An Improved Torque Density Pseudo Six-Phase Induction Machine Using a Quadruple Three-Phase Stator Winding

Research output: Contribution to journalArticle


The nine-phase six-terminal induction machine has recently been proposed as a promising contender to the conventional six-phase asymmetrical winding machine in terms of torque density, phase current quality, stator winding simplicity, and fault-tolerant capability. However, the relatively lower dc-link voltage utilization of a single neutral arrangement in multiphase machines with multiple three-phase windings represents, in general, a technical challenge when compared to windings with isolated star points. Therefore, this paper proposes a new pseudo six-phase winding layout suitable for medium-voltage high-power induction machines, which employs quadruple three-phase stator winding sets, while providing the same terminal behavior of a nine-phase six-terminal winding. Additionally, like the traditional six-phase winding, two possible neutral arrangements can be configured. The proposed winding configuration provides the same dc-link voltage utilization as in conventional dual three-phase winding machines with isolated neutrals. The effect of the circulating zero-sequence current component experienced with a single neutral arrangement can also be avoided. A 1.5 Hp prototype induction machine is used to experimentally validate the proposed six-phase winding layout under both healthy and fault conditions.

Original languageEnglish
Article number8657949
Pages (from-to)1855-1866
Number of pages12
JournalIEEE Transactions on Industrial Electronics
Issue number3
Publication statusPublished - Mar 2020


  • Fault-tolerant operation
  • high-power machines
  • nine-phase six-terminal winding
  • optimal current control
  • quadruple three-phase winding
  • six-phase machines
  • vector space decomposition

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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