Re: Unipolar as bipolar.

Thanks Mariss,

I wasn't aware that only using 1/2 the winding would be that close to a
parallel connection. The old Slo-Syn tables I have don't look that
good. More like 20%, as I recall. Still, you waste 1/2 the windings!

Alan

Mariss Freimanis wrote:

>
> Alan,
>
> Any 6-wire motor can be driven in a bi-polar mode. Bi-polar refers
> more to the drive type than the motor.
>
> Full winding (center tap unused), is exactly equivalent to a series
> connected motor. 4 times the inductance, use 1/2 rated current, get
> 1/2 the power of a parallel connected motor for a given supply
> voltage, same holding / low speed torque.
>
> Half winding (end wire and center tap used, other end wire unused),
> is virtually identical to a parallel connected motor (within 3%). Use
> rated current, get rated holding / low speed torque.
>
> If interested in more detail, please see message #8239 (June 18).
>
> Mariss
>