RE: [CAD_CAM_EDM_DRO] Steppers

It would probably be interesting and pretty chaoitic. The drive does not
care much other than the total current that goes out the loop. The coils
from the two motors would interact with current and voltage. The results
would likely be unpredictable unless the motors were hard coupled. If the
motors were hard coupled and well timed, it would be just like driving twice
as large a motor which was wired in parallel. That would work fine as long
as the timing was exact. Without coupling, all heck would break loose.

I did a similar thing one time with two dc motors and an open loop voltage
drive. The resulting situation was a differencial drive, similar to a
mechanical differencial on a car. With the drive set to zero volts, one
motor turned forward would turn the other motor backward. With the drive
set at a few volts, both motors would go forward at the same speed until you
braked one motor, then the other motor would double speed.

GTJ

-----Original Message-----
From: Tim Goldstein [mailto:timg@...]
Sent: Tuesday, November 26, 2002 12:41 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Steppers

Driving 2 steppers from one Gecko drive is not a good idea. Gecko drives
monitor feedback from the motors to actively stabilize them. With 2 motors
connected the results are unpredictable. It would work better to use a
single step & direction source to drive 2 Gecko drives with one motor
attached to each.

Tim
[Denver, CO]
Sherline products at Deep Discount
and Mach1 CNC Controller
www.KTMarketing.com/Sherline

----- Original Message -----
> If you drive two motors from the same Gecko drive do you need to
> increase the amps or make any other changes?
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
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