Vibration Suppression of Fractional-slot Distributed Winding PMSMs Considering Radial Force Modulation Effect

A new vibration suppression method for a fractional-slot distributed winding permanent magnet synchronous machine (FSDW-PMSM) is proposed by considering the influence of the radial force modulation effect on FSDW-PMSMs. First, the vibration source of the FSDW-PMSMs is analyzed, and the principle of radial force modulation is revealed. Afterwards, the radial force distribution characteristics are studied, and the radial force component that contributes to the dominant vibration is identified. The PM flux density harmonics in the air gap are suppressed using the harmonic injection method to reduce vibrations. Additionally, dual three-phase techniques are used to enhance the fundamental armature flux density, thereby improving torque capability. Consequently, the vibration performance of the FSDW-PMSM is improved without sacrificing the torque. Finally, the proposed method is validated through simulations and experiments.