Direct-matrix-converter-based drive for a three-phase open-end-winding AC machine with advanced features

Ranjan K. Gupta, Krushna K. Mohapatra, Apurva Somani, Ned Mohan

Research output: Contribution to journalArticlepeer-review

129 Scopus citations


This paper describes how matrix converters (MCs), one at each side of a three-phase open-end-winding ac machine, achieve the following features simultaneously: 1) machine phase voltage up to 1.5 times the input phase voltage in the linear modulation mode, therefore extending the rated torque operation region to 150% of the rated speed of the machine; 2) peak voltage stress across the slot insulation which is limited to the peak of input phase voltage, i.e., a factor of at least $\sqrt{3}$ lower as compared to the conventional back-to-back converter; 3) controllable grid power factor to be leading, lagging, or unity; and 4) elimination of the instantaneous common-mode voltage at the machine terminals, therefore eliminating the bearing current due to switching common-mode voltage and reduction in the conducted electromagnetic interference. To simultaneously achieve the aforementioned capabilities, a space vector pulsewidth modulation technique is described in which the MCs are modulated using only rotating space vectors. A hardware prototype of the drive system is built. Experimental results from this hardware prototype verify the operation and claims of the drive system.

Original languageEnglish (US)
Article number5416289
Pages (from-to)4032-4042
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number12
StatePublished - Dec 2010

Bibliographical note

Funding Information:
Manuscript received December 15, 2009; accepted January 14, 2010. Date of publication February 18, 2010; date of current version November 10, 2010. This work was supported by the Office of Naval Research under Grant N00014-07-1-0463.


  • Bearing current and conducted electromagnetic interference (EMI)
  • common-mode voltage
  • matrix converter (MC)
  • open-end-winding machine


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