Re: 8-wire 1/2coil stepper?

At 04:27 08/05/2002 +0000, you wrote:

>--- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
>
> > Good evening! You can do that and you are absolutely correct; the
> > performance will be identical to a 6-wire motor wired in a half-
> > winding configuration.
> >
> > You can also try to connect the motor in parallel. The test to see
>if
> > you have it right is easy. Simply compare the motor's detent torque
> > after you have paired the windings to what the detent torque was
> > before you connected anything.
> >
> > If you have it right, the detent torque will be the same (easy to
> > turn). If you have it wrong, the motor will be difficult to turn.
> >
> > If it is easy to turn, connect the windings to the drive connector
> > and try running it.
>
>Hi Mariss,
>
>Thanks for the info. I'll probably start with that 3% sacrifice.
>Makes life easier. But being the greedy person I am, I'll also
>probably try to get that extra 3% later, so I'll try to digest the
>above.

Its not necessarily just 3% difference - it depends greatly on the motor
spec. For example, take a look at:

http://www.mae.it/us/2231.htm

This 8-wire motor (RH column of the table) is quoted as giving 30% more
holding torque when bipolar parallel connected vs. unipolar connected. They
uprate the current by a factor of 1.4 for bipolar parallel connection (or
downrate by 1/1.4 for series connection).


Regards,
Tony