Re: Unipolar as bipolar.

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


--- In CAD_CAM_EDM_DRO@egroups.com, Alan Marconett KM6VV <KM6VV@a...>
wrote:

> Hi JJ,
>
> You might have that reversed. Most unipolar steppers have the

windings

> tied together, making them unusable in bipolar mode. 6-wire

steppers

> can usually be used as 4-wire bipolar steppers, although the

inductance

> is higher, and the torque curve is not as good on the "serial
> connection" as in the "parallel connection".
>
> Alan