Study on optimization design of the main electromagnetic parameters of permanent magnet synchronous motor

The electromagnetic parameters of permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance X_d and q axis reactance X_q are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length and isolation magnetic bridge dimensions in the rotor is given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is fitted to optimize motor structure.