Thermal Circuit Analysis of Permanent Magnet Motor

As fossil fuels dried up, electric vehicles became a major research hotspot. As the most important part of electric vehicles, permanent magnet synchronous motors have a greater impact on their stability and reliability because of their closed structure, poor heat dissipation, and large temperature rise during operation. To improve the solution accuracy of temperature prediction and motor performance, the modelling and solving methods of temperature fields have been continuously developed, mainly including the finite element method and Lumped Parameter Method. This paper analyzes the heat dissipation simulation of the 150kW permanent magnet synchronous motor, uses MATLAB software to build the motor thermal circuit model, and realizes the heat dissipation simulation of the 150kW permanent magnet synchronous motor. The results show that the model built in this paper can effectively simulate the heat dissipation of each component during the operation of the motor, which is consistent with the actual situation. Further, considering the temperature limitation during the operation of the motor, this paper adopts the water-cooled method to cool the motor, which effectively reduces the temperature of each motor component and achieves the motor's safe operation.