Re: [CAD_CAM_EDM_DRO] Re: 8-wire 1/2coil stepper?

Bipolar 1/2 coil vs bipolar parallel or bipolar series is not the same as
unipolar rating. You are correct that there is about a 30% greater torque
when using a biploar driver vs a unipolar driver. But, there is only a few %
difference between the various bipolar connections.

Tim
[Denver, CO]

-----Original Message-----

>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