Sensorless control of induction motor drives equipped with inverter output filter

Janne Salomäki, Marko Hinkkanen, Jorma Luomi

    Research output: Contribution to journalArticleScientificpeer-review

    48 Citations (Scopus)


    This paper deals with the speed sensorless vector control of an induction motor in a special case where the output voltage of the pulsewidth-modulated inverter is filtered by an inductance-capacitance (LC) filter. The system states are estimated by means of an adaptive full-order observer, and no additional voltage, current, or speed measurements are needed. The rotor speed adaptation is based on the estimation error of the inverter output current. Quasi-steady-state and linearization analyses are used to design an observer that enables a wide operation region, including very low and very high speeds. A torque-maximizing control method is applied in the field-weakening region. Simulation and experimental results show that the performance is comparable to that of a drive without the LC filter.
    Original languageEnglish
    Pages (from-to)1188-1197
    JournalIEEE Transactions on Industrial Electronics
    Issue number4
    Publication statusPublished - 7 Aug 2006
    MoE publication typeA1 Journal article-refereed


    • adaptive full-order observer
    • induction motor drives
    • inverter output filter
    • speed sensorless
    • vector control


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