Presumably an induction motor rather than a series wound brush type motor?
A single phase induction motor needs help to get started - without help it will just buzz, though it can be started in either direction by manually giving the shaft a vigorous twist...
The starting help is provided by an extra winding (start winding) that provides a phase shift to give the rotor a "kick" in the right direction and then is taken out of circuit. In the early days this was accomplished manually by a switch but later motors incorporated a centrifugal switch on the rotor shaft usually in series with a capacitor.
Lots of modern motors just have the capacitor in series with the start winding resulting in a lighter, cheaper and more compact unit though the capacitor is more highly stressed and fails much more often.
SOURCE: GE Dryer DWSR473GV0WW periodically just hums when turning on switch
if it hums when you start it means switch is ok. problem may be the motor capacitor. to check, take off the top and give the drum a push in the normal direction of rotation. if it goes then motor capacitor is faulty - cheap part
SOURCE: GE Dryer DWSR473GV0WW periodically just hums when turning on switch
might have a dead spot on the armuture or lint in the motor and or the centrifcal switch try taking it apart and cleaning the motor if that doesnt work replace the motor
SOURCE: maytag dish washer makes loud humming sound, I
Itcould be something caught in the impeller or filter area
3 THINGS QUICK.. RUN CAPACITOR THIS IS LOCATED ON TOP OF MOTOR HAVE IT CHECKED. OR START SWITCH DIRTY OR STAR CAPACITOR BAD.. SEARCH YOUR AREA FOR YOUR LOCAL POOL PUMP MOTOR REPAIR GUY WITH FREE TESTING.. WARNING THESE CAPACITORS HOLD HIGH VOLTAGE AND WILL NEED TO BE SHORTED ! USE A DRY RAG AND COVER CAPACITOR THEN SHORT WITH SCREWDRIVER
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