Re: [CAD_CAM_EDM_DRO] Bipolar stepper driver for unipolar steppers

> I have a part CNC kit for the Taig mill comprising stepper motors and mounts.
>
> The stepper motors are Shinano Kensi SST57D3100 6 wire motors rated for 6.7V,
>
> 1.0A . I think they were used in the older Taig CNC mills. The details on the
>
> Shinano website show these as being used in 6 wire configuration with a 24V
> constant current driver.
>
> I have got an Oatley electronics 4/6 wire constant current driver which shows
>
> 6 wire motors being driven as 4 wire with current passing through both sides
> of the coil and the center wire being disconnected ie

That is one method. However if the voltage rating applies from the
center tap of the winding to either end, then using the full coil (end
to end) will mean double that voltage rating, and slightly more than
half of the usual current. It is very hard for a drive to pump
current through the inducatance of a 13.4v rated coil at a fast
switching speed for high rpm operation. So you will probably get
better performance using just half of each coil (tape up the extra
leads) and setting the driver for the rated winding current.

Chris

-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html