Electromagnetic vibration characteristics of permanent magnet synchronous motors with segmented grain-oriented electrical steel teeth-yoke

This paper proposes a novel topology of grain-oriented electrical steel permanent magnet synchronous motor (GO-PMSM) with spliced teeth-yoke structure for electric vehicles, aiming to address the vibration challenges under high power density demands. Two motors (GO-PMSM and NO-PMSM) with identical dimensions were designed. Through theoretical analysis and multiphysics finite element modeling, the magnetostrictive and electromagnetic force-induced vibrations were investigated. Simulations revealed that GO-PMSM exhibits 18.32% higher average torque and increased radial flux density due to anisotropic permeability. Experimental results demonstrated that the primary vibration sources are the 12th-order electromagnetic force harmonics (0th and 48th spatial orders) and the 10th/14th harmonics (8th spatial order). Notably, GO-PMSM shows significantly higher low-frequency vibration (below 1500 Hz) caused by magnetostriction in the teeth. This study highlights the trade-off between power density enhancement and vibration amplification in GO-PMSM, providing critical insights for high-performance motor design.