Low-speed control improvements for a two-level five-phase inverter-fed induction machine using classic direct torque control

L. L. Gao, J. E. Fletcher, L. B. Zheng

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

A novel technique that improves the low-speed performance of a five-phase induction machine (IM) driven by a two-level inverter using the classic direct torque control (DTC) technique is presented. Demagnetization of the stator flux is investigated when the IM runs at lower speeds, and a solution is provided to overcome this phenomenon. The proposed technique reduces the demagnetization phenomenon by using the +/- 36 degrees displaced voltage vector during low-speed operation but employs the +/- 72 degrees displaced voltage vectors otherwise. The demagnetization of the stator flux is shown by simulation and experiment to be eliminated using the proposed technique. It can be observed that the proposed technique can significantly improve the rate of change of stator flux, the torque response, and the speed response compared with traditional method.
Original languageEnglish
Pages (from-to)2744-2754
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume58
Issue number7
DOIs
Publication statusPublished - Jul 2011

Keywords

  • ripple reduction
  • two-level five-phase inverter
  • motor-drives
  • five-phase induction machine (IM)
  • stator flux
  • demagnetization
  • switching frequency
  • vector control
  • direct torque control (DTC)
  • low-speed control
  • improvements
  • inverter-fed
  • induction machine
  • direct torque control

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