Comparison of a Reduced-Order Observer and a Full-Order Observer for Sensorless Synchronous Motor Drives

Two back-electromotive-force-based position observers are compared for motion-sensorless synchronous motor drives: the reduced-order observer and the adaptive full-order observer. A stabilizing gain is proposed for the adaptive full-order observer, which guarantees the local stability of the closed-...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2012-11, Vol.48 (6), p.1959-1967
Main Authors: Tuovinen, T., Hinkkanen, M., Harnefors, L., Luomi, J.
Format: Article
Language:English
Subjects:
Dynamic tests
Dynamics
Estimation error
Gain
Mathematical analysis
Motors
Observer
Observers
parameter uncertainties
permanent-magnet (PM) synchronous motor (PMSM)
Robustness
Rotors
sensorless
Stability analysis
stability conditions
Stators
Steady-state
Synchronous motors
synchronous reluctance motor (SyRM)
Vectors
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Summary:Two back-electromotive-force-based position observers are compared for motion-sensorless synchronous motor drives: the reduced-order observer and the adaptive full-order observer. A stabilizing gain is proposed for the adaptive full-order observer, which guarantees the local stability of the closed-loop system, if the motor parameters are known. Equations for the steady-state position error and for the linearized estimation-error dynamics under erroneous parameters are derived, and the robustness of the two observers against parameter errors is analyzed and compared. The observers are experimentally evaluated using a 6.7-kW synchronous reluctance motor drive in low-speed operation and under parameter errors. The gain selection of the reduced-order observer is easier, but the adaptive full-order observer can be made more robust against parameter variations and noise.
ISSN:0093-9994
1939-9367
1939-9367
DOI:10.1109/TIA.2012.2226200