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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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    Hi Andy,

    Similarly for me it is about 40 years since I looked at single phase motors but dredging my memory there should be a main winding and a secondary winding with a different inductance/capacitance to create the rotating field to get the motor rotating. I suspect the main winding is the lower impedance (I am guessing you have just measured the dc resistance of the windings but I would still expect it to be the lower reading) and the higher impedance will be the auxiliary winding. 

    Please remember this is in the educated guess category rather than the knowledge category. Best of luck with the testing.

    Alasdair

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  • 0

    Hi Andy,

    Similarly for me it is about 40 years since I looked at single phase motors but dredging my memory there should be a main winding and a secondary winding with a different inductance/capacitance to create the rotating field to get the motor rotating. I suspect the main winding is the lower impedance (I am guessing you have just measured the dc resistance of the windings but I would still expect it to be the lower reading) and the higher impedance will be the auxiliary winding. 

    Please remember this is in the educated guess category rather than the knowledge category. Best of luck with the testing.

    Alasdair

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