Flux Characteristics Analysis of a Novel Two-Degree-of-Freedom Tubular Linear Rotary Switched Reluctance Machine

This article analyzes the flux characteristics of a novel two-degree-of-freedom tubular linear rotary switched reluctance motor (TLRSRM). First, the basic structure and operation principle of TLRSRM are introduced, and based on the complex magnetic circuit of TLRSRM, the magnetic equivalent circuit (MEC) method is adopted to calculate and analyze the linear and rotary motion parts of TLRSRM, respectively. Specifically, the equivalent magnetic network models for two key motion positions of the motor stator-rotor in aligned and unaligned positions are modeled. Based on the 2-D magnetic circuit analysis method, the magnetic circuit splitting method is used to derive the analytical equation of the air-gap permeability of the equivalent magnetic circuit. The core reluctance and air-gap reluctance of the motor are solved by mathematical modeling to obtain the winding inductance and flux linkage characteristics of the motor and compared with 3-D finite element analysis. The results show that the flux characteristic data of the stator-rotor key motion positions calculated by MEC and the data from 3-D finite element method (FEM) are consistent, which verifies the validity and correctness of the MEC model. This provides guidance for the optimized design of the proposed TLRSRM.