Re: [PSUBS-MAILIST] Single Phase to Three Phase Converters (Welding)

[Jim Rudholm <jimrudholm@gmail.com>]

Steve,
I have used the homebuilt rotary converters in my machine shop for
several years. I used a 3hp motor for my 12" Clausing lathe and 15"
LeBlond with 1.5hp motors. The 3hp is wired with a run capacitor, 10
mfd/hp, and a start cap., 100mfd/hp, in parallel on the third leg. The
start cap must have a momentary push button switch in series. Its
function is to "kick" start the 3hp motor (rotary converter). It
cannot stay connected in the circuit or it will fail, usually blow up.
The run cap. stays in the circuit. For starting, I hold down the start
cap. push button, hit the input switch ( a 3 hp motor controller/
circuit breaker), then release the push button, all less than two
seconds. There are relay/timer circuits that do this automatically, I
prefer the simple push button. The rotary converter spins up in less
than 3 seconds and then the lathes are ready to run.
For my Shizuoka mill (4hp) and Standard Modern 26" lathe (3hp with
brake, 300# 4-jaw  chuck) I have a 7hp rotary converter.
I have read that the rotary converter is best for electronic loads
like welders.
There are several posts in the Practical Machinist forum:

http://www.practicalmachinist.com/vb/transformers-phase-converters-vfd/rotary-phase-converter-designs-plans-101231/

Jim

On Wed, Nov 23, 2011 at 6:40 PM, Steve McQueen <psub101@indy.rr.com> wrote:
> Anyone have any experience with converters that will take the normal single
> phase residential feeds and convert to three phase?  This would be for those
> of us looking to run 3 phase welders at home.
>
>
>
> Some background:
>
> http://www.3phasepower.org/
>
>
>
> Steve



************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************