Analysis and optimization of temperature field of high-speed permanent magnet motor

High-speed permanent magnet motor (HSPMM) has a wide application prospect in machinery, energy, and other industries. The temperature field of HSPMM was analyzed and optimized in order to reduce the operating temperature and improve the service life and efficiency. Two new methods were proposed to reduce the copper loss and iron loss. Response surface method was employed to improve permanent magnet parameters. The response surface results demonstrate that then factor A is 7.7 mm, factor B is 5.0 mm, and factor C is 134.9°, the core loss is minimum with 32.91 W. On the premise of comprehensively considering the thermal convection, conduction, and radiation effects, the equivalent thermal circuit model of HSPMM was creatively established. The theoretical analysis data show that the temperature of each position of the optimized motor is reduced by 8.2°C–10.2°C. In order to verify the correctness of the above theoretical analysis, a temperature measuring experiment was conducted. The temperature error between the measured data and the theoretical calculation data is acceptable, and the average error is only 4.01%. The research methods and conclusions can be widely extended to the temperature field optimization of other permanent magnet motors.