Pulsating Torque and Losses in Multiphase Induction Machines

Steve Williamson, Sandy Smith

    Research output: Contribution to journalArticlepeer-review


    In this paper, the authors take a high-level look at multiphase induction machines in order to examine those aspects that are not design specific. They show that for a machine in which the only design variable is the phase number; the main target for loss reduction is the stator copper loss, which by the use of more than three phases may be attenuate by as much as 8.5%. In addition, a general expression for the harmonic fields produced when a machine having any phase number is excited from a pwm inverter is derived, and the sources of torque pulsation are identified.
    Original languageEnglish
    Pages (from-to)986-993
    Number of pages7
    JournalIEEE Transactions on Industry Applications
    Issue number4
    Publication statusPublished - Jul 2003


    • Induction machines
    • Multiphase machines


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