RE: Sync motor(s)

["Colin Dancer" <CMD-at-datcon.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Michael,

For 3600rpm you only need two flats (four flats are for 1500/1800 motors)
and 1.5cm sounds a perfectly reasonable flat size.  Most people now ignore
the advice about counting dead poles and instead just go by why works right.
I've converted both a 1/4HP and a 1/2HP motor and only needed 20mm and 16mm
respectively.  (A picture of the smaller rotor can be found on my site at
http://www.pyrochrome-dot-net/tesla.)  The more even and parallel the flats, the
better balanced the rotor and the less vibration, but it's perfectly
possible to do a workable job using an angle grinder or even a file (if
you've got the patience ;-).  With care I don't see why you shouldn't be
able to use a bench grinder.

Hope this helps,

Colin.

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: 01 September 2000 00:43
To: tesla-at-pupman-dot-com
Subject: Sync motor(s)


Original poster: "acmnovak" <acmnovak-at-msn-dot-com> 

Hello All,
I'm thinking of converting a small motor of mine to synchronous. However,
when
I looked inside to determine the size of the flat, I found it to be *really*
tiny. Look at the diagram at 
<http://members.xoom-dot-com/mpn54601/motors_2.gif>http://members.xoom-dot-com/mpn5
4601/motors_2.gif
There is only one dead pole per side... This is kind of strange because the
flats required would only be about 1.5cms across! That's tiny. The motor I
would like to use is only 1/15 hp, but that should be good enough.
Another motor I was planning to covert to sync is 1/4hp at 3450 rpm. Some
quick
questions about this:
Do the flats have to be perfect? You can do this with a simple angle grinder
right? How could you remove enough material? 
I'll be making 4 flats for 3600rpm sync right?
Would a bench grinder work to mill the flats?
 
Any help would be much appreciated,
Thanks
-Michael