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Effect of voltage variation on induction motor characteristics

  • February 2011
  • Number of views: 2319
  • Article rating: 4.5

Jim Bryan
EASA Technical Support Specialist

What is voltage variation? Voltage variation is the deviation of voltage from the rated voltage; NEMA MG1 Section 12 allows a plus or minus 10% variation from rated voltage. That rat­ing assumes balanced voltages and acknowledges that motor performance will not necessarily be the same as at rated voltage.  Note: The tolerance for voltage unbalance is only 1%, an order of magnitude less than the 10% voltage variation tolerance. For more informa­tion on this subject, see the December 2007 edition of Currents for an article on voltage unbalance titled “Unbalanced Voltages and Electric Motors.”

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