Abstract
In this article, the analysis of electromagnetic performances and loss according to the operating ranges are conducted through the comparative study with surfaced mounted permanent magnet synchronous machine(SPMSM) and vernier PM machine(VPMM), which is classified into flux modulation pole and no flux modulation pole types. We investigated SPMSM and VPMM show different flux weakening capability at high speed, VPMM can maintain high torque due to the flux modulation effect but SPMSM was not. We revealed that high torque and power factor are related with the gear ratio closely for VPMM and SPMSM. Furthermore, VPMM with high gear ratio model is subjected to the influence of eddy current which causes degradation of the output torque and the loss of rotor core tends to be increased depending on levels of flux modulation.
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