CAD CAM EDM DRO - Yahoo Group Archive

Re: Treadmill Motors as Servos - DC Motor Controller –

Posted by John Hansford
on 2006-11-12 17:30:51 UTC
Hi Bill,

I truly understand how confusing it can be.

I (my opinion) believe you made the right decision with
the Proxxon. I'm seriously thinking about this...

http://littlemachineshop.com/products/product_view.php?ProductID=2892

It's for doing actual work so I won't waste time trying to rig up
something better...I probably can't.

As far as the treadmill repair.. Those controllers are all
propietary..all matched to their motors, timing, gearing, etc. You
have speed sensing,
loading sensing, all kinds of little details that only the maker
knows. You could get lucky with that particular controller or
it could be an expensive exercise in frustration.

I'm pretty sure the item# 11-2269 controller is all you need to
control A treadmill motor. Look at the wiring diagram on the page,
You'll see what I mean. I did a google search on that model and it's
well thought of...it's all over ebay for $100.00.

I think DC Motor when I want a variable speed with a desired
power(HP). I like to stay about 1/3 to 3/4 HP for my homemade
projects, mainly because there's a good chance I could remove my
hand intact should something go wrong(and it has).

Controlling a DC motor is pretty easy the old way, a transformer,
a rectifier(ac to dc), and some simple radio shack electronic circuit
to make the speed variable. Look up "pulse width modulator schematic"
and you'll find all kinds of easy to follow circuits easily and
cheaply built. I think this is the best way to learn.

Who knows what they do in a modern prebuilt controller now-adays.
That's Deep electronics for the average guy(like me).
Selecting premade controllers can be a nightmare without
having a specific application in mind.

You can write me anytime and I'll help you any way I can, at least
maybe steer you in a good direction.

Basically with DC motors, you know what you want it to do First.

Hope thats helpful,
John

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "William Perun Sr"
<wperun1@...> wrote:
>
>
> John (kz1927), Leslie, John Hansford, and Jesse Brennan – thanks for
> your inputs. Your question – "what are you going to use the motor
> for" is very important. I intend to use it for learning about dc
> motors. I've been studying / searching dc motors for over a year by
> reading web posts on various Yahoo Groups. But I am so far behind
> most of the posts that I don't understand what they are talking
> about, or I can't seem to make the connection between what I
> understand and a practical working application.
>
> Let me get specific. I studied / searched dc motors and their
> controllers for a high speed engraving spindle application (greater
> than 15,000 rpm, and 100 watts minimum) for my SIEG X2 CNC mill.
> Impossible – the technology of brushless dc motors and their
> controllers are way too complicated. So I backed off to brushed dc
> motors and their controllers. Not that simple either. So I settled
> for the KDNTool solution – the Proxxon IB/E Professional Grinder. I
> want to engrave and sculpt plastic, brass, steel, and wood.
>
> But I still don't know anything practical about building a dc motor
> and controller system. I can't even match a commercial dc motor
> with a controller, for a specific application. So I decided to do
> something simple and practical to enable learning. Fix my broken
> treadmill. I feel that if I can do that then I can move on to
> something more challenging in CNC.
>
> Thanks for the Surplus Center information for their item# 10-1783.
> Argord Corp permanent magnet motor, 1.2 amps at 95 VDC unloaded.
> John Hansford – is the Surplus Center item# 11-2269 controller,
> 90/180 VDC speed controller w/pot compatible with the motor? Does
> the controller plug into 120 VAC, or do I need to purchase something
> to go between the 120 VAC supply and the controller?
>
> Here are some of the things I've learned / found about dc motors,
> servos which may be useful to you guys. Jesse Brennan, I'll look
> into the Bodine motor web site.
>
> Electric Motors by Brian Molder, this is a five part series – click
> on Articles from Southeasters, then select each of the five Electric
> Motors articles.
> http://www.southernsoaringclub.org.za/
>
> Intro to PID
> http://www.thekeeser.com/Electronics%20info/intro_to_pid.htm
>
> A technical guide to building fighting robots – click on DC motors
> http://homepages.which.net/~paul.hills/index.html
>
> The Gizmologist's Lair
> http://www.gizmology.net/motors.htm
>
> Beginners' Guide - Electric Motors
> http://adamone.rchomepage.com/guide5.htm
>
> Thanks for your help, and God bless you all.
>
> Bill Perun
>

Discussion Thread

William Perun Sr 2006-11-12 13:16:25 UTC Treadmill Motors as Servos - DC Motor Controller – turbulatordude 2006-11-12 13:39:35 UTC Re: Treadmill Motors as Servos - DC Motor Controller – John Hansford 2006-11-12 17:30:51 UTC Re: Treadmill Motors as Servos - DC Motor Controller – turbulatordude 2006-11-12 19:48:05 UTC Re: Treadmill Motors as Servos - DC Motor Controller –