Title: Sensorless rotor position estimation of PMSM by full-order and sliding mode EMF observers with speed estimate
Authors: Mihai Comanescu
Addresses: Penn State Altoona, 3000 Ivyside Park, Altoona, PA, USA
Abstract: The paper discusses the problem of rotor position estimation for the nonsalient PMSM and presents a Full-Order (FO) observer and a Sliding Mode (SM) observer; both are constructed using a speed estimate. The observers are developed using the PMSM model in the stationary reference frame and use the motor voltages, currents and speed as inputs. The PMSM is treated as a time-varying plant. Convergence is analysed assuming that the speed signal is inaccurate - this corresponds to the situation when a speed estimate is used to obtain a sensorless observer. Under improper speed, the FO observer gives errors; however, the SM observer can be forced to converge by increasing the gains. The SM structure proposed allows design of a variety of sensorless observers.
Keywords: PMSM; permanent magnet synchronous motors; rotor position estimation; full-order observers; sliding mode control; SMC; sensorless control; hybrid vehicles; hybrid electric vehicles; HEVs; speed estimation.
International Journal of Vehicle Autonomous Systems, 2013 Vol.11 No.2/3, pp.157 - 189
Received: 20 Apr 2011
Accepted: 20 Jun 2011
Published online: 09 May 2013 *