electro-Physics: 17.3409 volts

From: Paul Koning <pkoning_at_equallogic.com>
Date: Mon Dec 13 16:11:21 2004

>>>>> "Patrick" == Patrick Finnegan <pat_at_computer-refuge.org> writes:

 Patrick> On Monday 13 December 2004 16:42, William Donzelli wrote:
>> > Who would be using DC besides electro-platers?
>>
>> Old elevators. Lots of old elevators.

 Patrick> And, lots of not-so-old elevators.

Some machine tools, too.

I remember seeing a large planer -- 12 foot stroke, roughly -- that
used a DC motor for the bed drive. The idea was that you would get
the back & forth motion of the bed by throwing the motor from forward
into reverse or vice versa at each stroke endpoint.

The notion of reversing polarity on a big honking DC motor under full
load, moving several tons of steel at pretty substantial speeds, was
amazing, but it worked and the magic smoke stayed where it belonged.

That machine had a dedicated motor/generator set on it.

     paul
Received on Mon Dec 13 2004 - 16:11:21 GMT