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Sync Motors




From: 	Peter Electric[SMTP:elekessy-at-macquarie.matra-dot-com.au]
Reply To: 	elekessy-at-macquarie.matra-dot-com.au
Sent: 	Thursday, September 25, 1997 6:11 AM
To: 	Tesla List
Subject: 	Re: Sync Motors

Tesla List wrote:

> From:   Kevin Radtke[SMTP:umradtke-at-cc.UManitoba.CA]
> Sent:   Wednesday, September 24, 1997 9:51 AM
> To:     Tesla List
> Subject:        Re: Sync Motors
>
> Hello,
>         Is it possible to explain over e-mail how one could modify an
> AC
> motor to make it run sync.  I'm still a little confused about the
> flats
> on the armature etc.  Do you need special machining equip.?  What type
> of
> motor is easiest to modify?  Any help greatly appreciated thanks.
>
> Radtke
>
> p.s.  The other day my friend and I decided to wrap a basketball with
> foil and see how it would affect our coils output if we used it as a
> secondary terminal.  We were getting 14-15" discharges from the bolt
> terminal, but the sphere reduced that to about 2"  :(  We of course
> played around with re-tuning the coil but not much improvement was
> realized.
> Do you need to adjust the main cap. size when adding load to the
> secondary with spheres and torroids?

 I modified a 1450 RPM motor (we have 50 HZ mains here) by filing four
flats on the armature with a large file. I ground most of the metal off
with a belt sander then finished it off with the file, but you could do
the whole lot with the file and it still wouldn't take longer than 2
hours IMO. Just make the flats less than 1/8th the circumference of the
armature
and use a smallish motor and balance won't be a problem. I got my motor
out of an old IBM selectric typewriter.You'll be amazed at how easy it
is.

Cheers,

Peter E.