RE: [CAD_CAM_EDM_DRO] stepper motor connection problem

If the motor oscilates back and forth then it means that one phase is
wired backwards relative to the other. Simply swap the wires connected
to termial A and B of J5.
Dan

-----Original Message-----
From: Elliot Burke [mailto:elliot@...]
Sent: Friday, March 14, 2003 11:31 PM
To: CAD_CAM_EDM_DRO
Subject: [CAD_CAM_EDM_DRO] stepper motor connection problem


In trying to get a 20 year old stepper motor stage going I've managed to
create a puzzle, perhaps someone can help me. What I have is a
Camtronics 5A controller. It is known good, it works well with 4 wire
stepper motors. Also have a 6 wire stepper motor, 200 steps, 12 V/0.44A,
45 oz-in, made by Eastern Air Devices, 1984. So I measure the coil
resistance with a DVM, and find that there are two center tapped coils,
22 ohm resistance to the centertap. I pick 4 connections on the motor, 2
pair which have 22 ohm resistance. The two pair have megohms of
resistance between them. Connect one (of four) wire from the controller
to a centertap on the motor. Now there are 6 ways the remaining 3 wires
can be connected to 3 connections on the motor. I try them all. No go,
the motor just jitters clockwise and counterclockwise.

What gives?

I know the motor is good because it works with its own antique
controller. There is apparently no available documention on the
controller, no way to computer control it, so the plan is to use Mach1
on it with the Camtronics board.

Much thanks to all for help, and for the many great ideas and
discussions on this list.

Elliot B.
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