A rotor cooling device for a permanent magnet motor

Abstract

The present invention relates to the technical field of cooling devices, and specifically to a rotor cooling device for a permanent magnet motor, which includes a rotor body and a mounting shell rotatably arranged on the outside of the rotor body: an air-blowing heat dissipation mechanism is arranged on the inside of the mounting shell; a circulating heat dissipation mechanism rotates on the outside of the rotor body; a transfer box is rotatably arranged on the outside of a stirring plate, and the transfer box is arranged on the air-blowing heat dissipation mechanism. The present invention arranges a circulating heat dissipation mechanism, and the bevel gear drives the cooling oil to circulate in the circulation pipe, thereby absorbing the heat on the rotor core, and dissipating the heat through stirring blades, and then dissipating the heat through heat sinks in the heat dissipation box, thereby performing multiple heat dissipation. In this way, the heat can be dissipated at the diffusion port through the stirring blades, thereby effectively dissipating the heat in the cooling oil preliminarily, and dissipating the heat to the surrounding environment through the heat sink, ensuring that the temperature inside the motor is effectively controlled, preventing the motor from being damaged due to overheating, and protecting the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling devices, and in particular to a rotor cooling device for a permanent magnet motor. Background Art

[0002] Permanent magnet motors generate a lot of heat during operation, especially in the rotor part, which will accumulate significant heat due to high-speed rotation and magnetic field. If the heat cannot be dissipated in time, the performance of the permanent magnet will be degraded, and even irreversible demagnetization will occur, thus affecting the overall performance and life of the motor. Therefore, a reasonably designed rotor cooling device is crucial to the reliability and durability of permanent magnet motors.

[0003] The Chinese patent with the announcement number CN202503382U discloses a permanent magnet synchronous motor rotor cooled by an annular rotating heat pipe, which is composed of a rotor welding part, a bearing, a permanent magnet magnetic steel, a rotor sealing ring and an annular rotating heat pipe cooler. The annular rotating heat pipe cooler conducts the heat generated by the permanent magnet magnetic steel and the rotor yoke to the rotating shaft, and then conducts it to other cooling devices through the rotating shaft, and discharges the heat from the permanent magnet synchronous motor rotor to avoid excessive temperature caused by rotor eddy current loss.

[0004] However, the above disclosed solutions have the following shortcomings: the existing rotor cooling device for permanent magnet motors cannot dissipate heat from the rotor core while dissipating intermittent heat between the rotor and the stator, resulting in poor heat dissipation of the rotor, thereby causing damage to the permanent magnet motor. Summary of the invention

[0005] The present invention aims to solve the problem in the background technology that the rotor stator gap and the rotor core cannot be cooled at the same time, and propose a rotor cooling device for a permanent magnet motor.

[0006] The technical solution of the present invention is: a rotor cooling device for a permanent magnet motor, comprising a rotor body and a mounting housing rotatably arranged outside the rotor body; and further comprising:

[0007] An air-blowing heat dissipation mechanism is arranged on the inner side of the mounting shell and is used to perform heat exchange on the hot air generated by the rotor body and blow cold air to the gap between the rotor and the stator;

[0008] A circulating heat dissipation mechanism, which rotates the outer side of the rotor body to circulate heat from the rotor core;

[0009] And a stirring plate, a transfer box is rotatably arranged on the outer side of the stirring plate, the transfer box is arranged on the air blowing heat dissipation mechanism, the outer side of the stirring plate is in contact with the transfer box, the stirring plate is provided with three blades, the three blades divide the transfer box into three separated sealed spaces for separately conveying cold air and hot air.

[0010] The air-intake heat dissipation mechanism includes a conveying component and a power component;

[0011] The power assembly is arranged outside the rotor body and is used to provide power for the conveying assembly;

[0012] The conveying assembly is arranged on the mounting shell and is used to discharge the hot air and blow the cold air to the gap between the rotor and the stator.

[0013] The power assembly includes a bevel gear 1, a bevel gear 2, a circular gear 1 and a circular gear 2;

[0014] Bevel gear one is arranged on the outside of the rotor body, bevel gear two is arranged on the outside of bevel gear one, connecting shaft one is arranged at the axis center of bevel gear two, circular gear one is arranged at the end of connecting shaft one away from bevel gear two, circular gear two is arranged on the side of circular gear one, connecting shaft two is arranged at the axis center of circular gear two, and a mounting plate is rotatably arranged at the end of connecting shaft one away from circular gear one.

[0015] The conveying assembly includes a fixing rod, a cold air generator and a cold air pipe;

[0016] The fixing rod is arranged on the outside of the mounting shell, the cold air generator is arranged on the top of the fixing rod, the cold air pipe is arranged on the output end of the cold air generator, the side of the transfer box is provided with an air supply pipe, and the bottom of the transfer box is provided with an exhaust pipe.

[0017] The circulation heat dissipation mechanism includes a circulation component and a heat dissipation component;

[0018] The circulation component is arranged on the outside of the rotor body and is used to drive the internal cooling oil to circulate;

[0019] The heat dissipation component is arranged on the side of the circulation component and is used for multiple heat dissipation of the cooling oil after absorbing heat.

[0020] The circulation assembly includes bevel gear three, bevel gear four, a circulation box and a circulation pipe;

[0021] Bevel gear three is arranged on the outside of the rotor body, bevel gear four is arranged on the side of bevel gear three, a rotating tube is arranged on the inside of bevel gear four, a circular ring slide is rotatably arranged at the end of the rotating tube, a circulation tube is arranged on the inside of the circular ring slide, a circulation box is arranged at the end of the circulation tube, a spiral blade is arranged on the inside of the rotating tube, and a connecting shaft three is arranged on the inside of the spiral blade.

[0022] The heat dissipation assembly includes a heat dissipation pipe, a connecting frame, a motor and a heat dissipation box;

[0023] The heat dissipation box is arranged on the circulation pipe, a heat dissipation fin is arranged on the inner side of the heat dissipation box, the heat dissipation pipe is arranged on the inner side of the circulation pipe, a diffusion port is arranged on the top of the heat dissipation pipe, a connecting frame is arranged on the inner side of the diffusion port, a motor is arranged on the inner side of the connecting frame, a rotating shaft is arranged on the output end of the motor, a connecting ring is arranged on the outer side of the rotating shaft, a stirring blade is arranged on the outer side of the connecting ring, and a baffle is arranged on the inner side of the diffusion port.

[0024] On the other hand, the present invention provides a heat dissipation method for a rotor cooling device for a permanent magnet motor, comprising the following steps:

[0025] S1. When the permanent magnet motor is working, it drives the rotor body to rotate, the rotor body drives the bevel gear 1 to rotate, the bevel gear 1 drives the bevel gear 2 to rotate, the bevel gear 2 drives the circular gear 1 to rotate, the circular gear 1 drives the circular gear 2 to rotate, and the circular gear 2 drives the stirring plate to rotate;

[0026] S2. The cold air generator generates cold air, which is transported to the transfer box through the cold air pipe. The cold air rotates under the drive of the stirring plate and is ejected from the air pipe. At the same time, the hot air enters the transfer box through the air pipe and is ejected from the exhaust pipe under the drive of the stirring plate, thereby performing gas exchange and completing the heat dissipation between the stator and the rotor.

[0027] S3, at the same time, the rotor body drives the bevel gear 3 to rotate, and the bevel gear 3 drives the spiral blade to rotate through the rotating tube, thereby driving the cooling oil in the circulation tube to circulate;

[0028] S4, start the motor. When the flowing cooling oil passes through the heat dissipation pipe, the motor drives the rotating shaft to rotate. The rotating shaft drives the stirring blade to rotate through the connecting ring, and the cooling oil at the bottom is stirred to the top for preliminary heat dissipation.

[0029] S5. After the initial heat dissipation, the cooling oil continues to flow into the heat dissipation box. The heat sink in the heat dissipation box dissipates the cooling oil for a second time, and the cooling oil is sent back to the circulation box through the circulation pipe at the other end to complete the cooling of the rotor core.

[0030] Compared with the prior art, the present invention has the following beneficial technical effects:

[0031] 1. Through the setting of the air-blowing heat dissipation mechanism, the bevel gear drives the stirring plate to rotate in the transfer box, so as to blow the cold air generated by the cold air generator into the gap between the stator and the rotor, and discharge the hot air in the permanent magnet motor. This can more directly and effectively take away the heat generated inside the motor. Compared with the traditional air cooling method, the heat dissipation efficiency is significantly improved, ensuring the stable operation of the motor at a higher power density, optimizing the overall performance of the motor, and reducing material aging and performance degradation caused by high temperature, thereby extending the service life of the motor.

[0032] 2. Through the setting of the circulating heat dissipation mechanism, bevel gear three drives the cooling oil to circulate in the circulation pipe, thereby absorbing the heat on the rotor core, and dissipating the heat through the stirring blades, and then dissipating the heat through the heat sink in the heat dissipation box, so as to perform multiple heat dissipation. In this way, the heat can be dissipated at the diffusion port through the stirring blades, thereby effectively dissipating the heat in the cooling oil. At the same time, the motor drives the stirring blades to stir the cooling oil, so that the cooling oil at the bottom can be stirred to the surface, which speeds up the heat dissipation speed of the cooling oil and makes the cooling oil temperature in the circulation pipe more uniform. Then, the heat is dissipated for the second time through the heat sink, which can directly contact the rotor core and effectively absorb the heat thereon, thereby realizing efficient heat transfer, and can continuously take away the heat, and dissipate the heat to the surrounding environment through the heat sink, ensuring that the temperature inside the motor is effectively controlled, preventing the motor from being damaged due to overheating, and protecting the internal structure and components of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0035] Figure 3 It is a structural schematic diagram of the air blowing heat dissipation mechanism;

[0036] Figure 4 It is a schematic diagram of the internal structure of the air blowing heat dissipation mechanism;

[0037] Figure 5 It is a structural schematic diagram of a circulating heat dissipation mechanism;

[0038] Figure 6 It is a schematic diagram of the internal structure of the circulating heat dissipation mechanism;

[0039] Figure 7 for Figure 6 A is an enlarged schematic diagram.

[0040] Figure numerals: 1, rotor body; 2, mounting housing; 301, bevel gear 1; 302, cold air pipe; 303, fixing rod; 304, cold air generator; 305, transfer box; 306, mounting plate; 307, bevel gear 2; 308, circular gear 1; 309, connecting shaft 1; 310, circular gear 2; 311, connecting shaft 2; 312, stirring plate; 313, air pipe; 314, exhaust pipe; 401, heat dissipation box ; 402, circulation pipe; 403, heat dissipation pipe; 404, diffuser; 405, motor; 406, connecting frame; 407, rotating shaft; 408, connecting ring; 409, stirring blade; 410, heat sink; 411, bevel gear three; 412, bevel gear four; 413, rotating pipe; 414, circular slide rail; 415, spiral blade; 416, connecting shaft three; 417, baffle plate; 418, circulation box; 5, rotor core. DETAILED DESCRIPTION

[0041] Embodiment 1

[0042] like Figure 1-Figure 4 As shown, a rotor cooling device for a permanent magnet motor proposed by the present invention comprises a rotor body 1, a rotor core 5 arranged outside the rotor body 1, and a mounting housing 2 rotatably arranged outside the rotor body 1:

[0043] The air blowing heat dissipation mechanism is arranged on the inner side of the mounting housing 2, and is used to perform heat exchange with the hot air generated by the rotor body 1 and blow cold air to the gap between the rotor and the stator;

[0044] The circulating heat dissipation mechanism rotates the outer side of the rotor body 1 to circulate heat to the rotor core 5;

[0045] A transfer box 305 is rotatably arranged on the outer side of the stirring plate 312. The transfer box 305 is arranged on the air blowing heat dissipation mechanism. The outer side of the stirring plate 312 is in contact with the transfer box 305. The stirring plate 312 is provided with three blades. The three blades divide the transfer box 305 into three separated sealed spaces for separately transporting cold air and hot air.

[0046] The air intake and heat dissipation mechanism includes a conveying component and a power component; the power component is arranged on the outside of the rotor body 1 to provide power for the conveying component; the conveying component is arranged on the mounting shell 2 to discharge hot air and blow cold air to the gap between the rotor and the stator. The power assembly includes a bevel gear 1 301, a bevel gear 2 307, a circular gear 1 308 and a circular gear 2 310; the bevel gear 1 301 is arranged on the outside of the rotor body 1, the bevel gear 2 307 is arranged on the outside of the bevel gear 1 301, and the bevel gear 2 307 is meshed with the bevel gear 1 301, and two bevel gears 2 307 are arranged in a ring around the bevel gear 1 301, a connecting shaft 1 309 is arranged at the axis of the bevel gear 2 307, and a circular gear 1 308 is arranged at one end of the connecting shaft 1 309 away from the bevel gear 2 307, and the circular gear 2 310 is arranged on the side of the circular gear 1 308, and the circular gear 2 310 is meshed with the circular gear 1 308, and a connecting shaft 2 311 is arranged at the axis of the circular gear 2 310, and the end of the connecting shaft 2 311 away from the circular gear 2 310 and the stirring The inner side of the moving plate 312 is connected, and a mounting plate 306 is rotatably provided at one end of the connecting shaft 1 309 away from the circular gear 1 308. The side of the mounting plate 306 away from the connecting shaft 1 309 is connected to the inner side of the mounting shell 2, and the end of the connecting shaft 2 311 away from the stirring plate 312 is rotatably connected to the mounting plate 306. The rotor body 1 is driven to rotate by the permanent magnet motor during operation, and the rotor body 1 drives the bevel gear 1 301 to rotate, and the bevel gear 1 301 drives the bevel gear 2 307 to rotate. The bevel gear 2 307 drives the circular gear 1 308 to rotate through the connecting shaft 1 309, and the circular gear 1 308 drives the circular gear 2 310 to rotate. The circular gear 2 310 drives the stirring plate 312 to rotate through the connecting shaft 2 311. When the stirring plate 312 rotates, the gas in the transfer box 305 is transported. The delivery assembly includes a fixed rod 303, a cold air generator 304 and a cold air pipe 302; the fixed rod 303 is arranged on the outside of the mounting shell 2, the cold air generator 304 is arranged on the top of the fixed rod 303, the cold air pipe 302 is arranged at the output end of the cold air generator 304, the end of the cold air pipe 302 away from the cold air generator 304 is connected to the transfer box 305, the side of the transfer box 305 is provided with a gas delivery pipe 313, the bottom of the transfer box 305 is provided with an exhaust pipe 314, and the cold air generator 3 04 generates cold air, which is transported to the top of the transfer box 305 through the cold air pipe 302. The cold air rotates under the drive of the stirring plate 312, passes through the air pipe 313 during rotation, and is ejected from the air pipe 313. At the same time, hot air enters the transfer box 305 through the air pipe 313, and is ejected from the exhaust pipe 314 under the drive of the stirring plate 312, thereby completing the gas exchange. The jet direction of the air pipe 313 points to the gap between the stator and the rotor, thereby cooling the gap.

[0047] Embodiment 2

[0048] like Figure 5-Figure 7As shown, the present invention proposes a rotor cooling device for a permanent magnet motor. Compared with the first embodiment, this embodiment introduces the structure of a circulating heat dissipation mechanism.

[0049] The circulation heat dissipation mechanism includes a circulation component and a heat dissipation component; the circulation component is arranged on the outside of the rotor body 1, and is used to drive the internal cooling oil to circulate; the heat dissipation component is arranged on the side of the circulation component, and is used to perform multiple heat dissipation on the cooling oil after absorbing heat. The circulation component includes bevel gear three 411, bevel gear four 412, circulation box 418 and circulation pipe 402; bevel gear three 411 is arranged on the outside of the rotor body 1, bevel gear four 412 is arranged on the side of bevel gear three 411, bevel gear four 412 and bevel gear three 411 are meshed, a rotating tube 413 is arranged on the inside of bevel gear four 412, a circular slide rail 414 is rotatably arranged on the end of the rotating tube 413, and the circulation pipe 402 is arranged on the inside of the circular slide rail 414, and the circulation pipe 402 is arranged in a ring around the upper half of the outside of the mounting shell 2, and the circulation Box 418 is arranged at the end of the circulation pipe 402, and the side of the circulation box 418 is connected to the side of the rotor core 5. A spiral blade 415 is arranged on the inner side of the rotating pipe 413, and a connecting shaft three 416 is arranged on the inner side of the spiral blade 415. Bevel gear three 411 rotates under the drive of the rotor body 1, and bevel gear three 411 drives bevel gear four 412 to rotate. Bevel gear four 412 drives the rotating pipe 413 to rotate on the circular slide rail 414. The rotating pipe 413 drives the spiral blade 415 to rotate, thereby driving the cooling oil in the circulation pipe 402 to circulate. The heat dissipation assembly includes a heat dissipation pipe 403, a connecting frame 406, a motor 405 and a heat dissipation box 401; the heat dissipation box 401 is arranged on the circulation pipe 402, and a heat sink 410 is arranged on the inner side of the heat dissipation box 401, and a plurality of heat sinks 410 are arranged at equal intervals in the heat dissipation box 401; the heat dissipation pipe 403 is arranged on the inner side of the circulation pipe 402, and a diffuser 404 is arranged on the top of the heat dissipation pipe 403, and the diffuser 404 is a tapered pipe with an opening facing upward, and the opening on the top is larger, which is used to accelerate the heat dissipation of the cooling oil after absorbing heat, the connecting frame 406 is arranged on the inner side of the diffuser 404, the motor 405 is arranged on the inner side of the connecting frame 406, the rotating shaft 407 is arranged at the output end of the motor 405, the outer side of the rotating shaft 407 is provided with a connecting ring 408, and the outer side of the connecting ring 408 is provided with a stirring blade 409, a baffle plate 417 is provided on the inner side of the diffuser 404, and a plurality of filter holes are provided on the baffle plate 417 for passing air, but blocking the cooling oil in the diffuser 404 to avoid waste of cooling oil, and the motor 405 is started, and the motor 405 drives the rotating shaft 407 to rotate, and the rotating shaft 407 drives the connecting ring 408 to rotate, and the connecting ring 408 drives the stirring blade 409 to rotate, so as to stir the cooling oil in the diffuser 404, so that the cooling oil at the bottom can be stirred to the top to accelerate the heat dissipation effect, and then the cooling oil after the initial heat dissipation continues to flow into the heat dissipation box 401 along the circulation pipe 402, and is dissipated again through the heat sink 410. After the heat dissipation is completed, the cooling oil flows into the circulation box 418 again through the circulation pipe 402 at the other end to cool the rotor core 5.

[0050] In summary, when the present invention is used, the permanent magnet motor will drive the rotor body 1 to rotate when it is working. When the rotor body 1 rotates, it drives the bevel gear 1 301 to rotate. The bevel gear 1 301 drives the bevel gear 2 307 to rotate. The bevel gear 2 307 drives the circular gear 1 308 to rotate through the connecting shaft 1 309. The circular gear 1 308 drives the circular gear 2 310 to rotate. The circular gear 2 310 drives the stirring plate 312 to rotate through the connecting shaft 2 311. At this time, the cold air generator 304 generates cold air, and the cold air is transported to the top of the transfer box 305 through the cold air pipe 302. The cold air rotates under the drive of the stirring plate 312, passes through the air pipe 313 during rotation, and is ejected from the air pipe 313. At the same time, the hot air enters the transfer box 305 through the air pipe 313, and the hot air is ejected from the exhaust pipe 314 under the drive of the stirring plate 312, so that the hot air and the cold air between the stator and the rotor are heat exchanged, thereby reducing the temperature of the rotor. At the same time, the rotor body 1 drives the bevel gear three 411 to rotate, the bevel gear three 411 drives the bevel gear four 412 to rotate, the bevel gear four 412 drives the rotating tube 413 to rotate on the circular slide rail 414, the rotating tube 413 drives the spiral blade 415 to rotate, thereby driving the cooling oil in the circulation tube 402 to circulate, when the cooling oil flows to the heat dissipation tube 403 in the circulation tube 402, the motor 405 is started, the motor 405 drives the rotating shaft 407 to rotate, the rotating shaft 407 drives the connecting ring 408 to rotate, the connecting ring 408 drives the stirring blade 409 to rotate, thereby stirring the cooling oil in the diffuser 404, so that the cooling oil at the bottom can be stirred to the top, and then the cooling oil continues to flow into the heat dissipation box 401 along the circulation tube 402, and dissipates heat again through the heat sink 410. After the heat dissipation is completed, the cooling oil flows into the circulation box 418 again through the circulation tube 402 at the other end to cool the rotor core 5.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rotor cooling device for a permanent magnet motor, comprising a rotor body (1) and a mounting housing (2) rotatably arranged outside the rotor body (1); characterized in that: Also includes: An air-blowing heat dissipation mechanism, which is arranged on the inner side of the mounting housing (2) and is used to perform heat exchange on the hot air generated by the rotor body (1) and to blow cold air toward the gap between the rotor and the stator; A circulating heat dissipation mechanism, which rotates the outer side of the rotor body (1) to circulate heat from the rotor core (5); and a stirring plate (312), a transfer box (305) is rotatably arranged on the outer side of the stirring plate (312), the transfer box (305) is arranged on the air blowing heat dissipation mechanism, the outer side of the stirring plate (312) and the transfer box (305) are in contact with each other, the stirring plate (312) is provided with three blades, and the three blades divide the transfer box (305) into three separated sealed spaces for separately conveying cold air and hot air.

2. The rotor cooling device for a permanent magnet motor according to claim 1, characterized in that: The air-intake heat dissipation mechanism includes a conveying component and a power component; The power component is arranged outside the rotor body (1) and is used to provide power for the conveying component; The conveying assembly is arranged on the mounting shell (2) and is used to discharge hot air and blow cold air toward the gap between the rotor and the stator.

3. The rotor cooling device for a permanent magnet motor according to claim 2, characterized in that: The power assembly includes a bevel gear 1 (301), a bevel gear 2 (307), a circular gear 1 (308) and a circular gear 2 (310); Bevel gear one (301) is arranged on the outer side of the rotor body (1), bevel gear two (307) is arranged on the outer side of bevel gear one (301), a connecting shaft one (309) is arranged at the axis center of bevel gear two (307), a circular gear one (308) is arranged at the end of connecting shaft one (309) away from bevel gear two (307), circular gear two (310) is arranged on the side of circular gear one (308), a connecting shaft two (311) is arranged at the axis center of circular gear two (310), and a mounting plate (306) is rotatably arranged at the end of connecting shaft one (309) away from circular gear one (308).

4. The rotor cooling device for a permanent magnet motor according to claim 2, characterized in that: The conveying assembly comprises a fixing rod (303), a cold air generator (304) and a cold air pipe (302); The fixing rod (303) is arranged on the outside of the mounting shell (2), the cold air generator (304) is arranged on the top of the fixing rod (303), the cold air pipe (302) is arranged at the output end of the cold air generator (304), the side of the transfer box (305) is provided with an air supply pipe (313), and the bottom of the transfer box (305) is provided with an exhaust pipe (314).

5. The rotor cooling device for a permanent magnet motor according to claim 1, characterized in that: The circulation heat dissipation mechanism includes a circulation component and a heat dissipation component; The circulation component is arranged on the outside of the rotor body (1) and is used to drive the internal cooling oil to circulate; The heat dissipation component is arranged on the side of the circulation component and is used for multiple heat dissipation of the cooling oil after absorbing heat.

6. The rotor cooling device for a permanent magnet motor according to claim 5, characterized in that: The circulation assembly includes bevel gear three (411), bevel gear four (412), a circulation box (418) and a circulation pipe (402); Bevel gear three (411) is arranged on the outer side of the rotor body (1), bevel gear four (412) is arranged on the side of bevel gear three (411), a rotating tube (413) is arranged on the inner side of bevel gear four (412), a circular slide rail (414) is rotatably arranged at the end of the rotating tube (413), a circulation tube (402) is arranged on the inner side of the circular slide rail (414), a circulation box (418) is arranged on the end of the circulation tube (402), a spiral blade (415) is arranged on the inner side of the rotating tube (413), and a connecting shaft three (416) is arranged on the inner side of the spiral blade (415).

7. The rotor cooling device for a permanent magnet motor according to claim 6, characterized in that: The heat dissipation assembly includes a heat dissipation pipe (403), a connecting frame (406), a motor (405) and a heat dissipation box (401); The heat dissipation box (401) is arranged on the circulation pipe (402), a heat sink (410) is arranged on the inner side of the heat dissipation box (401), a heat dissipation pipe (403) is arranged on the inner side of the circulation pipe (402), a diffuser (404) is arranged on the top of the heat dissipation pipe (403), a connecting frame (406) is arranged on the inner side of the diffuser (404), a motor (405) is arranged on the inner side of the connecting frame (406), a rotating shaft (407) is arranged on the output end of the motor (405), a connecting ring (408) is arranged on the outer side of the rotating shaft (407), a stirring blade (409) is arranged on the outer side of the connecting ring (408), and a baffle plate (417) is arranged on the inner side of the diffuser (404).

8. A heat dissipation method for a rotor cooling device for a permanent magnet motor according to claim 7, characterized in that: The following steps are involved: S1, when the permanent magnet motor is working, it drives the rotor body (1) to rotate, the rotor body (1) drives the bevel gear 1 (301) to rotate, the bevel gear 1 (301) drives the bevel gear 2 (307) to rotate, the bevel gear 2 (307) drives the circular gear 1 (308) to rotate, the circular gear 1 (308) drives the circular gear 2 (310) to rotate, and the circular gear 2 (310) drives the stirring plate (312) to rotate; S2, the cold air generator (304) generates cold air, which is transported to the transfer box (305) through the cold air pipe (302). The cold air rotates under the drive of the stirring plate (312) and is ejected from the air delivery pipe (313). At the same time, the hot air enters the transfer box (305) through the air delivery pipe (313) and is ejected from the exhaust pipe (314) under the drive of the stirring plate (312), thereby performing gas exchange and completing heat dissipation between the stator and the rotor. S3. At the same time, the rotor body (1) drives the bevel gear three (411) to rotate, and the bevel gear three (411) drives the spiral blade (415) to rotate through the rotating tube (413), thereby driving the cooling oil in the circulation tube (402) to circulate; S4, starting the motor (405), when the flowing cooling oil passes through the heat dissipation pipe (403), the motor (405) drives the rotating shaft (407) to rotate, and the rotating shaft (407) drives the stirring blade (409) to rotate through the connecting ring (408), so as to stir the cooling oil at the bottom to the top for preliminary heat dissipation; S5. After the initial heat dissipation, the cooling oil continues to flow into the heat dissipation box (401). The heat sink (410) in the heat dissipation box (401) performs secondary heat dissipation on the cooling oil, and the cooling oil after the heat dissipation is sent back to the circulation box (418) through the circulation pipe (402) at the other end, thereby completing the cooling of the rotor core (5).

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