Re: Diodes & Caps

Roger,

Most power supplies for steppers are unregulated and only consist of a
transformer, bridge rectifier and a capacitor. The resistor is there to
drain off the current after the power is shut off.

Bob Campbell

----- Original Message -----
From: Roger Brower <rbrower@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Friday, July 09, 1999 12:33 AM
Subject: [CAD_CAM_EDM_DRO] Diodes & Caps


> From: Roger Brower <rbrower@...>
>
> My thanks to Mo for the discussion of pull up (and pull down) resistors
> which has helped me in my troubleshooting. I'd like to ask (this would
> be a FAQ, I'm sure) about the Diodes and Caps suggested in the stepper
> motor coil wiring. Values, placement, theory? I thought these windings
> had a bi-directional current flow, by their basic nature. The Crafter
> controller I have has a bleed resistor across the supply capacitors, but
> no diodes, as far as I can tell. When I run 5 Amps through my Camtronics
> driver, this will become a critical issue, I'm sure.
>
> Also note: I've seen http://eio.com/public/stepper/ before, but somehow
> I just found http://www.eio.com/stepindx.htm
> See also: http://www.euclidres.com/apps/stepper_motor/stepper.html
>
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