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Is the torque that an electric motor provides the same that is required to turn it when not powered? Answered

A 30 hp electric motor provides 158 ft-lbs of torque when rotating at a rate of 1000 rpm. Does the same electric motor require 158 ft-lbs to be cranked at the same speed?

Think of it as using any electric motor as an electric generator like in a windmill.

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seandogue

4 years ago

My best guess is no.

If loaded? Plus losses.

If not? far less torque should be required, since you're not dealing with back EMF

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iceng

4 years ago

You want to know if that 30hp machine as a generator will need the same

158 ft-lbs at 1000rpm to generate an output of 22 KW ( 30 x 746 = 22380 W )

Yes it will !

BTW .... HP = Torque x Speed / 5252 = 158 x 1000 / 5252 = 30.08

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steveastrouk

4 years ago

If you want 30hp OUT of the generator, then yes, you need 158 ft-lbs or whatever to drive it at that speed./