A five-degree-of-freedom magnetic levitation motor without thrust plate

Abstract

The present invention discloses a five-degree-of-freedom magnetic suspension motor without a thrust disk, comprising a rotating shaft, a two-degree-of-freedom radial suspension component that generates radial suspension force and whose rotor core is coaxially assembled with the rotating shaft, a one-degree-of-freedom axial suspension component that generates axial suspension force and whose rotor core is coaxially assembled with the rotating shaft, a two-degree-of-freedom radial suspension bearingless motor component that generates radial suspension force and can drive the rotating shaft to rotate, and an external stator yoke that surrounds and supports the two-degree-of-freedom radial suspension component, the one-degree-of-freedom axial suspension component, and the two-degree-of-freedom radial suspension bearingless motor component, wherein the annular permanent magnets of the two-degree-of-freedom radial suspension component and the annular permanent magnets of the one-degree-of-freedom axial suspension component have opposite radial magnetization directions to form a permanent magnetic bias magnetic field. The present invention no longer needs to generate an axial suspension force to achieve axial suspension of the rotor by configuring an axial thrust disk, thereby improving the critical speed and overall disassembly and assembly efficiency of the five-degree-of-freedom magnetic suspension motor.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension motors, in particular to a five-degree-of-freedom magnetic suspension motor without a thrust plate. Background Art

[0002] The magnetic levitation motor uses electromagnetic force to achieve radial and axial five-degree-of-freedom support of the motor rotor, and thus has the characteristics of non-contact and frictionless operation. It has broad application potential in the fields of high-speed spindle motors, high-speed flywheel energy storage motors, and high-speed air compression motors.

[0003] However, when traditional magnetic levitation motors realize the five-degree-of-freedom suspension of the rotor, the generation of axial degree-of-freedom suspension force often requires the configuration of an axial thrust plate. The introduction of the thrust plate leads to the following problems for the whole machine system: 1. The critical speed is reduced, limiting the increase in the speed of the whole machine; 2. The existence of the axial thrust plate complicates the assembly process of the whole machine and reduces the efficiency of disassembly and assembly of the whole machine. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or problems existing in existing magnetic levitation motors, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a five-degree-of-freedom magnetic levitation motor without a thrust plate, thereby increasing the critical speed and improving the overall disassembly and assembly efficiency.

[0007] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A five-degree-of-freedom magnetic levitation motor without a thrust plate, comprising:

[0009] Rotating shaft;

[0010] A two-degree-of-freedom radial suspension assembly that generates radial suspension force and whose rotor core is coaxially assembled with the rotating shaft;

[0011] A one-degree-of-freedom axial suspension assembly that generates an axial suspension force and whose rotor core is coaxially assembled with the rotating shaft;

[0012] A two-degree-of-freedom radial suspension bearingless motor assembly that generates a radial suspension force and can drive the rotating shaft to rotate; and

[0013] An outer stator yoke that surrounds and supports the two-degree-of-freedom radial suspension assembly, the one-degree-of-freedom axial suspension assembly, and the two-degree-of-freedom radial suspension bearingless motor assembly;

[0014] The annular permanent magnet of the two-degree-of-freedom radial suspension component and the annular permanent magnet of the one-degree-of-freedom axial suspension component have opposite radial magnetization directions to form a permanent magnetic bias magnetic field.

[0015] As a preferred solution of the five-degree-of-freedom magnetic suspension motor without thrust disk described in the present invention, the two-degree-of-freedom radial suspension component further includes:

[0016] A radial suspension assembly stator core disposed in the inner ring of the annular permanent magnet of the two-degree-of-freedom radial suspension assembly; and

[0017] A radial suspension component winding wound on the radial suspension component stator core;

[0018] A radial suspension component air gap is formed between the tooth poles of the stator core of the radial suspension component and the rotor core of the radial suspension component, and the radial suspension component winding is divided into a first radial suspension component winding arranged along the X direction and symmetrical to each other and a second radial suspension component winding arranged along the Y direction and symmetrical to each other.

[0019] As a preferred solution of the five-degree-of-freedom magnetic levitation motor without thrust plate described in the present invention, the two-degree-of-freedom radial suspension component also includes a radial suspension component permanent magnet sheath, and the radial suspension component permanent magnet sheath is annularly distributed between the external stator yoke and the annular permanent magnet of the two-degree-of-freedom radial suspension component.

[0020] As a preferred solution of the five-degree-of-freedom magnetic suspension motor without thrust disk described in the present invention, the one-degree-of-freedom axial suspension component further includes:

[0021] An axial suspension component stator core disposed in the inner ring of the annular permanent magnet of the one-degree-of-freedom radial suspension component;

[0022] A winding support frame fixed to the inner ring of the stator core of the axial suspension assembly and forming a winding accommodating cavity with the inner ring of the stator core of the axial suspension assembly;

[0023] An axial suspension assembly winding annularly distributed in the winding accommodating cavity; and

[0024] A suspension assembly stator core cover plate disposed on the side wall of the suspension assembly stator core and enclosing the winding support frame and the axial suspension assembly winding within the inner ring of the axial suspension assembly stator core;

[0025] There is an axial suspension component air gap between the axial suspension component winding and the rotor core of the one-degree-of-freedom radial suspension component.

[0026] As a preferred solution of the five-degree-of-freedom magnetic levitation motor without thrust plate described in the present invention, the one-degree-of-freedom axial suspension component also includes an axial suspension component permanent magnet sheath, and the axial suspension component permanent magnet sheath is annularly distributed between the external stator yoke and the annular permanent magnet of the one-degree-of-freedom axial suspension component.

[0027] As a preferred solution of the five-degree-of-freedom magnetic levitation motor without thrust disk described in the present invention, the two-degree-of-freedom radial suspension bearingless motor assembly further includes:

[0028] A magnetic isolation ring of a bearingless motor assembly disposed on the inner ring of the outer stator yoke;

[0029] A stator core of a bearingless motor assembly disposed on an inner ring of a magnetic isolation ring of the bearingless motor assembly;

[0030] A bearingless motor assembly winding wound around the stator core of the bearingless motor assembly; and

[0031] A bearingless motor assembly rotor is disposed on the rotating shaft.

[0032] As a preferred solution of the five-degree-of-freedom magnetic levitation motor without thrust disk described in the present invention, the external stator yoke is annular and made of a high-magnetic-permeability solid alloy material.

[0033] Compared with the prior art, the present invention has the following beneficial effects: a radial suspension magnetic field generated by a two-degree-of-freedom radial suspension component and an axial suspension magnetic field generated by a one-degree-of-freedom axial suspension component, and the annular permanent magnets of the two-degree-of-freedom radial suspension component and the annular permanent magnets of the one-degree-of-freedom axial suspension component have opposite radial magnetization directions, forming a permanent magnetic bias magnetic field. The permanent magnetic bias magnetic field and the radial suspension magnetic field are mutually modulated in the air gap of the radial suspension component to break the balance of the magnetic field in the air gap of the radial suspension component to form a radial suspension force, which is applied to the rotor core of the two-degree-of-freedom radial suspension component, thereby allowing the shaft to be radially suspended when it rotates. The permanent magnetic bias magnetic field and the axial suspension magnetic field are mutually modulated in the air gap of the axial suspension component to form a suspension axial force based on the Lorentz force principle, which is applied to the rotor core of the one-degree-of-freedom axial suspension component, thereby allowing the shaft to rotate without the need for an axial thrust disk to realize the axial suspension of the rotor. Compared with traditional magnetic suspension motors, the present invention can increase the critical speed and improve the overall disassembly and assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0035] Figure 1 It is a schematic diagram of the axial structure of an embodiment of a five-degree-of-freedom magnetic levitation motor without a thrust plate according to the present invention;

[0036] Figure 2 A five-degree-of-freedom magnetic suspension motor without a thrust plate according to the present invention Figure 1 Schematic diagram of the two-degree-of-freedom radial suspension component structure;

[0037] Figure 3 A five-degree-of-freedom magnetic suspension motor without a thrust plate according to the present invention Figure 1 Schematic diagram of the structure of a two-degree-of-freedom radial suspension bearingless motor assembly;

[0038] Figure 4 A five-degree-of-freedom magnetic suspension motor without a thrust plate according to the present invention Figure 1 Schematic diagram of the one-degree-of-freedom axial suspension component structure;

[0039] Figure 5 A five-degree-of-freedom magnetic suspension motor without a thrust plate according to the present invention Figure 4 Schematic diagram of the partial structure of the one-degree-of-freedom axial suspension component. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0043] The present invention provides a five-degree-of-freedom magnetic suspension motor without a thrust plate, which can increase the critical speed and improve the overall disassembly and assembly efficiency.

[0044] Figure 1 The figure shows the overall structure of an embodiment of a five-degree-of-freedom magnetic levitation motor without a thrust plate according to the present invention. Figure 1 In this embodiment, a five-degree-of-freedom magnetic levitation motor without a thrust plate is provided, and its main parts include: an external stator yoke 1, a two-degree-of-freedom radial suspension component 2, a two-degree-of-freedom radial suspension bearingless motor component 3, a one-degree-of-freedom axial suspension component 4 and a rotating shaft 5.

[0045] The external stator yoke 1 is annular and made of a high-magnetic-permeability solid alloy material. It surrounds and supports the outside of the two-degree-of-freedom radial suspension component 2, the one-degree-of-freedom axial suspension component 3 and the two-degree-of-freedom radial suspension bearingless motor component 4, serving as a magnetic path for the permanent magnet bias magnetic field 6 along the Z-axis direction in space, and at the same time serving as a mechanical support structure for the stator part of the two-degree-of-freedom radial suspension component 2, the stator part of the two-degree-of-freedom radial suspension bearingless motor component 3 and the stator part of the one-degree-of-freedom axial suspension component 4.

[0046] Please also read Figure 2The two-degree-of-freedom radial suspension component 2 is composed of a radial suspension component permanent magnet sheath 21, a radial suspension component permanent magnet 22, a radial suspension component stator core 23, a radial suspension component winding and a radial suspension component rotor core 25. The radial suspension component winding is divided into a first radial suspension component winding 24x arranged along the X direction and symmetrical to each other and a second radial suspension component winding 24y arranged along the Y direction and symmetrical to each other. The radial suspension component stator core 23 is arranged in the inner ring of the radial suspension permanent magnet 22. The radial suspension component permanent magnet sheath 21 is annularly distributed between the outer stator yoke 1 and the radial suspension permanent magnet 22. The radial suspension component winding is wound on the radial suspension component stator core 23, the radial suspension component rotor core 25 is arranged in the radial suspension component stator core 23, and a radial suspension component air gap 26 is formed between the radial suspension component rotor core 25 and the radial suspension component stator core 23. The radial suspension component permanent magnet sheath 21 is used to prevent the radial suspension component permanent magnet 22 from being directly fitted with the external stator yoke 1 by interference fit, which may cause damage to the material of the radial suspension component permanent magnet 22. The radial suspension component permanent magnet 22 is an annular structure and is made of high-performance rare earth permanent magnet material, and is used as a magnetic source of the permanent magnetic bias magnetic field 6. The radial suspension component stator core 23 is made of high-performance silicon steel sheets stacked together, and is used as a part of the stator magnetic path of the permanent magnetic bias magnetic field 6 and the radial suspension magnetic field 27. The first radial suspension component winding 24x is connected in series with each other in a manner of generating a single-pole radial magnetic field and leads to two winding terminals. The second radial suspension component winding 24y is connected in series with each other in a manner of generating a single-pole radial magnetic field and leads to two winding terminals. When the terminals of the first radial suspension component winding 24x and the second radial suspension component winding 24y are energized, the first radial suspension component winding 24x and the second radial suspension component winding 24y generate a radial suspension magnetic field 27. The radial suspension assembly rotor core 25 serves as a part of the rotor magnetic flux path of the permanent magnet bias magnetic field 6 and the radial suspension magnetic field 27 .

[0047] Please also read Figure 3 The two-degree-of-freedom radially suspended bearingless motor assembly 3 includes a bearingless motor assembly magnetic isolation ring 31, a bearingless motor assembly stator core 32, a bearingless motor assembly winding 33 and a bearingless motor assembly rotor core 34. The bearingless motor assembly magnetic isolation ring 31 is arranged on the inner ring of the external stator yoke 1, and the bearingless motor assembly stator core 32 is arranged on the inner ring of the bearingless motor assembly magnetic isolation ring 31. The bearingless motor assembly winding 33 is wound on the bearingless motor assembly stator core 32. The bearingless motor assembly magnetic isolation ring 31, which is arranged on the inner ring of the bearingless motor assembly stator core 32 and is concentrically assembled with the rotating shaft 5, is made of a non-magnetic alloy material and is interference-assembled with the external stator yoke 1 to prevent the permanent magnet bias magnetic field 6 from passing through the two-degree-of-freedom radially suspended bearingless motor assembly 3 and closing.

[0048] Please also read Figure 4 and Figure 5 The one-degree-of-freedom axial suspension component 4 includes an axial suspension component permanent magnet sheath 41, an axial suspension component permanent magnet 42, an axial suspension component stator core 43, an axial suspension component winding 44, an axial suspension component rotor core 45, a winding support frame 46 and an axial suspension component stator core cover plate 47. The axial suspension component permanent magnet sheath 41 is annularly distributed between the external stator 1 yoke and the axis suspension component permanent magnet 42. The axial suspension component stator core is arranged in the inner ring of the axis suspension component permanent magnet 42. The axial suspension component stator core 43 is arranged in the inner ring of the axis suspension component permanent magnet 42. The winding support frame 46 is fixed to the inner ring of the axial suspension component stator core 43, and forms a winding accommodating cavity with the inner ring 43 of the axial suspension component stator core. The axial suspension component winding 44 is distributed in an annular manner in the winding accommodating cavity, and the axial suspension component stator core cover plate 47 is arranged on the side wall of the axial suspension component stator core 43, and the winding support frame 46 and the axial suspension component winding 44 are enclosed in the inner ring of the axial suspension component stator core 43. An axial suspension component air gap 46 is provided between the axial suspension component winding 44 and the axial suspension component rotor core 45. The axial suspension component permanent magnet sheath 41 is used to prevent the axial suspension component permanent magnet 42 from being directly fitted with the external stator yoke 1 by interference fit, which causes damage to the material of the axial suspension component permanent magnet 42. The axial suspension component permanent magnet 42 is an annular structure made of high-performance rare earth permanent magnet material, and is used as a magnetic source of the permanent magnetic bias magnetic field 6. The permanent magnetic bias magnetic field 6 is specifically established by the radial suspension component permanent magnet 22 and the axial suspension component permanent magnet 42, and the magnetization directions of the radial suspension component permanent magnet 22 and the axial suspension component permanent magnet 42 are opposite. The stator core 43 of the axial suspension assembly is made of high-performance silicon steel sheets, and serves as a part of the stator magnetic path of the permanent magnetic bias magnetic field 6. The axial suspension assembly winding 44 is wound into a ring shape by enameled wire, and serves as a magnetic source for generating the axial suspension magnetic field. The axial suspension assembly rotor 45 serves as a part of the rotor magnetic path of the permanent magnetic bias magnetic field 6.

[0049] Combination Figure 1-Figure 5, the specific use process of a five-degree-of-freedom magnetic suspension motor without a thrust disk in this embodiment is as follows: the connection terminals of the first radial suspension component winding 24x and the second radial suspension component winding 24y are energized, and a radial suspension magnetic field is formed at this time. The radial suspension magnetic field 27 and the permanent magnetic bias magnetic field 6 are mutually modulated in the radial suspension component air gap 26 to break the balance of the magnetic field of the radial suspension component air gap 26, thereby generating a radial suspension force, ensuring the radial suspension balance of the radial suspension component rotor core 25, and thereby maintaining the radial suspension balance of the shaft 5. The axial suspension component winding 44 is energized, and at this time, an axial suspension magnetic field is formed, and the axial suspension magnetic field and the permanent magnetic bias magnetic field 6 are mutually modulated in the axial suspension component air gap, and according to the Lorentz force principle, an axial suspension force is generated, so that the axial suspension component rotor core 45 is axially balanced and suspended, thereby maintaining the axial suspension balance of the shaft 5. The present invention no longer needs to configure an axial thrust disk to achieve axial suspension of the rotor, thereby improving the critical speed and overall disassembly and assembly efficiency of the five-degree-of-freedom magnetic suspension motor.

[0050] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A five-degree-of-freedom magnetic levitation motor without a thrust plate, characterized in that: include: Rotating shaft; A two-degree-of-freedom radial suspension assembly that generates radial suspension force and whose rotor core is coaxially assembled with the rotating shaft; A one-degree-of-freedom axial suspension assembly that generates an axial suspension force and whose rotor core is coaxially assembled with the rotating shaft; A two-degree-of-freedom radial suspension bearingless motor assembly that generates a radial suspension force and can drive the rotating shaft to rotate; as well as An outer stator yoke that surrounds and supports the two-degree-of-freedom radial suspension assembly, the one-degree-of-freedom axial suspension assembly, and the two-degree-of-freedom radial suspension bearingless motor assembly; The annular permanent magnet of the two-degree-of-freedom radial suspension component and the annular permanent magnet of the one-degree-of-freedom axial suspension component have opposite radial magnetization directions, forming a permanent magnetic bias magnetic field; The two-degree-of-freedom radial suspension assembly also includes: A radial suspension assembly stator core disposed in the inner ring of the annular permanent magnet of the two-degree-of-freedom radial suspension assembly; and A radial suspension component winding wound on the radial suspension component stator core; Wherein, a radial suspension component air gap is formed between the tooth poles of the stator core of the radial suspension component and the rotor core of the radial suspension component, and the radial suspension component winding is divided into a first radial suspension component winding arranged along the X direction and symmetrical to each other and a second radial suspension component winding arranged along the Y direction and symmetrical to each other; The one-degree-of-freedom axial suspension assembly also includes: An axial suspension component stator core disposed in the inner ring of the annular permanent magnet of the one-degree-of-freedom radial suspension component; A winding support frame fixed to the inner ring of the stator core of the axial suspension assembly and forming a winding accommodating cavity with the inner ring of the stator core of the axial suspension assembly; An axial suspension assembly winding annularly distributed in the winding accommodating cavity; and An axial suspension component stator core cover plate disposed on the side wall of the axial suspension component stator core and enclosing the winding support frame and the axial suspension component winding within the inner ring of the axial suspension component stator core; Wherein, there is an axial suspension component air gap between the axial suspension component winding and the rotor core of the one-degree-of-freedom radial suspension component; The two-degree-of-freedom radial suspension bearingless motor assembly comprises: A magnetic isolation ring of a bearingless motor assembly disposed on the inner ring of the outer stator yoke; A stator core of a bearingless motor assembly disposed on an inner ring of a magnetic isolation ring of the bearingless motor assembly; A bearingless motor assembly winding wound around the stator core of the bearingless motor assembly; and A bearingless motor assembly rotor is disposed on the rotating shaft.

2. The five-degree-of-freedom magnetic levitation motor without thrust disk according to claim 1, characterized in that: The two-degree-of-freedom radial suspension component further comprises a radial suspension component permanent magnet sheath, and the radial suspension component permanent magnet sheath is annularly distributed between the outer stator yoke and the annular permanent magnet of the two-degree-of-freedom radial suspension component.

3. The five-degree-of-freedom magnetic levitation motor without thrust disk according to claim 1, characterized in that: The one-degree-of-freedom axial suspension component further comprises an axial suspension component permanent magnet sheath, wherein the axial suspension component permanent magnet sheath is annularly distributed between the external stator yoke and the annular permanent magnet of the one-degree-of-freedom axial suspension component.

4. The five-degree-of-freedom magnetic levitation motor without thrust disk according to claim 1, characterized in that: The outer stator yoke is annular and made of a solid alloy material with high magnetic conductivity.

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