High Performance Sensorless DTC-CSI Fed Induction Motor Drives for Low Speed Operation with Minimum Ripple Torque
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Speed sensorless control allowing operation at low and zero speed and optimizing torque response and efficiency. Torque ripple is a major difficulty in direct torque controlled induction motors. The reference value of the motor flux greatly influences the torque ripple. In this paper, the effect of the reference value of the motor flux on the motor torque ripple is investigated and proposes a high performance novel direct torque controlled current source inverter fed induction motor drives operated at low speed with reducing torque ripple. The choice of the inverter switching vector is based on angular position of stator flux or rotor flux and on the reference and the motor current vectors in the switching vector plane. The performance of this control method has been demonstrated by simulations performed using a versatile simulation package, MATLAB / SIMULINK and verified experimentally on a digital signal processor. The results prove that the excellent characteristics for torque response, which confirm the validity of this control scheme
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