A nonlinear state observer for the sensorless control of apermanent-magnet AC machine
Guchuan Zhu
Kaddouri, A.
Dessaint, L.A.
Akhrif, O.
Electr. Eng. Dept., Ecole de Technologie Superieure, Montreal, Que.;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec 2001
Volume: 48,
Issue: 6
On page(s): 1098-1108
ISSN: 0278-0046
References Cited: 22
CODEN: ITIED6
INSPEC Accession Number: 7122716
Digital Object Identifier: 10.1109/41.969388
Current Version Published: 2002-08-07
Abstract
This paper presents a sensorless speed regulation scheme for a
permanent-magnet synchronous motor (PMSM) based solely on the motor line
currents measurements. The proposed scheme combines an exact
linearization-based controller with a nonlinear state observer which
estimates the rotor position and speed. Moreover, the stability of the
closed-loop system, including the observer, is demonstrated through
Lyapunov stability theory. The proposed observer has the advantage of
being insensitive to rotation direction. It is shown how a singularity
at zero velocity appears in the scheme and how it can be avoided by
switching smoothly from the observer-based closed-loop control to an
open-loop control at low velocity. The system performance is tested with
an experimental setup consisting of a PMSM servo drive and a
digital-signal-processor-based controller for both unidirectional and
bidirectional speed regulation
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