In the mid 1980’s, Takahashi and Noguchi introduced another induction motor control technique called direct torque control (DTC) for low and medium power application (Lamchichi, 2014). In this method, stator voltage vector is selected according to the differences between the reference and actual torque and stator flux linkage. DTC has a relatively simple control structure but gives maximum result as well as the field oriented control (FOC), technique. It is also known that DTC drives is low sensitive to parameters variations and gives a high dynamic performances like fastest response of torque and flux than classical vector control. This method allows a decoupled control of flux and torque without using speed or position sensors, co-ordinate transformation, pulse width modulation (PWM) technique and current regulators. This type of command involves non-linear controller type of hysteresis, for both stator flux magnitude and electromagnetic torque.
But due to the principle of operation of these controllers which is based on the Boolean logic, none of the inverter switching vectors produced is able to generate the desired changes in torque and flux. However, torque and flux ripples composed a real problem in direct torque control induction motor drive (Faliha and Rachid, 2015).


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