A novel vector control strategy for a six-phase induction motor with low torque ripples and harmonic currents

Research output: Contribution to journalArticleScientificpeer-review


  • Hamidreza Heidari
  • Anton Rassõlkin
  • Toomas Vaimann
  • Ants Kallaste
  • Asghar Taheri
  • Mohammad Hosein Holakooie
  • Anouar Belahcen

Research units

  • Tallinn University of Technology
  • Zanjan University


In this paper, a new vector control strategy is proposed to reduce torque ripples and harmonic currents represented in switching table-based direct torque control (ST-DTC) of a six-phase induction motor (6PIM). For this purpose, a new set of inputs is provided for the switching table (ST). These inputs are based on the decoupled current components in the synchronous reference frame. Indeed, using both field-oriented control (FOC) and direct torque control (DTC) concepts, precise inputs are applied to the ST in order to achieve better steady-state torque response. By applying the duty cycle control strategy, the loss subspace components are eliminated through a suitable selection of virtual voltage vectors. Each virtual voltage vector is based on a combination of a large and a medium vector to make the average volt-seconds in loss subspace near to zero. Therefore, the proposed strategy not only notably reduces the torque ripples, but also suppresses the low frequency current harmonics, simultaneously. Simulation and experimental results clarify the high performance of the proposed scheme.


Original languageEnglish
Article number1102
Number of pages14
Issue number6
Publication statusPublished - 21 Mar 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Direct torque control, Duty cycle control, Harmonic currents, Six-phase induction motor, Torque ripple

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