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A speed-sensorless state feedback controller for induction machines (IMs)with LC filter is proposed. The estimation of speed and remaining states isbased on a speed-adaptive observer, requiring only the measurement of thefilter input currents. The motor currents are controlled by a state-feedbackcontroller with proportional and integral control action to achieve fast andasymptotic set point tracking. Observer \emph{and} controller gains arecalculated offline using linear quadratic regulator (LQR) theory and updatedonline (gain-scheduling), in order to guarantee stability and improve controlperformance in the whole operation range. The proposed control scheme isvalidated by simulation and experimental results including severalzero-crossings of the mechanical speed. It is shown that the overall controlsystem performs well under various load- and speed conditions; while its tuningremains easy making it attractive also for industrial application.

Speed-sensorless state feedback control of induction machines with LC filter