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Motor-run capacitors... bookmark this?

E

Eric the Viking

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In case someone has an oddly-behaving induction motor*, this might be helpful.

Basically, look at the existing cap, note its physical dimensions and its capacitance value, usually measured in uF (microfarads), and see if there's a matching one. It's not a panacea but a failing cap will give poor starting and poor or no running, probably with a bit of audible buzzing as the motor effectively stalls instead of running up.

https://www.switchelectronics.co.uk/collections/motor-run-capacitors

I have no vested interest, however I do buy electronic parts from Switch Electronics, and I didn't realise they did motor-run caps. They're not expensive, and it's convenient having them all in one place.

E.
*motor run capacitors are not relevant to motors with brushes.
 
Nice to have an alternative to the Amazon/ebay lottery. Those all appear to be run rated, as opposed to starting type ones which generally have a higher capacitance but must be switched out when the motor is up to speed. There shouldn’t be any harm in using a run one in place of a start type.
 
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