On 01/21/2020 07:23 AM, Gene Heskett wrote:
As a first try, I'd put the 4mfd cap in series with the
black-red coil, but I'd also bring it up with a powerstat
in case I'm wrong. If it runs weak and hot, move the cap
to the other winding. Which ever runs cooler and with more
torque is correct.
Interesting! Many of these small motors set up for
permanent split capacitor are "symmetrical", ie both windings
have similar inductance and resistance. This allows the
simplest reversing scheme. You tie two wires together to
neutral. The capacitor goes between the two ends of the
windings. A SPDT switch connects line to either end of the cap.
But, this motor clearly is NOT symmetrical! The black-red
winding has huge inductance -- HALF a Henry!
That is a reactance of 188 Ohms at 60 Hz, so the current at
120 V would never exceed half an amp.
The Blue-Yellow is TWICE that. These inductances seem way
too big. But, maybe that is for inductance
protection of the motor at stall. Possibly, this is a
torque motor, intended to hold torque on a tape reel
or something like that, and not run at constant speed.
Jon
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