Re: [CAD_CAM_EDM_DRO] torque vs amps was:Re: Special deal on 8 amp API stepper drives

My guess is that the controllers have their mid-range stabilization
optimized for a motor no larger than 350 oz-in. I'm going to run one on the
bench with one of my NEMA 42 motors to see how it performs under different
conditions.

Regards,

Paul R. Hvidston, N6MGN
ACKSYS Engineering
Upland, CA

----- Original Message -----
From: "timgoldstein" <timg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, March 18, 2002 8:12 PM
Subject: [CAD_CAM_EDM_DRO] torque vs amps was:Re: Special deal on 8 amp API
stepper drives


> Does seem odd that they would list a torque spec for the drive as you
> can put on some nice rare earth magnet motors and get much higher
> torque at the same electrical specs in comparison to ceramic magnet
> motors. As best as I can tell the "Brochure" is actually an older
> specification. If you notice it also says that the drives are only 5
> amp. If you look at the "Installation Sheet" it has the current at 8
> amps max. The drives are marked on the drive as 8 Amps/Phase and the
> dip switchs allow you to select 8 amps.
>
> So as far as I can tell and from the settings I have tried the in/oz
> spec they list is meaningless and all my tests say it is capable of a
> full 8 amps which means with the proper motors you could get 3 times
> the listed in/oz spec.
>
> Tim
> [Denver, CO]
>
> --- In CAD_CAM_EDM_DRO@y..., "aspaguy" <spaguy@l...> wrote:
> > The pdf brochure on these drives shows up to 350 oz /in torque, but
> > shouldn't an 8 amp drive be able to handle much more than this?
> I've
> > seen 3-4 amp moters with over 350 oz/in ratings. Can the drive
> reduce
> > the available torque?
> > Thanks,
> >
> Dale