Heat dissipation structure of magnetic suspension permanent magnet synchronous motor

Abstract

The invention belongs to the technical field of magnetic suspension synchronous motors, and particularly relates to a magnetic suspension permanent magnet synchronous motor heat dissipation structure which comprises a shell, a stator part, a rotor part, a front end cover plate, a rear end cover plate, an air inlet and an air outlet, the front end cover plate and the rear end cover plate are connected to the two sides of the shell in the length direction respectively, the air inlet is formed in the rear end cover plate, and the air outlet is formed in the rear end cover plate. The rear end cover plate is provided with a first heat dissipation hole and a second heat dissipation hole, the second heat dissipation hole is connected with a heat dissipation channel, the heat dissipation channel is arranged in the shell, the position, close to the front end cover plate, of the heat dissipation channel is connected with a front end air outlet hole, the air outlet is formed in the shell, and the air outlet is connected with a one-way valve. Compared with the prior art, the heat dissipation area of the shell can be increased, internal cold air circulation is smoother, the heat dissipation efficiency is improved, and the size of the motor is reduced through the built-in heat dissipation channel.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension synchronous motors, and in particular to a heat dissipation structure of a magnetic suspension permanent magnet synchronous motor. Background Art

[0002] As the application market of magnetic levitation motors grows, manufacturers have increasingly stringent requirements on motor performance. One of the important test performances is the strength of the motor's heat dissipation, which is related to the magnetic force of the permanent magnets inside the motor and the control accuracy of the magnetic levitation bearings.

[0003] Today's permanent magnet synchronous motors have two heat dissipation channels. The first heat dissipation channel uses the air entering the rear end of the motor to dissipate heat for the rear end of the radial magnetic bearing and the stator coil, so that the cooling wind entering from the rear end flows through the magnetic bearing and the stator coil, and then is discharged from the heat dissipation port of the motor. The second heat dissipation channel connects the ventilation duct to allow the air from the rear end to dissipate heat for the front end of the radial magnetic bearing, and finally is discharged from the heat dissipation port of the motor. Although there are currently two heat dissipation channels, the cooling effect is not significant, and the temperature of the motor itself and the temperature of the front and rear ends of the magnetic bearing are still very high. The main reason is that the heat dissipation channel area of ​​the stator shell is not large. When the motor is dissipating heat, if the external cooling wind speed is also slow, the heat dissipation effect and efficiency of the magnetic levitation motor will be greatly reduced. Another reason is that the ventilation gap between the stator and the inside of the shell and the air gap between the stator and the rotor are very small. The cold air entering from the tail end is difficult to circulate into the magnetic bearing, which will have a great impact on the performance of the motor itself. A separate ventilation pipe is installed on the shell, which affects its appearance and is not easy to install. In addition, in the existing motor, the air gap between the rotor and the stator coil is relatively small, which not only affects the heat dissipation, but also causes the torque output to decrease and the mechanical loss to increase. Therefore, it is very important to optimize the heat dissipation channel of the magnetic levitation motor. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention develops a magnetic levitation permanent magnet synchronous motor heat dissipation structure, which can increase the heat dissipation area of ​​the shell, make the internal cold air flow smoother, improve the heat dissipation efficiency, improve the aesthetics through the built-in heat dissipation channel, and reduce the size of the motor.

[0005] The technical solution to the technical problem solved by the present invention is: a magnetic levitation permanent magnet synchronous motor heat dissipation structure, comprising a shell, a stator part and a rotor part, the rotor part rotates inside the shell, the stator part is arranged around the rotor part and installed inside the shell, radial magnetic bearings are arranged on both sides of the stator part, and an axial magnetic bearing is arranged between the radial magnetic bearing and the stator part; it also includes a front end cover plate, a rear end cover plate, an air inlet and an air outlet, the front end cover plate and the rear end cover plate are respectively connected on both sides of the length direction of the shell, the air inlet is arranged on a side of the shell close to the rear end cover plate, the rear end cover plate is provided with a first heat dissipation hole and a second heat dissipation hole, the second heat dissipation hole is connected to a heat dissipation channel, the heat dissipation channel is arranged inside the shell, the heat dissipation channel is connected to a front air outlet near the front end cover plate, the air outlet is arranged on the shell, and the air outlet is connected to a one-way valve.

[0006] Preferably, the air outlet is arranged on one side of the stator portion of the shell and close to the top of the shell.

[0007] Preferably, the second heat dissipation hole is square, and the cross-sectional shape of the heat dissipation channel is a square corresponding to the second heat dissipation hole.

[0008] Preferably, the heat dissipation channels are arranged in an array, and the second heat dissipation holes and the front air outlet holes are arranged in a corresponding array.

[0009] Preferably, two heat dissipation channels are provided.

[0010] Preferably, a thermal insulation layer is provided inside the heat dissipation channel.

[0011] Preferably, a gap air duct is provided between the stator part and the rotor part.

[0012] Preferably, the gap of the gap air duct is 4-5 mm.

[0013] Preferably, axial heat dissipation teeth are provided on the housing near the stator portion.

[0014] Preferably, the first heat dissipation holes are arranged in an array on the rear end cover plate.

[0015] The effects provided in the content of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solution has the following advantages or beneficial effects: 1. By setting the second heat dissipation hole in conjunction with the heat dissipation channel and the front air outlet hole, the cold air can be introduced into the front end of the motor inside the shell, avoiding the need to set a connecting pipe outside. The hidden design improves the overall aesthetics of the motor, while also shortening the path for the cold air to reach the front end of the motor, resulting in higher operating efficiency; 2. The present invention is designed with two sets of heat dissipation ducts. The first set of heat dissipation ducts enters the interior of the shell through the first heat dissipation hole, then passes through the rear radial magnetic bearing and the gap duct to reach the air outlet, and the second set of heat dissipation ducts passes through the second heat dissipation hole to reach the front air outlet of the shell, then passes through the front radial magnetic bearing and the axial magnetic bearing to reach the air outlet; wherein, the second set of heat dissipation ducts can increase the air volume entering the front end and improve the heat dissipation effect of the front end by setting two heat dissipation channels. Too many heat dissipation channels will also affect the air volume entering the rear end from the first heat dissipation hole for heat dissipation, so that the entire heat dissipation system will not affect the air volume at the rear end while increasing the air volume at the front end; 3. By setting a temperature insulation layer inside the heat dissipation channel, the heat generated during the operation of the motor can be prevented from being transferred from the shell to the inside of the heat dissipation channel, ensuring that the air reaching the front end is still cold air, thereby improving the heat dissipation effect; 4. Since it is necessary to ensure that the amount of cold air entering the front end is not too small, the second heat dissipation hole requires a larger air intake than the first heat dissipation hole, and the flow rate of the second heat dissipation hole is greater than that of the first heat dissipation hole. The internal space of the shell is small, and the use of square holes can save space more reasonably, which is conducive to reducing the size of the motor; 5. By setting the air outlet at the top, there will be no obstruction during exhaust, and the exhaust will be smoother. At the same time, a one-way valve is set, which is in a closed state when the internal pressure of the motor is less than or equal to the external pressure, which can prevent external dust and other debris from entering the motor. It will automatically open when the internal pressure of the motor is higher than the external pressure; 6. By setting the first heat dissipation hole array, multiple groups of first heat dissipation holes will not generate turbulence when air enters, thereby affecting the heat dissipation effect, while also ensuring the air intake pressure for rear end heat dissipation; 7. By setting a gap air duct between the stator and the rotor, the distance between the stator and the rotor is adjusted. If the gap air duct spacing is too small, it will affect the heat dissipation and cause the torque output to decrease. If the gap air duct spacing is too large, it will also cause loud noise and vibration. Therefore, the gap air duct spacing is set to 4-5mm, which is convenient for the circulation of internal cold air on the one hand, and reduces mechanical loss on the other hand, improves the efficiency of the motor and can also ensure a good mute effect; 8. By setting axial heat dissipation teeth, under the condition of the same outer surface area of ​​the motor housing, the heat dissipation area is increased by 18.6% compared with the traditional annular heat dissipation teeth, and the heat dissipation effect is better; at the same time, if the motor itself is not equipped with air cooling, annular heat dissipation teeth are suitable, but in the case of axial air cooling, the heat is transferred along the axial direction. The setting of axial heat dissipation teeth can directly guide the heat to flow along the axial direction and dissipate, which can further improve the heat dissipation effect, and the axial heat dissipation tooth structure is relatively simple, and the manufacturing process difficulty and cost are low, which is conducive to reducing the overall manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a front view of the present invention; Figure 2 This is a cross-sectional view of the rear end cover plate of the present invention; Figure 3 for Figure 2 Sectional view in the AA direction; Figure 4 for Figure 2 Cross-sectional view in the BB direction; Figure 5 This is a cross-sectional view of the front end cover plate of the present invention; Figure 6 Calculation of the outer surface of the annular heat dissipation gear housing Figure 1 ; Figure 7 Calculation of the outer surface of the annular heat dissipation gear housing Figure 2 ; Figure 8 This is the calculation diagram of the surface area of ​​a single tooth of the annular heat dissipation tooth; Fig. 9 Calculation of the outer surface of the gear housing for axial heat dissipation Figure 1 ; Fig.10 Calculation of the outer surface of the gear housing for axial heat dissipation Figure 2 ; Fig.11 This is the calculation diagram of the surface area of ​​a single tooth of the axial heat dissipation tooth.

[0017] Among them: 1. Shell; 101. Axial heat dissipation teeth; 2. Air inlet; 3. Rear cover; 31. First heat dissipation hole; 32. Second heat dissipation hole; 4. Heat dissipation channel; 41. Front air outlet; 5. Front cover; 6. Stator part; 7. Rotor part; 8. Radial magnetic bearing; 9. Axial magnetic bearing; 10. Air outlet; 11. One-way valve; 12. Gap air duct. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0019] Example 1 See also Figures 1 to 11, a heat dissipation structure of a magnetic levitation permanent magnet synchronous motor, comprising a shell 1, a stator part 6 and a rotor part 7, wherein the rotor part 7 rotates inside the shell 1, the stator part 6 is arranged around the rotor part 7 and is installed inside the shell 1, radial magnetic bearings 8 are arranged on both sides of the stator part 6, and an axial magnetic bearing 9 is arranged between the radial magnetic bearing 8 and the stator part 6; it also includes a front end cover plate 5, a rear end cover plate 3, an air inlet 2 and an air outlet 10, wherein the front end cover plate 5 and the rear end cover plate 3 are respectively connected to both sides of the length direction of the shell 1, the air inlet 2 is arranged on one side of the shell 1 close to the rear end cover plate 3, a first heat dissipation hole 31 and a second heat dissipation hole 32 are arranged on the rear end cover plate 3, and a heat dissipation channel 4 is connected to the second heat dissipation hole 32, the heat dissipation channel 4 is arranged inside the shell 1, and a front end air outlet 41 is connected to the heat dissipation channel 4 close to the front end cover plate 5, the air outlet 10 is arranged on the shell 1, and a one-way valve 11 is connected to the air outlet 10.

[0020] like Figure 1 , Figure 3 and Figure 4 As shown, the air outlet 10 is arranged on one side of the stator portion 6 of the housing 1 and close to the top of the housing 1 .

[0021] like Figure 2 and Figure 3 The second heat dissipation hole 32 is a square, and the cross-sectional shape of the heat dissipation channel 4 is a square corresponding to the second heat dissipation hole 32 .

[0022] like Figure 2 , Figure 3 and Figure 5 As shown, the heat dissipation channels 4 are arranged in an array, and the second heat dissipation holes 32 and the front air outlet holes 41 are arranged in an array correspondingly.

[0023] like Figure 2 As shown, two heat dissipation channels 4 are provided, and a heat preservation and insulation layer is provided inside the heat dissipation channel 4 .

[0024] like Figure 4 As shown, a gap air duct 12 is provided between the stator part 6 and the rotor part 7 .

[0025] like Figure 4 As shown, the gap of the gap air duct 12 is 4-5 mm.

[0026] like Figure 1 As shown, axial heat dissipation teeth 101 are provided on the housing 1 near the stator part 6 .

[0027] like Figure 1 As shown, the first heat dissipation holes 31 are arranged in an array on the rear end cover plate 3 .

[0028] How it works The present invention designs two sets of heat dissipation duct systems to meet the heat dissipation requirements under complex working conditions and ensure that the equipment can operate stably and efficiently for a long time. Among them, the cold air of the first set of heat dissipation ducts flows in through the first heat dissipation hole 31. After the airflow enters the interior of the shell 1, it flows through the rear radial magnetic bearing 8 immediately, quickly takes away the heat, and after passing through the rear radial magnetic bearing 8, the airflow turns into the gap duct 12. Here, the airflow fully exchanges heat with the stator part 6 and the rotor part 7, carrying more heat to the air outlet 10, and finally discharges to complete a complete heat dissipation cycle; at the same time, the second set of heat dissipation ducts operates synchronously, and the airflow first flows in through the second heat dissipation hole 32. When the airflow reaches the front air outlet 41, the airflow flows through the front radial magnetic bearing 8 along a predetermined route. After completing the heat dissipation task of the front radial magnetic bearing 8, the airflow flows through the axial magnetic bearing 9 area, fully absorbs the heat, and is discharged through the air outlet 10 to complete a complete heat dissipation cycle.

[0029] The present invention is used in conjunction with a blowing device at the air inlet 2. When the motor is running, the air inlet 2 of the rear cover plate 3 serves as the entrance of cold air for the entire heat dissipation system and begins to introduce outside air. Since the flow rate of the second heat dissipation hole 32 is designed to be large, it can meet the air volume requirement for front-end heat dissipation. Part of the cold air directly enters the motor from the first heat dissipation hole 31, and part of it enters the front end of the motor through the heat dissipation channel 4. The cold air entering the rear end cover plate 3 is then dispersed inside the shell 1, and part of the cold air directly exchanges heat with the rear end of the stator part 6 and the part of the radial magnetic bearing 8 close to the rear end. In this process, the temperature of the cold air rises after absorbing heat, and then it is discharged through the air outlet 10. Due to the array layout of the first heat dissipation hole 31, the airflows between the holes interfere with each other very little when the air is entering, and the air inlet pressure in the rear end area can be stably maintained, ensuring that the rear end heat dissipation process is carried out continuously and efficiently, and preventing local overheating or uneven heat dissipation caused by airflow turbulence.

[0030] At the same time, another part of the cold air flows to the front air outlet 41 through the heat dissipation channel 4 and reaches the front end of the motor. There are two heat dissipation channels 4 and they are distributed in an array. This design effectively increases the flow of cold air entering the front end of the motor on the basis of ensuring that the first heat dissipation hole 31 at the rear end has sufficient air intake. The cross-sectional shape of the heat dissipation channel 4 is a square corresponding to the square second heat dissipation hole 32. Such a design is conducive to optimizing the air flow path within the limited space inside the shell 1 and saving the limited space inside the shell 1. In addition, during the operation of the motor, the stator part 6, the rotor part 7 and the shell 1 itself will generate a large amount of heat in the thermal insulation layer inside the heat dissipation channel 4. The thermal insulation layer can effectively prevent the heat from being transferred to the cold air in the heat dissipation channel 4, so that the air entering the front cover plate 5 always maintains a low temperature, thereby being able to efficiently take away the heat from the front end area of ​​the motor, including the heat near the front end of the stator part 6, the axial magnetic bearing 9 and the front cover plate 5, thereby achieving effective heat dissipation of the front end of the motor.

[0031] A gap air duct 12 is provided between the stator part 6 and the rotor part 7, and the gap thereof is 4-5mm. When the rotor part 7 rotates at high speed, it will also drive the air flow in the gap air duct 12 to a certain extent, forming air disturbance. This disturbance can enhance the heat transfer efficiency between the surface of the stator part 6 and the rotor part 7 and the air, so that the heat generated by the stator part 6 and the rotor part 7 during operation can be quickly absorbed and taken away by the air, further improving the heat dissipation effect of the core components inside the motor. In traditional permanent magnet motors, the air gap between the rotor and stator coils is generally designed to be between 0.5mm-3mm, the air gap is relatively small, and the torque output cannot meet the requirements of high speed. The high-speed magnetic levitation motor optimized this time has a high internal speed. If the air gap is still designed as 0.5-3mm, it may cause friction between the rotor and the stator, increase mechanical losses, and thus increase the temperature. Therefore, in order to further meet the performance requirements and reduce the temperature rise of the motor, the relationship between the rotor, stator and air gap is studied to reasonably obtain the value of the air gap (the relationship between the air gap δ and the rotor outer diameter D2 and the stator inner diameter D1: D2=D1-2δ). The air gap size is designed to be 4-5mm. Compared with traditional fans, on the one hand, it strengthens the circulation of internal cold air and facilitates the heat dissipation of the motor. On the other hand, it also reduces mechanical losses and improves the efficiency of the motor.

[0032] When the motor is running, the axial heat dissipation teeth 101 arranged near the stator part 6 on the shell 1 will transfer heat in the axial direction due to the axial air-cooling heat dissipation mechanism. The axial heat dissipation teeth 101 can directly guide the heat to flow quickly in the axial direction and dissipate to the surrounding environment. Compared with the traditional annular heat dissipation teeth, under the condition of the same outer surface area of ​​the shell 1 and the use of heat dissipation teeth of the same specification, the motor heat dissipation area of ​​the axial heat dissipation teeth 101 is increased by 18.6%, which means that it can dissipate more heat per unit time. Moreover, the structure of the axial heat dissipation teeth 101 is relatively simple, and the manufacturing process difficulty and cost are relatively low, which is not only conducive to improving the heat dissipation efficiency, but also can reduce the overall manufacturing cost of the motor.

[0033] like Figures 6 to 11 , the heat dissipation area of ​​the axial heat dissipation tooth 101 and the annular heat dissipation tooth under the same size motor conditions is compared: The outer surface diameter of the shell 1 where the axial heat dissipation teeth 101 are located is approximately 350mm, and the heat dissipation teeth occupy approximately 245mm of the length of the shell 1; the outer surface diameter of the shell 1 where the annular heat dissipation teeth are located is approximately 345mm, and the heat dissipation teeth occupy approximately 160mm of the length of the shell 1.

[0034] (1) Original heat dissipation area: area of ​​heat dissipation channel 4 + outer surface of shell 1: The software calculated: S1 = 106093 (mm 2 )。 S2 = 44200 (mm) 2); S3 = 35830 (mm 2 ); Where: S1 and S2 are the outer surface areas of the shell 1, and S3 is the single tooth heat dissipation area of ​​the annular heat dissipation tooth. Figure 6 The shaded area of ​​S2 is shown in Figure 7 The shaded area, S3 area range is shown in Figure 8 Shaded part.

[0035] Heat dissipation channel 4 area: S1 pass = 3.14 × 14.52 = 660.185 (mm 2 ) Shell 1 outer surface: S1 outer = S1 + S2 + S3 * 8 = 106093 + 44200 + 35830 * 8 (ring teeth total 8 teeth) = 436933 (mm 2 ) Original total heat dissipation area: S original = S1 through + S1 outside = 660.185 + 436933 ≈ 437593 (mm 2 ) (2) Current heat dissipation area: optimized heat dissipation channel 4 + optimized outer surface of shell 1: The software calculated: S4 = 94832 (mm 2 ); S5 = 31432 (mm 2 ); S6 = 11530 (mm 2 ); Where: S4 and S5 are the outer surface areas of the housing 1, and S6 is the single tooth heat dissipation area of ​​the axial heat dissipation tooth 101. Fig. 9 The middle shaded area, S5 area range is shown in Fig.10 The shaded area, S6 area range is shown in Fig.11 Shaded part.

[0036] After optimization, the area of ​​heat dissipation channel 4 is: S2 = 3.14 × 7.52 × 2 + 11 × 15 = 518.25 (mm 2 ) The outer surface area of ​​the optimized shell 1 is: S2 outer = S4 + S5 + S6 * 34 = 94832 + 31432 + 11530 * 34 (the control part is approximately divided into 34 teeth) = 518284 (mm 2 ) Total heat dissipation area: S current = S2 through + S2 outside = 518.25 + 518284 ≈ 518802 (mm 2 ) The heat dissipation area is increased compared with the original: (S current - S original) / S original * 100% = (518802-437593) / 437593 * 100% = 18.6%.

[0037] The air outlet 10 located on the side of the stator part 6 on the housing 1 near the top position is used to remove hot air during the heat dissipation process. When the internal pressure of the motor is higher than the external pressure due to the continuous generation and accumulation of heat, the one-way valve 11 installed at the air outlet 10 will automatically open. At this time, under the action of the pressure difference, the hot air is discharged from the top air outlet 10 along the direction guided by the axial heat dissipation teeth 101. Since the top position is relatively open in the motor structure, the hot air will hardly be hindered when it is discharged, thereby ensuring the high efficiency of the exhaust process. When the internal pressure of the motor is less than or equal to the external pressure, the one-way valve 11 will close quickly to form a reliable barrier to effectively prevent foreign matter such as dust and impurities in the external environment from entering the motor. This feature is crucial to keeping the inside of the motor clean. It can avoid the influence of dust accumulation on the heat dissipation performance of the motor, and also reduce the wear and damage of dust to the precision parts inside the motor, ensuring the stable operation and long-term reliability of the motor, so that the heat dissipation system can play a role continuously and effectively, and maintain the motor in a suitable temperature range.

[0038] In this solution, the heat of the axial heat dissipation teeth 101 is mainly concentrated at the two axial ends. The end of the axial heat dissipation teeth 101 away from the air outlet 10 is the cold air inlet end and will not accumulate a lot of heat. The side close to the air outlet 10 will not accumulate a lot of heat due to the strong internal cold air flow.

[0039] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A heat dissipation structure of a magnetically suspended permanent magnet synchronous motor, comprising a housing (1), a stator portion (6) and a rotor portion (7), wherein the rotor portion (7) rotates inside the housing (1), the stator portion (6) is arranged around the rotor portion (7) and is installed inside the housing (1), radial magnetic bearings (8) are arranged on both sides of the stator portion (6), and an axial magnetic bearing (9) is arranged between the radial magnetic bearing (8) and the stator portion (6); characterized in that: The air inlet (2) and the air outlet (10) are also included. The front cover plate (5) and the rear cover plate (3) are respectively connected to both sides of the shell (1) in the length direction. The air inlet (2) is arranged on a side of the shell (1) close to the rear cover plate (3). The rear cover plate (3) is provided with a first heat dissipation hole (31) and a second heat dissipation hole (32). The second heat dissipation hole (32) is connected to a heat dissipation channel (4). The heat dissipation channel (4) is arranged inside the shell (1). The heat dissipation channel (4) is connected to a front air outlet (41) at a position close to the front cover plate (5). The air outlet (10) is arranged on the shell (1). The air outlet (10) is connected to a one-way valve (11).

2. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 1, characterized in that: The air outlet (10) is arranged on one side of the stator portion (6) on the shell (1) at a position close to the top of the shell (1).

3. The heat dissipation structure of a magnetic levitation permanent magnet synchronous motor according to claim 1, characterized in that: The second heat dissipation hole (32) is square, and the cross-sectional shape of the heat dissipation channel (4) is a square corresponding to the second heat dissipation hole (32).

4. The heat dissipation structure of a magnetic levitation permanent magnet synchronous motor according to claim 1, characterized in that: The heat dissipation channels (4) are arranged in an array, and the second heat dissipation holes (32) and the front air outlet holes (41) are arranged in an array correspondingly.

5. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 4, characterized in that: The heat dissipation channels (4) are provided with two.

6. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 1, characterized in that: A heat-insulating layer is provided inside the heat dissipation channel (4).

7. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 1, characterized in that: A gap air duct (12) is provided between the stator part (6) and the rotor part (7).

8. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 7, characterized in that: The gap of the gap air duct (12) is 4-5 mm.

9. The heat dissipation structure of a magnetic suspension permanent magnet synchronous motor according to claim 1, characterized in that: Axial heat dissipation teeth (101) are provided on the housing (1) at a position close to the stator portion (6).

10. The heat dissipation structure of a magnetic levitation permanent magnet synchronous motor according to claim 1, characterized in that: The first heat dissipation holes (31) are arranged in an array on the rear end cover plate (3).

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