Optimum Design Criteria for Maximum Torque and Efficiency of a Line-Start Permanent-Magnet Motor Using Response Surface Methodology and Finite Element Method

This paper deals with optimum design criteria for maximum torque density and efficiency of a single phase line-start permanent-magnet motor (LSPMM) using response surface methodology (RSM) and finite element method (FEM). The focus of this paper is to find a design solution through the comparison of maximum torque density and efficiency resulting from rotor shape variations. Then, a central composite design (CCD) mixed resolution is introduced, and the motor parameters meeting the required efficiency and maximum torque are determined by the characteristic map obtained by the d-q axis equivalent circuit analysis. Then the geometric shape design satisfying the motor parameters are performed. In the end, the improved LSPMM is fabricated and tested in order to measure the maximum torque and efficiency.