Magnetic levitation motor and air conditioner

Abstract

The present application provides a magnetic levitation motor and an air conditioner. The magnetic levitation motor includes a housing, a rotor assembly (1), a stator assembly (2), a main shaft (3), a mounting bracket (4), a radial magnetic levitation bearing (5), and an axial bearing. The mounting bracket (4) is fixedly arranged on the housing, the radial magnetic levitation bearing (5) is fixedly mounted on the mounting bracket (4), the rotor assembly (1) is sleeved on the outer periphery of the radial magnetic levitation bearing (5), the stator assembly (2) is sleeved on the outer periphery of the rotor assembly (1), the main shaft (3) is arranged on the axial outer side of the rotor assembly (1) and is fixedly connected to the rotor assembly (1), the axial bearing is used for adjusting the axial position of the main shaft (3), and the radial magnetic levitation bearing (5) is used for adjusting the radial position of the rotor assembly (1). According to the magnetic levitation motor of the present application, the size of the whole motor in the axial direction can be reduced, so that it can be applied to special occasions such as narrow spaces, and the applicable range of the motor can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment, and particularly relates to a magnetic levitation motor and an air conditioner. Background Art

[0002] A magnetic levitation motor utilizes the electromagnetic force of a magnetic levitation bearing to suspend the motor rotor in the air, so that there is no mechanical contact and no mechanical friction between the motor rotor and the motor stator. It is a low-loss and high-performance bearing. While achieving a high rotational speed of the motor rotor, it also has the advantages of no mechanical wear, low energy consumption, low noise, long service life, no need for lubrication and sealing, and no oil pollution. The rotational speed of the magnetic levitation motor rotor is only limited by the tensile strength of the rotor material. Therefore, the circumferential speed of the magnetic levitation motor rotor can be very high, and it is increasingly widely used in high-speed equipment.

[0003] Generally, a magnetic levitation motor is equipped with 2 radial magnetic bearings and 1 pair of axial magnetic bearings, plus the motor stator and rotor, resulting in a relatively large size of the whole machine in the axial direction, which cannot be applied to special occasions with limited space, and its application range is restricted. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a magnetic levitation motor and an air conditioner, which can reduce the size of the whole motor in the axial direction, enable it to be applied to special occasions such as narrow spaces, and improve the application range of the motor.

[0005] To solve the above problems, the present application provides a magnetic levitation motor, which includes a housing, a rotor assembly, a stator assembly, a main shaft, a mounting frame, a radial magnetic levitation bearing, and an axial bearing. The mounting frame is fixedly arranged on the housing, the radial magnetic levitation bearing is fixedly installed on the mounting frame, the rotor assembly is sleeved on the outer periphery of the radial magnetic levitation bearing, the stator assembly is sleeved on the outer periphery of the rotor assembly, the main shaft is arranged on the axial outer side of the rotor assembly and is fixedly connected to the rotor assembly, the axial bearing is used to adjust the axial position of the main shaft, and the radial magnetic levitation bearing is used to adjust the radial position of the rotor assembly.

[0006] Preferably, the radial magnetic levitation bearing includes a radial iron core and a radial winding. The radial iron core is installed on the mounting frame, and the two axial end faces of the radial iron core are flush with the two axial end faces of the rotor assembly. The radial winding is wound axially on the radial iron core, and the radial winding is evenly distributed along the circumferential direction of the radial iron core.

[0007] Preferably, a first stop protrusion is provided on the mounting frame, and the first stop protrusion is used to define the axial mounting position of the radial magnetic levitation bearing on the mounting frame.

[0008] Preferably, the mounting frame includes a mounting shaft, the mounting shaft passes through the inner peripheral side of the radial magnetic levitation bearing, and one end of the mounting shaft is fixedly arranged on the housing.

[0009] Preferably, a convex block axially protruding away from the radial magnetic suspension bearing is provided on the housing, and an installation groove is provided on the back side of the convex block, and the installation shaft is installed in the installation groove.

[0010] Preferably, a thrust disc is fixedly provided at one end of the main shaft close to the rotor assembly, an axial connecting member extending toward the rotor assembly is fixedly provided on the outer peripheral side of the thrust disc away from the main shaft, and an end face connecting member is provided at the end of the axial connecting member, and the end face connecting member is fixedly connected to the end face of the rotor assembly.

[0011] Preferably, the end face connecting member is an annular disc-shaped structure whose shape is adapted to the end face shape of the rotor assembly, and the end face connecting member and the rotor assembly are fixed by welding or screwing.

[0012] Preferably, the axial connecting member is a cylindrical structure or a rod-shaped structure.

[0013] Preferably, the axial bearing includes a first bearing portion and a second bearing portion. The first bearing portion is fixedly provided on the mounting frame, the second bearing portion is fixedly provided on the housing, and the thrust disc is located between the first bearing portion and the second bearing portion.

[0014] Preferably, the thrust disc is provided at the end face position of the main shaft and forms an integral structure with the main shaft.

[0015] Preferably, the housing includes a front housing and a rear housing. The front housing and the rear housing are a split structure and are fixedly connected together. The mounting frame is provided on the rear housing, and the stator assembly is installed on the front housing.

[0016] Preferably, the front housing includes a stepped end cover extending axially from the outer peripheral side to the inner peripheral side away from the stator assembly. The end cover includes a first end wall, a second end wall, a third end wall, and a fourth end wall arranged in sequence along the axial direction away from the stator assembly, and adjacent end walls are fixedly connected by an axial connecting section.

[0017] Preferably, a first step is formed between the first end wall and the second end wall. The first end wall is attached to the end wall of the stator assembly, and a first stepped groove is formed between the second end wall and the end wall of the stator assembly. The stator assembly includes a stator winding, and the stator winding is arranged in the first stepped groove.

[0018] Preferably, a second stepped groove is formed between the second end wall and the third end wall. When the magnetic suspension motor includes a thrust disc and an axial connecting member, the thrust disc and the axial connecting member are arranged on the axial inner side of the second stepped groove, and the axial connecting member is located on the radial inner side of the axial connecting section between the second end wall and the third end wall.

[0019] Preferably, when the motor includes a second bearing portion, the radial outer wall of the second bearing portion fits against the radial inner wall of the axial connection section between the third end wall and the fourth end wall, and the axial outer wall of the second bearing portion fits against the axial inner wall of the fourth end wall.

[0020] According to another aspect of the present application, there is provided an air conditioner including a magnetic levitation motor, which is the above-mentioned magnetic levitation motor.

[0021] The magnetic levitation motor provided by the present application includes a housing, a rotor assembly, a stator assembly, a main shaft, a mounting bracket, a radial magnetic levitation bearing, and an axial bearing. The mounting bracket is fixedly arranged on the housing, the radial magnetic levitation bearing is fixedly mounted on the mounting bracket, the rotor assembly is sleeved on the outer periphery of the radial magnetic levitation bearing, the stator assembly is sleeved on the outer periphery of the rotor assembly, the main shaft is arranged on the axial outer side of the rotor assembly and fixedly connected to the rotor assembly, the axial bearing is used to adjust the axial position of the main shaft, and the radial magnetic levitation bearing is used to adjust the radial position of the rotor assembly. In this magnetic levitation motor, the main shaft is arranged on the axial outer side of the rotor assembly, and then the radial magnetic levitation bearing is arranged on the inner peripheral side of the rotor assembly, so that the setting position of the radial magnetic levitation coincides with the setting position of the rotor assembly axially, thus not affecting the torque output of the rotor assembly, while reducing the axial length of the main shaft, further reducing the axial dimension of the entire magnetic levitation motor, optimizing the overall structure, reducing the overall axial dimension of the whole machine, enabling the magnetic levitation motor to be conveniently applied to application scenarios with small space and large inertia requirements, and improving the applicable range of the motor. Description of the Drawings

[0022] Figure 1 is a longitudinal sectional structure schematic diagram of the magnetic levitation motor according to an embodiment of the present application;

[0023] Figure 2 is a cross-sectional structure schematic diagram of the magnetic levitation motor according to an embodiment of the present application.

[0024] The reference numerals are shown as:

[0025] 1, rotor assembly; 2, stator assembly; 3, main shaft; 4, mounting bracket; 5, radial magnetic levitation bearing; 6, first stop projection; 7, convex block; 8, mounting groove; 9, thrust plate; 10, axial connecting member; 11, end face connecting member; 12, first bearing portion; 13, second bearing portion; 14, front housing; 15, rear housing; 16, first end wall; 17, second end wall; 18, third end wall; 19, fourth end wall; 20, second stop projection. Detailed Embodiments

[0026] Refer to in combination Figures 1 to 2As shown, according to an embodiment of the present application, a magnetic levitation motor includes a housing, a rotor assembly 1, a stator assembly 2, a main shaft 3, a mounting frame 4, a radial magnetic levitation bearing 5, and an axial bearing. The mounting frame 4 is fixedly arranged on the housing, the radial magnetic levitation bearing 5 is fixedly installed on the mounting frame 4, the rotor assembly 1 is sleeved on the outer periphery of the radial magnetic levitation bearing 5, the stator assembly 2 is sleeved on the outer periphery of the rotor assembly 1, the main shaft 3 is arranged on the axial outer side of the rotor assembly 1 and is fixedly connected to the rotor assembly 1, the axial bearing is used to adjust the axial position of the main shaft 3, and the radial magnetic levitation bearing 5 is used to adjust the radial position of the rotor assembly 1.

[0027] In this magnetic levitation motor, the main shaft 3 is arranged on the axial outer side of the rotor assembly 1, and then the radial magnetic levitation bearing 5 is arranged on the inner peripheral side of the rotor assembly 1, so that the setting position of the radial magnetic levitation coincides with the setting position of the rotor assembly 1 axially, which can not affect the torque output of the rotor assembly 1, while reducing the axial length of the main shaft 3, thereby reducing the axial dimension of the entire magnetic levitation motor, optimizing the overall structure, reducing the overall axial dimension of the whole machine, enabling the magnetic levitation motor to be conveniently applied to application scenarios with limited space and large inertia requirements, and improving the application range of the motor.

[0028] In the present application, since the main shaft 3 does not necessarily have to be located on the inner peripheral side of the rotor assembly 1, as long as the torque of the rotor assembly 1 can be smoothly output to the main shaft 3, this feature can be utilized to transform the main shaft. Without increasing the length of the main shaft 3, the connection position between the rotor assembly 1 and the main shaft 3 can be changed, thereby vacating the position on the inner peripheral side of the rotor assembly 1. Since the radial magnetic levitation bearing 5 is arranged along the axial direction of the main shaft 3 and the axial part where the rotor assembly 1 is located necessarily exists, the space generated on the inner periphery of the rotor assembly 1 due to the structural change of the main shaft 3 can be utilized to arrange the radial magnetic levitation bearing 5. Thus, while ensuring the radial support of the radial magnetic levitation bearing 5 for the rotor assembly 1, no additional axial space is occupied, and the overall axial length of the magnetic levitation motor is mainly determined by the rotor assembly 1 and the main shaft 3, eliminating the axial section required for setting the radial magnetic levitation bearing 5. Therefore, the overall axial dimension of the magnetic levitation motor can be significantly reduced, and the overall size of the motor can be reduced without changing the motor output torque, enabling the motor to meet the usage requirements in complex environments. In addition, since the axial length of the main shaft 3 is significantly reduced, the cost of the motor can be greatly reduced.

[0029] In this application, the radial magnetic suspension bearing 5 includes a radial iron core and a radial winding. The radial iron core is installed on the mounting bracket 4. The two axial end faces of the radial iron core are flush with the two axial end faces of the rotor assembly 1. The radial winding is wound axially on the radial iron core and is evenly distributed circumferentially along the radial iron core, so as to be able to form a uniform radial acting force in the circumferential direction of the rotor assembly 1, making it more convenient for the rotor assembly 1 to achieve radial balance and improving the stability during the operation of the magnetic suspension motor. A current is passed through the radial winding to provide electromagnetic force for the radial magnetic suspension bearing 5, and a radial bearing electromagnetic circuit is formed through the radial iron core, the radial air gap and the rotor assembly 1, so that the rotor assembly 1 is suspended in the radial direction.

[0030] The radial iron core is composed of laminated silicon steel sheets with strong magnetic conductivity. The laminated method is beneficial to reducing eddy current loss and improving efficiency. Slots are opened in the laminations, and radial windings wound with enameled wires are arranged in the slots to provide an electromagnetic field and form a radial bearing stator.

[0031] In this application, the two axial end faces of the radial iron core are flush with the two axial end faces of the rotor assembly 1. Therefore, it can be ensured that the magnetic field formed by the radial winding forms a radial acting force in the entire axial direction of the rotor assembly 1, which is more conducive to achieving the radial balance of the rotor assembly 1. At the same time, the radial magnetic suspension bearing 5 of this application is arranged at the inner circle center of the rotor assembly 1, and a single radial magnetic suspension bearing 5 can be used to achieve the radial suspension of the rotor assembly 1, effectively reducing the axial dimension of the whole machine, improving the assembly accuracy, and saving the cost of a radial magnetic suspension bearing 5 at the same time.

[0032] In other embodiments, at least two radial magnetic suspension bearings 5 can also be arranged axially at intervals in the inner hole of the rotor assembly 1, and it will not occupy additional axial length either. Therefore, it can also provide a radial suspension force for the rotor assembly 1 while reducing the axial dimension of the whole machine.

[0033] The radial magnetic suspension bearing 5 is integrally fixed in the housing through the mounting bracket 4 to provide a basic supporting function for the whole machine structure.

[0034] The stator core of the stator assembly 2 is formed by stacking electrical steel sheets and is installed and fixed on the front housing. The motor winding is wound in the stator core to provide a rotational driving force for the rotor assembly 1. An electromagnetic circuit of the motor is formed through the stator core, the motor air gap and the rotor assembly 1, so that the rotor rotates in the circumferential direction.

[0035] A first stop protrusion 6 is provided on the mounting bracket 4. The first stop protrusion 6 is used to define the axial mounting position of the radial magnetic suspension bearing 5 on the mounting bracket 4. The first stop protrusion 6 is an annular protrusion, which can effectively axially position the installation of the radial magnetic suspension bearing 5 on the mounting bracket 4, ensuring the installation accuracy and installation efficiency of the radial magnetic suspension bearing 5.

[0036] The mounting bracket 4 includes a mounting shaft which is disposed through the inner peripheral side of the radial magnetic suspension bearing 5, and one end of the mounting shaft is fixedly arranged on the housing. In this application, the mounting bracket 4 adopts the structural form of the mounting shaft, which can facilitate the machining of the mounting shaft, improve the machining efficiency, and also facilitate the installation of the radial magnetic suspension bearing 5 on the mounting bracket 4. Preferably, in order to ensure the stability and reliability of the mounting structure of the mounting bracket 4 on the housing, the mounting shaft may include an anti-rotation section and a cylindrical section, wherein the anti-rotation section has anti-rotation cutting edges or is a polygonal structure, the cylindrical section is integrally formed with the anti-rotation section and is located on the inner peripheral side of the rotor assembly 1, the anti-rotation section is fixedly installed on the housing, and the radial magnetic suspension bearing 5 is installed on the cylindrical section.

[0037] The housing is provided with a convex block 7 protruding axially away from the radial magnetic suspension bearing 5, and a mounting groove 8 is arranged on the back side of the convex block 7. The mounting shaft is installed in the mounting groove 8. By providing the convex block 7 on the housing and arranging the axially extending mounting groove 8 in the convex block 7, the axial mating length between the mounting shaft and the housing can be increased, the supporting strength of the housing for the mounting shaft can be improved, and further the supporting strength and structural stability of the mounting shaft for the radial magnetic suspension bearing 5 can be ensured.

[0038] In this embodiment, a thrust disc 9 is fixedly arranged at one end of the main shaft 3 close to the rotor assembly 1, an axial connecting member 10 extending towards the rotor assembly 1 is fixedly arranged on the outer peripheral side of the thrust disc 9 away from the main shaft 3, and an end face connecting member 11 is arranged at the end of the axial connecting member 10. The end face connecting member 11 is fixedly connected to the end face of the rotor assembly 1. As a part of connecting the main shaft 3 and the rotor assembly 1, the thrust disc 9 can realize the fixed connection between the main shaft 3 and the rotor assembly 1, and at the same time can also be the acting object of the axial bearing to realize the adjustment of the axial position of the main shaft 3. Therefore, the axial dimension of the magnetic suspension motor can be further shortened, which is beneficial to the flattening of the magnetic suspension motor, saves copper wire, and has better heat dissipation.

[0039] The end face connecting member 11 is an annular disc-shaped structure whose shape is adapted to the end face shape of the rotor assembly 1, and the end face connecting member 11 is fixedly connected to the rotor assembly 1 by welding or screwing. The end face connecting member 11 is used to realize the fixed connection with the end face of the rotor assembly 1, which is convenient for the rotor assembly 1 to transmit torque to the main shaft 3, and then the torque is output through the main shaft 3. The end face connecting member 11 can be an annular disc-shaped structure, forming a good fixed connection with the end face of the rotor assembly 1, or can be a plurality of plate-shaped structures arranged at intervals in the circumferential direction, and each plate-shaped structure is fixedly connected to the rotor assembly 1 at its set position, so as to realize the fixed connection between the rotor assembly 1 and the main shaft 3 as a whole.

[0040] The axial connecting member 10 is a cylindrical structure or a rod-shaped structure. When the end face connecting member 11 is an annular disc-shaped structure, the axial connecting member 10 can adopt a cylindrical structure. When the end face connecting member 11 is a plate-shaped structure arranged at circumferential intervals, the axial connecting member 10 can adopt a rod-shaped structure, with one rod corresponding to one plate, or multiple rods corresponding to one plate.

[0041] The axial bearing includes a first bearing portion 12 and a second bearing portion 13. The first bearing portion 12 is fixedly arranged on the mounting bracket 4, and the second bearing portion 13 is fixedly arranged on the housing. The thrust disc 9 is located between the first bearing portion 12 and the second bearing portion 13. Both the first bearing portion 12 and the second bearing portion 13 include an iron core and a winding. Among them, the first bearing portion 12, the axial air gap, and the thrust disc 9 form a first electromagnetic circuit for applying an axial force to the main shaft 3 to move in the first direction. The second bearing portion 13, the axial air gap, and the thrust disc 9 form a second electromagnetic circuit for applying an axial force to the main shaft 3 to move in the second direction, and the first direction is opposite to the second direction. By adjusting the magnitudes of the winding currents of the first bearing portion 12 and the second bearing portion 13, the magnitudes of the electromagnetic forces output by the first bearing portion 12 and the second bearing portion 13 can be adjusted, and further the position of the thrust disc 9 in the axial direction can be adjusted, so that the thrust disc 9 floats at a preset position in the axial direction.

[0042] Preferably, the thrust disc 9 is arranged at the end face position of the main shaft 3 and forms an integral structure with the main shaft 3. On the one hand, the forming process can be reduced and the forming difficulty can be lowered. On the other hand, the connection structure strength between the thrust disc 9 and the main shaft 3 can be more effectively ensured, and the consistency of the structures of the main shaft 3 and the thrust disc 9 can be improved.

[0043] The housing includes a front housing 14 and a rear housing 15. The front housing 14 and the rear housing 15 are split structures and are fixedly connected together. The mounting bracket 4 is arranged on the rear housing 15, and the stator assembly 2 is mounted on the front housing 14. By dividing the housing into the front housing 14 and the rear housing 15, the housing can form a split structure, which can not only reduce the processing difficulty of the housing but also facilitate the installation and fixation of various components inside the housing.

[0044] The front housing 14 includes a stepped end cover extending axially from the outer peripheral side to the inner peripheral side in a direction away from the stator assembly 2. The end cover includes a first end wall 16, a second end wall 17, a third end wall 18, and a fourth end wall 19 arranged in sequence along the axial direction away from the stator assembly 2, and adjacent end walls are fixedly connected through an axial connection section.

[0045] A first step is formed between the first end wall 16 and the second end wall 17. The first end wall 16 is in contact with the end wall of the stator assembly 2. A first stepped groove is formed between the second end wall 17 and the end wall of the stator assembly 2. The stator assembly 2 includes a stator winding, and the stator winding is arranged in the first stepped groove. The contact between the first end wall 16 and the end wall of the stator assembly 2 can ensure a tighter fit between the front housing 14 and the stator assembly 2, and guarantee the stability and reliability of the installation structure of the stator assembly 2 on the front housing 14. Arranging the stator winding in the first stepped groove can not only ensure a tight fit between the stator assembly 2 and the housing, but also make full use of the reasonable design of the structure of the stator assembly 2 to design the structure of the housing, so that the structure of the housing can be fully utilized and it is convenient to install and arrange the stator winding.

[0046] A second stepped groove is formed between the second end wall 17 and the third end wall 18. When the magnetic levitation motor includes a thrust disk 9 and an axial connecting member 10, the thrust disk 9 and the axial connecting member 10 are arranged on the axial inner side of the second stepped groove, and the axial connecting member 10 is located on the radial inner side of the axial connecting section between the second end wall 17 and the third end wall 18. Since the axial length of the axial connecting member 10 is much longer than the thickness of the stator winding, if the second end wall 17 extends radially to the position where the axial connecting member 10 is located, interference will occur between the second end wall 17 and the axial connecting member 10. At this time, forming a third end wall 18 on the housing with an axial distance farther from the second end wall 17 can form a sufficient axial distance between the third end wall 18 and the rotor assembly 1, meet the installation requirements of the axial connecting member 10 and the thrust disk 9, and at the same time, it will not increase the volume of the housing, which is convenient for realizing the miniaturization and compactness of the housing.

[0047] A third stepped groove is formed between the third end wall 18 and the fourth end wall 19. When the magnetic levitation motor includes a second bearing portion 13, the radial outer wall of the second bearing portion 13 is in contact with the radial inner wall of the axial connecting section between the third end wall 18 and the fourth end wall 19, and the axial outer wall of the second bearing portion 13 is in contact with the axial inner wall of the fourth end wall 19. Since the second bearing portion 13 is located on the axial outer side of the thrust disk 9, when the axial distance between the third end wall 18 and the thrust disk 9 is appropriate, the distance between the second bearing portion 13 and the third end wall 18 will be too small, resulting in insufficient installation space between the third end wall 18 and the thrust disk 9 to install the second bearing portion 13. Therefore, at this time, a fourth end wall 19 is provided on the axial outer side of the third end wall 18, so that there is enough space between the fourth end wall 19 and the thrust disk 9 to install the second bearing portion 13. At the same time, an installation step can be formed by using the fourth end wall 19 and the axial connecting section it is connected to, so that the second bearing portion 13 can be fixedly installed through the fourth end wall 19 and the axial connecting section at the same time, improving the stability and reliability of the installation structure of the second bearing portion 13 on the housing.

[0048] For the first bearing portion 12, a second stop projection 20 is further provided at one end of the mounting bracket 4 close to the thrust plate 9. The second stop projection 20 can axially position the installation of the first bearing portion 12 on the mounting bracket 4, facilitating the fixed installation of the first bearing portion 12 on the mounting bracket 4.

[0049] In the present application, the front housing 14 adopts a continuous stepped structure as the end cover structure, which can utilize the stepped grooves formed by the continuous stepped structure to form an increasing axial installation space, so that the end cover can meet the installation requirements of different internal structures. Thus, without increasing the volume of the housing, the internal space of the housing can be effectively utilized to realize the installation of each internal structure, the structural layout is more reasonable, it is more conducive to the miniaturization of the housing, making the structure of the housing more compact, better meeting the use requirements of narrow spaces, and at the same time effectively ensuring the output torque.

[0050] According to an embodiment of the present application, the air conditioner includes a magnetic levitation motor, and the magnetic levitation motor is the above-mentioned magnetic levitation motor.

[0051] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above advantageous methods can be freely combined and superimposed.

[0052] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and variations can still be made, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A magnetic levitation motor, characterized in that, it includes a housing, a rotor assembly (1), a stator assembly (2), a main shaft (3), a mounting bracket (4), a radial magnetic levitation bearing (5) and an axial bearing. The mounting bracket (4) is fixedly arranged on the housing. The radial magnetic levitation bearing (5) is fixedly installed on the mounting bracket (4). The rotor assembly (1) is sleeved on the outer periphery of the radial magnetic levitation bearing (5). The stator assembly (2) is sleeved on the outer periphery of the rotor assembly (1). The main shaft (3) is arranged on the axial outer side of the rotor assembly (1) and is fixedly connected to the rotor assembly (1). The axial bearing is used to adjust the axial position of the main shaft (3), and the radial magnetic levitation bearing (5) is used to adjust the radial position of the rotor assembly (1).

2. The magnetic levitation motor according to claim 1, characterized in that, the radial magnetic levitation bearing (5) includes a radial iron core and a radial winding. The radial iron core is installed on the mounting bracket (4). The two axial end faces of the radial iron core are flush with the two axial end faces of the rotor assembly (1). The radial winding is wound axially on the radial iron core, and the radial winding is evenly distributed along the circumferential direction of the radial iron core.

3. The magnetic levitation motor according to claim 1, characterized in that, a first stop projection (6) is arranged on the mounting bracket (4), and the first stop projection (6) is used to define the axial mounting position of the radial magnetic levitation bearing (5) on the mounting bracket (4).

4. The magnetic levitation motor according to claim 1, characterized in that, the mounting bracket (4) includes a mounting shaft, and the mounting shaft passes through the inner peripheral side of the radial magnetic levitation bearing (5), and one end of the mounting shaft is fixedly arranged on the housing.

5. The magnetic levitation motor according to claim 4, characterized in that, a convex block (7) axially protruding away from the radial magnetic levitation bearing (5) is arranged on the housing. An installation groove (8) is arranged on the back side of the convex block (7), and the mounting shaft is installed in the installation groove (8).

6. The magnetic levitation motor according to any one of claims 1 to 5, characterized in that, a thrust disk (9) is fixedly arranged at one end of the main shaft (3) close to the rotor assembly (1). An axial connecting member (10) extending towards the rotor assembly (1) is fixedly arranged on the outer peripheral side of the thrust disk (9) away from the main shaft (3). An end face connecting member (11) is arranged at the end of the axial connecting member (10), and the end face connecting member (11) is fixedly connected to the end face of the rotor assembly (1).

7. The magnetic levitation motor according to claim 6, characterized in that, the end face connecting member (11) is an annular disk-shaped structure whose shape is adapted to the end face shape of the rotor assembly (1), and the end face connecting member (11) is fixedly connected to the rotor assembly (1) by welding or screwing.

8. The magnetic levitation motor according to claim 7, characterized in that, the axial connecting member (10) is a cylindrical structure or a rod-shaped structure.

9. The magnetic levitation motor according to claim 6, characterized in that, the axial bearing includes a first bearing portion (12) and a second bearing portion (13), the first bearing portion (12) is fixedly arranged on the mounting frame (4), the second bearing portion (13) is fixedly arranged on the housing, and the thrust disc (9) is located between the first bearing portion (12) and the second bearing portion (13).

10. The magnetic levitation motor according to claim 6, characterized in that, the thrust disc (9) is arranged at the end face position of the main shaft (3) and forms an integral structure with the main shaft (3).

11. The magnetic levitation motor according to any one of claims 1 to 5 or 7 to 10, characterized in that, the housing includes a front housing (14) and a rear housing (15), the front housing (14) and the rear housing (15) are of a split structure and are fixedly connected together, the mounting frame (4) is arranged on the rear housing (15), and the stator assembly (2) is mounted on the front housing (14).

12. The magnetic levitation motor according to claim 11, characterized in that, the front housing (14) includes a stepped end cover extending axially from the outer peripheral side to the inner peripheral side in a direction away from the stator assembly (2), and the end cover includes a first end wall (16), a second end wall (17), a third end wall (18) and a fourth end wall (19) arranged in sequence along the axial direction away from the stator assembly (2), and adjacent end walls are fixedly connected by an axial connecting section.

13. The magnetic levitation motor according to claim 12, characterized in that, a first step is formed between the first end wall (16) and the second end wall (17), the first end wall (16) is in contact with the end wall of the stator assembly (2), a first stepped groove is formed between the second end wall (17) and the end wall of the stator assembly (2), and the stator assembly (2) includes a stator winding, and the stator winding is arranged in the first stepped groove.

14. The magnetic levitation motor according to claim 12, characterized in that, a second stepped groove is formed between the second end wall (17) and the third end wall (18). When the magnetic levitation motor includes a thrust disc (9) and an axial connecting member (10), the thrust disc (9) and the axial connecting member (10) are arranged on the axial inner side of the second stepped groove, and the axial connecting member (10) is located on the radial inner side of the axial connecting section between the second end wall (17) and the third end wall (18).

15. The magnetic levitation motor according to claim 12, characterized in that, a third stepped groove is formed between the third end wall (18) and the fourth end wall (19). When the magnetic levitation motor includes a second bearing portion (13), the radial outer wall of the second bearing portion (13) is in contact with the radial inner wall of the axial connecting section between the third end wall (18) and the fourth end wall (19), and the axial outer wall of the second bearing portion (13) is in contact with the axial inner wall of the fourth end wall (19).

16. An air conditioner, comprising a magnetic levitation motor, It is characterized in that the magnetic levitation motor is the magnetic levitation motor described in any one of claims 1 to 15

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