At present, motors are the main source of power for new energy vehicles (NEV). The heat of the motor during operation is mainly generated by the stator windings. In Traditional motors, the heat generated by the stator windings needs to pass through the stator core to be transferred to the motor casing, and the coolant in the water jacket removes the heat. In this heat dissipation mode, the transfer of heat from the heat-generating portion to the heat-radiating portion is not fast. If we want better heat dissipation, the circulation speed of the cooling liquid must be increased, thereby consuming a large amount of auxiliary power of the heat dissipation system. In this paper, modified the conventional water-cooled permanent magnet synchronous motor (PMSM). The heat from the stator winding can be directly transmitted to the motor housing through the heat pipe, and then taken away by the coolant in the water jacket. In order to study the heat dissipation effect of the improved system, this paper constructs a heat transfer model from the heat-producing portion to the heat-radiating portion. According to the working principle and the internal structure of the moto, the heat transfer characteristics of the heat pipe, the model is used to analysis the differences of heat dissipation between the traditional water-cooled motor (TM) and the motor modified with heat pipe (HP). The research shows that using heat pipes to improve the motor cooling system can significantly improve the heat dissipation efficiency of the motor. The water-cooled PMSM with rated power of 21kW is improved by heat pipe. Under the rated working condition, the temperature of the end winding of the motor can be reduced by 8.49K. It can effectively reduce the auxiliary energy consumption required for heat dissipation of the motor. This study can provide a new design method for the heat dissipation of automotive motors.
Study on the Heat Dissipation Effect of Automobile Motor Based on Heat Pipe
2019
Aufsatz (Konferenz)
Englisch
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