Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications

Geun-Ho Lee

Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications

Geun-Ho Lee

Vol. 10, No. 2, pp. 176-180, Mar. 2010

10.6113/JPE.2010.10.2.176

Electric power steering

Magnetic saturation

Permanent magnet synchronous motor

Torque ripple reduction

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Abstract

This paper deals with a control method to reduce the torque ripple of a permanent magnet synchronous motor (PMSM) for electric power steering (EPS) systems. Such an application requires a very low torque ripple in order to maintain a good steering feel. However, because of spatial limitations, it cannot help having a partial saturation in the iron core of the PMSM for an EPS system, and this saturation results in a significant torque ripple. Thus, this paper analyzes the torque ripple caused by the magnetic saturation of a PMSM and proposes a method with respect to inductance measurement to verify the partial saturation. In addition, it is shown that a compensation current is needed in order to minimize the torque ripple when a PMSM is driven in the high torque region. The estimation process of the current and the torque ripple decreased by the current are presented and verified with test results.

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Cite this article

[IEEE Style]

G. Lee, "Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications," Journal of Power Electronics, vol. 10, no. 2, pp. 176-180, 2010. DOI: 10.6113/JPE.2010.10.2.176.

[ACM Style]

Geun-Ho Lee. 2010. Active Cancellation of PMSM Torque Ripple Caused by Magnetic Saturation for EPS Applications. Journal of Power Electronics, 10, 2, (2010), 176-180. DOI: 10.6113/JPE.2010.10.2.176.