RE: [CAD_CAM_EDM_DRO] Bridgeport Series I 8-wire stepper (Sigma) current rating

> From: elson [mailto:elson]On Behalf Of Jon Elson
> Sent: Thursday, September 05, 2002 12:36 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Bridgeport Series I 8-wire stepper
> (Sigma) current rating
>
> Chuck Hackett wrote:
>
> > Thanks for re-posting Mariss's message.
> >
> > I think I'll try half winding. As I understand it this
> should give me good
> > rapids, almost as fast as parallel but without the current
> demands of
> > parallel.
>
> No, the power demand is actually LESS!. The current demand
> is the same. So, for a motor
> rated for 1 Amp in unipolar or half-winding connection, you
> would use 1/2 Amp
> PER WINDING in parallel, or the same 1 A per phase. The
> current splits, with
> roughly 1/2 Amp going through each winding.

Got it now ...

> > Can anyone tell me what the "name plate rating" of the
> Bridgeport Series I
> > 8-wire stepper (Sigma) motors are?
>
> I seem to remember 8.7 A per phase, but I could be wrong.
> That may be for the
> Superior Electric motors.
> ....
>
> Jon

The 8.7 jives with another source I had also.

Cheers,

Chuck Hackett
Omaha, Nebraska, USA
7.5" gauge UP Northern 844