Document Type : Original Article


1 Hakim Sabzevari University

2 Hakim Sabzevari University, Computer and electrical department


The conventional direct torque control (DTC) method suffers a flux drop at low speeds, which is due to the long selection of zero (neutral) voltage vectors in these speed areas. Past studies with the continuous switch of direct and reverse active vectors to achieve proper flux adjustment, this procedure causes high and consecutive overshoots in the hysteresis band that causes a sharp increase in the switching frequency and increase in the torque and current ripple, which means decrease in the drive efficiency. In this article, a modified method for setting the standard DTC current is introduced, which can be achieved by controlling only one band (low or high band) at low speeds. The introduced method by reducing the selection of zero voltage vectors and at the same time minimizing the number of reverse voltage vectors prevents the loss of flux in low speed areas. In addition, it is effective in reducing torque ripple and current in low speed mode and a significant reduction in switching frequency will also be achieved. The effectiveness of the proposed method in the simulation which is done in MATLAB software will be proved.


Main Subjects

[1]     Marulasiddappa HB, Pushparajesh V. Review on different control techniques for induction motor drive in electric vehicle. IOP Conf Ser Mater Sci Eng. 2021;1055(1):012142.
[2]     Faizal A, Miefthawati NP, Kurniawan R, Marzuki CC. Direct Torque Control Design with Fuzzy Sugeno-Propotional Derivative for 3-Phase Induction Motor Speed Control. 2023;10(1):111–20.
[3]     Maghfiroh H, Iftadi I, Sujono A. Speed Control of Induction Motor using LQG. J Robot Control. 2021;2(6).
[4] Dianguo Xu, Bo Wang, G. Zhang, G. Wang, Young Yu. A Review of Sensorless Control Methodsfor AC Motor Drives. Ces Trans Electr Mach Syst. 2018;2(1):104–15.
[5]  Kohlrusz G, Fodor D. Comparison of Scalar and Vector Control Strategies of Induction Motors. Hungarian J Ind Chem Veszprém. 2011;39(2):265–70.
[6] Tekam MS, Sharma DAK. Comparative Study of Field Oriented Control and Direct Torque Control of Induction Motor. Int J Sci Dev Res [Internet]. 2018;3(7):209–17. Available from:
[7]     A. B. Jidin, N. R. B. N. Idris, A. B. M. Yatim, M. E. Elbuluk, and T. Sutikno, "A Wide-Speed High Torque Capability Utilizing Overmodulation Strategy in DTC of Induction Machines With Constant Switching Frequency Controller," IEEE Trans. Power Electronics, vol. 27, no. 5, pp. 2566-2575, 2012.
[8]     J. N. Nash, "Direct torque control, induction motor vector control without an encoder," IEEE Trans. Ind. Appl., vol. 33, no. 2, pp. 333-341, MarchApril 1997.
[9]     D. Mohan, X. Zhang and G. H. B. Foo, "Three-Level Inverter-Fed Direct Torque Control of IPMSM With Torque and Capacitor Voltage Ripple Reduction," IEEE Trans. Energy Convers., vol. 31, no. 4, pp. 1559-1569, Dec. 2016.
[10]   Savarapu S, Qutubuddin M, Narri Y. Modified Brain Emotional Controller-Based Ripple Minimization for SVM-DTC of Sensorless Induction Motor Drive. IEEE Access. 2022;10:40872–87.
[11]   Yang Y, Wang Q, Shang J. Five-Level Hysteresis DTC of Open-End Winding Permanent Magnet Synchronous Motors with Zero-Sequence Currents Suppression and Torque Ripple Reduction. IEEE Access. 2022;10(October):121762–71.
[12]   Loncarski J, Monopoli VG, Leuzzi R, Cupertino F. Operation analysis and comparison of Multilevel Si IGBT and 2-level SiC MOSFET inverter-based high-speed drives with long power cable. ICCEP 2019 - 7th Int Conf Clean Electr Power Renew Energy Resour Impact. 2019;503–9.
[13]         I. M. Alsofyani, N. R. N. Idris, and Y. A. Alamri, "An improved flux regulation using a controlled hysteresis toque band for DTC of induction machines," in Proc. IEEE Conf. Energy Convers., 2015, pp. 368-372