On the causes of circulating currents in PWM drives with open-end winding AC machines

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

Research output: Contribution to journalArticlepeer-review

93 Scopus citations


Electric drives with open-end winding ac machines offer certain advantages over drives with star-or delta-connected machines. Such drives have been recently considered for some applications such as electric vehicles. Circulating currents have been experimentally observed in such open-end winding ac drives. These currents have the effect of increasing conduction losses in the stator winding resistance of the ac machine. Two major causes for these currents have been identified as device voltage drops in power semiconductor devices and dead time used for shoot-through current protection. These effects are analyzed, and a mathematical description for predicting their severity is provided. Experimental results are presented that support the theory. The theory developed should be useful for devising solutions for this problem such as the design of common-mode filters. Two methods of suppressing the circulating currents are also outlined, and their experimental results are presented.

Original languageEnglish (US)
Article number6238343
Pages (from-to)3670-3678
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number9
StatePublished - 2013


  • Circulating current
  • common-mode voltage
  • matrix converter
  • open-end winding machine


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