Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit

In a message dated 6/20/2002 6:09:39 AM Mountain Daylight Time,
bjammin@... writes:

>
> At 03:14 AM 6/20/02 +0000, you wrote:
> >> Shorting the armature of a motor while it is spinning at high
> >> speed will also cause 50-100 times rated current to flow.
>
> I'd like to see the math on that.
>
> >> with a short, there is no current limit.
>
> Sure there is; the windings themselves have resistance.
>
> >> of one case where the semiconductors in a DC drive failed,
> >> shorting the armature of a 25 HP motor while it was spinning
> >> a roller on a paper machine (high inertia load). The fault
> >> current generated enough braking torque to

I think that this thread needs to be brought to the subject matter.
bill
List Mom


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