On Fri, 13 Jan 2006 21:44:38 -0600, "Robert Swinney"
wrote:


Jim, go back and read axolotol's statement about 4 posts above. Insulated
lams are not required, and probably not desireable. There can be no shorted
turn effect because current in the windings cannot be diverted to the
lams -- unless, of course, there is a short between the windings and the
lams. Actually it would take 2 shorts in 2 different places on the winding
to cause appreciable current to flow in the lams. Read that, other than
eddy currents, which the lams are designed to suppress.

Bob Swinney

It isn't about current connected from windings to lams. It's about a
closed conductive path enclosing the time-varying flux in the core.
Any closed conductive path enclosing the flux linking the winding is
a shorted turn.

Individual lams are still little shorted turns, but they each
individually enclose relatively little flux so eddy currents induced
in them are minimized.

A weld along one side of the stack doesn't create a closed path so it
doesn't hurt anything. If you placed another weld on the other side
of the stack, it would be a very different situation.