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Sync Motors
From: FutureT-at-aol-dot-com[SMTP:FutureT-at-aol-dot-com]
Sent: Tuesday, September 23, 1997 6:44 AM
To: tesla-at-pupman-dot-com
Subject: Re: Sync Motors
In a message dated 97-09-22 22:22:05 EDT, you write:
<<
> Question: Can squirrel-cage type motors be modified to become
> synchronous? I have two 40W motors which use a cap winding for
> generating the extra phase (no switching) and the armature has
> conductors embeded in laminated iron.
> Thanks,
> Malcolm
>>
Malcolm,
In general, yes, but I've never tried
using the types that keep the cap in place all the time. It would
seem that the extra phase would want to see its own flats, such
that a 3600 rpm motor would want to see four flats instead of
the usual 2 flats? And an 1800 rpm motor may want to see
8 flats instead of the usual 4? I think the modification would
work, since these are induction motors...the question is how
many flats would be needed. I too have wondered about this,
I hope someone knows the answer. Also, these 40 watts motors
may be kind of weak for a sync-gap?
I have modified standard squirrel cage induction motors without
the run caps, and they work excellently in sync mode. You may
have seen my recent posts on the subject. The smallest motor
I have used is 1/10 HP, and this locks up a 6" disc with narrow
edge electrodes (3600 rpm). Kevin E. uses 1/20 HP motors. I
don't know if Kevin's motors use the run cap. Maybe he'll have
some comments. Washing machine and clothes dryer motors
are good and can be torn out of junked units. These are usually
1/4 or 1/3 HP.
Hope this helps,
John Freau