Sensorless rotor velocity tracking control for induction motors

We present a sensorless control algorithm that achieves semi-global exponentional rotor velocity tracking for the full-order, nonlinear dynamic model of an induction motor actuating a mechanical subsystem. The proposed controller utilizes stator current measurements but is termed sensorless due to the inexpensive/simplistic manner in which stator current measurements can be obtained (e.g., relatively inexpensive Hall effect current sensors can be used to obtain current measurements). The control strategy utilizes a novel rotor velocity observer which facilitates the potential for improved rotor velocity tracking transient performance.

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