Three-Dimensional Magnetic Equivalent Circuit Research of Double-Sided Switched Reluctance Linear Machine

This paper proposes a three-dimensional magnetic equivalent circuit (3D MEC) method to analyze the flux linkage characteristics and electromagnetic force characteristics of double-sided switched reluctance linear machine (DSRLM). The 3D finite element model (3D FEM) of DSRLM is established to analyze the magnetic field line distribution of the motor. The magnetic field distribution of two representative positions (unaligned and aligned position) is mainly analyzed, and the reluctance of each part was obtained by the magnetic flux tube method. According to the similarity principle, the magnetic flux tube with irregular shape is equivalent to a simple magnetic circuit that is easy to calculate. According to the similarity of the magnetic circuit and electric circuit, the 3D MEC model of DSRLM was established. The Gauss–Seidel iteration method is used in MATLAB to solve the flux linkage-current curves at two representative positions. Then the flux linkage curves calculated by the MEC method are compared with the 3D-FEM results and experimental results. After that, the flux linkage curves obtained by MEC are used to solve the electromagnetic force curves. And the electromagnetic force curves are compared with the curves obtained by FEM and experiment. It can be found that the error is within an acceptable range, indicating that the scheme is more feasible.