Research on Heat Dissipation Performance of Automobile Motor Based on Heat Pipe Optimization Design 2022-01-0729

In new energy vehicles, the electric motor, as the main power source, is developing toward high power density. However, its heat generation problem always affects the overall performance of the motor, so an efficient motor cooling system is especially important. In desert or water-scarce areas, liquid cooling cannot meet the needs of new energy vehicle motor cooling. When glycol or other liquid coolants are low or depleted, motor heat dissipation becomes less effective. Heat pipe is a heat dissipation technology with advantages such as fast thermal response and light weight. In this paper, by improving the heat pipe arrangement and reducing the overall mass of the heat dissipation system, a heat pipe optimization design based on a drive motor heat dissipation scheme is proposed, and the overall stability of the motor working under high temperature conditions is improved. In this paper, the heat pipe arrangement scheme is set up with the heat pipe heat transfer characteristics, and the motor temperature rise model, vehicle dynamics model and heat pipe heat transfer model are established. Heat pipes are installed at each end of the motor and directly connected at the end winding and the housing to effectively shorten the heat transfer path of the motor end winding. Based on the heat pipe optimization, the heat dissipation performance of the motor at high temperature is analyzed and the heat dissipation efficiency under different drives is calculated. The results show that the method of heat dissipation in the optimized design of the heat pipe motor improves the heat dissipation efficiency of the motor, and the temperature of the motor winding is reduced by 6~10°C. This heat dissipation method can effectively improve the stability of the motor and provide a new idea for the heat dissipation method of the motor.