Electromagnetic Analysis of PMSM with Eccentricity and Rotor Magnetization Variations

Interior PMSMs are particularly well-suited for EV propulsion due to their compact design and strong magnetic flux linkage, but their performance is significantly impacted by mechanical and electromagnetic phenomena such as eccentricity and rotor uneven magnetization. Using finite element simulations, the study evaluates radial forces on stator teeth under various eccentricity scenarios, including static, dynamic, and mixed eccentricities, and analyzes the influence of uneven magnetization.

Results show that eccentricity leads to asymmetric force distributions, and increasing mechanical stresses, while uneven magnetization exacerbates torque ripple and NVH issues. The findings highlight the complex interplay between these factors and emphasize the need for precise manufacturing and advanced multi-physics simulations to optimize PMSM design for EV applications.