Open Access Open Access  Restricted Access Subscription or Fee Access

Direct Torque Control Strategy Based on Constant Switching Frequency Applied in Current Source Inverter Fed Induction Motor Drive

(*) Corresponding author

Authors' affiliations



The new direct torque control (DTC) strategy based on constant switching frequency of current converter fed (CSI) induction motor drive is presented. The goal of this work is to obtain better performances than exist in similar vector controlled drive, but with reduced control structure and its simpler implementation in the microprocessor system. Contrary to the direct torque control of CSI drive presented in the known literature without experimental results, proposed algorithm is based on constant switching frequency with modification of the inverter optimal switching table. With such a solution, problems detected under DTC using torque hysteresis controller are avoided (significant torque pulsations, requirement for filtering estimated torque and adaptation of hysteresis bandwidth in depend of motor speed). Performance analysis of the recommended control algorithm is tested by PC simulations and through implementation in the realized drive prototype with a standard thyristor type frequency converter.
Copyright © 2018 Praise Worthy Prize - All rights reserved.


DTC; CSI; Induction Motor

Full Text:



I.Takahashi and T.Noguchi, A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor, IEEE Trans. on Industry Applications, Vol. 22, 1986, pp. 820-827.

M.Depenbrok, Direct Self-Control (DSC) of Inverter-Fed Induction Machine, IEEE Trans. on Power Electronics, Vol.4, 1988, pp. 420-429.

P.Tiitinen, P.Pohjalainen and J.Lalu, The next generation motor control method: Direct Torque Control (DTC), European Power Electronics Journal, Vol.5, 1995, pp. 14-18.

G.Buja, D.Casadei and G.Serra, Direct Stator Flux and Torque Control of an Induction Motor: Theoretical Analysis and Experimental Results, The IEEE International Conference on Industrial Electronics IECON '98, Bologna, Italy

P.Vas, Sensorless Vector and Direct Torque Control (Oxford University Press, U.K., 1998).

I.Boldea, Direct Torque and Flux (DTFC) of A.C. Drives: A Review, The 9th Conference EPE-PEMC 2000, Kosice, Slovakia

N. R. Zargari, S. C. Rizzo, Y. Xiao, H. Iwamoto, K. Satoh, and J. F. Donlon, A new current-source converter using a symmetric gate-commutated thyristor (SGCT), IEEE Transactions on Industry Applications, Vol.37, 2001, pp. 896-903.

D.Casadei, G.Serra, A.Tani, L.Zarri and F.Profumo, Performance Analysis of a Speed-Sensorless Induction Motor Drive Based on a Constant-Switching-Frequency DTC Scheme, IEEE Transactions on Industrial Applications, Vol.39, 2003, pp. 476-484.

A.B.Nikolic, B.I.Jeftenic, Speed Sensorless Direct Torque Control Implementation in a Current Source Inverter Fed Induction Motor Drive, The 35th IEEE Power Electronics Specialist Conference, July 2004, Aachen, Germany.

J.Holtz, Drift- and Parameter-Compensated Flux Estimator for Persistent Zero-Stator-Frequency Operation of Sensorless-Controlled Induction Motors, IEEE Transactions on Industrial Applications, Vol.39, 2003, pp. 1052-1060.

A.Nikolic, B.Jeftenic, Precise Vector Control of CSI Fed Induction Motor Drive, European Transactions on Electrical Power, Vol.16, March 2006, pp. 175-188.

A.Nikolic, B.Jeftenic, Improvements in Direct Torque Control of Induction Motor Supplied by CSI, The 32nd IEEE Industrial Electronics Society Conference IECON 2006, November 2006, Paris, France.


  • There are currently no refbacks.

Please send any question about this web site to
Copyright © 2005-2022 Praise Worthy Prize