RE: [CAD_CAM_EDM_DRO] Re: Power Supply for 4-axis CNC stepper driver

Hi Dave,

> > full step, both coils are on so you need 100% of the motor nameplate
> current
> > to provide full torque.
>
>
> I thought that for full step, you needed 100% one each phase ? that
> would be 200% of nameplate.

I thought I said that; just not as well. 8-)

>
>
> the scope would show instantaneous responses, but the filter cap
> would alevate or attenuate most of that from reaching the transformer.
>
> even without a scope, I would expect to see some noticable changes
> with a DVM if the power supply was only 10% of the proper rating.
>
>

Yes, I used my DVM to notice that the 24VDC supply dropped to 18VDC.
Didn't bother with the scope. The last stepper driver I designed used PAL
logic along with the comparators to do all the logic switching. That's when
you can really see text book inductor curves etc. A few years ago I
designed a CDI ignition which required a custom toroid inductor. Had to
wrestle with core saturation on that project. Once that was solved the
current through the inductor was textbook. Too cool.

John

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