Efficient cooling high-speed permanent magnet synchronous motor

Abstract

The invention relates to the technical field of fluid pressure executing mechanisms, and provides an efficient cooling high-speed permanent magnet synchronous motor which comprises a machine shell, a stator and a rotor, the casing is of a tubular structure, a left end cover and a right end cover are hermetically fixed at two ends of the casing, the stator penetrates through the centers of the left end cover and the right end cover to be rotatably fixed, an air outlet is formed in the middle of the side surface of the casing, an air inlet is formed in the side surface of the casing close to the end part, rotor fan blades are fixed at two end parts of the rotor, and the air inlet is opposite to the rotor fan blades. The structure is extremely simplified, extremely high heat dissipation efficiency is achieved, the working power of the motor is not affected, the working temperature can be effectively reduced, the effective power capacity of the motor can be greatly improved, the manufacturing cost of the motor is saved, and the motor can be effectively integrated in a whole air duct of the air suspension centrifugal blower and is particularly suitable for the air suspension centrifugal blower.

Description

Technical Field

[0001] The invention relates to a high-efficiency cooling high-speed permanent magnet synchronous motor, belonging to the technical field of fluid pressure actuators. Background Art

[0002] An air suspension centrifugal blower is an air compression mechanism. As the blower rotor rotates at high speed, air creates a dynamic pressure effect between the rotor and the foil bearing surface, forming a high-pressure air film that lifts the rotor. Its core is a high-speed motor that rotates at speeds exceeding 10,000 revolutions per minute. Due to its high speed and relatively small size, high-speed motors can be directly connected to high-speed loads, eliminating the need for traditional mechanical speed-increasing devices, thereby reducing system noise and improving transmission efficiency. The advantages of high-speed motors include high power density, high transmission efficiency, low noise, and fast dynamic response. The high-speed motors in air suspension centrifugal blowers are primarily implemented using permanent magnet synchronous motors.

[0003] A permanent magnet synchronous motor (PMSM) is a synchronous motor that uses permanent magnets to generate a magnetic field. The rotor's rotational speed is synchronized with the frequency of the current flowing through the stator windings. Its operating principle is based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnets on the rotor. The rotor is equipped with pre-magnetized permanent magnets, which generate a strong magnetic field when rotating, thereby providing greater output torque. The motor's control system precisely regulates the current to ensure that the rotor rotates synchronously with the rotating magnetic field, maintaining stable operation.

[0004] Due to the high speed of high-speed permanent magnet synchronous motors, any liquid in them will seriously hinder the increase in rotation speed, so oil cooling or water cooling structure cannot be used. However, due to the high-speed rotation of high-speed permanent magnet synchronous motors, the windings accumulate a lot of heat, the internal heat dissipation is poor, and even effective heat dissipation cannot be formed, which significantly reduces the effective power capacity of the motor.

[0005] A typical example of the prior art is a high-speed permanent magnet synchronous motor with a stator winding interlayer water channel cooling system disclosed in Chinese invention patent application number CN201910662047.7. The motor is effectively cooled by setting interlayer water channels and spiral water channels. However, this method will undoubtedly hinder the rotor speed, significantly reducing the upper limit of the rotor speed. Therefore, this structure is basically unusable for high-speed motors with higher speed requirements. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a high-speed permanent magnet synchronous motor with high efficiency cooling. The high-speed permanent magnet synchronous motor with high efficiency cooling is based on a unique air duct design. It can achieve extremely high heat dissipation efficiency based on an extremely simplified structure without affecting the working power of the motor, thereby effectively reducing the operating temperature and greatly helping to improve the effective power capacity of the motor.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a high-efficiency cooling high-speed permanent magnet synchronous motor, comprising a casing and a rotor assembly and a stator winding installed in the casing. The casing is a tubular structure, with a left end cover and a right end cover sealed and fixed at both ends of the casing. The rotor assembly passes through the center of the left end cover and the right end cover and is rotatably fixed. An air outlet is opened in the middle of the side of the casing, and an air inlet is opened near the end of the side of the casing. Stator coils are fixed at both ends of the stator winding, and the air inlet is directly opposite the stator coil; a gap is formed between the rotor assembly and the stator winding, forming an air duct from the air inlet through the gap to the air outlet.

[0009] The stator winding is a two-section structure, with a circumferentially distributed sheet structure located between the two sections. The air outlet is located directly between the two sections.

[0010] There are multiple air inlets distributed circumferentially near both ends of the casing.

[0011] The air inlets are evenly distributed along the circumference.

[0012] One or two air outlets are provided on the casing.

[0013] The front and rear sections of the stator winding are of equal length, and the air outlet is located in the axial center of the casing.

[0014] There is a gap between the stator winding and the casing.

[0015] The axial distance between the air inlet and the air outlet is smaller than the axial distance between the air inlet and the end face of the casing.

[0016] The number of stator coils is consistent with the number of windings of the stator winding.

[0017] The beneficial effects of the present invention are: extremely simplified structure, extremely high heat dissipation efficiency is achieved without affecting the working power of the motor, the working temperature can be effectively reduced, which is greatly beneficial to improving the effective power capacity of the motor and saving the manufacturing cost of the motor. It can be effectively integrated into the whole air duct of the air suspension centrifugal blower, and is particularly suitable for air suspension centrifugal blowers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of at least one embodiment of the present invention.

[0019] In the figure: 11- housing, 12- left end cover, 13- right end cover, 14- air inlet, 15- air outlet, 21- rotor assembly, 22- stator winding, 23- stator coil. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0021] The first embodiment of the present invention relates to Figure 1 The illustrated embodiment shows a high-efficiency cooling high-speed permanent magnet synchronous motor, comprising a casing 11 and a rotor assembly 21 and a stator winding 22 installed in the casing 11. The casing 11 is a tubular structure, with a left end cover 12 and a right end cover 13 sealed and fixed at both ends of the casing 11. The rotor assembly 21 is rotatably fixed through the center of the left end cover 12 and the right end cover 13. An air outlet 15 is provided in the middle of the side of the casing 11, and an air inlet 14 is provided on the side of the casing 11 near the end. Stator coils 23 are fixed at both ends of the stator winding 22, and the air inlet 14 faces the stator coil 23. There is a gap between the rotor assembly 21 and the stator winding 22, forming an air duct from the air inlet 14 through the gap to the air outlet 15.

[0022] Thus, the cooling air can be driven by the negative pressure of the air outlet 15 and enter from the air inlet 14, or be poured in from the air inlet 14, and interact with the rotor assembly 21 and the stator winding 22 for heat, and then blown out from the air outlet 15. The airflow direction of the cooling air entering from the air inlet 14 and being blown out from the air outlet 15 is as follows: Figure 1 The middle arrow points to the direction shown, thereby forming an air duct with excellent heat dissipation effect.

[0023] Compared to other applications, this application is particularly effective when used in air suspension centrifugal blowers. Air suspension centrifugal blowers constantly require a large amount of intake and exhaust, and the heat dissipation of this application also requires a large amount of intake and exhaust. Therefore, the intake and exhaust ducts of this application can be effectively integrated into the overall air duct of the air suspension centrifugal blower, resulting in a high degree of product integration and excellent heat dissipation.

[0024] The second embodiment of the present invention is substantially similar to the first embodiment, primarily in that the stator winding 22 comprises a front and rear section structure. A circumferentially distributed sheet-like structure is located between the two sections of the stator winding 22, with the air outlet 15 positioned directly between the two sections. The sheet-like structure significantly guides cooling air, facilitating airflow and reducing air stagnation between the two sections of the stator winding 22. Furthermore, the two-section structure significantly improves heat dissipation efficiency. Compared to a single-sided, front-to-back channel, the two-section structure achieves a bilateral channel with air intake at both ends and outlet in the middle, achieving over three times the heat dissipation efficiency of a single-sided channel.

[0025] Furthermore, one or two air outlets 15 are provided on the housing 11 .

[0026] Furthermore, the front and rear sections of the stator winding 22 are of equal length, and the air outlet 15 is located in the axial center of the housing 11 .

[0027] The third embodiment of the present invention is substantially the same as the first embodiment, mainly in that a plurality of air inlets 14 are circumferentially distributed near both ends of the casing 11 .

[0028] Furthermore, the air inlets 14 are evenly distributed along the circumference.

[0029] Furthermore, the axial distance between the air inlet 14 and the air outlet 15 is smaller than the axial distance between the air inlet 14 and the end surface of the housing 11 .

[0030] This greatly improves the air intake efficiency, thereby effectively improving the overall heat dissipation efficiency and avoiding local high heat.

[0031] The fourth embodiment of the present invention is substantially the same as the first embodiment, mainly in that the number of stator coils 23 is consistent with the number of windings of the stator winding 22 .

[0032] Furthermore, there is a gap between the stator winding 22 and the housing 11 .

[0033] This greatly reduces rotational obstacles, effectively reduces wind resistance caused by obstructions, and reduces air turbulence in the cooling duct, thereby effectively increasing wind speed, minimizing heat dissipation power consumption, and ultimately increasing the effective power capacity of the motor.

Claims

1. A high-efficiency cooling high-speed permanent magnet synchronous motor, comprising a housing (11) and a rotor assembly (21) and a stator winding (22) mounted in the housing (11), characterized in that: The casing (11) is a tubular structure. A left end cover (12) and a right end cover (13) are sealed and fixed at both ends of the casing (11). The rotor assembly (21) passes through the center of the left end cover (12) and the right end cover (13) and is rotatably fixed. An air outlet (15) is opened in the middle of the side of the casing (11). An air inlet (14) is opened near the end of the side of the casing (11). Stator coils (23) are fixed at both ends of the stator winding (22). The air inlet (14) is opposite to the stator coil (23). A gap is formed between the rotor assembly (21) and the stator winding (22), forming an air duct from the air inlet (14) through the gap to the air outlet (15).

2. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The stator winding (22) is a front and rear two-section structure, and a circumferentially distributed sheet structure is provided between the front and rear sections of the stator winding (22). The air outlet (15) is located directly opposite the front and rear sections of the stator winding (22).

3. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: A plurality of air inlets (14) are circumferentially distributed near both ends of the housing (11).

4. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 3, characterized in that: The air inlets (14) are evenly distributed along the circumference.

5. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 2, characterized in that: One or two air outlets (15) are provided on the housing (11).

6. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 2, characterized in that: The front and rear sections of the stator winding (22) are of equal length, and the air outlet (15) is located in the axial center of the housing (11).

7. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: There is a gap between the stator winding (22) and the casing (11).

8. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The axial distance between the air inlet (14) and the air outlet (15) is smaller than the axial distance between the air inlet (14) and the end face of the casing (11).

9. The high-efficiency cooling high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The number of the stator coils (23) is consistent with the number of windings of the stator winding (22).

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