Re: [CAD_CAM_EDM_DRO] Re: PWM vs Constant current

First, I assume you're talking about a stepper based system.

If so, I'm quite curious as to the reasoning of the person who suggested a
constant current system.

While there are a few theoretical disadvantages to a chopper system over a CC
for managing the current into a stepper, those disadvantages are, in my
experience, largely academic.

CC systems, however, have genuine real world disadvantages, in the form of
much bigger and much more expensive power supply requirements and WAY more
heat generated.

So I'm curious.

Note that outside of being more expensive and generating lots of heat, there's
nothing wrong with a CC system, but since there is a cheaper, more efficient
solution to the problem ...


Alan

On Monday 24 October 2005 06:54, Jarrett & Heidi Johnson wrote:
> Hello, I've been told that I should be looking for a constant current
> system [verses a PWM one] and I'm wondering if some of you electronics
> fellows could offer comment. First of all in what the differences mean [ I
> think I know, but would like that confirmed] and if this gentleman is
> correct or not in regards to which route to go. I'm by no means well
> trained in electronics and theory of that nature so go easy on me please..
> however I'm trying to learn and understand what I can.

--
Alan Rothenbush
Academic Computing Services
Simon Fraser University
Burnaby, B.C., Canada


Before me things create were none, save things
Eternal, and eternal I endure.
All hope abandon ye who enter here.