ac motor

General BVS related area
social misfit
Posts: 32
Joined: Thu Jul 03, 2008 6:53 pm
Location: dorset

ac motor

Postby social misfit » Tue Jun 02, 2009 11:32 am

just taken an induction motor of a old washing machine which has an operating current of 5.3 amps so the electrical hp is 1.7 does that relate to mechanical hp?

bobc
Posts: 107
Joined: Thu Dec 20, 2007 1:11 pm
Location: Knutsford

Postby bobc » Tue Jun 02, 2009 11:54 am

OK I have my calculator handy.... 240V x 5.3A = 1272VA
it's less watts going in because of "power factor" - the phase angle of the current. Wild guess power factor = 0.75, that's 954W into the motor.
How efficient is it? who knows - guess at 75% again - that's 715W mechanical output.
715W is 0.96horsepower.
Reality - it will be between 0.5 & 1 horsepower


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