Fast Computation of Steady-State Performance in Line-Start Synchronous Reluctance Motor Based on Equivalent Circuit and Finite Element Analysis

Abstract

Line-Start Synchronous Reluctance Motor (LSSynRM) has been received the attention as high efficiency motor. However, LS-SynRM must be performed using electromagnetic and mechanical transient analysis of finite-element analysis (FEA). This analysis method has a disadvantage of requiring a lot of analysis time. Therefore, in this paper, the fast performance analysis method is proposed based on an equivalent circuit and FEA. The operating points of LS-SynRM are determined by the dq-axis inductances which have the nonlinear characteristics. Considering the nonlinear characteristic of dq-axis inductance, the parameter is computed using magnetostatic FEA. Based on the motor parameters and equivalent circuit, the current vector is computed, and the iteration is performed until the current vector converges. By comparing the performances using the proposed analysis method and electromagnetic and mechanical transient analysis of FEA according to the load conditions, the effectiveness of the proposed analysis method is verified. Furthermore, the manufactured 2.2kW LS-SynRM is testing, and the proposed analysis method is verified by comparing experiment results.