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-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.

Keywords

observer, parameter uncertainties, permanent-magnet synchronous motor, sensorless, stability conditions, synchronous reluctance motor

DOI

10.1109/TIA.2012.2226200

Citation

Tuovinen, T, Hinkkanen, M, Harnefors, L & Luomi, J 2012, ' Comparison of a reduced-order observer and a full-order observer for sensorless synchronous motor drives ', IEEE Transactions on Industry Applications, vol. 48, no. 6, pp. 1959-1967 . https://doi.org/10.1109/TIA.2012.2226200

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https://urn.fi/URN:NBN:fi:aalto-201805222710

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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Comparison of a reduced-order observer and a full-order observer for sensorless synchronous motor drives

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