Abstract
In order to achieve a precise torque control of a mechanical actuator driven by an AC motor and governed by vector control (VC), it is necessary to know the motor’s rotoric resistance. VC requires that the AC motor mathematical model be known prior to any computation on control actions. Since the rotoric resistance changes with temperature fluctuations, it has to be estimated on line. This work develops a Kalman parameter estimator for determining the rotoric time constant of an asynchronous AC motor. The extended Kalman filter estimates the value of the rotor resistance based on the measurement of statoric currents and voltages, and rotor velocity. The estimation convergence time is very fast in relation to the variations of the rotoric time constant. The algorithm has been programmed in an 80486 PC which supervises an experimental VC system based on a 80C196MC microcontroller and supplies the estimation to the control system. This estimator is extendable to calculate other parameters of the asynchronous AC motor.
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