Research on Torque Optimization of Outer Rotor Permanent Magnet Synchronous Motor Based on Response Surface Methodology

To optimize a 27-slot/24-pole outer-rotor permanent magnet synchronous motor (ORPMSM) for improved average output torque and reduced torque ripple, a torque optimization method based on response surface methodology (RSM) is proposed. The stator slot opening width, pole-arc coefficient, and permanent magnet thickness are selected as the key structural optimization variables. Through finite element analysis (FEA), a response surface model function is employed to perform regression fitting for different variable combinations. With the objectives of maximizing average output torque and minimizing torque ripple, a multi-objective optimization is conducted, yielding an optimal parameter solution. The results demonstrate that the RSM-based optimization method effectively enhances the motor's average output torque while reducing torque ripple, validating both the rationality of the RSM approach and the accuracy of the FEA simulations.