Reluctance torque analysis and reactance calculation of IPM for HEVs based on FEM

Rational utilization of reluctance torque can effectively improve torque performance and speed range in constant power region of interior permanent magnet(IPM) electric machines, thereby affecting dynamic performance of HEVs. This paper presents a reluctance torque analysis method on the basis of calculating the torque-power angle characteristic curve in advantage of FEM. Moreover, the direct(d) and quadrature(q) axis synchronous reactance is calculated. Furthermore, a measure of improving flux weakening performance by increasing salient-pole rate is proposed. The prototype experiment results verify this analysis method. The method presented in this paper provides reference for electromagnetic design of traction motors in HEVs.