A magnetic levitation motor with a composite heat dissipation method

Abstract

The present invention discloses a magnetic levitation motor with a composite heat dissipation method, which relates to the technical field of magnetic levitation motors and includes a heat dissipation component, wherein the heat dissipation component includes a housing, a rear end cover, a front end cover, a motor shaft, two magnetic levitation bearings, a liquid storage box, a liquid return box, a rotor, and an S-shaped flow channel. The present invention sets two flow paths in the magnetic levitation motor, wherein the first flow path is formed by the liquid storage box, the liquid infusion tube, the cooling tube, the heat dissipation groove, the cooling tube, the liquid infusion tube, and the liquid return box, and the second flow path is formed by the second liquid inlet flow channel, the S-shaped flow channel, the first liquid inlet flow channel, and the liquid return box, thereby achieving heat dissipation for the stator, the rotor, and the motor shaft; an air cooling mechanism is set, and when the motor shaft rotates, the heat dissipation for the magnetic levitation motor can be achieved; compared with the prior art, the present invention combines liquid cooling and air cooling, so that heat can be discharged evenly, thereby improving the heat dissipation effect on the stator and the mover.

Description

Technical Field

[0001] The invention relates to a magnetic levitation motor, in particular to a magnetic levitation motor with a composite heat dissipation method, and belongs to the technical field of magnetic levitation motors. Background Art

[0002] The magnetic levitation motor is a high-speed motor that uses magnetic levitation bearings to make the rotor free of mechanical friction during operation, thereby effectively increasing the rotor's speed. The magnetic levitation high-speed motor avoids the friction of traditional mechanical bearings, thereby greatly improving efficiency. It has low energy loss and high energy efficiency, and is more efficient than traditional motors. In order to dissipate the heat generated by its internal components in a timely manner when using a high-speed magnetic levitation motor, it is usually necessary to set corresponding heat dissipation components on the motor.

[0003] Traditional magnetic levitation motors generally use air cooling structure, which mainly removes heat through air flow. In magnetic levitation motors, the guide fan structure guides the external air to flow into the casing from one side, and then passes through the gap between the stator and the mover and is discharged from the other side. This kind of heat dissipation effect is poor, including the following reasons:

[0004] (1) The gap between the stator and the mover is usually very small, which limits the air flow channel and speed. Even if the guide fan can generate a certain wind speed, the air flow speed and heat dissipation effect in the gap will be limited due to the limitation of the gap, so the heat dissipation effect is poor;

[0005] (2) When the magnetic levitation motor is working, the stator and the mover will generate a lot of heat. However, due to the limitations of the air cooling method, this heat cannot be evenly distributed and effectively removed, especially the contact surface or internal area of ​​the stator and the mover. As a result, the stator and the mover cannot be efficiently cooled, and the heat dissipation effect is poor.

[0006] Therefore, a magnetic levitation motor with a composite heat dissipation method is proposed. Summary of the invention

[0007] The object of the present invention is to provide a magnetic levitation motor with a composite heat dissipation method to solve one of the problems raised in the above background technology.

[0008] The present invention is implemented by the following technical solutions: a magnetic suspension motor with a composite heat dissipation method, including a heat dissipation component, the heat dissipation component including a housing, a rear end cover, a front end cover, a motor shaft, two magnetic suspension bearings, a liquid storage box, a liquid return box, two infusion tubes, a cooling tube, a heat dissipation slot, a stator, a rotor, and an S-shaped flow channel;

[0009] The rear end cover and the front end cover are symmetrically installed at the two ends of the casing, the motor shaft is coaxially rotatably connected to the rear end cover and the front end cover through two magnetic bearings, the heat dissipation groove is evenly opened inside the stator, the openings at both ends of the heat dissipation groove are respectively located at the two ends of the stator, the two infusion pipes are respectively located at the two ends of the stator, and the infusion pipes are connected to a plurality of cooling pipes on a side close to the stator, the cooling pipes are fixedly connected to the openings of the heat dissipation groove in a one-to-one correspondence, one infusion pipe is connected to a liquid storage box, and the other infusion pipe is connected to a liquid return box, the S-shaped flow channel is opened inside the rotor, and the first liquid inlet flow channel and the second liquid inlet flow channel are respectively opened inside the motor shaft, and the first liquid inlet flow channel and the second liquid inlet flow channel are respectively connected to the openings at both ends of the S-shaped flow channel.

[0010] As a further preferred embodiment of the present technical solution: the motor shaft is rotatably connected to the liquid return box and the liquid storage box respectively, the first liquid inlet channel is communicated with the liquid return box, and the second liquid inlet channel is communicated with the liquid storage box.

[0011] As a further preferred embodiment of the present technical solution: the rotor is mounted on the outer side wall of the motor shaft, and the rotor is located inside the stator.

[0012] As a further preferred embodiment of the present technical solution: the liquid storage box is installed on the outer side wall of the rear end cover, a liquid inlet pipe is installed on the outer side wall of the liquid storage box, and the liquid return box is located inside the housing and fixedly connected to the front end cover.

[0013] As a further preferred embodiment of the present technical solution: a liquid return pipe is installed on the outer side wall of the liquid return box, and the liquid return pipe is located outside the casing.

[0014] As a further preferred embodiment of the present technical solution: the heat dissipation assembly also includes air inlets, cooling fins, a negative pressure guide fan and an exhaust duct, the air inlets are evenly arranged on the outer wall of the rear end cover, the cooling fins are fixedly connected to the side of the liquid return box away from the front end cover, the negative pressure guide fan is fixedly installed on the outer wall of the motor shaft, the exhaust duct is evenly installed inside the liquid return box, and the exhaust duct passes through two sides of the liquid return box that are perpendicular to the motor shaft.

[0015] As a further preferred embodiment of the technical solution: a plurality of exhaust holes are evenly opened on the side surface of the front end cover, the exhaust holes penetrate two surfaces of the front end cover that are perpendicular to the motor shaft, and the front end cover is arranged adjacent to the negative pressure guide fan.

[0016] As a further preferred embodiment of the present technical solution: the exhaust holes are connected to the exhaust pipes in a one-to-one correspondence, and the exhaust holes are connected to the casing through the exhaust pipes.

[0017] As a further preferred embodiment of the technical solution: the stator is fixedly connected to the inner wall of the casing, and a stator winding is wound inside the stator.

[0018] As a further preferred embodiment of the present technical solution: a protective cover is fixedly connected to the outer side wall of the front end cover, the negative pressure guide fan is located on the inner side of the protective cover, and the protective cover is rotatably connected to the outer side wall of the motor shaft.

[0019] Advantages of the present invention:

[0020] 1. The present invention sets two flow paths in the magnetic levitation motor, wherein the first flow path is formed by the liquid storage box, the liquid infusion tube, the cooling tube, the heat dissipation groove, the cooling tube, the liquid infusion tube and the liquid return box, and the second flow path is formed by the second liquid inlet flow channel, the S-shaped flow channel, the first liquid inlet flow channel and the liquid return box. When the magnetic levitation motor is working, the coolant in the liquid storage box can flow into the two flow paths at the same time, thereby realizing heat dissipation of the stator, the rotor and the motor shaft;

[0021] 2. The present invention can form an air cooling mechanism through the coordination of air inlet holes, heat dissipation fins, negative pressure guide fans and exhaust pipes. When the motor shaft rotates, it can take away the heat accumulated in the casing to achieve heat dissipation of the magnetic suspension motor.

[0022] 3. The present invention combines liquid cooling with air cooling, so that heat can be discharged evenly. During the heat dissipation process, it will not be restricted by the gap, thereby improving the heat dissipation effect on the stator and the mover. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a magnetic levitation motor with a composite heat dissipation method according to the present invention;

[0025] Figure 2 It is a schematic diagram of the rear end cover structure of the present invention;

[0026] Figure 3 It is a disassembly schematic diagram of the present invention;

[0027] Figure 4 It is a schematic diagram of the stator structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the rotor structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the motor shaft structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the front end cover structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the liquid return box of the present invention;

[0032] Fig. 9 It is a schematic diagram of the air-cooling flow channel of the present invention;

[0033] Fig.10 It is a schematic diagram of the liquid cooling channel of the present invention.

[0034] In the figure: 101, heat dissipation assembly; 11, casing; 12, rear end cover; 13, front end cover; 14, protective cover; 15, motor shaft; 16, air inlet; 17, liquid inlet pipe; 18, liquid storage box; 19, liquid return box; 20, liquid return pipe; 21, liquid infusion pipe; 22, cooling pipe; 23, heat dissipation groove; 24, stator; 25, rotor; 26, S-shaped flow channel; 27, magnetic bearing; 28, first liquid inlet flow channel; 29, cooling fins; 30, exhaust hole; 31, negative pressure guide fan; 32, exhaust pipe; 33, second liquid inlet flow channel. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example

[0037] See also Figure 1-Figure 10 The present invention provides a technical solution: a magnetic suspension motor with a composite heat dissipation method, including a heat dissipation component 101, the heat dissipation component 101 includes a housing 11, a rear end cover 12, a front end cover 13, a motor shaft 15, two magnetic suspension bearings 27, a liquid storage box 18, a liquid return box 19, two infusion tubes 21, a cooling tube 22, a heat dissipation groove 23, a stator 24, a rotor 25, and an S-shaped flow channel 26;

[0038] The rear cover 12 and the front cover 13 are symmetrically mounted at both ends of the housing 11. The motor shaft 15 is coaxially rotatably connected to the rear cover 12 and the front cover 13 through two magnetic bearings 27. The stator 24 is fixedly connected to the inner wall of the housing 11. The stator winding is wound inside the stator 24.

[0039] When the magnetic suspension high-speed motor is working, the stator winding on the stator 24 is powered, thereby driving the rotor 25 to rotate, and the rotor 25 drives the motor shaft 15, and the motor shaft 15 rotates through the magnetic suspension bearing 27. By setting the magnetic suspension bearing 27, the motor shaft 15 can be made to rotate without mechanical friction, thereby increasing the speed of the motor shaft 15, and the motor shaft 15 drives the external load, thereby realizing the transmission of force;

[0040] The heat dissipation grooves 23 are evenly arranged inside the stator 24, and the openings at both ends of the heat dissipation grooves 23 are respectively located at both ends of the stator 24. Two infusion pipes 21 are respectively located at both ends of the stator 24. A surface of the infusion pipe 21 close to the stator 24 is connected with a plurality of cooling pipes 22. The cooling pipes 22 are fixedly connected with the openings of the heat dissipation grooves 23 in a one-to-one correspondence. One infusion pipe 21 is connected with the liquid storage box 18, and the other infusion pipe 21 is connected with the liquid return box 19. The S-shaped flow channel 26 is arranged inside the rotor 25. The first liquid inlet flow channel 28 and the second liquid inlet flow channel 33 are respectively arranged inside the motor shaft 15. The first liquid inlet flow channel 28 and the second liquid inlet flow channel 33 are respectively connected with the openings at both ends of the S-shaped flow channel 26.

[0041] The heat dissipation component 101 is used to realize the heat dissipation of the magnetic levitation motor. During liquid cooling, the coolant generates two flow paths in the magnetic levitation motor:

[0042] The first flow path of the coolant: the liquid storage box 18, the liquid infusion tube 21, the cooling tube 22, the heat dissipation tank 23, the cooling tube 22, the liquid infusion tube 21, and the liquid return box 19;

[0043] The second flow path of the coolant: the liquid storage box 18, the second liquid inlet channel 33, the S-shaped channel 26, the first liquid inlet channel 28, and the liquid return box 19;

[0044] The first flow path flows through the stator 24, and the second flow path flows through the motor shaft 15 and the rotor 25, thereby achieving heat dissipation for the stator 24, the rotor 25 and the motor shaft 15, so that the heat in the stator 24, the rotor 25 and the motor shaft 15 is effectively taken away, thereby improving the heat dissipation effect.

[0045] In this embodiment, specifically: the motor shaft 15 is rotatably connected to the liquid return box 19 and the liquid storage box 18 respectively, the motor shaft 15 is connected to the liquid return box 19 and the liquid storage box 18 respectively through the first liquid inlet channel 28, the rotor 25 is installed on the outer side wall of the motor shaft 15, and the rotor 25 is located inside the stator 24;

[0046] One end opening of the second liquid inlet channel 33 is located on the end surface of one end of the motor shaft 15, and the other end opening of the second liquid inlet channel 33 is located on the outer cylindrical surface of the motor shaft 15; the openings at both ends of the first liquid inlet channel 28 are both located on the outer cylindrical surface of the motor shaft 15; one end of the motor shaft 15 is rotatably connected to the liquid storage box 18 through a sealed bearing, so that the liquid storage box 18 is connected to the opening at one end of the second liquid inlet channel 33, and the other end opening of the second liquid inlet channel 33 is connected to one end of the S-shaped channel 26; the motor shaft 15 is rotatably connected to the liquid return box 19 through two other sealed bearings, and there is a gap between the two sealed bearings rotatably connected to the liquid return box 19, and the openings at both ends of the first liquid inlet channel 28 are connected to the other end of the S-shaped channel 26 and the liquid return box 19 respectively, and when the motor shaft 15 rotates at high speed, the coolant in the liquid return box 19 and the coolant in the liquid storage box 18 will not overflow;

[0047] The left and right parts of the motor shaft 15 are respectively provided with a first liquid inlet channel 28 and a second liquid inlet channel 33. The left second liquid inlet channel 33 extends inward from the left end of the motor shaft 15 and passes through the outer wall of the motor shaft 15.

[0048] The left end of the motor shaft 15 is located inside the liquid storage box 18, so the coolant in the liquid storage box 18 can flow into the second liquid inlet channel 33 on the left side, and then flow into the S-shaped channel 26;

[0049] The first liquid inlet channel 28 on the right side extends from the outer wall of the motor shaft 15 to the center of the motor shaft 15, then extends to the right side, and finally penetrates through the outer wall of the motor shaft 15;

[0050] The opening of the first liquid inlet channel 28 located on the right side is located inside the liquid return box 19, so the first liquid inlet channel 28 is connected to the liquid return box 19;

[0051] The inner coolant of the S-shaped flow channel 26 flows into the first liquid inlet flow channel 28 located on the right side, and then flows into the liquid return box 19 from the opening;

[0052] Since the positions of the liquid storage box 18 and the liquid return box 19 are both fixed, and the liquid storage box 18 and the liquid return box 19 are both disc-shaped, the opening of the second liquid inlet flow channel 33 is located in the liquid storage box 18, and the opening of the first liquid inlet flow channel 28 is located in the liquid return box 19, so when the motor shaft 15 drives the two flow channels to rotate, the second liquid inlet flow channel 33 and the first liquid inlet flow channel 28 can still maintain communication with the liquid storage box 18 and the liquid return box 19;

[0053] When the magnetic levitation motor is liquid-cooled, the coolant in the liquid storage box 18 flows into the motor shaft 15 through the second liquid inlet channel 33 on one side, then flows into the S-shaped channel 26 in the rotor 25, and finally flows into the liquid return box 19 from the first liquid inlet channel 28 on the other side, so that the coolant can flow in the rotor 25, thereby realizing liquid cooling of the rotor 25.

[0054] In this embodiment, specifically: the liquid storage box 18 is installed on the outer wall of the rear end cover 12, the outer wall of the liquid storage box 18 is installed with a liquid inlet pipe 17, and the liquid return box 19 is located inside the housing 11 and fixedly connected to the front end cover 13;

[0055] The liquid inlet pipe 17 is used to transport the coolant into the liquid storage box 18 . After the coolant in the liquid storage box 18 is filled, the coolant flows into the second liquid inlet channel 33 to achieve heat dissipation and cooling of the motor shaft 15 and the rotor 25 .

[0056] In this embodiment, specifically: a liquid return pipe 20 is installed on the outer wall of the liquid return box 19, and the liquid return pipe 20 is located outside the housing 11;

[0057] The liquid return box 19 is used to recover the coolant flowing out from the motor shaft 15 and the stator 24, and then the returned coolant flows out from the liquid return pipe 20;

[0058] The liquid inlet pipe 17 and the liquid return pipe 20 are connected via a circulation pump, thereby enabling the circulation of the coolant to continuously dissipate heat for the magnetic levitation motor.

[0059] In this embodiment, specifically: the heat dissipation assembly 101 also includes an air inlet 16, a heat dissipation fin 29, a negative pressure guide fan 31 and an exhaust pipe 32, the air inlet 16 is evenly opened on the outer wall of the rear end cover 12, the heat dissipation fin 29 is fixedly connected to the side of the liquid return box 19 away from the front end cover 13, the negative pressure guide fan 31 is fixedly installed on the outer wall of the motor shaft 15, the exhaust pipe 32 is evenly installed inside the liquid return box 19, and the exhaust pipe 32 passes through the two sides of the liquid return box 19 that are perpendicular to the motor shaft 15;

[0060] Through the coordination of the air inlet 16, the heat dissipation fins 29, the negative pressure guide fan 31 and the exhaust pipe 32, an air cooling mechanism can be formed;

[0061] When the magnetic levitation motor is working, the motor shaft 15 drives the negative pressure guide fan 31 to work, and the external air flows into the interior of the housing 11 from the air inlet 16, and then flows to the other side from the gap between the rotor 25 and the stator 24 and is discharged from the housing 11. During the flow of air, the heat accumulated in the housing 11 can be taken away, thereby achieving heat dissipation of the magnetic levitation motor;

[0062] The cooling liquid in the liquid return box 19 can be cooled by the cooling fins 29 , and when the air cooling mechanism is in operation, the heat dissipated by the cooling fins 29 can be discharged together, thereby achieving heat dissipation and cooling of the cooling liquid.

[0063] In the present embodiment, specifically: a plurality of exhaust holes 30 are evenly opened on the side of the front end cover 13, the exhaust holes 30 pass through the two sides of the front end cover 13 that are perpendicular to the motor shaft 15, the front end cover 13 is arranged adjacent to the negative pressure guide fan 31, the exhaust holes 30 are used to discharge the heat accumulated in the casing 11, when the negative pressure guide fan 31 rotates, negative pressure is formed at the exhaust holes 30, the external air flows into the casing 11 from one side, and then is discharged from the exhaust holes 30, thereby realizing air cooling of the magnetic levitation motor.

[0064] In this embodiment, specifically: the exhaust holes 30 are connected to the exhaust pipes 32 in a one-to-one correspondence, the exhaust holes 30 are connected to the housing 11 through the exhaust pipes 32, the exhaust pipes 32 and the liquid return box 19 are an integrated structure, when the air flows from the housing 11 into the exhaust pipes 32, the air contacts the heat dissipation fins 29, and then the coolant in the liquid return box 19 can be cooled;

[0065] During air cooling, the air flow path is: air inlet 16, housing 11, exhaust pipe 32, exhaust hole 30. Through air cooling, the heat in the housing 11 can be discharged, and the coolant in the return liquid box 19 can be cooled and cooled.

[0066] In this embodiment, specifically: the outer wall of the front end cover 13 is fixedly connected with a protective cover 14, the negative pressure guide fan 31 is located on the inner side of the protective cover 14, the protective cover 14 is rotatably connected to the outer wall of the motor shaft 15, and the protective cover 14 can play a protective role. When the magnetic levitation motor is working, it drives the negative pressure guide fan 31 to rotate at high speed, and the protective cover 14 can prevent accidental touching.

[0067] Working principle or structural principle, when in use, the stator winding on the stator 24 is powered, thereby driving the rotor 25 to rotate, the rotor 25 drives the motor shaft 15, the motor shaft 15 rotates through the magnetic bearing 27, the motor shaft 15 drives the external load, thereby realizing the transmission of force, the external coolant circulation pump works, the coolant flows into the liquid storage box 18, the infusion pipe 21, the cooling pipe 22, the heat dissipation groove 23, the cooling pipe 22, the infusion pipe 21 and the liquid return box 19 form a first flow path, the second liquid inlet channel 33, the S-shaped channel 26, the first liquid inlet channel 28 and the liquid return box 19 form a second flow path, the coolant in the liquid storage box 18 flows into the two flow paths at the same time, thereby taking away the heat in the stator 24, the rotor 25 and the motor shaft 15, and realizing the heat dissipation of the stator 24, the rotor 25 and the motor shaft 15;

[0068] The motor shaft 15 also drives the negative pressure guide fan 31 to work. At this time, the external air flows into the interior of the casing 11 from the air inlet 16, and then flows to the other side from the gap between the rotor 25 and the stator 24 and is discharged from the casing 11. During the flow of air, it contacts the motor shaft 15, stator 24, rotor 25, cooling fins 29, and exhaust duct 32 respectively, thereby taking away the heat accumulated in the casing 11 and realizing the heat dissipation of the magnetic levitation motor.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic levitation motor with a composite heat dissipation method, characterized in that: The heat dissipation assembly (101) comprises a housing (11), a rear end cover (12), a front end cover (13), a motor shaft (15), two magnetic bearings (27), a liquid storage box (18), a liquid return box (19), two liquid infusion tubes (21), a cooling tube (22), a heat dissipation groove (23), a stator (24), a rotor (25), and an S-shaped flow channel (26); The rear end cover (12) and the front end cover (13) are symmetrically mounted at two ends of the housing (11); the motor shaft (15) is coaxially rotatably connected to the rear end cover (12) and the front end cover (13) via two magnetic suspension bearings (27); the heat dissipation grooves (23) are evenly arranged inside the stator (24); the openings at both ends of the heat dissipation grooves (23) are respectively located at two ends of the stator (24); the two infusion tubes (21) are respectively located at two ends of the stator (24); and a surface of the infusion tube (21) close to the stator (24) is connected to a plurality of cooling tubes. (22), the cooling pipe (22) is fixedly connected to the opening of the heat dissipation groove (23) in a one-to-one correspondence, one of the infusion pipes (21) is connected to the liquid storage box (18), and the other of the infusion pipes (21) is connected to the liquid return box (19), the S-shaped flow channel (26) is opened inside the rotor (25), and the inside of the motor shaft (15) is respectively provided with a first liquid inlet flow channel (28) and a second liquid inlet flow channel (33), and the first liquid inlet flow channel (28) and the second liquid inlet flow channel (33) are respectively connected to the openings at both ends of the S-shaped flow channel (26); The motor shaft (15) is rotatably connected to the liquid return box (19) and the liquid storage box (18), respectively; the first liquid inlet channel (28) is in communication with the liquid return box (19); and the second liquid inlet channel (33) is in communication with the liquid storage box (18).

2. The magnetic levitation motor with a composite heat dissipation method according to claim 1, characterized in that: The rotor (25) is mounted on the outer side wall of the motor shaft (15), and the rotor (25) is located inside the stator (24).

3. The magnetic levitation motor with a composite heat dissipation method according to claim 2, characterized in that: The liquid storage box (18) is mounted on the outer side wall of the rear end cover (12), and a liquid inlet pipe (17) is mounted on the outer side wall of the liquid storage box (18). The liquid return box (19) is located inside the housing (11) and is fixedly connected to the front end cover (13).

4. The magnetic levitation motor with a composite heat dissipation method according to claim 3, characterized in that: A liquid return pipe (20) is installed on the outer side wall of the liquid return box (19), and the liquid return pipe (20) is located outside the casing (11).

5. The magnetic levitation motor with a composite heat dissipation method according to claim 1, characterized in that: The heat dissipation assembly (101) further comprises an air inlet (16), a heat dissipation fin (29), a negative pressure guide fan (31) and an exhaust pipe (32); the air inlet (16) is evenly arranged on the outer side wall of the rear end cover (12); the heat dissipation fin (29) is fixedly connected to a side of the liquid return box (19) away from the front end cover (13); the negative pressure guide fan (31) is fixedly mounted on the outer side wall of the motor shaft (15); the exhaust pipe (32) is evenly mounted inside the liquid return box (19); and the exhaust pipe (32) passes through two surfaces of the liquid return box (19) that are perpendicular to the motor shaft (15).

6. The magnetic levitation motor with a composite heat dissipation method according to claim 5, characterized in that: A plurality of exhaust holes (30) are evenly arranged on the side surface of the front end cover (13), and the exhaust holes (30) penetrate two surfaces of the front end cover (13) that are perpendicular to the motor shaft (15). The front end cover (13) is arranged adjacent to the negative pressure guide fan (31).

7. The magnetic levitation motor with a composite heat dissipation method according to claim 6, characterized in that: The exhaust holes (30) are connected to the exhaust pipes (32) in a one-to-one correspondence, and the exhaust holes (30) are connected to the casing (11) via the exhaust pipes (32).

8. The magnetic levitation motor with a composite heat dissipation method according to claim 2, characterized in that: The stator (24) is fixedly connected to the inner wall of the casing (11), and a stator winding is wound inside the stator (24).

9. The magnetic levitation motor with a composite heat dissipation method according to claim 6, characterized in that: The outer wall of the front end cover (13) is fixedly connected to a protective cover (14); the negative pressure guide fan (31) is located on the inner side of the protective cover (14); and the protective cover (14) is rotatably connected to the outer wall of the motor shaft (15).

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