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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 2006

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Assessment of direct torque control for induction motor drives

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Casadei D. , Serra G. , Tani A. , Zarri L.

2006

tom Vol. 54, nr 3

237-254

Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque control in steady state and transient operating conditions to be obtained. However, the presence of hysteresis controllers for flux and torque could determine torque and current ripple and variable switching frequency operation for the voltage source inverter. This paper is aimed to analyze DTC principles, the strategies and the problems related to its implementation and the possible improvements.