Research on Magnetic Field Prediction of Synchronous Reluctance Motor Considering Structure of Multilayer Flux Barrier and Saturation of Rotor Core

Abstract

The structure and high saturation of the rotor make the magnetic field composition of synchronous reluctance motor (SynRM) more complicated. This article presents an improved analytical calculation approach for determining the nonlinear magnetic fields of the SynRM. The characteristics of this method are mainly reflected in two aspects. First, a topology partition method is proposed to approximate the intricate rotor flux barrier topology by integrating the traditional subdomain model, thereby overcoming the limitations of directly approximating the fan-shaped structure. Second, the equivalent current region is included on both sides of the divided flux barrier subdomain to simulate the magnetic potential drop (MPD) caused by rotor core saturation. The advantage of this approach lies in its alteration of only the input matrix without impacting the total coefficient matrix, leading to heightened computational efficiency. Subsequently, the proposed method is compared with the finite element method (FEM) and experimental results, and the modeling efficiency and the extensibility of the approach are discussed. Furthermore, the calculation and application of the proposed method in the motor’s dynamic process are discussed in conjunction with the motor state equation and inverter modulation method.