Analysis and Optimization of a Sinusoidally Magnetized Flux Reversal PM Machine with Auxiliary Teeth

摘要

As a member of the stator permanent magnet (PM) brushless machine, the flux reversal PM (FRPM) machine has a simple structure, good fault tolerance, and high efficiency, which have caused extensive concern. However, torque ripple and magnetic flux leakage of FRPM machine limit the application prospect. Consequently, a sinusoidally magnetized (SM) FRPM machine with auxiliary teeth is proposed in this paper. SM-PM array is installed in the stator slot opening and the optimal magnetization angle of PM is investigated. Moreover, the stator added auxiliary teeth to reduce the magnetic flux leakage and stabilize the PM. To obtain better electromagnetic performance, the two machines are globally optimized by using the response surface method. Finally, the electromagnetic performance of the SM-FRPM machine is compared with the conventional FRPM machine by finite element analysis. The results show that compared with the conventional FRPM machine, the SM-FRPM machine can effectively solve the problems of serious magnetic flux leakage and low torque density. The SM-FRPM machine has higher no-load air gap flux density, no-load flux linkage, no-load back-EMF, and average torque, while the cogging torque and torque ripple are lower.

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