Magnetic levitation motor

Abstract

A magnetic levitation motor, which comprises a vacuum housing, a rotating shaft, a motor rotor, a motor stator, a magnetic bearing and a cooling unit. A chamber is formed in the rotating shaft and a liquid spraying hole is formed in the upper portion of the rotating shaft, the rotating shaft being rotationally arranged in the vacuum housing. A liquid medium is stored at the bottom portion of the inside of the vacuum housing. The end of the rotating shaft extending into the liquid medium is connected to a rotating body to draw the liquid medium into the chamber; the liquid medium is sprayed out to the inner wall of the housing through the liquid spraying hole; heat generated by the rotor is conducted to the vacuum housing via the liquid medium; a cooling water channel is provided in a wall body of the vacuum housing; and the cooling unit is communicated with the cooling water channel and is used for cooling the vacuum housing. Compared with the prior art, the magnetic levitation motor of the present invention has the advantages of a simple structure, a reliable heat exchange mode, high heat dissipation efficiency, etc., and can effectively solve the heat dissipation problem of motor rotors in vacuum environments.

Description

A magnetic levitation motor Technical Field

[0001] The present invention relates to the technical field of magnetic levitation motor rotor heat dissipation, and in particular to a magnetic levitation motor. Background Art

[0002] Compared with traditional motors that use rolling bearings and sliding bearings, magnetic levitation motors use electromagnetic force to achieve contactless support of the rotor. Since there is no physical contact, the rotor can reach a very high speed and has the advantages of low mechanical wear, low energy consumption, low noise, and long life. It is particularly suitable for special environments such as high speed and vacuum, and is widely used in spacecraft stability control, flywheel energy storage, centrifugal compressors and other fields.

[0003] During operation, the rotors of a magnetic levitation motor and its magnetic bearings generate heat. Relying solely on natural cooling can easily lead to overheating of the rotors. This is especially true with the advancement of magnetic levitation motor technology, where motor speeds have gradually increased. To reduce rotor wind friction losses, magnetic levitation motors are typically vacuumed internally. However, this high vacuum environment blocks the rotor's heat dissipation channels, making it difficult for the heat generated by the rotors to be dissipated through convection or radiation. Furthermore, as the power of magnetic levitation motors increases, the heat generated by the motors and magnetic bearing rotors gradually increases. If the motor or magnetic bearing rotors are not properly cooled, performance degradation or even demagnetization due to high temperatures can occur. Therefore, rotor heat dissipation in a vacuum environment has become a key factor restricting the development of magnetic levitation motor technology.

[0004] Existing solutions for dissipating heat from magnetic levitation motor rotors in vacuum conditions primarily rely on circulating a gas-liquid phase-change cooling medium within a hollow shaft between the cooling and heating ends to absorb and release rotor heat. This heat dissipation solution requires complex phase-change cooling medium sealing technologies (such as magnetic fluid seals) to prevent leakage of the phase-change cooling medium into the vacuum chamber. Alternatively, existing solutions utilize the circulation of coolant within a hollow shaft to cool the rotor. However, this rotor heat dissipation solution has a small contact area between the coolant and the shaft, resulting in low heat dissipation efficiency and unsuitable for high-power magnetic levitation motor rotors.

[0005] Due to the difficulty in dissipating heat from the magnetic levitation motor rotor in a vacuum environment, the magnets can easily lose their magnetism due to high temperatures, limiting the power increase of the magnetic levitation motor. Therefore, how to provide a magnetic levitation motor that can better dissipate heat from the magnetic levitation motor rotor is an urgent problem to be solved in this field.

[0006] Summary of the Invention

[0007] In response to the above technical problems, the present invention provides a magnetic levitation motor with a simple structure, high reliability and high heat dissipation efficiency, which can effectively solve the heat dissipation problem of the magnetic levitation motor rotor in a vacuum environment.

[0008] A magnetic levitation motor comprises a vacuum housing, a rotating shaft, a motor rotor, a motor stator, a magnetic bearing, and a cooling unit;

[0009] The rotating shaft is rotatably disposed in the vacuum housing, and the motor rotor is fixed on the rotating shaft;

[0010] The motor stator is fixed on the vacuum housing;

[0011] A liquid storage tank is provided at the bottom of the vacuum housing, and liquid medium is stored in the liquid storage tank;

[0012] A hollow channel is formed in the rotating shaft, and a spray hole is formed on the upper part of the rotating shaft. One end of the rotating shaft extending into the liquid medium is connected to the rotating body to draw the liquid medium into the hollow channel, and the liquid medium is sprayed onto the inner wall of the shell through the spray hole and returned to the liquid storage tank; a cooling water channel is opened on the wall of the vacuum shell; the cooling unit is connected to the cooling water channel to cool the vacuum shell; and the magnetic bearing is arranged in the vacuum shell.

[0013] Preferably, the magnetic bearing includes a radial magnetic bearing, which is located in the vacuum shell. Two radial magnetic bearings are provided, which are located on both sides of the axial direction of the motor, and the rotor of the radial magnetic bearing is fixed on the rotating shaft, and the stator of the radial magnetic bearing is fixed on the vacuum shell.

[0014] Preferably, the magnetic bearing further comprises a thrust magnetic bearing located in the vacuum housing, a rotor of the thrust magnetic bearing is fixed on the rotating shaft, and a stator of the thrust magnetic bearing is fixed on the vacuum housing.

[0015] Preferably, it further comprises protective bearings located at both ends of the rotating shaft, wherein the protective bearings are rotatably mounted between the rotating shaft and the vacuum housing to support the motor rotor in a stationary or unstable state.

[0016] Preferably, the rotating body is fixed to the bottom of the rotating shaft and immersed in the liquid medium; the rotating body is provided with an extraction groove connected to the hollow channel.

[0017] Preferably, the extraction groove includes a spiral groove and a communicating hole;

[0018] There are two spiral grooves, which are centrally symmetrical and spirally arranged on the rotating body;

[0019] The communicating holes are arranged along the axial direction and are communicated with the spiral groove and the hollow channel respectively.

[0020] Preferably, the rotating body is conical.

[0021] Preferably, a plurality of semicircular grooves are provided on the inner wall of the vacuum housing and run through the inner wall of the vacuum housing, and the semicircular grooves are assembled with the magnetic bearing stator and the motor stator to form an oil return channel.

[0022] Preferably, the cooling water channel is arranged in a spiral shape.

[0023] Preferably, the opening area of ​​the cooling water channel corresponds to the spray hole and extends to the liquid storage tank.

[0024] Compared with the prior art, the magnetic levitation motor provided by the present invention includes a vacuum shell, a rotating shaft, a motor rotor, a motor stator, a magnetic bearing, and a cooling unit; the rotating shaft is rotatably arranged in the vacuum shell, the motor rotor is fixed on the rotating shaft, and the motor stator is fixed on the vacuum shell; a liquid storage tank is provided at the bottom of the vacuum shell, and a liquid medium is stored in the liquid storage tank; a hollow channel is formed in the rotating shaft, and a spray hole is formed on the upper part of the rotating shaft; one end of the rotating shaft extending into the liquid medium is connected to a rotating body to draw the liquid medium into the hollow channel, and the liquid medium is sprayed out to the inner wall of the shell through the spray hole and returned to the liquid storage tank; a cooling water channel is opened on the wall of the vacuum shell; the cooling unit is connected to the cooling water channel to cool the vacuum shell; the magnetic bearing is arranged in the vacuum shell. When the magnetic levitation motor rotates via the rotating shaft, the rotating body draws the liquid medium into the hollow channel and ejects it outward through a liquid spray hole at the upper end of the rotating shaft. Under the action of gravity, the liquid medium can flow back into the liquid reservoir, forming a cycle. The circulation of the liquid medium between the rotating shaft and the vacuum housing transfers heat generated by the rotor to the vacuum housing, achieving an internal cooling cycle. The circulation of the coolant between the vacuum housing and the cooling unit creates an external cooling cycle. Through the combined action of the internal and external cooling cycles, heat generated by the magnetic levitation motor and magnetic bearing rotor is transferred to the exterior of the vacuum housing, effectively cooling the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] FIG1 is a schematic structural diagram of a magnetic levitation motor provided by an embodiment;

[0027] FIG2 is a top view of the rotating body shown in FIG1 ;

[0028] FIG3 is a cross-sectional view of the rotating body shown in FIG1 ;

[0029] FIG4 is a schematic structural diagram of some components of the magnetic levitation motor shown in FIG1 . DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0031] It should be noted that when a component is referred to as being “fixed on”, “mounted on” or “set on” another component, it can be directly on the other component or indirectly set on the other component; when a component is “connected” to another component, or a component is referred to as being “connected to” another component, it can be directly connected to the other component or indirectly connected to the other component.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0035] The magnetic levitation motor provided by the present invention includes a vacuum housing, a rotating shaft, a motor rotor, a motor stator, a magnetic bearing, and a cooling unit; the rotating shaft is rotatably arranged in the vacuum housing, the motor rotor is located in the vacuum housing and fixed on the rotating shaft; the motor stator is located in the vacuum housing and fixed on the vacuum housing, and is arranged corresponding to the motor rotor; a liquid storage tank is provided at the bottom of the vacuum housing, and a liquid medium is stored in the liquid storage tank; a hollow channel is opened in the interior of the rotating shaft along the axial direction, and the top of the rotating shaft is closed; A liquid spray hole is provided at the upper end of the rotating shaft, which radially penetrates the rotating shaft and communicates with the hollow channel. A rotating body is connected to the bottom of the rotating shaft, which is immersed in the liquid medium, to draw the liquid medium into the hollow channel and spray the liquid medium onto the inner wall of the vacuum shell through the liquid spray hole. A cooling water channel is provided on the wall of the vacuum shell. The cooling unit is also provided outside the vacuum shell and communicates with the cooling water channel to inject coolant into the cooling water channel to cool the vacuum shell. When the magnetic levitation motor is operated by the rotating shaft, the rotating body draws the liquid medium into the hollow channel and sprays the liquid medium outward through the liquid spray hole provided at the upper end of the rotating shaft. Under the action of gravity, the liquid medium can flow back into the liquid reservoir to form a cycle. The heat generated by the rotor is transferred to the vacuum housing by the circulation of the liquid medium between the rotating shaft and the vacuum housing, thereby realizing an internal cooling cycle; the external cooling cycle is realized by the circulation of the coolant between the vacuum housing and the cooling unit; and the combined action of the internal cooling cycle and the external cooling cycle better improves the heat dissipation effect on the rotor.

[0036] Please refer to Figures 1 to 4 . This embodiment provides a magnetic levitation motor 100, which includes a vacuum housing 10, a rotating shaft 20, a motor rotor 30, a motor stator 40, a magnetic bearing 60, and a cooling unit 50. The rotating shaft 20 is rotatably disposed within the vacuum housing 10, the motor rotor 30 is located within the vacuum housing 10 and fixed to the rotating shaft 20, and the motor stator 40 is located within the vacuum housing 10 and fixed to the vacuum housing 10, with the motor stator 40 being disposed corresponding to the motor rotor 30.

[0037] A liquid reservoir is provided at the bottom of the vacuum shell 10, in which a liquid medium 11 is stored. A hollow channel 211 is provided axially inside the rotating shaft 20, and the top of the rotating shaft 20 is closed. A liquid spray hole 212 is provided at the upper portion of the rotating shaft 20 (the end near the top), which radially penetrates the rotating shaft 20 and communicates with the hollow channel 211. A rotating body 214 is connected to the end of the rotating shaft 20 that extends into the liquid medium to draw the liquid medium 11 into the hollow channel 211, and spray the liquid medium 11 onto the inner wall of the vacuum shell 10 through the liquid spray hole 212, and then return it to the liquid reservoir.

[0038] Because the rotating body 214 at the bottom of the rotating shaft 20 is immersed in the liquid medium 11, when the rotating shaft 20 rotates, the high-speed operation of the rotating body 214 creates a pumping effect, which pumps the liquid medium 11 from the bottom of the vacuum housing 10 to the top of the rotating shaft 20. The liquid medium 11 is then ejected onto the inner wall of the vacuum housing 10 through the liquid spray holes 212 provided on the rotating shaft 20. Under the action of gravity, the liquid medium 11 flows back to the bottom of the vacuum housing 10. Through the continuous pumping action of the rotating shaft 20, the liquid medium 11 circulates between the rotating shaft 20 and the vacuum housing 10. The motor rotor 30 transfers heat to the rotating shaft 20, which in turn transfers heat to the liquid medium 11. The liquid medium 11 then transfers heat to the vacuum housing 10, thereby achieving an internal cooling cycle.

[0039] The wall of the vacuum housing 10 is provided with a cooling water channel 12. The cooling unit 50 is in communication with the cooling water channel 12 for injecting coolant into the cooling water channel 12. The cooling unit 50 provides power to deliver the coolant into the cooling water channel 12. The cooling unit 50 circulates the coolant between the vacuum housing 10 and the cooling unit 50, thereby achieving an external cooling cycle and dissipating heat from the vacuum housing 10.

[0040] The magnetic bearing 60 is disposed in the vacuum housing 10 .

[0041] It is understandable that in the prior art, heat dissipation systems or methods for magnetic levitation motor rotors under vacuum conditions mainly include methods such as oil cooling in the shaft hole, phase change medium cooling, and extended surface enhanced radiation heat dissipation. Among them, oil cooling in the shaft hole mainly uses the circulation of coolant in the hollow shaft to cool the rotor. This rotor heat dissipation method has a small contact area between the coolant and the shaft, resulting in low heat dissipation efficiency and is not suitable for high-power magnetic levitation motor rotor heat dissipation. Phase change medium cooling mainly relies on the circulation of gas-liquid phase change cooling medium encapsulated in the hollow shaft between the cooling end and the heating end to absorb and release rotor heat. In this heat dissipation method, the phase change cooling medium easily leaks into the vacuum chamber, requiring complex phase change cooling medium sealing technology (such as magnetic fluid sealing). Due to the low radiation heat transfer efficiency in a high vacuum environment, the extended surface enhanced radiation heat dissipation method requires a larger area of ​​radiation heat exchange structure, resulting in increased shaft length and complex structure.

[0042] In the magnetic levitation motor 100 provided in this embodiment, the heat generated by the rotor in a vacuum environment is transferred to the vacuum housing 10 through the combined action of an internal cooling cycle and an external cooling cycle. The external cooling unit 50 then provides the coolant to cool the vacuum housing 10. This conduction of heat generated by the rotor in a vacuum environment to the exterior of the vacuum housing 10 effectively cools the rotor. This magnetic levitation motor 100 has the advantages of a simple structure, reliable heat exchange, and high heat dissipation efficiency, effectively resolving the heat dissipation challenge faced by the rotor in a vacuum environment.

[0043] Specifically, in one embodiment, the liquid medium 11 may be thermal oil.

[0044] Specifically, in one embodiment, the specific connection structure between the motor rotor 30 and the rotating shaft 20 is: the motor rotor 30 is assembled on the rotating shaft 20 by interference fit.

[0045] Preferably, in one embodiment, the magnetic bearing 60 includes a radial magnetic bearing 61, the radial magnetic bearing 61 is located in the vacuum housing 10, and the rotor of the radial magnetic bearing 61 is fixed to the rotating shaft 20, and the stator of the radial magnetic bearing 61 is fixed to the vacuum housing 10. Specifically, two radial magnetic bearings 61 are provided, and the two radial magnetic bearings 61 are respectively located on both sides of the axial direction of the motor (the motor rotor 30 and the motor stator 40 together constitute the motor).

[0046] Specifically, in one embodiment, the specific connection structure between the rotor of the radial magnetic bearing 61 and the rotating shaft 20 is: the rotor of the radial magnetic bearing 61 is assembled on the rotating shaft 20 by interference fit.

[0047] Preferably, in one embodiment, the magnetic bearing 60 further includes a thrust magnetic bearing 62 located in the vacuum housing 10 , the rotor of the thrust magnetic bearing 62 is fixed on the rotating shaft 20 , and the stator of the thrust magnetic bearing 62 is fixed on the vacuum housing 10 .

[0048] Specifically, in one embodiment, the specific connection structure between the rotor of the thrust magnetic bearing 62 and the rotating shaft 20 is: the rotor of the thrust magnetic bearing 62 is assembled on the rotating shaft 20 by interference fit.

[0049] Preferably, in one embodiment, the magnetic levitation motor 100 further includes a protective bearing 80 located within the vacuum housing 10. The protective bearing 80 is rotatably mounted between the rotating shaft 20 and the vacuum housing 10, and is used to support the motor rotor 30 in a stationary or unstable state. Specifically, two protective bearings 80 are provided, located at the upper and lower ends of the rotating shaft 20. Specifically, the height of the liquid medium 11 in the liquid reservoir does not exceed the protective bearing 80 located at the lower end.

[0050] Preferably, in one embodiment, the rotating body 214 is fixed to the bottom of the rotating shaft 20 and immersed in the liquid medium 11. The rotating body 214 is provided with a suction groove 2140 connected to the hollow channel 211. The suction groove 2140 is used to suck up the liquid medium 11 and deliver it into the hollow channel 211. When the rotating shaft 20 rotates, the rotating shaft 20 drives the rotating body 214 to rotate at high speed. The high-speed operation of the rotating body 214 creates a suction effect that delivers the liquid medium 11 into the hollow channel 211 through the suction groove 2140.

[0051] Preferably, in one embodiment, the rotating body 214 is conical. When the rotating body 214 rotates at a high speed, the liquid medium 11 forms a vortex, and the conical shape of the rotating body 214 can reduce the stirring friction between the rotating body 214 and the liquid medium 11.

[0052] Preferably, in one embodiment, the extraction groove 2140 includes a spiral groove 2141 and a connecting hole 2142. There are two spiral grooves 2141, and the two spiral grooves 2141 are centrally symmetrically spirally arranged on the rotating body 214. The connecting hole 2142 is arranged axially and is respectively connected with the spiral groove 2141 and the hollow channel 211. Through this structure, when the rotating body 214 rotates, the liquid medium 11 can be more smoothly extracted and sent into the hollow channel 211. Specifically, the spiral groove 2141 is opened on the surface of the rotating body 214 and extends axially, and the spiral groove 2141 is connected with the connecting hole 2142. More specifically, in one embodiment, a notch is milled on the surface of the rotating body 214, and the spiral groove 2141 is connected between the notch and the connecting hole 2142.

[0053] It should be noted that in one embodiment, the rotating body 214 is conical, and the extraction channel is the spiral groove 2141 formed on the conical surface. Of course, in other embodiments, the rotating body 214 may have other shapes, and the extraction channel may be multi-channel or have other shapes. It is sufficient that the rotation of the rotating shaft 20 can extract the liquid medium 11, achieving self-circulation and heat dissipation of the medium between the rotor and the vacuum housing 10.

[0054] Specifically, in one embodiment, the rotating body 214 is assembled to the bottom of the rotating shaft 20 by interference fit. More specifically, the rotating body 214 is assembled to the bottom of the rotating shaft 20 by interference fit with the stepped stop of the cylindrical boss.

[0055] Preferably, in one embodiment, a plurality of the liquid spray holes 212 are provided, and all the liquid spray holes 212 are circumferentially and evenly spaced on the rotating shaft 20 , that is, all the liquid spray holes 212 are circumferentially and evenly spaced on the rotating shaft 20 .

[0056] Preferably, in one embodiment, the inner wall of the vacuum housing 10 is provided with a plurality of semicircular grooves extending vertically therethrough. After the vacuum housing 10 is assembled with the stator of the magnetic bearing 60 and the motor stator 40, the semicircular grooves form an oil return channel 13. After the liquid medium 11 is ejected from the liquid spray hole 212 into the vacuum housing 10, gravity causes the liquid medium 11 to flow back into the liquid reservoir along the oil return channel 13.

[0057] Preferably, in one embodiment, the cooling water channel 12 is arranged in a spiral shape, so as to further improve the cooling effect of the coolant on the vacuum housing 10 .

[0058] Preferably, in one embodiment, the cooling water channel 12 is provided in an area corresponding to the liquid spray hole 212 and extending to the liquid reservoir. That is, the cooling water channel 12 extends from the upper end of the vacuum housing 10 to the bottom of the vacuum housing 10. This ensures that the flow area of ​​the coolant corresponds to the flow area of ​​the liquid medium 11 in the vacuum housing 10, further enhancing the cooling effect of the coolant on the vacuum housing 10.

[0059] Specifically, in one embodiment, the cooling unit 50 is connected to the cooling water channel 12 via a coolant pipe 51. The water inlet and outlet of the cooling water channel 12 may be provided at the top and bottom of the wall of the vacuum housing 10. The cooling unit 50 is connected to the water inlet and outlet of the cooling water channel 12 via the coolant pipe 51, respectively, so that the coolant circulates between the vacuum housing 10 and the cooling unit 50.

[0060] In one embodiment, the heat generated during operation by the motor rotor 30, the rotor of the radial magnetic bearing 61, and the rotor of the thrust magnetic bearing 62 is transferred to the rotating shaft 20. The rotation of the rotating shaft 20 draws and ejects the liquid medium 11, thereby transferring the heat of the rotating shaft 20 to the vacuum housing 10 through the liquid medium 11. The heat generated during operation by the motor stator 40, the stator of the radial magnetic bearing 61, and the stator of the thrust magnetic bearing 62 is directly transferred to the vacuum housing 10, which is then cooled by the coolant provided by the cooling unit 50. In this way, through the combined action of the internal cooling cycle and the external cooling cycle, the heat generated during operation of the magnetic levitation motor is transferred to the outside of the vacuum housing 10, achieving effective cooling of the rotor.

[0061] The magnetic levitation motor 100 forms an internal cooling cycle through motor operation and the cooling unit 50 provides water cooling. There is no need to add a large-area radiation heat exchange structure on the rotating shaft, and there is no need to use complex magnetic fluid sealing technology to specially seal the phase change cooling medium. The heat generated by the rotor can be transferred to the outside of the magnetic levitation motor. The heat dissipation structure is simple, the heat exchange method is reliable, and the heat dissipation efficiency is high. It is particularly suitable for solving the heat dissipation problem of the rotor of a high-power magnetic levitation motor in a vacuum environment.

[0062] When the magnetic levitation motor 100 is working, an external vacuum pump draws vacuum from the output shaft end side of the rotating shaft 20 and the vacuum housing 10 (i.e., the protective bearing 80 located on the upper side) to maintain the vacuum environment inside the vacuum housing 10.

[0063] The above description is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the creative concept of the present invention, but these improvements all fall within the scope of protection of the present invention.

Claims

1. A magnetic levitation motor, characterized in that, It includes a vacuum housing, a rotating shaft, a motor rotor, a motor stator, magnetic bearings, and a cooling unit; the rotating shaft is rotatably arranged in the vacuum housing, the motor rotor is fixed on the rotating shaft, and the motor stator is fixed on the vacuum housing; a liquid storage pool is arranged at the bottom in the vacuum housing, and a liquid medium is stored in the liquid storage pool; a hollow channel is formed in the rotating shaft, and liquid spraying holes are formed in the upper part of the rotating shaft; one end of the rotating shaft extending into the liquid medium is connected to a rotating body to draw the liquid medium into the hollow channel, and the liquid medium is sprayed out through the liquid spraying holes to the inner wall of the housing and then flows back to the liquid storage pool; cooling water channels are opened on the wall of the vacuum housing; the cooling unit is communicated with the cooling water channels to cool the vacuum housing; the magnetic bearings are arranged in the vacuum housing.

2. The magnetic levitation motor according to claim 1, characterized in that, The magnetic bearings include radial magnetic bearings. There are two radial magnetic bearings, which are respectively located on both axial sides of the motor, and the rotor of the radial magnetic bearing is fixed on the rotating shaft, and the stator of the radial magnetic bearing is fixed on the vacuum housing.

3. The magnetic levitation motor according to claim 2, characterized in that, The magnetic bearings further include a thrust magnetic bearing located in the vacuum housing. The rotor of the thrust magnetic bearing is fixed on the rotating shaft, and the stator of the thrust magnetic bearing is fixed on the vacuum housing.

4. The magnetic levitation motor according to claim 1, characterized in that, It further includes protection bearings located at both ends of the rotating shaft. The protection bearings are rotatably installed between the rotating shaft and the vacuum housing.

5. The magnetic levitation motor according to any one of claims 1 to 4, characterized in that, The rotating body is fixed at the bottom of the rotating shaft and is immersed in the liquid medium; the rotating body is provided with a suction groove communicated with the hollow channel.

6. The magnetic levitation motor according to claim 5, characterized in that, The rotating body is conical.

7. The magnetic levitation motor according to claim 5, wherein The suction groove includes a spiral groove and a communication hole; the number of the spiral grooves is two, and they are arranged in a centrally symmetric spiral shape on the rotating body; the communication holes are arranged axially and are respectively communicated with the spiral groove and the hollow channel.

8. The magnetic levitation motor according to claim 1, wherein, Multiple semi-circular grooves penetrating up and down are opened on the inner wall of the vacuum housing, and an oil return channel is formed after being assembled with the magnetic bearing stator and the motor stator.

9. The magnetic levitation motor according to claim 1, wherein The cooling water channels are arranged in a spiral shape, and the opening area of the cooling water channels corresponds to the liquid spraying holes and extends to the liquid storage pool.

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