A Novel Repair Function for Enhancing Parametric Design Optimization of Internal Permanent Magnet Synchronous Motors with Asymmetric Rotor Poles

This work investigates the optimization of Internal Permanent Magnet Synchronous Motors, adopting a rotor with asymmetric poles to enhance torque output, reduce ripple, and minimize magnet mass. While the asymmetric poles configuration improves reluctance torque contribution and rotor dynamics, it introduces a high number of geometrical parameters, complicating the optimization process. To address this, a novel repair function is proposed, capable of handling complex geometrical constraints across 52 design variables. This approach, combined with a multi-objective NSGA-II optimization and FEM-based performance evaluation, enables a deeper exploration of feasible rotor geometries. The results show improved torque density and reduced ripple, while respecting manufacturing constraints.