On Wed, 23 Jun 2004 02:04:24 -0500, Richard J Kinch
wrote:

Jim Stewart writes:

It's always dangerous to accuse someone of ignorance.

True. But he did say as much, which is why he asked for advice.

I'll confess I have no experience with these things.

Still, 46 kW in an 80-inch disk that has to stay cool enough to maintain
240 V insulation doesn't seem like it could have much of a duty cycle.
That's about one toaster per square foot of surface area.


Not that I would want to break into this thread too late but,

from the discussions so far it appears the loss of power through the
wire harness is being forgotten. IR losses in DC circuits this size
must be enormus. Any one brave enough to take a voltage reading at the
load end of the wires. If attempted leave your wallet with your credit
cards in the car.

Don't ask how I know this.

As for duty cycle, the magnet is off for the majority of the time.
When engaged, I'm betting the wires are the hottest this in the whole
rig.

My 2 cents

Jim Vrzal
Holiday,Fla.