Suppression to Radial Force and Torque Ripple of Concentrated PMSM with Double Independent Three-Phase Windings

This paper proposes a machine structure and control method for low vibration of PMSM. Torque ripple and radial force cause vibration. Sixth-order torque and sixth-order radial force are the focus of attention in this paper. However, it is difficult to suppress to them by using the conventional inverter driven PMSM structure. Therefore, this paper proposes that the degree of freedom has been increased by adopting multiple winding with winding deviations. The proposed method suppresses the sixth-order radial force by superimposition of harmonic current and negate the sixth-order torque by the PMSM structure. The proposed method was confirmed by simulation and experiment. The radial force is evaluated by measuring the radial acceleration on the motor surface. The sixth-order component of the acceleration in the radial direction was reduced by 73.3%. The sixth-order torque component is smaller than the main torque component, for this reason, it was suppressed by its structural characteristics.