ABSTRACT: Three control strategies are implemented and compared in this research: Vector Control, Continuous Time Sliding Mode Control and Discrete Time Sliding Mode Control of an induction motor. The induction motor model takes into account magnetizing inductance saturation and rotor resistance variation. While the magnetizing inductance is mapped to the operating conditions, the rotor resistance is estimated on-line. The motor is controlled with optimal efficiency flux. Flux weakening is employed above rated speed. The controllers are designed using simulation results. The simulation environment accounts for parameter mismatches. Several tests are performed on the experimental setup, accounting for low speed, high speed and rated speed operation. The experiments show the advantages and disadvantages of the control methods in respect to dynamic response, parameter mismatches, ease of implementation (algorithm complexity and tuning), stability of output(chaterring).
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