RE: [CAD_CAM_EDM_DRO] Re: stepper current

Wouldn't dissipation be increased by a factor of four rather than a factor
of two? If I remember correctly, power varies as the square of the current
rather than as the current (P = V*I; V=IR; so P = I^2 * R)

-- Carol & Jerry Jankura
Strongsville, Ohio
So many toys, so little time



-----Original Message-----
From: JanRwl@... [mailto:JanRwl@...]
Sent: Friday, April 27, 2001 11:08 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Re: stepper current


In a message dated 27-Apr-01 07:57:07 Central Daylight Time,
rsidor@... writes:

> > Question do I set the current for .5 amps now due to
> > > twice as many ampere turns?
>

Upon second thought, I think you are actually right that you should reduce
the current, as unipolar "center-tapped" motors are designed/wound with the
expectation that only half the winding will be conducting at any given time.
Thus, the dissipation would be DOUBLE if you fed "rated current" (1.0 amp)
through both sides, all the time. I never dealt with this consideration,
therefore I stumbled. Duh...


[Non-text portions of this message have been removed]


Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.

Addresses:
Post message: CAD_CAM_EDM_DRO@yahoogroups.com
Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
Moderator: jmelson@... timg@... [Moderator]
URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
bill,
List Manager

FAQ: http://www.ktmarketing.com/faq.html

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/