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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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    From the distant past .......... since it is centrifugal start, it's probably designed as a "split phase motor" with the centrifugal switch in circuit only to start the motor winding. This switch will be opened or "thrown out", when the motor is at run speed, then the motor continues running. Again if memory serves right. if the run winding is connected to the mains and the shaft twisted, the motor will run up to speed and continue to run correctly.

    Jaymack    

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  • 0

    From the distant past .......... since it is centrifugal start, it's probably designed as a "split phase motor" with the centrifugal switch in circuit only to start the motor winding. This switch will be opened or "thrown out", when the motor is at run speed, then the motor continues running. Again if memory serves right. if the run winding is connected to the mains and the shaft twisted, the motor will run up to speed and continue to run correctly.

    Jaymack    

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