Re: Stepper Drivers

> From: "Harrison, Doug" <dharrison@...>
>
>
> > Sometimes it gets tempting to just buy IRF640's rated for 200 volts
> > and simply rectify the line...
> >
> > Chris
> >
> Depending on what kind of isolation your amps have, this might work
> fine. I read of one manufacturer that does this.
>

With optocouplers on the inputs and the box closed up it should work.
But dangerous to work on - need a floating scope or an isolation
transformer on the amp (a safer bet in general but back to the $$).
Also the wires to the motors are then more dangerous - fine use
4-conductor line cord. But how about the insulation in the motors
themselves - what is that good for? I suppose I could ground the
lathe and design in a fuse that would blow if one of the windings
shorted to the frame.

It would be the way to squeeze every last inch per minute out of the
steppers though!

Chris

--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
30 Griswold Street, Cambridge, MA 02138
http://www.mdc.net/~stratton
(617) 492-3358 home/shop