Signal injection and averaging for position estimation of Permanent-Magnet Synchronous Motors

2012/03/26 by Al Kassem Jebai, François Malrait, Jebai, Al Kassem +5 · 1 citation
Engineering · #Sensorless Control of Electric Motors #Electric Motor Design and Analysis #Magnetic Bearings and Levitation Dynamics

paper · pdf · doi:10.48550/arxiv.1203.5672

Abstract

Sensorless control of Permanent-Magnet Synchronous Motors at low velocity remains a challenging task. A now well-established method consists in injecting a high-frequency signal and use the rotor saliency, both geometric and magnetic-saturation induced. This paper proposes a clear and original analysis based on second-order averaging of how to recover the position information from signal injection; this analysis blends well with a general model of magnetic saturation. It also experimentally demonstrates the relevance for position estimation of a simple parametric saturation model recently introduced by the authors.

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