Multi-Objective Optimization of Permanent Magnet Synchronous Motor Considering Electromagnetic-Structural Coupling

This paper proposes a multi-objective optimization method based on electromagnetic-structural coupling for permanent magnet synchronous motor. The proposed method is aimed at simultaneously meeting the electromagnetic and structural performance requirements of aerospace motors. An analytical model is established for the strength and stiffness of each component in a permanent magnet synchronous motor. The analytical model is combined with the electromagnetic finite element model. A multi-objective genetic algorithm is used for the coupled electromagnetic-structural optimization. This method ensures high torque density, high efficiency, and high mechanical reliability. The optimized motor can withstand three times the mechanical overload, achieving 94.5% efficiency and a torque density of 8.2 N·m/kg. Finally, a prototype is manufactured and experiments are conducted to validate both the theoretical analysis and the proposed optimization method.