High-speed operation of the brushless motor controller, produced a large number of loss would result in higher temperature, thermal properties of materials will therefore change, thus affect the loss of the motor controller and so on, until the two interaction balance, temperature stability. In this paper, by using coupling method, electromagnetic field and the temperature of high speed brushless motor controller coupling calculation, information feedback, improve the calculation accuracy. By temperature distribution, heat load density winding end temperature, the heat load density development winding end when the temperature is 68. 8 ℃, thermal coupling stator cut to read temperature for 72. 4℃。 By using thermistor temperature rise test was carried out on the prototype, the winding temperature for 75. 6 ℃, the analysis of the operation of electromagnetic field and temperature field coupling calculation results error than the thermal load density method improves the 4. 8%. Coupling calculation results using the electromagnetic field and the temperature and heat load density method is used to calculate the results of comparison, and permanent magnet rotor temperature raised the stator temperature rise decreased. High-speed brushless motor controller run into heat loss, is a part of the temperature, affect the material properties. Copper winding with the rise of temperature resistance and produce copper consumption increase. High-speed brushless motor controller ndfeb is recommended for the material, the material temperature coefficient is high, the residual magnetic induction intensity of ndfeb permanent magnet material is negatively related to the temperature, the temperature rise caused by permanent magnet remanence intensity change will cause the change of the center of iron loss, loss decreases as temperature increases slightly down. Permanent magnet electric to green is negatively related to the temperature rise, so the temperature rise, permanent magnet hydrocyclone is also will increase. On appeal, it can be seen in the high speed brushless permanent magnet motor controller part of the material properties and temperature influence each other, so through the coupling of electromagnetic and temperature field, considering the interaction of various factors in the process of calculation, can better simulate the actual situation brushless motor controller.
