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Old 17th Oct 2020, 6:28 pm   #17
cmjones01
Nonode
 
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,141
Default Re: Wiring a 110V two-phase motor?

Since it's "Klaxon" branded and rotates at 100rpm, I wonder if it was intended to operate the shutters on a pulsed 'nee-naw' type siren? If so, it may have been powered from two of the three phases feeding the blower motor, maybe via a transformer or even taps on the blower's windings. For such a light duty, the extra cost of a winding for the third phase probably wasn't justified.

I think a 180 degree phase difference is unlikely. It's pretty hard to get anything to rotate with two phases 180 degrees apart (do the trig). You need a quadrature component. The standard 120 degrees is fine.

You might be able to get the motor to run using a step down transformer (even less than 110V should be OK for testing) and connecting one winding straight to the supply and the other via a capacitor or inductor to create some phase shift.

Chris
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