Magnetic levitation motor, magnetic levitation centrifugal air compressor

Abstract

This invention provides a magnetic levitation motor and a magnetic levitation centrifugal air compressor. The magnetic levitation motor includes a motor housing, within which a motor stator and a motor rotor are housed. The two ends of the motor rotor are rotatably connected to the motor housing via magnetic levitation bearings. The motor stator includes a back-wound winding, and a magnetic isolation and cooling component is disposed between the end of the back-wound winding and the adjacent magnetic levitation bearing. This invention effectively prevents the magnetic isolation and cooling component from transferring heat to adjacent components after heating. Therefore, the distance between the magnetic levitation bearing and the motor stator can be reduced, the shaft length can be further decreased, and the rotor's fixed frequency can be increased to improve the upper limit of the rotor's speed. Simultaneously, the adverse effects of the stator's magnetic field and thermal radiation on the magnetic levitation bearing are effectively eliminated, improving the operational reliability of the magnetic levitation bearing.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to a magnetic levitation motor and a magnetic levitation centrifugal air compressor. Background Technology

[0002] With the continuous development of high-speed magnetic levitation motor system technology, these systems are increasingly being applied to equipment in various environments and fields. When applied to high-speed magnetic levitation centrifugal air compressors, higher rotational speeds are needed to achieve higher compressed gas pressures. However, achieving high speeds is limited by factors such as overall shaft clearance, fixed frequency, and rotor dynamics strength, requiring targeted designs for the motor shaft strength, winding method, and magnetic bearing structure. Simultaneously, high-speed magnetic levitation compressors are characterized by high efficiency, small size, compact structure, and high power density, but correspondingly, heat loss is concentrated, resulting in high internal temperature rise. Cooling methods such as water cooling, air cooling, and refrigerant are needed to dissipate heat from the motor, but the available cooling methods for air compressors are limited. To improve the overall operating speed and fixed frequency of the compressor, and enhance the overall heat dissipation effect of the magnetic levitation centrifugal air compressor, a comprehensive design optimization of the entire high-speed motor system is required, along with a completely new compressor system cooling structure to meet these requirements. To effectively shorten the rotor length, existing technologies employ motors with back-wound stator windings, which can effectively reduce the overall volume of motor components and achieve the goal of reducing the rotor shaft length. However, the inventors found in actual tests that the back-wound stator emits stronger heat radiation to the surroundings, and the alternating magnetic field it generates can also seriously affect other components near the stator windings, such as magnetic bearings (where eddy currents heat up within the bearing stator core). Without special treatment, the back-wound motor stator needs to maintain sufficient distance from nearby magnetic bearings to reduce the heat radiation and magnetic field influence of the back-wound windings on the magnetic bearings. This approach obviously results in the rotor shaft length (i.e., rotor length) still being too long, and the shaft frequency and rotor dynamic strength are both too low, limiting the speed of the motor or compressor. Summary of the Invention

[0003] Therefore, the present invention provides a magnetic levitation motor and a magnetic levitation centrifugal air compressor, which can solve the technical problem in the prior art that in order to avoid the thermal radiation and magnetic field of the motor stator in the motor or compressor with back-wound stator winding during operation causing the temperature of the adjacent magnetic levitation bearing to be too high, resulting in a large gap between the motor stator and the magnetic levitation bearing, thus causing the shaft length to still be too large.

[0004] To address the aforementioned problems, the present invention provides a magnetic levitation motor, comprising a motor housing, a motor stator and a motor rotor disposed within the motor housing, the two ends of the motor rotor being rotatably connected to the motor housing via magnetic levitation bearings, the motor stator comprising a back-wound winding, and a magnetic isolation and cooling component disposed between the end of the back-wound winding and the adjacent magnetic levitation bearing.

[0005] In some embodiments, the magnetic shielding and cooling component is gap-fitted onto the shaft of the motor rotor and connected to the motor housing, and the magnetic shielding and cooling component has a first cooling channel constructed inside.

[0006] In some embodiments, a second cooling channel is constructed within the motor housing, the first cooling channel having an inlet and an outlet, wherein the cooling medium in the second cooling channel can enter the first cooling channel through the inlet and flow back to the second cooling channel through the outlet.

[0007] In some embodiments, a plurality of baffles are provided at intervals within the first cooling channel so that the cooling medium entering through the inlet flows to the outlet through the intervals between the plurality of baffles.

[0008] In some embodiments, the magnetically shielded cooling component includes a first plate and a second plate, the turbulence column is disposed on a first side of the first plate, and the second plate is fastened to the first side to form the first cooling channel between the first plate and the second plate.

[0009] In some embodiments, the inner peripheral wall of the motor housing has a mounting protrusion extending radially inward therein, the magnetic levitation bearing is assembled on a first side of the mounting protrusion, and the magnetic isolation and cooling component is assembled on a second side of the mounting protrusion; and / or, the magnetic isolation and cooling component is made of an iron-nickel alloy material.

[0010] The present invention also provides a magnetic levitation centrifugal air compressor, including an air compressor housing, a motor stator and a motor rotor are provided inside the air compressor housing, the two ends of the motor rotor are rotatably connected to the air compressor housing through magnetic levitation bearings, the motor stator includes a back-wound winding, and a magnetic isolation and cooling component is provided between the end of the back-wound winding and the adjacent magnetic levitation bearing.

[0011] In some embodiments, the magnetic shielding and cooling component is gap-fitted onto the shaft of the motor rotor and connected to the air compressor housing, and the magnetic shielding and cooling component has a first cooling channel constructed inside.

[0012] In some embodiments, a second cooling channel is constructed within the air compressor housing, the first cooling channel having an inlet and an outlet, wherein the cooling medium in the second cooling channel can enter the first cooling channel via the inlet and flow back to the second cooling channel via the outlet.

[0013] In some embodiments, the first end of the air compressor housing is connected to a first-stage collector corresponding to the first-stage impeller. The air compressor housing has an air outlet and an air inlet communicating with the external environment. The first-stage collector has a guide port communicating with its inlet. The guide port is connected to the air outlet through a guide pipe.

[0014] In some embodiments, the inner peripheral wall of the air compressor housing has a mounting protrusion extending radially inward therein, the magnetic levitation bearing is assembled on a first side of the mounting protrusion, and the magnetically shielding and cooling component is assembled on a second side of the mounting protrusion; and / or, the magnetically shielding and cooling component is made of an iron-nickel alloy material.

[0015] In some embodiments, magnetic isolation and cooling components are provided at both ends of the motor stator, namely a first magnetic isolation and cooling component and a second magnetic isolation and cooling component. The first magnetic isolation and cooling component is located at the end of the motor stator closer to the first-stage impeller, and the second magnetic isolation and cooling component is located at the end of the motor stator away from the first-stage impeller. The air outlet is constructed on the air compressor housing at a position corresponding to the area between the first magnetic isolation and cooling component and the motor stator, and the air inlet is constructed on the air compressor housing at a position corresponding to the area on the side of the air compressor housing away from the motor stator of the second magnetic isolation and cooling component.

[0016] This invention provides a magnetic levitation motor and a magnetic levitation centrifugal air compressor. The latter employs a back-wound winding to reduce shaft length and incorporates a magnetically shielded cooling component between the magnetic levitation bearing and the back-wound winding. This allows the electromagnetic eddy currents generated during operation by the back-wound winding and the magnetic bearing to generate heat within the magnetically shielded cooling component. Simultaneously, the cooling effect of the component carries away and dissipates this heat, effectively preventing the component from transferring heat to adjacent components after heating. This allows for a smaller distance between the magnetic levitation bearing and the motor stator, further reducing shaft length. Increasing the rotor's fixed frequency helps raise the upper limit of rotor speed. Furthermore, it effectively eliminates the adverse effects of the stator magnetic field and thermal radiation on the magnetic levitation bearing, improving its operational reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the magnetic levitation motor according to an embodiment of the present invention;

[0018] Figure 2This is a three-dimensional structural diagram of the first plate in the magnetic shielding and cooling component according to an embodiment of the present invention;

[0019] Figure 3 This is a partial cross-sectional view of the magnetic shielding and cooling component according to an embodiment of the present invention;

[0020] Figure 4 for Figure 1 Right side view (some parts omitted);

[0021] Figure 5 This is a schematic diagram of the internal structure of a magnetically levitated centrifugal air compressor according to another embodiment of the present invention (the arrows in the figure indicate the flow direction of the cooling gas);

[0022] Figure 6 Vector diagram of the internal flow channel streamline of the first cooling channel of the magnetic shielding and cooling component in this embodiment of the invention, in which a turbulence column is provided;

[0023] Figure 7 The vector diagram of the internal flow path without turbulence columns in the first cooling channel of the magnetic shielding and cooling component in this embodiment of the invention.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Motor housing; 11. Second cooling channel; 12. Mounting ring; 21. Motor stator; 211. Back-wound winding; 22. Motor rotor; 221. Shaft; 3. Magnetic isolation and cooling component; 31. First cooling channel; 311. Inlet; 312. Outlet; 313. Turbine column; 32. First plate; 33. Second plate; 4. Sealing gasket; 10. Air compressor housing; 101. First stage impeller; 102. First stage collector; 1021. Inlet; 103. Outlet; 104. Inlet; 105. Inlet pipe; 106. Second stage collector; 107. First stage volute; 108. Second stage volute; 109. Second stage impeller; 201. Axial magnetic bearing; 202. Radial magnetic bearing. Detailed Implementation

[0026] See also Figures 1 to 7As shown, according to an embodiment of the present invention, a magnetic levitation motor is provided, including a motor housing 1, a motor stator 21 and a motor rotor 22 are provided inside the motor housing 1, the two ends of the motor rotor 22 are rotatably connected to the motor housing 1 through magnetic levitation bearings, the motor stator 21 includes a back-wound winding 211, and a magnetic isolation and cooling component 3 is provided between the end of the back-wound winding 211 and the adjacent magnetic levitation bearing, the aforementioned magnetic levitation bearing can specifically be an axial magnetic bearing 201 or a radial magnetic bearing 202. In this technical solution, while reducing the shaft length by using a back-wound winding 211, a magnetic isolation and cooling component 3 is installed between the magnetic levitation bearing and the back-wound winding 211. This allows the electromagnetic eddy currents generated by the back-wound winding 211 and the magnetic bearing during operation to generate heat within the magnetic isolation and cooling component 3. Simultaneously, the cooling effect of the magnetic isolation and cooling component 3 carries away and dissipates the heat generated within it, effectively preventing the magnetic isolation and cooling component 3 from transferring heat to adjacent components after heating up. As a result, the distance between the magnetic levitation bearing and the motor stator 21 can be set smaller, the shaft length is further reduced, and the rotor fixed frequency is increased, which is beneficial to improving the upper limit of the rotor speed. At the same time, it effectively eliminates the adverse effects of the stator magnetic field and thermal radiation on the magnetic levitation bearing, improving the operational reliability of the magnetic levitation bearing.

[0027] Understandably, the magnetic shielding and cooling component 3 is made of a material with magnetic shielding properties, such as an iron-nickel alloy.

[0028] In one specific embodiment, the magnetic shielding and cooling component 3 is fitted with a gap (that is, the magnetic shielding and cooling component 3 is fitted outside the rotating shaft 221 and the two do not contact each other, forming an annular gap) on the rotating shaft 221 of the motor rotor 22 and connected to the motor housing 1. The magnetic shielding and cooling component 3 has a first cooling channel 31 constructed inside, and a cooling medium is introduced into the first cooling channel 31 to efficiently dissipate heat from the magnetic shielding and cooling component 3 and effectively prevent the thermal radiation of the magnetic shielding and cooling component 3. The first cooling channel 31 can, for example, form a cooling cycle independently with an external cooling source (e.g., a cold water source). In a preferred embodiment, a second cooling channel 11 is constructed inside the motor housing 1. The first cooling channel 31 has an inlet 311 and an outlet 312. The cooling medium in the second cooling channel 11 can enter the first cooling channel 31 through the inlet 311 and flow back to the first cooling channel 11 through the outlet 312. Specifically, the second cooling channel 11 has cooling medium inlets and outlets that are respectively connected to the inlet 311 and the outlet 312, thereby enabling the cooling medium to efficiently cool both the motor housing 1 and the magnetically shielded cooling component 3. The channel design is simpler and more reasonable. At this time, the second cooling channel 11 forms a circulating connection with the external cooling source, participating in... Figure 1As shown, when the magnetic levitation motor has a horizontal structure, the inlet end of the second cooling channel 11 is at the top and the outlet end is at the bottom, so that heat exchange can be achieved by utilizing the weight of the cooling medium to flow from bottom to top. The second cooling channel 11 can be constructed as a spiral channel.

[0029] See Figure 2 As shown, multiple turbulence columns 313 are spaced apart within the first cooling channel 31, allowing the cooling medium entering through the inlet 311 to flow through the gaps between the turbulence columns 313 to the outlet 312. The turbulence columns 313 divide the flow channel between the inlet 311 and the outlet 312 into multiple interconnected sub-channels. These sub-channels allow the cooling medium preventing entry through the inlet 311 to flow directly out through the outlet 312, thus improving the cooling effect of the magnetically shielded cooling component 3. Figure 6 and Figure 7 It is clearly understood that within the first cooling channel 31 equipped with the turbulence column 313 of the present invention, the cooling water (cooling medium) continuously splits and merges after entering, increasing the turbulence of the coolant, enhancing its convective heat transfer capacity, promoting the disturbance between the coolant and the wall surface, and ensuring that the coolant flows evenly within the cooling structure. This allows the magnetically shielded radiator to achieve a 360-degree circumferential heat insulation effect while meeting sealing requirements with a smaller inlet and outlet. The shape of the aforementioned turbulence column 313 can be varied, for example... Figure 2 The shape shown is a rectangle, or a triangle, a circle, or other shapes not shown. To ensure the sealing of the first cooling channel 31 and the second cooling channel 11 at the docking position, a sealing element 4 (specifically a rubber sealing ring) is provided at the docking positions of the inlet 311 and the outlet 312 with the second cooling channel 11.

[0030] See Figure 3 As shown, in a specific embodiment, the magnetic shielding and cooling component 3 includes a first plate 32 and a second plate 33. A turbulence column 313 is disposed on the first side of the first plate 32, and the second plate 33 is fastened to the first side to form a first cooling channel 31 between the first plate 32 and the second plate 33. The first plate 32 and the second plate 33 can be detachably connected. Under some working conditions, a fixed connection method such as welding can also be used. The magnetic shielding and cooling component 3 is formed by assembly, which simplifies the formation process of the component.

[0031] In some embodiments, the inner peripheral wall of the motor housing 1 has a mounting protrusion 12 extending radially inward. The magnetic levitation bearing is assembled on the first side of the mounting protrusion 12, and the magnetic isolation and cooling component 3 is assembled on the second side of the mounting protrusion 12. It is understood that the first and second sides are opposite sides of the mounting protrusion 12. With this structure, after assembling the magnetic isolation and cooling component 3 (which has mounting through holes on its outer periphery and can be bolted on with screws), it, together with the mounting protrusion 12, spatially isolates the motor stator 21 and motor rotor 22 from the magnetic levitation bearing on the other side. It is understood that a certain degree of communication is still maintained between the two through the annular gap between the magnetic isolation and cooling component 3 and the rotating shaft 221. It should be noted that the second cooling channel 11 has a branch channel extending toward the mounting protrusion 12, and the first cooling channel 31 and the branch channel form a mating communication.

[0032] See Figure 5 As shown in the embodiment of the present invention, a magnetic levitation centrifugal air compressor is also provided, including an air compressor housing 10. A motor stator 21 and a motor rotor 22 are provided inside the air compressor housing 10. The two ends of the motor rotor 22 are rotatably connected to the air compressor housing 10 through magnetic levitation bearings. The motor stator 21 includes a back-wound winding 211. A magnetic isolation and cooling component 3 is provided between the end of the back-wound winding 211 and the adjacent magnetic levitation bearing. The arrangement of the magnetic isolation and cooling component 3 is completely consistent with that of the magnetic levitation motor. The only difference is that the motor housing 1 is changed to the air compressor housing 10. Therefore, the specific structure and design features of the magnetic isolation and cooling component 3 will not be described in detail here.

[0033] Unlike a magnetic levitation motor, the air compressor housing 10 has a first-stage collector 102 connected to the first-stage impeller 101 at its first end. The first-stage impeller 101 is connected to the first end of the rotating shaft 221. The air compressor housing 10 has a second-stage collector 106 connected to the second-stage impeller 109 at its second end. The second-stage impeller 109 is connected to the second end of the rotating shaft 221. A first-stage volute 107 is also connected between the first-stage collector 102 and the air compressor housing 10. A second-stage volute 108 is also connected between the second-stage collector 106 and the air compressor housing 10. The air compressor housing 10 has an air outlet 103 and a... The air inlet 104 is connected to the external environment. The first-stage collector 102 has a guide port 1021 connected to its inlet. The guide port 1021 is connected to the outlet 103 through the guide pipe 105. Thus, when the air compressor is running, the shaft 221 will drive the first-stage impeller 101 to rotate at high speed, thereby creating a negative pressure at the inlet position of the first-stage collector 106. Under the action of the aforementioned negative pressure, the external airflow at the air inlet 104 will be guided into the air compressor housing 10 and enter the first-stage volute 107 through the guide pipe 105 and the guide port 1021, thereby achieving effective cooling of the motor stator 11 and motor rotor 12 by utilizing self-driven airflow. The aforementioned guide ports 1021 can be arranged in multiple intervals along the circumference of the first-stage collector 102. Similarly, the aforementioned guide pipes 105, outlet 103, and inlet 104 are also arranged in multiple corresponding intervals, thereby achieving multi-angle airflow cooling along the circumference and ensuring effective cooling of internal components.

[0034] In a preferred embodiment, magnetic isolation and cooling components 3 are provided at both ends of the motor stator 21, namely a first magnetic isolation and cooling component and a second magnetic isolation and cooling component, wherein the first magnetic isolation and cooling component is located at the end of the motor stator 21 closer to the first-stage impeller 101. Figure 5 The second magnetically shielding and cooling component is located at the left-hand position of the motor stator 21, away from the first-stage impeller 101. Figure 5 (At the right-hand position), the air outlet 103 is located on the air compressor housing 10 at a position corresponding to the area between the first magnetic isolation and cooling component and the motor stator 21. The air inlet 104 is located on the air compressor housing 10 at a position corresponding to the area on the side of the air compressor housing 10 away from the motor stator 21, as detailed in [see details]. Figure 5 As shown, the cooling airflow entering through the air inlet 104 enters the air gap between the motor stator 21 and the motor rotor 22 through the annular gap formed between the second magnetic cooling component and the rotating shaft 221. On the one hand, it can produce a throttling and acceleration effect, improving cooling efficiency, and on the other hand, it can provide more targeted cooling for the motor rotor 22. Understandably, most of the heat of the motor stator 21 is borne by the second cooling channel 11.

[0035] In another preferred embodiment, a cooling air passage corresponding to the air inlet 104 is constructed on the radial magnetic bearing 202 at the second end, which can simultaneously cool and dissipate heat from the radial magnetic bearing 202.

[0036] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A magnetic levitation motor, comprising a motor housing (1), wherein a motor stator (21) and a motor rotor (22) are disposed within the motor housing (1), and both ends of the motor rotor (22) are rotatably connected to the motor housing (1) via magnetic levitation bearings, characterized in that, The motor stator (21) includes a back-wound winding (211). A magnetic isolation and cooling component (3) is provided between the end of the back-wound winding (211) and the adjacent magnetic levitation bearing. The magnetic isolation and cooling component (3) is fitted onto the shaft (221) of the motor rotor (22) and connected to the motor housing (1). A first cooling channel (31) is constructed inside the magnetic isolation and cooling component (3). The inner peripheral wall of the motor housing (1) has a mounting protrusion (12) extending radially inward. The magnetic levitation bearing is assembled on the first side of the mounting protrusion (12), and the magnetic isolation and cooling component (3) is assembled on the second side of the mounting protrusion (12) to form a spatial relative isolation between the motor stator (21) and the motor rotor (22) and the magnetic levitation bearing on the other side.

2. The magnetic levitation motor according to claim 1, characterized in that, The motor housing (1) has a second cooling channel (11) inside. The first cooling channel (31) has an inlet (311) and an outlet (312). The cooling medium in the second cooling channel (11) can enter the first cooling channel (31) through the inlet (311) and flow back to the second cooling channel (11) through the outlet (312).

3. The magnetic levitation motor according to claim 2, characterized in that, The first cooling channel (31) is provided with a plurality of turbulence columns (313) at intervals, so that the cooling medium entering through the inlet (311) flows to the outlet (312) through the intervals between the plurality of turbulence columns (313).

4. The magnetic levitation motor according to claim 3, characterized in that, The magnetic shielding and cooling component (3) includes a first plate (32) and a second plate (33). The turbulence column (313) is disposed on the first side of the first plate (32), and the second plate (33) is fastened to the first side to form the first cooling channel (31) between the first plate (32) and the second plate (33).

5. The magnetic levitation motor according to claim 1, characterized in that, The magnetic shielding and cooling component (3) is made of iron-nickel alloy material.

6. A magnetically levitated centrifugal air compressor, comprising an air compressor housing (10), wherein a motor stator (21) and a motor rotor (22) are disposed within the air compressor housing (10), and both ends of the motor rotor (22) are rotatably connected to the air compressor housing (10) via magnetically levitated bearings, characterized in that, The motor stator (21) includes a back-wound winding (211). A magnetic isolation and cooling component (3) is provided between the end of the back-wound winding (211) and the adjacent magnetic levitation bearing. The magnetic isolation and cooling component (3) is fitted onto the shaft (221) of the motor rotor (22) and connected to the air compressor housing (10). A first cooling channel (31) is constructed inside the magnetic isolation and cooling component (3). The inner peripheral wall of the air compressor housing (10) has a mounting protrusion (12) extending radially inward. The magnetic levitation bearing is assembled on the first side of the mounting protrusion (12), and the magnetic isolation and cooling component (3) is assembled on the second side of the mounting protrusion (12) to form a spatial relative isolation between the motor stator (21) and the motor rotor (22) and the magnetic levitation bearing on the other side.

7. The magnetic levitation centrifugal air compressor according to claim 6, characterized in that, The magnetic shielding and cooling component (3) is fitted onto the rotating shaft (221) of the motor rotor (22) and connected to the air compressor housing (10). The magnetic shielding and cooling component (3) has a first cooling channel (31) inside.

8. The magnetic levitation centrifugal air compressor according to claim 7, characterized in that, The air compressor housing (10) has a second cooling channel (11) inside. The first cooling channel (31) has an inlet (311) and an outlet (312). The cooling medium in the second cooling channel (11) can enter the first cooling channel (31) through the inlet (311) and flow back to the second cooling channel (11) through the outlet (312).

9. The magnetic levitation centrifugal air compressor according to claim 6, characterized in that, The first end of the air compressor housing (10) is connected to a first-stage collector (102) corresponding to the first-stage impeller (101). The air compressor housing (10) has an air outlet (103) and an air inlet (104) communicating with the external environment. The first-stage collector (102) has a flow guide (1021) communicating with its inlet. The flow guide (1021) is connected to the air outlet (103) through a flow guide pipe (105).

10. The magnetic levitation centrifugal air compressor according to claim 9, characterized in that, The air compressor housing (10) has an inner peripheral wall with a mounting protrusion (12) extending radially inward therein, the magnetic levitation bearing is assembled on the first side of the mounting protrusion (12), and the magnetic isolation cooling component (3) is assembled on the second side of the mounting protrusion (12); and / or, the magnetic isolation cooling component (3) is made of iron-nickel alloy material.

11. The magnetic levitation centrifugal air compressor according to claim 9 or 10, characterized in that, The motor stator (21) is provided with magnetic isolation and cooling components (3) at both ends, namely a first magnetic isolation and cooling component and a second magnetic isolation and cooling component. The first magnetic isolation and cooling component is located at the end of the motor stator (21) close to the first stage impeller (101), and the second magnetic isolation and cooling component is located at the end of the motor stator (21) away from the first stage impeller (101). The air outlet (103) is constructed on the air compressor housing (10) at a position corresponding to the area between the first magnetic isolation and cooling component and the motor stator (21). The air inlet (104) is constructed on the air compressor housing (10) at a position corresponding to the area of ​​the second magnetic isolation and cooling component away from the motor stator (21).

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