Title: Speed and rotor position estimation of PMSM by sequential sliding mode observers

Authors: Mihai Comanescu

Addresses: Penn State Altoona, 3000 Ivyside Park, Altoona, PA, 16601, USA

Abstract: The paper presents a speed and EMF estimator for the non-salient permanent magnet synchronous motor (PMSM). The method uses only the measured motor voltages and currents of the motor; estimation is done with two sliding mode (SM) observers that run sequentially. A first SM observer estimates the EMFs of the motor in the stationary reference frame. These are passed as inputs to a second SM observer that estimates the speed and reestimates the EMFs. The method is applicable in a sensorless speed controlled PMSM drive where the EMFs are used to provide field orientation and the estimated speed is used for speed feedback. The paper proves the convergence of the observers and discusses the design of the gains. The theoretical development is supported with simulation results and experimental tests. The advantages of the proposed method compared to the state of the art are discussed.

Keywords: permanent magnet synchronous motor; PMSM; rotor position estimation; speed estimation; sliding mode observers; sensorless speed control.

DOI: 10.1504/IJPELEC.2011.042804

International Journal of Power Electronics, 2011 Vol.3 No.6, pp.621 - 640

Received: 10 Jul 2010
Accepted: 12 Nov 2010

Published online: 04 Oct 2011 *

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