A New Approach to Direct Torque Control for Induction Motor Drive Using Amplitude and Angle of the Stator Flux Control

  • Kumsuwan, Yuttana (Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Thailand) ;
  • Premrudeepreechacharn, Suttichai (Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Thailand) ;
  • Toliyat, Hamid A. (Department of Electrical and Computer Engineering, Texas A&M University, College Station)
  • Published : 2008.03.01


This paper proposes the design and implementation of a direct torque controlled induction motor drive system. The method is based on control of decoupling between amplitude and angle of reference stator flux for determining reference stator voltage vector in generating PWM output voltage for induction motors. The objective is to reduce electromagnetic torque ripple and stator flux droop which result in a decrease in current distortion in steady state condition. In addition, the proposed technique provides simplicity of a control system. The direct torque control is based on the relationship between instantaneous slip angular frequency and rotor angular frequency in adjustment of the reference stator flux angle. The amplitude of the reference stator flux is always kept constant at rated value. Experimental results are illustrated in this paper confirming the capability of the proposed system in regards to such issues as torque and stator flux response, stator phase current distortion both in dynamic and steady state with load variation, and low speed operation.


  1. I. Takahashi and T. Noguchi, 'A new quick response and high efficiency control strategy of an induction motor,' IEEE Trans. Ind. Applicat., vol. IA-22, no. 5, Sep./Oct., 1986, pp. 820-827
  2. P.Vas, Sensorless Vector and Direct Torque Control, Editor, London, U.K.: Oxford Univ. Press, 1998
  3. W.S.H. Wong and D. Holliday, 'Minimization of flux droop in direct torque controlled induction motor drives,' IEE Proc. Electr. Power Appl., vol. 151, no. 6, Nov. 2004, pp. 694-703
  4. T.G. Habetler, F. Profumo, M. Pastorelli, and L.M. Tolbert, 'Direct torque control of induction motor using space vector modulation,' IEEE Trans. Ind. Applicat., vol. 28, no. 5, Sep./Oct., 1992, pp. 1045-1053
  5. P.Z. Grabowski, M. P. Kazmierkowski, B. K. Bose, and F. Blaabjerg, 'A simple direct-toque neuro-fuzzy control of PWM-inverter-fed induction motor drive,' IEEE Trans. Ind. Electron., vol. 47, Aug. 2000, pp. 863-870
  6. C. Lascu, I. Boldea, and F. Blaabjerg, 'A modified direct torque control for induction motor sensorless drive.' IEEE Trans. Ind. Applicat., vol. 36, no. 1, Jan. /Feb. 2000, pp. 122-130
  7. Y.S Lai and J.H. Chan 'A new approach to direct toque control of induction motor drive for constant inverter switching frequency and torque ripple reduction' IEEE Trans. Energy Convers., vol. 16, no. 3, Sept. 1992, pp. 220-227
  8. L. Tang, L. Zhong, A.F.Rahman, and Y. Hu, 'An investigation of a modified direct torque control strategy for flux and torque ripple reduction for induction machine drive system with fixed swiching frequency,' in Conference Record IEEE IAS Annual Meeting., vol. 2, 2002, pp. 837-844
  9. J. Zhang and M.F.Rahman, 'Analysis and design of a novel direct flux control scheme for induction machine,' in Conference Record IEMC'05., 2005, pp. 426-430
  10. J. Hu and B. Wu, 'New integration algorithms for estimating motor flux over a wide speed range,' IEEE Trans. Power Electron., vol. 13, Sept., 1996, pp. 969-977