Permanent magnet motors, compressors and air conditioners

Abstract

The present application provides a permanent magnet motor, a compressor and an air conditioner. The permanent magnet motor comprises a rotor assembly (1) and a stator assembly (2), an air gap (3) is formed between the rotor assembly (1) and the stator assembly (2), the rotor assembly (1) comprises a rotor core (15) and a magnetic tile (16) arranged on the outer peripheral side of the rotor core (15), the permanent magnet motor further comprises a gas circulation channel (4), the gas circulation channel (4) is connected to the air gap (3), the air flow passes through the gas circulation channel (4) and the air gap (3) and exchanges heat with the magnetic tile (16), and the outer peripheral side of the rotor core (15) is also provided with a guide vane (5) for guiding the air flow. According to the permanent magnet motor of the present application, the heat dissipation efficiency of the magnetic tile can be effectively improved, and the motor can be effectively protected.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a permanent magnet motor, a compressor and an air conditioner. Background Art

[0002] With the rapid development of permanent magnet motor technology, permanent magnet motors are receiving more and more attention. Compared with other motors such as traditional electromagnetic motors, permanent magnet motors have the advantages of high output density, high efficiency, easy maintenance and simple structure.

[0003] At present, the DC brushless motor adopts plastic-encapsulated stator, and the permanent magnet rotor includes surface-mounted magnetic tile rotor, injection molded rotor and plastic magnetic rotor. Among them, the injection molded rotor is to integrate the magnetic tile and the iron core through a mold. Compared with the surface-mounted magnetic tile rotor, the injection molded rotor does not need glue, and the magnetic tile and the rotor iron core are directly fixed together by injection plastic, which ensures the overall strength of the rotor. However, the contact area between the magnetic tile of the injection molded rotor and the airflow will be reduced, and the airflow performance is poor, which is not conducive to the heat dissipation of the rotor magnetic tile. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a permanent magnet motor, a compressor and an air conditioner, which can improve the air flow efficiency, effectively improve the heat dissipation efficiency of the magnetic tiles, and provide effective protection for the motor.

[0005] In order to solve the above problems, the present application provides a permanent magnet motor, including a rotor assembly and a stator assembly, an air gap is formed between the rotor assembly and the stator assembly, the rotor assembly includes a rotor core and magnetic tiles arranged on the outer peripheral side of the rotor core, the permanent magnet motor also includes a gas circulation channel, the gas circulation channel is connected to the air gap, the air flow flows through the gas circulation channel and the air gap to exchange heat with the magnetic tiles, and the outer peripheral side of the rotor core is also provided with guide vanes to guide the air flow.

[0006] Preferably, the guide vanes are axial flow vanes.

[0007] Preferably, the rotor assembly further comprises a sleeve, which is arranged on the outer peripheral side of the rotor core and the magnetic shoe, and the guide vanes are arranged on the outer peripheral surface of the sleeve.

[0008] Preferably, the inner surface of the sheath fits the outer surface of the magnetic tile.

[0009] Preferably, the inner surface of the sheath matches the outer surface structure of the magnetic tile.

[0010] Preferably, the guide vane extends in the axial direction of the rotor assembly.

[0011] Preferably, the guide vanes are arranged in a one-to-one correspondence with the magnetic tiles along the circumferential direction of the rotor assembly.

[0012] Preferably, the guide vanes are formed on the outer circumferential surface of the rotor core.

[0013] Preferably, the gas circulation channel includes an air outlet hole arranged on the stator assembly, and the air outlet hole is connected to the air gap.

[0014] Preferably, the air outlet hole comprises a radial hole penetrating the stator assembly in a radial direction.

[0015] Preferably, the air outlet hole comprises a radial hole and an axial hole, the radial hole penetrates the stator assembly in the radial direction, and the axial hole penetrates the stator assembly in the axial direction from the radial hole.

[0016] Preferably, the permanent magnet motor further comprises a control board, which is arranged outside the axial end surface of the rotor assembly, with the heat dissipation surface of the control board facing the air gap, and the gas flow channel flows through the control board.

[0017] Preferably, a radiator is provided on the heat dissipation surface of the control board, and the radiator is spaced apart from the rotor assembly to form a gas flow channel.

[0018] Preferably, heat dissipation ribs are provided on the side of the heat sink facing the air gap.

[0019] Preferably, the heat dissipation ribs are arranged radially on the side of the radiator with the rotation axis of the rotor assembly as the center; or, the heat dissipation ribs extend circumferentially around the rotation axis of the rotor assembly on the side of the radiator.

[0020] Preferably, the heat dissipation ribs extend in both the circumferential direction and the axial direction relative to the central rotation axis of the rotor assembly on the side of the heat sink.

[0021] Preferably, the permanent magnet motor further comprises an end cover, on which an air inlet hole is arranged, and the air inlet hole is connected to the gas flow channel.

[0022] Preferably, an air induction cavity is formed between the control plate and the end cover, the gas flow channel includes the air induction cavity, and the air induction cavity is communicated with the air inlet hole.

[0023] Preferably, the distance between the central axis of the radial hole and the end surface of the wind inlet end of the rotor assembly is greater than 1 / 2 of the axial length of the air gap.

[0024] According to another aspect of the present application, a compressor is provided, comprising a permanent magnet motor, which is the permanent magnet motor mentioned above.

[0025] According to another aspect of the present application, an air conditioner is provided, comprising a permanent magnet motor, which is the permanent magnet motor mentioned above.

[0026] The permanent magnet motor provided by the present application includes a rotor assembly and a stator assembly, an air gap is formed between the rotor assembly and the stator assembly, the rotor assembly includes a rotor core and a magnetic tile arranged on the outer peripheral side of the rotor core, the permanent magnet motor also includes a gas circulation channel, the gas circulation channel is connected to the air gap, the airflow flows through the gas circulation channel and the air gap to exchange heat with the magnetic tile, and the outer peripheral side of the rotor core is also provided with a guide vane for guiding the air flow. When the permanent magnet motor is working, the guide vane can be driven to rotate by the rotation of the rotor assembly, and then the guide vane can be rotated to guide the flow, so as to accelerate the flow efficiency of the airflow in the air gap, the airflow flows through the air gap from the gas circulation channel, and exchanges heat with the surface of the magnetic tile when flowing in the air gap, taking away the heat generated by the magnetic tile, thereby effectively cooling the magnetic tile, effectively improving the heat dissipation efficiency of the magnetic tile, and effectively protecting the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic cross-sectional structural diagram of a permanent magnet motor according to an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the three-dimensional structure of a permanent magnet motor according to an embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the rotor assembly of the permanent magnet motor according to an embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the rotor core of the permanent magnet motor of an embodiment of the present application;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the sheath of the permanent magnet motor according to an embodiment of the present application;

[0032] Figure 6 This is a heat dissipation structure diagram of a control board of a permanent magnet motor according to an embodiment of the present application;

[0033] Figure 7 It is a three-dimensional structural diagram of the stator assembly of the permanent magnet motor according to an embodiment of the present application.

[0034] The reference numerals are as follows:

[0035] 1. Rotor assembly; 2. Stator assembly; 3. Air gap; 4. Gas flow channel; 5. Guide vane; 6. Sleeve; 7. Radial hole; 8. Axial hole; 9. Control board; 10. Radiator; 11. Heat dissipation rib; 12. End cover; 13. Air inlet hole; 14. Air induction cavity; 15. Rotor core; 16. Magnetic tile. DETAILED DESCRIPTION

[0036] See also Figures 1 to 7As shown, according to an embodiment of the present application, the permanent magnet motor includes a rotor assembly 1 and a stator assembly 2, an air gap 3 is formed between the rotor assembly 1 and the stator assembly 2, the rotor assembly 1 includes a rotor core 15 and a magnetic tile 16 arranged on the outer peripheral side of the rotor core 15, the permanent magnet motor also includes a gas circulation channel 4, the gas circulation channel 4 is connected to the air gap 3, the air flow flows through the gas circulation channel 4 and the air gap 3 and exchanges heat with the magnetic tile 16, and the outer peripheral side of the rotor core 15 is also provided with a guide vane 5 for guiding the air flow.

[0037] When the permanent magnet motor is working, the rotation of the rotor assembly 1 can drive the air flow from the gas flow channel 4 through the air gap 3, and exchange heat with the surface of the magnetic tile 16 when flowing in the air gap 3, taking away the heat generated by the magnetic tile 16, thereby effectively cooling the magnetic tile 16, effectively improving the heat dissipation efficiency of the magnetic tile 16, and effectively protecting the motor.

[0038] Compared with the prior art, the present application adds a gas flow channel 4 to the permanent magnet motor, and connects the gas flow channel 4 with the air gap 3, so that during the operation of the permanent magnet motor, the gas can continuously flow through the gas flow channel 4 and the air gap 3, thereby continuously cooling the magnetic tiles 16 through the continuously flowing gas, thereby improving the cooling effect on the magnetic tiles 16.

[0039] In order to ensure the flow effect of the gas, the airflow can be driven by adding fan blades, etc. In the actual working process, since the rotor assembly 1 keeps rotating, the rotation of the rotor assembly 1 can also be used to achieve the drainage effect, ensuring that the airflow can continuously flow through the magnetic tile 16, dissipating the heat of the magnetic tile 16, and improving the heat dissipation effect of the magnetic tile 16.

[0040] As the rotor core 15 rotates, the guide vanes 5 can introduce flowing airflow from the axial outer end of the rotor core 15 into the air gap 3. When the airflow with a lower external temperature flows in the air gap 3, an axial airflow will be formed to take away the heat on the surface of the magnetic tile 16, thereby effectively dissipating the heat of the magnetic tile 16. The guide vanes 5 can be directly formed on the outer peripheral surface of the rotor core 15, or can be installed on the outer peripheral side of the rotor core 15 through other structures. The guide vanes 5 are located in the air gap 3, which can prevent the guide vanes 5 from affecting the magnetic properties of the motor and ensure the working performance of the motor. Preferably, the guide vanes 5 are, for example, axial flow vanes, which are more convenient for introducing airflow into the axially extending air gap 3, which can better improve the flow efficiency of the airflow and the heat exchange efficiency between the airflow and the magnetic tile 16.

[0041] In this embodiment, the rotor assembly 1 further includes a sheath 6, which is sleeved on the outer peripheral side of the rotor core 15 and the magnetic tile 16, and the guide vane 5 is arranged on the outer peripheral surface of the sheath 6. The sheath 6 is sleeved on the outer peripheral side of the rotor core 15 and the magnetic tile 16, so that the guide vane 5 can be installed without damaging the structure of the rotor core 15. On the one hand, it can reduce the difficulty of processing the rotor core 15 and improve the structural performance of the rotor core 15 itself. On the other hand, it can also reduce the difficulty of processing the guide vane 5 and reduce the processing cost. The sheath 6 can be an interference fit with the rotor core 15 and the magnetic tile 16, which can improve the stability and reliability of the installation structure of the sheath 6.

[0042] Preferably, the inner surface of the jacket 6 fits with the outer surface of the magnetic tile 16, which can ensure that the jacket 6 and the magnetic tile 16 fit closely, improve the heat transfer performance between the jacket 6 and the magnetic tile 16, and thus transfer the heat of the magnetic tile 16 to the jacket 6. Since the area of ​​the jacket 6 is much larger than the area of ​​the magnetic tile 16, the heat exchange area between the magnetic tile 16 and the airflow can be effectively increased, further improving the heat dissipation performance of the magnetic tile 16. In order to ensure the heat dissipation effect of the magnetic tile 16, the jacket 6 is made of a material with good heat dissipation performance. At the same time, in order to avoid the jacket 6 from having an adverse effect on the magnetic properties of the motor, preferably, the jacket 6 is a non-magnetic material.

[0043] Preferably, the inner surface of the sheath 6 matches the outer surface structure of the magnetic tile 16 , which can further improve the fitting effect between the sheath 6 and the magnetic tile 16 , increase the contact area between the two, and improve the heat dissipation performance of the magnetic tile 16 .

[0044] In this embodiment, the guide vanes 5 extend along the axial direction of the rotor assembly 1, and can form a guide along the axial direction of the rotor assembly 1, so that after the airflow enters the air gap 3, it can be suppressed from flowing axially along the surface of the sleeve 6 under the action of the guide vanes 5, thereby more effectively removing the heat generated by the magnetic tile 16 during operation.

[0045] Preferably, the guide vanes 5 are arranged one-to-one with the magnetic tiles 16 along the circumference of the rotor assembly 1, which can not only ensure the axial flow guidance effect, but also further increase the heat dissipation contact area between the magnetic tiles 16 and the airflow through the guide vanes 5, thereby improving the heat dissipation performance of the magnetic tiles 16.

[0046] In an embodiment not shown in the figure, the guide vanes 5 are formed on the outer peripheral surface of the rotor core 15. In this embodiment, the sheath 6 is not required, and the guide vanes 5 are directly formed on the outer peripheral surface of the rotor core 15, so that the rotation of the rotor assembly 1 forms an axial airflow, accelerates the airflow on the surface of the magnetic tile 16, and improves the heat dissipation effect of the magnetic tile 16.

[0047] In an embodiment not shown in the figure, a guide groove for driving the airflow to form an axial flow is provided on the outer circumferential surface of the rotor core 15. The guide groove provided on the outer circumferential surface of the rotor core 15 can also form an axial drainage effect during the rotation of the rotor core 15, thereby generating an axial airflow flow and achieving effective heat dissipation of the magnetic tile 16.

[0048] The gas flow channel 4 includes an air outlet provided on the stator assembly 2, and the air outlet is connected to the air gap 3. After the airflow flows through the air gap 3 and exchanges heat with the magnetic tile 16, it can be blown out through the air outlet on the stator assembly 2, thereby realizing the circulation of the airflow, achieving continuous heat dissipation of the magnetic tile 16, and effectively ensuring the fluidity of the airflow. The air outlet can be provided close to the coil of the stator assembly 2, so that the heat generated by the coil can be taken away during the air outlet process, and the stator assembly 2 is effectively cooled. The cross-sectional shape of the air outlet can be circular, elliptical, rectangular or triangular, etc.

[0049] In one of the embodiments, the air outlet hole includes a radial hole 7 that radially penetrates the stator assembly 2, which makes it easier to process the air outlet hole from the outer peripheral side of the stator assembly 2 to the air gap 3, thereby achieving the discharge of airflow at the air gap 3.

[0050] In another embodiment, the air outlet hole includes a radial hole 7 and an axial hole 8, the radial hole 7 penetrates the stator assembly 2 in the radial direction, and the axial hole 8 penetrates the stator assembly 2 in the axial direction from the radial hole 7. In this embodiment, after the airflow enters the air gap 3, it reaches the air outlet hole and then flows radially along the air outlet hole. When the airflow flows to the junction of the radial hole 7 and the axial hole 8, part of the airflow flows out along the radial hole 7, and the other part of the airflow flows out along the axial hole 8, which can further improve the gas flow effect and avoid the problem of airflow blockage at the air gap 3.

[0051] In another embodiment, the radial hole 7 and the axial hole 8 can exist independently of each other. The axial hole 8 penetrates the stator assembly 2 axially along the end of the air gap 3, and the radial hole 7 penetrates the stator assembly 2 radially along the stator assembly 2, so that after the airflow enters the air gap 3, part of it flows out axially and part of it flows out radially, further improving the flow effect of the gas and improving the heat exchange effect with the magnetic tile 16.

[0052] Preferably, the distance between the central axis of the radial hole 7 and the end face of the air inlet end of the rotor assembly 1 is greater than 1 / 2 of the axial length of the air gap 3, thereby ensuring that after the airflow enters the air gap 3, it can flow through at least 1 / 2 of the axial length of the magnetic tile 16, thereby ensuring the heat dissipation effect on the magnetic tile 16.

[0053] In this embodiment, the permanent magnet motor further includes a control board 9, which is arranged outside the axial end surface of the rotor assembly 1, with the heat dissipation surface of the control board 9 facing the air gap 3, and the gas flow channel 4 flows through the control board 9. During the gas flow process, the gas can flow through the heat dissipation surface of the control board 9, thereby taking away the heat emitted by the heat dissipation surface of the control board 9, and effectively dissipating the heat of the control board 9.

[0054] Preferably, a radiator 10 is provided on the heat dissipation surface of the control board 9, and the radiator 10 is spaced apart from the rotor assembly 1 to form a gas flow channel 4. By providing the radiator 10 on the heat dissipation surface of the control board 9, the radiator 10 can increase the heat dissipation area of ​​the control board 9 and improve the heat dissipation effect of the controller.

[0055] Preferably, the side of the radiator 10 facing the air gap 3 is provided with a heat dissipation rib 11, and a convex structure can be formed on the surface of the radiator 10 to further increase the contact area between the radiator 10 and the airflow, thereby improving the heat exchange effect. The control board 9 can be fixed on the stator assembly 2 by screws or the like, or can be directly fixed and matched with the stator assembly 2 by snapping. The material of the heat dissipation rib 11 is preferably aluminum alloy, and an axial gap is left between the heat dissipation rib 11 and the rotor core 15, so as to effectively avoid the rotor edge rubbing during the operation of the motor, thereby ensuring the safety and reliability of the motor during operation.

[0056] The heat dissipation ribs can be arranged in various ways. For example, the heat dissipation ribs 11 can be arranged radially on the side of the radiator 10 with the rotating shaft of the rotor assembly 1 as the center. The heat dissipation ribs 11 are arranged radially, so that the airflow entering the motor can be guided from the center to the air gap on the peripheral side along the guidance of the heat dissipation ribs 11, which not only ensures that the airflow flows through the radiator 10 to the greatest extent to dissipate heat for the control board 9, but also ensures the rapid and smooth flow of the airflow, ensures the rapid circulation of the airflow, and improves the heat dissipation effect on the magnetic tile 16.

[0057] The heat dissipation ribs 11 can also extend circumferentially around the rotating axis of the rotor assembly 1 on the side of the radiator 10. In this structure, when the airflow flows through the heat dissipation ribs 11, a turbulent effect will be generated due to the flow resistance of the heat dissipation ribs 11, thereby improving the tumbling effect of the airflow, allowing the airflow to more fully exchange heat with the radiator 10, thereby improving the heat exchange efficiency.

[0058] Preferably, the heat dissipation ribs 11 extend in both the circumferential and axial directions relative to the central axis of the rotor assembly 1 on the side of the radiator 10, which can not only play an effective role in guiding the flow, but also increase the flow of the airflow, so that the airflow generates a certain degree of turbulence, thereby improving the heat exchange effect between the airflow and the radiator 10. There are multiple heat dissipation ribs 11, which are evenly spaced along the circumference of the radiator 10, which can further ensure the uniformity of heat dissipation.

[0059] The permanent magnet motor also includes an end cover 12, on which an air inlet 13 is provided, and the air inlet 13 is connected to the gas flow channel 4. The airflow enters the permanent magnet motor from the air inlet 13 on the end cover 12, then enters the air gap 3 through the gas flow channel 4, and then flows out from the air outlet. During this flow process, the gas exchanges heat with the control board 9 and the magnetic tile 16, forming a good heat dissipation effect on the control board 9 and the magnetic tile 16.

[0060] Preferably, an air induction cavity 14 is formed between the control board 9 and the end cover 12, and the gas flow channel 4 includes the air induction cavity 14, and the air induction cavity 14 is connected to the air inlet hole 13. The air induction cavity 14 is formed between the control board 9 and the end cover 12, so that the airflow enters the air induction cavity 14 after passing through the air inlet hole 13, instead of directly colliding with the control board 9. At the same time, the large space of the air induction cavity 14 can be used to introduce sufficient airflow from the outside, so that the air induction requirement of the guide blade 5 can be effectively met, and the problem of poor heat dissipation effect caused by insufficient airflow can be avoided.

[0061] When designing the motor, the corresponding fan jacket 6 needs to be processed. The outer surface of the jacket 6 is evenly distributed with arc-shaped guide blades 5, the number of which is 8 or 16. The inner surface of the jacket 6 fits the shape of the rotor core 15 and the magnetic tile 16, and the matching tolerance with the rotor is determined according to the maximum compressive strength that the magnetic tile 16 used can withstand.

[0062] After that, the rotor pressing tool is prepared, and the sleeve 6 is vertically pressed into the outer periphery of the rotor core 15 and the magnetic tile 16 to achieve the installation and positioning of the sleeve 6.

[0063] According to the design requirements, the corresponding radiator 10 is processed. The radiator 10 is made of aluminum alloy or a metal with similar heat dissipation capacity and processing plasticity to aluminum alloy. The surface protrusions are streamlined protrusions and have threaded holes that match the control board 9.

[0064] Prepare the mold, inject plastic or other cushioning material into the mold, and complete the stator injection molding.

[0065] Connect the radiator 10 and the control board 9 together with screws, and finally complete the motor assembly.

[0066] According to an embodiment of the present application, the compressor includes a permanent magnet motor, which is the permanent magnet motor mentioned above.

[0067] According to an embodiment of the present application, the air conditioner includes a permanent magnet motor, which is the permanent magnet motor mentioned above.

[0068] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0069] The above are only 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 principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A permanent magnet motor, characterized in that: The permanent magnet motor comprises a rotor assembly (1) and a stator assembly (2), an air gap (3) being formed between the rotor assembly (1) and the stator assembly (2), the rotor assembly (1) comprising a rotor core (15) and a magnetic tile (16) arranged on the outer peripheral side of the rotor core (15), the permanent magnet motor further comprising a gas flow channel (4), the gas flow channel (4) being connected to the air gap (3), the air flow passing through the gas flow channel (4) and the air gap (3) exchanging heat with the magnetic tile (16), and the outer peripheral side of the rotor core (15) is also provided with a guide vane (5) for guiding the air flow; The permanent magnet motor further comprises a control plate (9), the control plate (9) being arranged outside the axial end surface of the rotor assembly (1), the heat dissipation surface of the control plate (9) facing the air gap (3), and the gas flow channel (4) flowing through the control plate (9); A radiator (10) is provided on the heat dissipation surface of the control plate (9), and the radiator (10) is spaced apart from the rotor assembly (1) to form the gas circulation channel (4).

2. The permanent magnet motor according to claim 1, characterized in that: The guide blade (5) is an axial flow blade.

3. The permanent magnet motor according to claim 2, characterized in that: The rotor assembly (1) further comprises a sleeve (6), wherein the sleeve (6) is sleeved on the outer peripheral side of the rotor core (15) and the magnetic tile (16), and the guide vane (5) is arranged on the outer peripheral surface of the sleeve (6).

4. The permanent magnet motor according to claim 3, characterized in that: The inner surface of the sheath (6) is in contact with the outer surface of the magnetic tile (16).

5. The permanent magnet motor according to claim 4, characterized in that: The inner surface of the sheath (6) matches the outer surface structure of the magnetic tile (16).

6. The permanent magnet motor according to claim 3, characterized in that: The guide vanes (5) extend in the axial direction of the rotor assembly (1).

7. The permanent magnet motor according to claim 6, characterized in that: The guide vanes (5) are arranged in a one-to-one correspondence with the magnetic tiles (16) along the circumferential direction of the rotor assembly (1).

8. The permanent magnet motor according to claim 2, characterized in that: The guide vanes (5) are formed on the outer peripheral surface of the rotor core (15).

9. The permanent magnet motor according to any one of claims 1 to 8, characterized in that: The gas circulation channel (4) comprises an air outlet hole arranged on the stator assembly (2), and the air outlet hole is connected to the air gap (3).

10. The permanent magnet motor according to claim 9, characterized in that: The air outlet hole comprises a radial hole (7) which penetrates the stator assembly (2) in the radial direction.

11. The permanent magnet motor according to claim 9, characterized in that: The air outlet hole comprises a radial hole (7) and an axial hole (8); the radial hole (7) penetrates the stator assembly (2) in the radial direction; and the axial hole (8) penetrates the stator assembly (2) in the axial direction from the radial hole (7).

12. The permanent magnet motor according to claim 1, characterized in that: The side of the heat sink (10) facing the air gap (3) is provided with heat dissipation ribs (11).

13. The permanent magnet motor according to claim 12, characterized in that: The heat dissipation ribs (11) are arranged radially on the side of the radiator (10) with the rotation axis of the rotor assembly (1) as the center; or, the heat dissipation ribs (11) extend circumferentially around the rotation axis of the rotor assembly (1) on the side of the radiator (10).

14. The permanent magnet motor according to claim 12, characterized in that: The heat dissipation ribs (11) extend on the side of the heat sink (10) in both the circumferential direction and the axial direction relative to the central rotation axis of the rotor assembly (1).

15. The permanent magnet motor according to claim 1, characterized in that: The permanent magnet motor further comprises an end cover (12), the end cover (12) being provided with an air inlet hole (13), the air inlet hole (13) being in communication with the gas circulation channel (4).

16. The permanent magnet motor according to claim 15, characterized in that: An air induction cavity (14) is formed between the control panel and the end cover (12); the gas circulation channel (4) includes the air induction cavity (14); and the air induction cavity (14) is in communication with the air inlet hole (13).

17. The permanent magnet motor according to claim 10 or 11, characterized in that: The distance between the central axis of the radial hole (7) and the air inlet end surface of the rotor assembly (1) is greater than 1 / 2 of the axial length of the air gap (3).

18. A compressor, comprising a permanent magnet motor, characterized in that: The permanent magnet motor is the permanent magnet motor according to any one of claims 1 to 17.

19. An air conditioner, comprising a permanent magnet motor, characterized in that: The permanent magnet motor is the permanent magnet motor according to any one of claims 1 to 17.

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