Re: current limiting power supply for stepper?

Hi Dave-

The power supply I am thinking of using has adjustable voltage and
current limiting. When the specified current limit has been met the
voltage lowers (and maximum current remains constant).

(This is from National Semiconductor's datasheet on the LM317, p 14).

So for a given stepper I would adjust the max. current to the max
current rating for the motor, but use a higher voltage than the
nominal motor voltage rating. The current would not exceed the motor's
max.

I know this is not the way it is usually done, but I am wondering if
there is any reason not to try it.

Grant

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude
<davemucha@j...>" <davemucha@j...> wrote:

> Hi Grant,
>
> there is a maximum current you can pump into a motor. voltage is
> limited(chopped) to keep the power on the upper end of the curve.
> current monitoring is how it is done.
>
> for reasons why 25 times nameplate is the max as far as voltage goes,
> read the white paper at www.geckodrives.com
>
> Dave