Influence of Ventilation Modes on the 3D Global Heat Transfer of PMSM Based on Polyhedral Mesh

Aiming at the problem of high winding temperature caused by the large armature winding current of permanent magnet synchronous motor (PMSM) for compressors, a 500kW PMSM for a compressor was studied. The three dimensional global fluid-heat coupled heat transfer model is established and is discretized by the polyhedral mesh. The fluid and thermal coupling field of a permanent magnet motor are numerically calculated when the rotor rotation is considered. The temperature distribution characteristics of the end windings at different positions are analyzed. Further, the structure of the motor cooling system is improved. The effects of different ventilation modes on the temperature distribution of the motor are compared and analyzed. The temperature distribution of the stator windings under different armature currents is calculated. The calculation results of the end winding temperature are compared with the measured data, verifying the correctness of the calculation method. Conclusions have been obtained that are helpful to the design and operation of the compressor water-cooled permanent magnet synchronous motor.