Research on Demagnetization Asymmetry Caused by Armature Reaction of Double V-shaped Combined Pole IPMSM

The problem of irreversible demagnetization in permanent magnet synchronous motor (PMSM) is a key factor affecting the design cost and reliable operation of the motor. To solve the irreversible demagnetization of PMs in the double V-shaped combined pole interior permanent magnet synchronous motors (DVCP-IPMSM), this paper studies the demagnetization asymmetry caused by armature reaction in the DVCP-IPMSM. The results show that the risk of demagnetization of the PM on the windward side of the large V in the double V -shaped combined pole (DVCP) is the largest. Therefore, a scheme of differentially combined magnetic pole to suppress the demagnetization asymmetry is proposed. The comparative verification shows that the scheme reduces the demagnetization asymmetry of the PMs in the DVCP by 4.11 times, which effectively suppresses the demagnetization asymmetry of the PMs in the DVCP.