On Sat, 16 Oct 2004, Lee McLaren wrote:

> Hi All,
>
> I am looking for a way to drive a high power stepper motor, my current
> understanding (open to correction!) is that to achieve a high step rate with
> good torque you need to drive say a 8A 3V stepper with 80v which of course
> current limits to the appropiate value once the emf builds up. From my
> research some of the commercial units use even higher voltages up to 180v to
> maintain torque at high step rates.

You *must* obatin data sheet data about the motor insulation being able to 
withstand 160V at least (preferraby 320V) before you can use it with 
voltage forcing.

Look into chopper drives.

Peter
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