Speed - Parallel vs serial ( was Re: Motor

> I did that first. an 8 wire stepper uses 2 sets (pairs) of coils,

it

> does not go into how to decide which two pairs to connect.
>
> Dave

This question occurs quite frequently. Let's see how one can
approach. The combined wisdom of this list says best is to wire in
half-coil.

8 wires stepper are 4 coils terminated at both end with separate
wires, forming 4 pairs of wires. With a multimeter, it will be easy
to find these 4 pairs. Let's call them A, A' and B, B'.

Wiring in half coil mean that 2 of these 4 pairs will be connected to
the driver, leaving the other two open. This mean there are only 4
possibilities and they are:

A and A' no good
B and B' no good.
A and B good
B and A' good

The question is, what happen when you connect A and A' and B and B'?
I guess the motor will not turn, but no harm will be done to the
driver/motor provided voltage, current setting are within permissible
limits. (hope the experts will elaborate on this)

When wired in the other 2 (good) possibilities, the motor will turn,
only thing is, if polarity is wrong, motor will turn opposite to
intended sense. A simple remedy will be to reverse the pair
connection or reconfigure the controller.

In any case, I believe the way to approach this is

1. determine the paired wires with multimeter
2. pick any 2 pairs, connect them to the driver.
3. Test. If wrong pair motor will not turn, probably make noise, but
no harm done. (experts please correct if wrong)
4. Make a note, pick another 2 pairs.
5. At most, you need only 3 trials before you get the motor turning,
and at most 4 to get them turning correctly.

Hope I did not give inaccurate info. (disclaimers apply)

Peter

--- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...> wrote:
> <snip>
>
> >
> > For wiring 8 wire stepper motors, go to www.geckodrive.com and
look
> at their
> > white paper on stepper motors.
>