6th and 12th order vibration suppression of IPMSM by harmonic current injection

Torque ripple reduction in PMSM(Permanent Magnet Synchronous Motor) for EVs drive motors is one of the technologies that reduce vibration. Torque ripple reduction techniques require accurate torque ripple modeling and estimation of motor parameters considering magnetic saturation and magnet temperature variation. Existing approaches that consider magnetic saturation and magnet temperature variation are complex and difficult to implement. Therefore, this study uses phasers to represent torque ripples. This allowed us to represent the torque ripple geometrically and to determine the harmonic currents for torque ripple reduction in a simplified manner. This method is also extended to vibration suppression by measuring vibration using an acceleration sensor. In this paper, experimental results of 6th and 12th order vibration suppression are presented by using the determination method of the harmonic current commands. From these results, vibration can be suppressed by installing an acceleration sensor at locations where vibration is to be suppressed.