Re: [CAD_CAM_EDM_DRO] DC motor as replacement for Stepper motor

You might start by looking at the site www.geckodrive.com

This basic module costs about $100. If you only need a fairly
small torque capability, a stepper motor probably would be
cheaper, but at larger sizes the DC motor is cheaper.

For really small things you may be able to salvage a stepper motor out
of an old floppy disk drive. There are sometimes bigger ones in
printers - the older and heavier the printer is, the better change of
finding a big motor inside - but alas some of these printers will
use things other than stepper motors (brushless ac servos, etc).

What tourque and speed do you need?

Chris Stratton

> but how? can you help me with this actually we're running out of funds for
> our thesis and the cost of stepper motor here in the philippines is quite
> expensive. so when we got an idea that dc motor can be interfaced in such a
> way like the stepper we agreed to use is but we don't have any idea on how
> to do it. please help!!!
>
> ramel
>
> -----Original Message-----
> From: ccs@... [mailto:ccs@...]
> Sent: Wednesday, January 23, 2002 12:39 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] DC motor as replacement for Stepper motor
>
>
>
> > hi to all! just want to ask if it is possible that we can use DC and
> > create a ckt board for it so it can act as stepper motor? if possible
> > where can i find resources on this.
> >
>
> Ramel,
>
> Yes, an appropriately chosen DC motor equipped with a rotary encoder
> for position feedback can be used as a servo motor. And there are
> servo drives (such as the G320/G340 from Geckodrive, whose designer is
> on the list here) which take the same step & direction inputs as
> stepper motors. Done right, this can results in much higher
> performance for much lower cost than that of the large stepper
> motors needed for substantial machine tools.
>
> Chris Stratton
>
>
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-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html