A Variable Structure Magnetic Circuit Model of Novel Hybrid Excitation Flux Switching Motors

In order to make the flux switching motor(FSM) has both the energy saving effect and the ability of excitation adjustment, this paper presents a novel single-phase hybrid excitation flux switching motor(HEFSM), whose excitation MMF is provided by an excitation winding and a permanent magnet. The motor has a unique structure and a complex magnetic circuit. At the same time, a building method of magnetic circuit model is presented to research the motor's static characteristics. The method includes how to calculate the reluctance of the air gap and iron core without rebuilding the magnetic circuit equations when the magnetic circuit changes. To reflect magnetic permeability's nonlinear characteristic of the iron core, the interpolated method is adopted to solve the equation. A prototype was designed and manufactured, and the finite element simulation and experimental study was conducted. Comparing magnetic circuit model's calculation results with finite element analysis results and experiment results shows that the method can reflect the actual characteristics of the motor and provides a reference for the design and performance analysis of HEFSM.