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Re: mod of sync motor (trying to modify)
In a message dated 3/28/00 3:39:01 AM Pacific Standard Time, tesla-at-pupman-dot-com
writes:
> at's just a little below a 50-50 ratio,
> just like you suggested :) The motor ran *much* more smoothly.
> I attached a fan to the shaft and put it under a floressent lamp.
> I could see a "cross" pattern in the spinning blades, so I "think"
> I've succeded here.
Yes, if the cross pattern does not rotate under fluorescent light,
then it is good, as you lower the voltage with a variac, you'll hear
the motor fall out of lock and begine hunting sounds as you raise
teh variac gradually, then when it locks fully is will be very steady and
smooth.
>
> Feeling lucky, I moved on to the 1/3 HP, 3450RPM motor. Still working
> under the dead pole method, I cut .750" flats on it's 2" rotor.
> (BTW, what porportion of cut to uncut do you use on a 3450RPM motor?)
> I had a starting cap that came with this motor, and when I powered it
> up, it spun right up and ran very smoothly. I didn't have anything to
> put on the shaft to help in telling if we're locked or not. I'll be
> making the strobe described in Terry's STROBE.ZIP file to help verify
> sync.
I'm not as sure about the best amount of cut for a 3600 rpm motor, because
i"ve only modified one of those. My rotor was 1 7/8" diameter. I made the
cut 1 1/16" wide, but I think maybe a little narrower would have been good
too. In any case, the motor was very powerful when done.
Cheers,
John Freau
>
> Well, more experimenting during lunch tomorrow :)
> Paul