A speed-sensorless IM drive with decoupling control and stabilityanalysis of speed estimation
Suwankawin, S.; Sangwongwanich, S.
Industrial Electronics, IEEE Transactions on
Volume 49, Issue 2, Apr 2002 Page(s):444 - 455
Digital Object Identifier 10.1109/41.993278
Summary:A new sensorless drive based on a decoupling control and an
adaptive full-order observer is developed. A modified decoupling control
is introduced and integrated with the adaptive observer to reduce the
complexity of the whole system. The speed estimation based on adaptive
control theory is analyzed and the necessary and sufficient conditions
for stability of the speed estimation are analytically derived. It is
indicated that the system can be unstable in the low-speed region with
regenerative loads. However, assigning an appropriate feedback gain to
the adaptive observer can restore the stability and reduce the unstable
region. Sensitivity of the sensorless drive against parameter and
measurement errors is also qualitatively discussed. Simulation and
experimental results are then given to verify the validity of the
theoretical results
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