Re: Is this motor synchronous?
Sent: Wednesday, December 31, 1997 12:56 PM
Subject: Re: Is this motor synchronous?
In a message dated 97-12-31 03:32:13 EST, you write:
> My 1725 RPM motor didn't have a cap, although I'm suspecting I might have
> been successful had I removed less material. How does one determine _by_
> _observation_ if a motor is a capacitor start/induction run type of motor
> vs an induction start/ induction run or capacitor start/capacitor run
> type, short of having a spec sheet?
> Thanks again for the help.
> Gary Lau
I ground my flats for the 1800 rpm motor 1 1/8" wide for a 2 7/8" dia
armature if I remember correctly (I posted this info in the past). I got
good results, so I suppose this ratio is OK. I have no idea if there is
a better ratio. My motor was a 1/4 HP washing machine motor with
no capacitor. IMO, a .65 amp motor is somewhat weak for use in
a sync-gap. A 1/25 HP motor is probably a practical minimum unless
the rotor is tiny.
Cap start motors have a centrifugul switch inside, as do induction
start motors. I think cap run motors tend to be small, less than
1/4 HP. This is a rough guide as I'm not an expert on these various
Hope this helps,