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Which winding is which on a 1/3HP single phase motor?

Andy Millar

Hi,

Showing my ignorance while trying to help a friend wire up the motor on his Myford lathe.

As far as I can tell the motor is single phase with an auxiliary winding, I believe it's no capacitor but centrifugal switch. One winding measures around 15 ohms, the other 6 ohms. Anyone know, or educated guesses, as to which winding is which? I've seen contradictory advice online.

It doesn't particularly matter, but might help while I'm gently testing it (for a start to check it does have a centrifugal switch) before applying full throttle.

I was probably taught all about this, but that was 40 years ago. I do know a lot more now than I did this time yesterday!

Thanks,

Andy

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    True it only needs one winding to keep running once spinning- though you can start it the wrong way as well - in the days before health and safety being quite so prevalent I have started a few motors with sticky starter switches or failed starter caps when they were stalled and buzzing, by "pulling on the belt" but it is just as easy to get it spinning backwards which may not be desirable.

    Mike. 

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    True it only needs one winding to keep running once spinning- though you can start it the wrong way as well - in the days before health and safety being quite so prevalent I have started a few motors with sticky starter switches or failed starter caps when they were stalled and buzzing, by "pulling on the belt" but it is just as easy to get it spinning backwards which may not be desirable.

    Mike. 

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