Comparison of a Reduced-Order Observer and a Full-Order Observer for Sensorless Synchronous Motor Drives
School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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IEEE Transactions on Industry Applications, Volume 48, Issue 6
AbstractTwo back-electromotive-force (EMF)-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.
observer, parameter uncertainties, permanent-magnet synchronous motor, sensorless, stability conditions, synchronous reluctance motor
Tuovinen, Toni & Hinkkanen, Marko & Harnefors, Lennart & Luomi, Jorma. 2012. Comparison of a Reduced-Order Observer and a Full-Order Observer for Sensorless Synchronous Motor Drives. IEEE Transactions on Industry Applications. Volume 48, Issue 6. 1959-1967. ISSN 0093-9994 (printed). DOI: 10.1109/tia.2012.2226200.