Sensorless Speed and Position Control of Induction Motors Tutorial

Controlled induction motor drives without me- chanical sensors for speed or motor shaft position have the attraction of low cost and high reliability. The identification of rotor speed is generally based on measured terminal volt- ages and currents. Dynamic models are used to estimate the magnitude and spatial orientation of the fundamental mag- netic flux waves in the stator or in the rotor. Open loop esti- mators and closed loop observers differ with respect to accu- racy, robustness, and sensitivity against model parameter variations. Dynamic performance and steady-state speed ac- curacy in the low speed range is achieved by exploiting para- sitic effects of the machine. The overview in this paper uses signal flow graphs of complex space vector quantities to pro- vide an insightful description of the systems used in sensor- less control of induction motors.

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