Actually I just taught you a bunch of motor basics that many people are
ignorant of. They go to school, and think that physics classes are for
sleeping through. Then one day they need to pick a motor...
But it's good that you didn't. It only begs the question that if you're
so damn smart, why did you have to ask a question in the first place?
Go ahead and try to fix your broken system by putting a motor into it
that's way too big for the job. Then instead of making the number of
problems smaller, you -- or the poor bastard that inherits the result of
your maintenance 'genius' -- will have to fix it later, along with all
of the problems that it causes.
In the 1970's half the house fires my dad fought were from jokers that
"improved" their house wiring by putting pennies behind their fuses.
They were maintenance 'geniuses', too.
And you know what? If you come on this group again, asking how to
bypass your circuit breakers so that you can run 50 toasters in your
kitchen? I won't tell you how to do it! Instead, you'll get a lecture
on basic physics! And maybe even house fires!
Not just HP vs. RPM. Think winding. Doesn' tha motor has any speed taps?
If it is running at hi speed tap and bogging down, The motor is too
small. Byt other factors are duct size, blower blade pitch/size, mothr
efficiency. Not all is created equal. Also why is the voltage sagging?
If you turn off the motor, it does not happen? Thin simple.
If I were you, I'd start by diagnosing why the motor is running slow and
drawing too much current. Its highly unlikely that a motor as a component
of some appliance would have been designed to run in such a manner. The
only other possibility is that something has gone wrong.
A run cap has failed, centrifugal starting switch is stuck, excess voltage
drop in the contactor or supply ckt., frozen bearing, etc.
Find the problem and fix it. The motor may still be OK. If you just drive a
stuck fan with a bigger motor, eventually that bearing will really freeze
and burn the new motor up as well.
Paul Hovnanian email@example.com
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