关键词: 永磁电机, 多物理场, 磁热耦合, 永磁体工作点, 温度场

Abstract: The performance of permanent magnet in permanent magnet motor was greatly affected by temperature and external magnetic field, the change of working point of small volume and high power density permanent magnet motor seriously affected the working current and temperature rise of motor. According to the temperature image of each material property in the motor, in order to improve the accuracy of the calculation of the permanent magnet working point, proposes a real-time calculation method of the multi physical permanent magnet working point based on the magnetic thermal coupling. Taking a 3 kW permanent magnet motor as an example, the simulation calculation was carried out, and the performance test of the prototype was carried out. The error between the calculation results and the test results was less than 3% through online current detection and temperature rise measurement, which verified that the calculation method proposed effectively improved the accuracy of the calculation of the working point and temperature field of the permanent magnet motor.

Key words: permanent magnet motor, multi physical field, magnetic thermal coupling, permanent magnet working point, temperature field