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Unread 10-07-2004, 03:45 PM   #13
greenman100
Cooling Savant
 
Join Date: Jun 2004
Location: Florida
Posts: 414
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Quote:
Originally Posted by ferdb
Fans use shaded pole motors, they don't run at exactly the line frequency but have a certain amount of slip. The shaded pole design is a tradeoff of efficiency for easy startup and higher starting/ low rpm torque. There is no problem running AC fan motors undervoltage, it's done all the time. Ever seen a ceiling fan speed control? Using a transformer does the same thing, just gets rid of the buzz.

Good call on this. I have been thinking of other motors, like those used in pumps.
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