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Hybrid rotor position observer for wide speed-range sensorless PM motor drives including zero speed

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3 Author(s)
Silva, C. ; Dept. de Electron., Univ. Tecnica Federico Santa Maria, Valparaiso, Chile ; Asher, G.M. ; Sumner, M.

This paper addresses the problem of wide speed-range sensorless control of a surface-mount permanent-magnet (SMPM) machine including zero-speed operation. A hybrid structure integrating a flux observer and signal-injection techniques is proposed, which results in a rotor position signal independent of motor parameters at low and zero speed. Although the SMPM machine typically has a very low geometric saliency, the injection technique is effective in tracking the saturation-induced saliency produced by the stator flux. Experimental results are presented showing an excellent performance for both the sensorless speed and position control using an off-the-shelf SMPM machine.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 2 )