto, the upper magnetic structure and the lower magnetic structure attract each other, and the shaft is fixed between the upper magnetic structure and the lower magnetic structure by the attraction .

Description

Bearingless motor

Technical field

The present invention relates to a motor, and more particularly to a non-bearing motor with high power, long life, and low noise.

Background technique

In today's motors, in order to make it run smoothly, the shaft portion of the rotor is generally covered by a bearing so that the rotor can run smoothly against the support of the bearing. The conventional bearings are bearings, bearings, oil bearings, dynamic pressure bearings, magnetic bearings, etc. However, each of the aforementioned bearings has its own advantages and disadvantages. Palin bearings are also called ball bearings, which are composed of an outer ring, an inner ring, and a plurality of metal balls, where each metal ball is located between the inner ring and the outer ring. Since the operation of this type of bearing is performed by the rotation of multiple metal balls, and the contact between each metal ball and the inner ring (or outer ring) is a point contact, it is relatively easy to perform a running operation. However, because the structure of such bearings is quite fragile, they cannot withstand the impact of external forces. Furthermore, when the motor using this bearing is running. Because the metal ball runs in a rolling manner, it produces a lot of noise at high speeds. Furthermore, metal beads, inner rings, and outer rings require high precision, so they are expensive.

Oil-containing bearings are also called powder sintered self-lubricating bearings. They are formed by mixing metal powders such as copper powder, iron powder, nickel powder, and lead powder to sinter the bearing shape, and then dipping the lubricant into the bearing pores. When an oil bearing is used in the motor, the oil bearing is fixed at the center position of the motor stator, and the shaft center of the rotor is placed in the bearing. At this time, an appropriate gap must be maintained between the bearing and the shaft center. When the motor is running, lubricating oil will leak out of the bearings to make the rotor rotate with lubrication. These bearings have higher impact resistance than ball bearings, and they are also cheaper. However, when such bearings are used in motors, long-term operation will cause the lubricating oil in the bearings to evaporate, causing the shaft center to directly rub against the bearings, and even the formation of nitrides that hinder operation at both ends of the bearings, making them easily damaged and Increase the amount of noise. In addition, the dust in the air will be sucked into the core of the motor due to the operation of the fan motor, which will be mixed with the lubricant stored around the bearing to form sludge, which will cause running noise and even become stuck. In addition, the gap between the bearing and the shaft center is small, and the motor starting effect is poor.

The dynamic pressure bearing is a deformation of the aforementioned oil-containing bearing. It is formed with two-row arrow-shaped grooves on the inner side wall surface, so that when the motor is running, the lubricating oil and air in the bearing are squeezed from the sides of the arrow to the tip of the groove Pressure to form two oil and gas rings to support the axis. When such bearings are used in motors, because the oil and gas are collected at the tip of the groove, the oil and gas are less likely to be lost and their service life is longer than that of oil-containing bearings. However, the grooves on the inner side of the dynamic pressure bearing can be formed only through an extremely precise machining process, and the clearance between the shaft center and the bearing needs to be accurately grasped. Therefore, the production cost of the dynamic pressure bearing is much higher than the aforementioned bearings. Furthermore, when the speed of the motor is low, since the oil and gas cannot form an oil and gas ring, the dynamic pressure effect cannot be produced at the time of low rotation, and the effect is the same as that of the oil bearing.

Magnetic levitation bearings are formed with multiple N-S magnetic poles on the shaft center, and the same N-S magnetic poles as the shaft center are formed at the relative positions of the bearings. When the motor is running, the shaft center is suspended by magnetic repulsion. On the bearing. Since the shaft center and the bearing are not in contact with each other at this time, there is no problem of friction noise during operation. However, due to the current design of the magnetic bearing, the distance between the shaft center and the bearing is maintained at 0.2 mm or less under static conditions, so the parts of the bearing around the shaft center to the center of the circle The generated thrusts are equal and offset each other. At this time, when the shaft center is shifted due to external force or its driving force, its balance will be broken, and the shaft center will easily collide with the bearing during operation. Its noise is increased, its life is shortened, and even smooth operation is not possible.

Furthermore, the magnetic bearing described above also suffers from problems such as failure to start smoothly due to its magnetic balance. Therefore, the magnetic bearing is still in the experimental stage and cannot enter the mass production stage smoothly. SUMMARY OF THE INVENTION Therefore, in order to solve the above problems, the present invention proposes a bearingless motor to greatly reduce the amount of motor operation noise. Furthermore, the present invention further proposes a bearingless motor to greatly improve the motor's operating life. Furthermore, the present invention further proposes a bearingless motor to greatly reduce production costs. Therefore, the present invention provides a bearingless motor, which is composed of a fixed structure, a rotor structure, and an upper and a lower magnetic structure. The stator structure is located in the housing, and the rotor structure is also located in the housing and is arranged corresponding to the stator structure. The rotor structure has a shaft center, and the shaft center is an axially extending and protruding rotor structure, and the shaft center does not contact the stator structure or the housing. The lower magnetic structure is located at the bottom of the housing, the upper magnetic structure is located at the top of the housing, and the upper magnetic structure and the lower magnetic structure are located at axially opposite positions, respectively. The upper magnetic structure and the lower magnetic structure are attracted to each other, and the shaft center is fixed between the upper and lower magnetic structures by magnetic attraction. In the bearingless motor of the present invention, the shaft center is attracted (or contacted) with the upper magnetic structure, attracted (or contacted) with the lower magnetic structure, or attracted (or contacted) with the upper and lower magnetic structures at the same time. Furthermore, the bearingless motor of the present invention may also have at least one wear-resistant structure, which is located between the shaft center and the lower magnetic structure, between the shaft center and the upper magnetic structure, or between the shaft center and the upper and lower magnetic structures. . When the shaft is in contact with the wear-resistant structure, the contact method is point contact. The bearingless motor of the present invention described above. It further includes a magnetic structure annularly arranged on the rotor structure and a stator magnetically permeable structure annularly arranged on the structure, and the position of the stator magnetically permeable structure corresponds to the magnetic structure on the rotor structure. The magnetic force center plane of the magnetic structure of the rotor structure may be slightly higher than, slightly lower than, or parallel to the magnetic force center plane of the stator magnetic conductive structure in the axial direction.

Furthermore, in the above bearingless motor of the present invention, when the stator structure is covered in the rotor structure, its axis can extend into the opening in the center of the stator structure, and a protective structure can be formed on the side wall of the opening. The structure is not in contact with the axis.

In the above bearingless motor of the present invention, the surface shape of the end of the shaft center may be flat, arc-shaped, tapered, concave or convex, and the upper magnetic structure or the lower magnetic structure faces the axial center. The shape of the end surface is flat, arc-shaped, tapered, concave or convex. When the shaft center and the upper magnetic structure or the lower magnetic structure are in point contact with each other, the shape of the end surface of the shaft center corresponds to the shape of the end surface of the upper magnetic structure or the shape of the end surface of the lower magnetic structure. Furthermore, the surface shape of the end portion of the wear-resistant structure facing the axis may also be planar, arc-shaped, tapered, concavely curved, or convexly curved. When the axis and the wear-resistant structure are in point contact with each other, The shape of the end face of the shaft center and the end face of the wear-resistant structure correspond to each other.

The bearingless motor of the present invention described above may have a plurality of blades around the periphery of the rotor structure. These fans may be centrifugal fans, flat fans or axial fans. The casing may be composed of an upper casing and a lower casing. The joining method of the upper case and the lower case may be fitting, clamping, adhering, locking, or respectively fixing through a buffer structure. Specifically, the upper case and the lower case are, for example, corresponding hook-and-hook combinations.

In the above bearingless motor of the present invention, the upper and lower magnetic structures and the shaft center share the same axis. Furthermore, the present invention further provides a bearingless motor suitable for a fan motor, which is composed of a stator structure, a rotor structure, a plurality of fan blades, and a supporting magnetic structure. The stator structure resides on a base. The stator structure has at least a certain magnetic permeability structure. The stator magnetic permeability structure is ring-shaped on the fixed structure. The rotor structure is located on the base. The rotor structure has a shaft center and at least one magnetic structure. The shaft center is an axially extending and protruding rotor structure. The magnetic structure is ring-shaped on the rotor structure, and the position of the magnetic structure is corresponding to the magnetically permeable structure. The fan blade is around the periphery of the rotor structure, and the supporting magnetic structure is fixed on the base. The supporting magnetic structure fixes the shaft center by magnetic attraction, and the supporting magnetic structure contacts the shaft center in a point contact manner. Among them, the magnetic force center plane on the rotor structure is slightly higher in the axial direction than the magnetic force center plane determined on the structure. In the above bearingless motor of the present invention, only a little bit of the rotor shaft center is in contact with the stator structure, and even it is completely out of contact due to the gas buoyancy during operation, so the amount of motor noise can be greatly reduced and the motor operating life can be improved.

In addition, the bearingless fan motor of the present invention can make the rotor shaft center run without contact by the magnetic attraction of the shaft center and the air buoyancy during fan operation, which can greatly reduce the amount of motor noise and increase the life of the motor. .

Furthermore, since the bearingless motor of the present invention does not need to use a conventional bearing, the manufacturing and assembly costs of the component can be avoided, and the production cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a structure of a bearingless motor according to a first preferred embodiment of the present invention; FIG. 2 is a schematic diagram showing a structure of a bearingless motor according to a second preferred embodiment of the present invention; 3D is a partial view showing the shaft center and magnetic structure of the bearingless motor of the present invention Intention

FIG. 4 is a schematic structural diagram of a bearingless motor according to a third preferred embodiment of the present invention; FIG. 5 is a schematic structural diagram of a bearingless motor according to a fourth preferred embodiment of the present invention. Symbol Description:

100, 200, 300, 400: Bearingless motor

102, 208: Housing

102a: upper case

102b: lower case

104: Stator structure

106: rotor structure

108, 110, 118, 202, 202a, 202b, 202c, 202d, 302, 304, 402: magnetic structure

112: Stator mount

114: Stator Magnetic Structure

116, 116a, 116b, 116c, 116d: axis

120: Magnet case

122: Fan Blade

124, 126, 206, 406, 408: Wear-resistant structure 128: Protective structure 130: Opening

132: rotor housing

204, 404: Magnetic body

Pl, P2: magnetic center plane detailed description

In order to make the foregoing and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is hereinafter described in detail with reference to the accompanying drawings, as follows:

FIG. 1 is a schematic structural diagram of a bearingless motor according to a first preferred embodiment of the present invention. Please refer to FIG. 1. The bearingless motor 100 of the present invention is composed of a housing 102, a stator structure 104, a rotor structure 106, and a magnetic structure 108. The magnetic structure 108 and the magnetic structure 110 attract each other, and the magnetic structures 108, 110 The shaft center 116 of the rotor structure 106 is a common axis. In the bearingless motor 100 of the present invention, the rotor structure 106 is fixed between the magnetic structures 108 and 110 only by the magnetic attraction of the magnetic structures 108 and 110 to the shaft center 116 thereof.

The housing 102 serves as a protective shell of the bearingless motor 100 to prevent the internal components of the bearingless motor 100 from being damaged by external forces. The casing 102 may be integrally formed, or may be formed by combining the upper casing 102a and the lower casing 102b. It can also be divided into multiple parts and combined. The coupling method of the upper casing 102a and the lower casing 102b is, for example, fitting, clamping, adhering, locking, and respectively fixing through a buffer structure. In addition, the upper case 102a and the lower case 102b are, for example, corresponding hook and hook combinations (as shown in FIG. 1).

The stator structure 104 is located in the housing 102 and is used to generate an induced current or provide a driving force for a rotor structure 106 described later. The stator structure 104 is composed of a circuit board (not shown), a fixed seat 112, and at least a certain magnetically conductive structure 114. The stator structure 104 and the shaft center 116 described below are not in contact with each other. The stator magnetic conductive structure 114 is ring-shaped on the stator structure 104 and has a magnetic center plane P1. The stator magnetic conductive structure 114 is, for example, a silicon steel sheet or an electromagnet.

The rotor structure 106 is located in the housing 102 and is arranged corresponding to the stator structure. 106 is rotatable on the casing 102. The rotor structure 106 is constituted by a shaft center 116, a rotor housing 132, at least one magnetic structure 118, and a magnet guide shell 120. The shaft center 116 is an axially extending protruding rotor structure 106 and serves as a rotation axis when the rotor structure 106 rotates. The surface shape of the end portion of the shaft center 116 is, for example, a flat shape, an arc shape, a pointed shape, a concavely curved surface, or a convexly curved surface.

The magnetic structure 118 is ring-shaped on the rotor structure 106 and has a magnetic center plane P2. The position of the magnetic structure 118 corresponds to the stator magnetically conductive structure 114, and the positions of the magnetic center plane P2 and the magnetic center plane P1 are slightly higher in the axial direction, parallel in the axial direction, or slightly lower in the axial direction. The magnetic structure 118 is, for example, a permanent magnet or a plastic magnet.

In addition, a plurality of fan blades may also be surrounded on the periphery of the rotor structure 106 to generate an air field flow near the bearingless motor 100 when the rotor structure 106 rotates. The fan blade 122 is, for example, a centrifugal fan blade, a flat fan blade, or an axial fan blade.

The magnetic structures 108 and 110 are respectively located at the bottom and the top of the housing 102, and the distribution positions of the magnetic structures 108 and 110 are respectively located at axially opposite positions. The magnetic structures 108 and 110 are, for example, permanent magnets, plastic magnets, and electromagnets. The magnetic structures 108 and 110 can be fixed to the housing 102 by, for example, gluing, fitting, clamping, bonding, or the like. The part of the magnetic structure 108 facing the magnetic structure 110 has the opposite magnetic property as the part of the magnetic structure 110 facing the magnetic structure 108. The surface shape of the magnetic structures 108 and 110 facing the axis 116 and the surface shape of the end of the axis 116 are curved surfaces in point contact with each other. The surface shape of the magnetic structure 116 is, for example, planar, arc-shaped, tapered, or concavely curved. Convex surface.

The magnetic structures 108 and 110 and the axis 116 are located on the same axis. Because the magnetic structures 108 and 110 and the shaft center 116 are maintained on the same axis together by magnetic attraction, the shaft center 116 is fixed between the magnetic structures 108 and 110. When the bearingless motor 100 is not started, the shaft 116 is only It is in contact with the magnetic structure 108 in a point contact manner, but is not in contact with other components outside the rotor structure 106.

In addition, the shaft center 116 may be changed to contact the magnetic structure 110 only by point contact, so that the rotor structure 106 is suspended in the housing 102. In addition, the shaft center 116 may be changed to contact the magnetic structures 108 and 110 at the same time in a point contact manner, so that the rotor structure 106 is held in the housing 100 by the magnetic structures 108 and 110.

Furthermore, in order to further improve the life of the bearingless motor 100, a wear-resistant structure 124, 126 may also be formed between the shaft center 116 and the magnetic structures 108, 110, wherein the shaft center 116 only contacts the wear-resistant structures 124, 126. It is fixed between the magnetic structures 108 and 110 by the magnetic attraction of the magnetic structures 108 and 110. The wear-resistant structures 124 and 126 may be formed on the magnetic structures 108 and 110 at the same time, or may be formed only on the portion where the shaft center 116 contacts the magnetic structure (that is, only the wear-resistant structure 124 is formed on the magnetic structure 108 or only A wear-resistant structure 126 is formed on the magnetic structure 110. The abrasion-resistant structures 124 and 126 are formed, for example, by bonding, clamping, fitting, and joining. In addition, the wear-resistant structures 124 and 126 may be in contact with the magnetic structures 108 and 110 or may not be in contact with the magnetic structures 108 and 110, and need only be located on the axis formed by the shaft center 116 and the magnetic structures 108 and 110.

Furthermore, in order to prevent the shaftless motor 100 from colliding with the fixed base 112 due to the extreme external force during the transportation of the bearingless motor 100, a protective structure 128 may also be formed on the opening 130 inside the stator fixed base 112, The protection structure 128 and the shaft center 116 are not in contact with each other. The material of the protective structure 128 is, for example, plastic, elastic material, or shock-absorbing material.

FIG. 2 is a schematic structural diagram of a bearingless motor 200 according to a second preferred embodiment of the present invention. In this preferred embodiment, the same components as in the previous embodiments are given the same reference numerals. The difference between this preferred embodiment and the first preferred embodiment is that this preferred embodiment uses only a single magnetic junction The structure 202 attracts the shaft center 116 of the rotor structure 106, and the magnetic center plane P2 of the magnetic structure 118 is higher than the magnetic center plane P1 of the stator magnetic conductive structure 114. In addition, the position where the axis 116 and the magnetic structure 202 are in point contact may be slightly higher than, parallel to, and slightly lower than the magnetic force center plane P2.

In this preferred embodiment, the magnetic structure 202 may be directly formed integrally from a magnetic substance, or may be composed of a wear-resistant structure 206 and a magnetic body 204. Furthermore, the surface where the magnetic structure 202 and the axis 116 are in contact with each other or the surface where the wear-resistant structure 206 and the axis 116 are in contact with each other are curved surfaces in point contact with each other. The surface of the wear-resistant structure 206 or the magnetic structure 202 is, for example, an arc shape, a tapered shape, a concavely curved surface, or a convexly curved surface. Next, the relationship between the axis 116 and the magnetic structure 202 will be further explained by taking an example. When the end of the axis 116a is a convex tapered or arc-shaped curved surface, the surface of the magnetic structure may be a concave curved surface as shown in FIG. 3A or a concave concave surface as shown in FIG. 3B. When the surface of the magnetic structure 202 is a convex tapered or arc-shaped curved surface, the end surface of the axis 116a may be a concave curved surface as shown in FIG. 3C or a concave cone surface as shown in FIG. 3D.

FIG. 4 is a schematic structural diagram of a bearingless motor 30o according to a third preferred embodiment of the present invention. In this preferred embodiment, the same components as in the previous embodiments are given the same reference numerals. The difference between this preferred embodiment and the second preferred embodiment is that in this preferred embodiment, a magnetic structure 304 is formed on the top of the stator circumferential fixing seat 112, and a magnetic structure 302 is formed on the rotor housing 132. The magnetic structure 302, 304 is magnetically attracted to each other and does not touch each other. The magnetic structure 304 is not in contact with the stator magnetically conductive structure 114, and the magnetic structure 304 is preferably higher than the stator magnetically conductive structure 114 in the axial direction. The shape of the magnetic structure 304 is, for example, a ring shape, a fan shape, a block shape, or a strip shape, and the shape and position of the magnetic structure 302 correspond to the magnetic structure 302.

In addition, the manner in which the magnetic structure 304 is combined with the stator fixing base 112 is, for example, movable coupling, fitting, clamping, and joining. The magnetic structure 302 is combined with the rotor case 132 in a manner such as bonding, fitting, Clamping and joining.

FIG. 5 is a schematic structural diagram of a bearingless motor 400 according to a fourth preferred embodiment of the present invention. In this preferred embodiment, the same components as in the previous embodiments are given the same reference numerals. The difference between this preferred embodiment and the third preferred embodiment is that the preferred embodiment forms a magnetic structure 402 only on the top of the housing 102 (ie, the upper housing 102a), and the magnetic center plane P2 of the magnetic structure 118 It is lower than the magnetic force center plane P1 of the stator magnetic conductive structure 114. Furthermore, a wear-resistant structure 408 may also be formed on the lower casing 102b, where the point where the axis 116 is in point contact with this wear-resistant structure 408 may be slightly above, 'parallel to, and slightly below the magnetic center plane Pl.

In this preferred embodiment, the magnetic structure 402 may be directly formed integrally from a magnetic substance, or may be composed of a wear-resistant structure 406 and a magnetic body 404. In addition, the surface where the magnetic structure 402 and the shaft center 116 contact each other, the wear-resistant structure 406 and the shaft center, or the surface where the wear-resistant structure 408 and the shaft center 116 contact each other are curved surfaces in point contact with each other. The surface of the wear-resistant structure 406, 408 or the magnetic structure 402 is a convex or concave shape corresponding to the axis 116, such as a circular arc shape, a tapered cone shape, a concavely curved surface, a convexly curved surface.

In addition, although the bearingless motor of the present invention is described as being applicable to an axial flow fan motor, it is not limited thereto, and can also be applied to a frameless fan motor, a centrifugal fan motor, an outer rotor motor, and an inner rotor. Various types of motors, such as motors.

In the bearingless motor of the present invention described above, only a little bit of the rotor shaft center is in contact with the fixed structure, and even it is completely out of contact due to gas buoyancy during operation, so that the amount of motor noise can be greatly reduced and the motor operating life can be improved.

Furthermore, the bearingless fan motor of the present invention can make the rotor shaft center run without contact by the airflow buoyancy of the shaft magnetic attraction force during the fan operation, which can greatly reduce the horse. It can reach the amount of noise and increase the life of the motor.

Claims

Rights request

1. A bearingless motor, characterized in that the motor comprises:

A substructure, located in a shell;

A rotor structure, which is located in the casing and is arranged corresponding to the stator structure, the rotor structure has an axial center, and the axial center is not in contact with the stator structure or the casing;

A first magnetic structure located at the bottom of the casing; and

A second magnetic structure is located on the top of the casing, and the first magnetic structure and the second magnetic structure are respectively located at axially opposite positions;

The first magnetic structure and the second magnetic structure are attracted to each other, and the axis is fixed between the first magnetic structure and the second magnetic structure by magnetic attraction. The first magnetic structure and the second magnetic structure The structure and the shaft center share a common axis.

2. The bearingless motor according to claim 1, wherein: the shaft center is in contact with or magnetically attracted to the first magnetic structure, is in contact with or magnetically attracted to the second magnetic structure, or is simultaneously with the The first magnetic structure and the second magnetic structure are in contact or magnetically attracted,

The contact method is point contact.

3. The bearingless motor according to claim 1, further comprising at least one wear-resistant structure, which is located between the shaft center and the first magnetic structure, the shaft center and the second magnetic structure. One of the groups formed between the axis and the first magnetic structure and the second magnetic structure.

4. The bearingless motor according to claim 3, wherein the shaft center is in contact with the wear-resistant structure, and the contact method is point contact.

5. The bearingless motor according to claim 1, wherein: the bearingless motor The type is one selected from the group consisting of an axial fan motor, a centrifugal fan motor, an inner rotor motor, and an outer rotor motor.

6. The bearingless motor according to claim 1, wherein the magnetism of the portion of the first magnetic structure facing the second magnetic structure is the same as that of the portion of the second magnetic structure facing the first magnetic structure. Magnetically opposite.

7. The bearingless motor according to claim 1, further comprising: at least a third magnetic structure ring-shaped on the rotor structure, the third magnetic structure having a first magnetic center plane;

At least a stator magnetically conductive structure is ring-shaped on the stator structure, the position of the stator magnetically conductive structure corresponds to the third magnetic structure, and the stator magnetically conductive structure has a second magnetic force center plane;

The first magnetic force center plane is parallel, slightly higher or slightly lower than the second magnetic force center plane in the axial direction.

8. The bearingless motor according to claim 1, further comprising: when the stator structure is covered in the rotor structure, further comprising:

The axis extends into an opening in the center of the stator structure; and

A protective structure is located on the side wall of the opening and does not contact the axis.

9. The bearingless motor according to claim 8, wherein: the protective structure is one selected from the group consisting of plastic, elastic material, and shock-absorbing material.

10. The bearingless motor according to claim 1, wherein:

The surface shape of the end of the shaft center is one selected from the group consisting of a flat shape, an arc shape, a tapered shape, a concave surface, and a convex surface; and The shape of the surface of the end of the first magnetic structure or the second magnetic structure facing the axis is one selected from the group consisting of a planar shape, an arc shape, a tapered shape, a concave surface and a convex surface; When the shaft center and the first magnetic structure or the second magnetic structure are in point contact with each other, the end surface shape of the shaft center and the end surface shape of the first magnetic structure or the end surface shape of the second magnetic structure correspond to each other.

11. The bearingless motor according to claim 3, wherein:

The surface shape of the end of the shaft center is one selected from the group consisting of a flat shape, an arc shape, a tapered shape, a concave surface, and a convex surface; and

The shape of the surface of the end of the wear-resistant structure facing the axis is one selected from the group consisting of a flat shape, an arc shape, a tapered shape, a concave surface, and a convex surface;

Wherein, when the shaft center and the wear-resistant structure are in point contact with each other, the shape of the end face of the shaft center and the shape of the end face of the wear-resistant structure correspond to each other.

12. The bearingless motor according to claim 1, further comprising a plurality of fan blades surrounding the periphery of the rotor structure, wherein the fan blades are selected from the group consisting of centrifugal fan blades, flat fan blades, and axial flow. One of the ethnic groups of fan blades.

13. The bearingless motor according to claim 1, wherein the first magnetic structure and the second magnetic structure are one selected from the group consisting of a permanent magnet, a plastic magnet, and an electromagnet.

14. The bearingless motor according to claim 1, wherein: the casing is composed of an upper casing and a lower casing, and the upper casing and the lower casing are buckle structures corresponding to each other. The method for joining the upper case and the lower case is one selected from the group consisting of fitting, clamping, adhering, locking, and respectively fixing through a buffer structure.

15. The bearingless motor according to claim 1, wherein: the manner in which the first magnetic structure and the second magnetic structure are engaged with the housing is selected from the group consisting of bonding, fitting, clamping, and joining. One of the ethnic groups.

16. A bearingless motor suitable for a fan motor, characterized in that the motor includes:

A stator structure is located on the base of a casing, the stator structure has at least a stator magnetic permeability structure, the stator magnetic permeability structure is ring-shaped on the stator structure, and the stator magnetic permeability structure has a first magnetic force center Plane

A rotor structure is located on the base. The rotor structure has an axial center and at least one first magnetic structure. The axial center extends axially and protrudes from the rotor structure. The first magnetic structure is annularly arranged on the rotor structure. And the position of the first magnetic structure corresponds to the stator magnetic conductive structure, the first magnetic structure has a second magnetic force center plane;

A plurality of fan blades surrounding the periphery of the rotor structure;

A second magnetic structure is fixed on the housing, the second magnetic structure fixes the shaft center by magnetic attraction, and the second magnetic structure contacts the shaft center in a point contact manner;

The second magnetic force center plane is slightly higher or slightly lower than the first magnetic force center plane, and the second magnetic structure and the shaft center share an axis.

17. The bearingless motor according to claim 16, wherein:

When the second magnetic structure is fixed to the base, the second magnetic force center plane is slightly higher than the first magnetic force center plane in the axial direction; and

When the second magnetic structure is fixed on the top of the casing, the second magnetic force center plane is slightly lower than the first magnetic force center plane in the axial direction.

1 8. The bearingless motor according to claim 17, wherein: the shaft center is in contact with the second magnetic structure, and the contact method is point contact.

19. The bearingless motor according to claim 17, further comprising at least one first wear-resistant structure located between the shaft center and the second magnetic structure.

20. The bearingless motor according to claim 19, wherein the shaft center is in contact with the first wear-resistant structure, and the contact method is point contact.

21. The bearingless motor according to claim 17, comprising: at least one second wear-resistant structure located on the housing, and corresponding to the other end portion of the shaft center far from the second magnetic structure. The shaft center and the second wear-resistant structure are in point contact with each other.

22. The bearingless motor according to claim 16, wherein the type of the fan motor is one selected from the group consisting of an axial fan motor, a centrifugal fan motor, and a frameless fan motor.

2 3. The bearingless motor according to claim 17, further comprising: the shaft center extending into an opening in the center of the stator structure; and

24. The bearingless motor according to claim 23, wherein the protective structure is one selected from the group consisting of plastic, elastic material, and shock-absorbing material.

25. The bearingless motor according to claim 16, wherein:

The surface shape of the end of the shaft center is one selected from the group consisting of a planar shape, an arc shape, a tapered shape, a concave surface, and a convex surface;

The shape of the surface of the end of the second magnetic structure facing the axis is one selected from the group consisting of a planar shape, an arc shape, a tapered shape, a concave surface, and a convex surface; When the shaft center and the second magnetic structure are in point contact with each other, the shape of the end surface of the shaft center and the shape of the end surface of the second magnetic structure correspond to each other.

26. The bearingless motor according to claim 19 or 21, characterized in that: the surface shape of the shaft end is selected from the group consisting of a flat shape, an arc shape, a tapered shape, a concave surface and a convex surface One; and

The surface shape of one of the groups consisting of the first wear-resistant structure and the second wear-resistant structure facing the axis is selected from the group consisting of a flat shape, an arc shape, a tapered shape, a concavely curved surface, and an outer shape. One of the groups of convex surfaces;

Wherein, when the shaft center is in point contact with one of the groups consisting of the first wear-resistant structure and the second wear-resistant structure, the shape of the end face of the shaft center and the The shape of the end faces of one of the groups of grinding structures corresponds to each other.

27. The bearingless motor according to claim 16, wherein the fan blade is one of a group selected from a centrifugal fan blade, a flat fan blade, and an axial fan blade.

28. The bearingless motor according to claim 16, wherein the second magnetic structure is one selected from the group consisting of a permanent magnet, a plastic magnet, and an electromagnet.

29. The bearingless motor according to claim 16, wherein: the casing is composed of an upper casing and a lower casing, and the upper casing and the lower casing are buckle combinations corresponding to each other The method for joining the upper case and the lower case is one selected from the group consisting of fitting, clamping, adhering, locking, and respectively fixing through a buffer structure.

30. The bearingless motor according to claim 16, wherein: the manner in which the second magnetic structure is combined with the housing is one selected from the group consisting of bonding, mating, clamping, and joining.

31. The bearingless motor according to claim 16, wherein: the joint between the shaft center and the second magnetic structure is higher than, lower than, or parallel to the second magnetic force center plane or the first magnetic force Center plane.

32. The bearingless motor according to claim 16, further comprising: a third magnetic structure located on top of a stator fixing seat of the stator structure; and a fourth magnetic structure located on a casing of the rotor structure. Physically

The third magnetic structure and the fourth magnetic structure are attracted to each other and are not in contact with each other.

3 3. The bearingless motor according to claim 32, wherein:

The type of the third magnetic structure is one selected from the group consisting of a ring shape, a fan shape, a block shape, and a strip shape, and the manner in which the third magnetic structure is combined with the stator fixing seat is selected from the group consisting of bonding and fitting One of the ethnic groups consisting of

The type and position of the fourth magnetic self-structure correspond to the third magnetic structure, and the manner in which the fourth magnetic structure is joined to the casing is selected from the group consisting of bonding, fitting, clamping, and joining. one.