Analytical Calculation of Magnetic Circuit at Key Positions of Axial-radial Flux Switched Reluctance Rim Driven Motor

The Axial-radial Flux Switched Reluctance Rim Driven Motor (AFSR-RDM) is a ship propulsion motor with integrated propeller. Because of the axial-radial 3D structure of AFSR-RDM, the calculation of the magnetic circuit parameters cannot use the plane method of ordinary SRM. An analytical method using axial permeance compensation coefficients is proposed in this paper, which can simplify the magnetic circuit to the 2D plane and analyze the magnetic circuit parameters. The comparison with the results of 3D FEM proves that the calculation results of this method are accurate. Moreover, the Taguchi method is proposed to optimize the motor. The optimization variables are selected to the motor structure parameters, and the optimization objective is the electromagnetic torque and the electromagnetic torque density. The effectiveness of the method is verified by the FEM. After the optimization, the electromagnetic torque is improved and the torque ripple is reduced.