Re: determining stepper motor current

Hi Rich
Thanks for your help - will try upping the peak current.
Although the label says 1.2ohm, each coil actually measures 3.2ohm
so I think this will give about 2watts? But my meter shows that I'm
sending 0.2A (is this the average current through coils??) at 32v.

so 0.2A x 3.2ohm =.64v and 0.13watt I think its a question of
using either peak current or average current in the equation.

I wish I had measured vref on the old board before removing all
components from it and as the board contained a multitude of
components for changing vref through software I can'nt even
reconstruct the schematic easily!!

Thanks again
Alan

--- In CAD_CAM_EDM_DRO@yahoogroups.com, RichD <cmsteam@s...> wrote:
> Alan,
> I'm not familiar enough with typical 17 motors, but .8A x 1.2 ohm
> gives about 1 volt and that's barely .75 watt.
> My guess is .8 amp would be fine or push up to 1 amp watching any
> bad heating. The only problem would be saturating the iron at some
> point. If they do what you want there, stick with it.
> RichD
>