A nonlinear state observer for the sensorless control of apermanent-magnet AC machine
Guchuan Zhu; Kaddouri, A.; Dessaint, L.A.; Akhrif, O.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 6, Dec 2001 Page(s):1098 - 1108
Digital Object Identifier 10.1109/41.969388
Summary: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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