Re: magnetism question

Don Kelly wrote:
> A non-stick pan doesn't have to contend with changes in dimensions of the
> rotor and stator as they heat up and put the squeeze on. There is also the
> problem that nothing is "perfectly true". This increases with the size of
> the machine. The limitations are mechanical.

Pans stretch when they heat, so your objection is ungrounden. The
stretching to and fro wreaks the teflon to flake off. The limitations
are economic only. Grandparent clocks use a mercury-steel pendulum to
fix length-shifts with temperature to keep the same heftmidst
(barucentre).

> I ran an experimental motor with an aluminum shell rotor- all was good until
> the rotor heated up- then the squealing started and, if left, the rotor
> would have jammed on the stator. A teflon coating wouldn't have helped

I didn't say teflon; I said iron glass. And if you had made the same
corrections to the stator, it wouldn't happen.

-Aut

.

Relevant Pages

  • Re: magnetism question
    ... A non-stick pan doesn't have to contend with changes in dimensions of the ... rotor and stator as they heat up and put the squeeze on. ... A teflon coating wouldn't have helped. ...
    (sci.physics.electromag)
  • Re: magnetism question
    ... >> rotor and stator as they heat up and put the squeeze on. ... > stretching to and fro wreaks the teflon to flake off. ... Pans stretch when heated- true- but take two snugly nested teflon coated ...
    (sci.physics.electromag)
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