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Effect of voltage variation on induction motor characteristics

Publication date: 
February 2011
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. "Table 1: Typical effects of voltage change" explains numerically the relationships between various motor performance parameters and a dynamic power supply subject to variation. It was featured in a paper by P. Pillay at an IEEE Petroleum and Chemical Industry Committee (PCIC) conference in 1995 and is shown on Page 24 in EASA's Electrical Engineering Pocket Handbook. The table was a subject of discussion at the recent meeting of the EASA Technical Services Committee in St. Louis. One purpose of this article is to better utilize the information in this table.

AC motors