Motor cooling structure with external cooling assembly and cooling method

Abstract

The invention relates to a motor cooling structure with an external cooling assembly and a cooling method, the motor cooling structure comprises an air compressor, an air outlet of the air compressoris connected with a temperature and pressure reduction assembly through a cooling pipe group, and an output end of the temperature and pressure reduction assembly is led back into the air compressor;the temperature and pressure reduction assembly comprises a heat exchanger, the air inlet end of the heat exchanger is communicated with the high-temperature and high-pressure air output position of the air compressor, the output end of the heat exchanger is communicated with an expansion impeller, and the output end of the expansion impeller is led back into the air compressor; the heat exchangeris further provided with an air blowing assembly used for providing normal-temperature and normal-pressure air for the heat exchanger, and the air blowing assembly comprises an air blower driven by the expansion impeller and an air blowing pipeline connected with the air blower and the heat exchanger. The temperature of the cooling air entering the motor can be far lower than the ambient temperature after being processed by the temperature reduction and pressure reduction assembly, and the cooling effect on the whole motor, especially a motor rotating shaft, is far better than that of commonair cooling and water cooling.

Description

technical field [0001] The invention relates to the technical field of motor cooling, in particular to a motor cooling structure and cooling method with an external cooling component. Background technique [0002] High-speed air compressors have high efficiency, small size, and low maintenance costs, and have a wide range of applications, such as fuel cell vehicles, paper industry, sewage treatment, etc. But at present, the power of high-speed air compressors is generally not very large. The main reason is that with the increase of speed and power, the motor has the problem of high heat generation and difficult heat dissipation, especially the motor rotor, which has high heat density and small heat dissipation area. If the heat dissipation is insufficient and the temperature is too high, there will be a risk of demagnetization, which will seriously affect the reliability and life of the motor. [0003] At present, the cooling methods for motors mainly include air cooling, a...

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Problems solved by technology

[0004] Air-cooling, air-air cooling and air-water cooling all drive air to flow in the motor to cool the motor. The direct cooling medium is air at room temperature. Due to the low density and specific heat capacity of air, the cooling capacity is limited, and it is difficult to increase the power density of the motor. And the heat load is raised to a higher level;

[0005] Liquid cooling has strong cooling capacity, but the coolant can only pass to the motor stator, and it is difficult to pass liquid to the motor rotor, and the equipment is complicated and costly. At present, only large motors (above megawatts) can pass liquid to the motor rotor , when liquid cooling is applied to small and medium-sized motors, the motor rotor still relies on air cooling. Due to the limitation of the heat dissipation capacity of the motor rotor, liquid cooling is also limited in further improving the thermal load and power density of the motor;

[0006] Evaporative cooling is similar to liquid cooling. Evaporative cooling has a strong cooling capacity, but it is still difficult to improve the cooling capacity of the motor rotor. Moreover, evaporative cooling has high requirements for the airtightness of the motor, and there are many ancillary equipment and high cost. It has no obvious competition in large-scale applications. Advantage

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