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Voltage and horsepower

Follow formula to run motor on less-than-nameplate voltage

  • May 1999
  • Number of views: 4740
  • Article rating:

Chuck Yung 
EASA Technical Support Specialist 

You may have experienced this situation before: Your best customer just called to say he has a plant down and is in desperate need of a 100 HP, 6-pole, 460-volt motor.  And he needs it now! 

You check your stock and find one that's pretty close. The frame is right, but it's a 125 HP unit at 575 volts. What can you do? You know that the motor will run at 460 volts, but how much horsepower will it produce? 

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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards

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