8 wire half or Serial ? ( was Speed - Parallel vs serial ( was Re: Motor

Hi Peter and all,

It seems that half coil offers a simple solution and would let me run
straight away.

Now my ignorance will become abundantly clear.

using 2 coils, like a 6 wire stepper, center connected, one end un-
used, would use nameplate amps.

getting the correct pairs and matching them and wiring up each pair
as if it were one coil (again like an center connected 6 wire
(parallel)but now using the 'other' end wire/circuit) would use
nameplate amps.

finding the correct 2 pairs and series wiring would use half
nameplate, and run half as fast. Like an end connected 6 wire.

Miswiring which pairs (not shorting out wires or other mistakes)
would only make the motor miss.

The idea of powering two sets of coils in series with half current
has't integrated itself in my thinking as yet. Seems two series
lightbulbs at full voltage would burn half as bright, but if the
voltage were halved they would be really dim. My thinking is that
I 'want' to double the power at series. I am intelegent enough to
follow the directions and use half current.

Dave

--- In CAD_CAM_EDM_DRO@y..., "cadcamcenter" <cadcamcenter@y...> wrote:
> > 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.
> >