Three-phase to seven-phase power converting transformer

Shaikh Moinoddin, Atif Iqbal, Haitham Abu-Rub, M. Rizwan Khan, Sk Moin Ahmed

Research output: Contribution to journalArticle

17 Citations (Scopus)


Multiphase (more than three-phase electric power) electric drive system is the focus of a significant research in the last decade. Multiphase power transmission system is also investigated in the literature because multiphase transformers are needed at the input of rectifiers. In the multiphase power transmission and multiphase rectifier systems, the number of phases investigated is a multiple of three. However, the variable speed multiphase drive system considered in the literature are mostly of five, seven, nine, eleven, twelve, and fifteen phases. Such multiphase drive systems are invariably supplied from power electronic converters. In contrast, this paper proposes technique to obtain seven-phase output from three-phase supply system using special and novel transformer connections. Thus, with the proposed technique, a pure seven-phase sine-wave voltage/current is obtained, which can be used for motor testing purposes. In addition, a seven-phase power transmission and rectifier system may benefit from the proposed connection scheme. Complete design and testing of the proposed solution is presented. Analytical analysis, simulation, and experimental verifications are presented in the paper.

Original languageEnglish
Article number6236117
Pages (from-to)757-766
Number of pages10
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - 17 Jul 2012



  • Converting transformer
  • multiphase drive systems
  • multiphase system
  • multiphase transmission
  • three-to-seven phase

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Moinoddin, S., Iqbal, A., Abu-Rub, H., Rizwan Khan, M., & Moin Ahmed, S. (2012). Three-phase to seven-phase power converting transformer. IEEE Transactions on Energy Conversion, 27(3), 757-766. [6236117].