International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2557

Full Length Research Paper

Improvement of direct torque control in high power induction motors

A. Gandomkar1*, A. Mahmoudi1,2, H. Pirasteh3, A. Parastar4 and S. Kahourzade1
1Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia. 2Engineering Department, HELP College of Arts and Technology, Jalan Metro Pudu 2, Fraser Business Park, 55200 Kuala Lumpur. Malaysia. 3Electrical Engineering Department, K. N University of Technology, Tehran, Iran. 4Department of Electrical Engineering, Yeungnam University, Daegu, South Korea.  
Email: [email protected]

  •  Accepted: 11 May 2011
  •  Published: 18 June 2011


Matrix converter rather than voltage source inverter can be used as high-performance technique supplying electric motor in direct torque control (DTC). DTC’s most significant deficiency in induction motor, magnetic torque ripple, can be markedly reduced by appropriate space voltage-vectors whose influence on stator flux and electromagnetic torque in DTC of induction machine that uses “matrix converter” the subject of this work. DTC degrees of freedom were shown seriously limited by 60° flux sectors, thus division to twelve 30° sectors of flux-space vector hexagon is proposed. The increased “matrix converter” degrees of freedom were then extracted for DTC implementation.


Key words: Induction motor, direct torque control, matrix converter.