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Re: Single shaft motor - Ed Wingate?

Original poster: William Beaty <billb@xxxxxxxxxx>

Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>


> One possible way to help determine if magnetic or thermal effects are at
> work would be to expose the motor to a large external DC magnetic field.
> If magnetic effects are driving the motor, this might have some visible
> effect on speed or acceleration rate.

Interesting that nonferrous bearings work fine. A better test would be to
build a version where the "thermal hump" cannot function.

Do brass ballbearings exist?  Or some other material which is wettable by
mercury or liquid gallium?  Disassemble your ballbearing race and skin a
bit off the inner race so it doesn't make solid contact with the balls.
Then reassemble it and wet the balls with liquid metal to restore the
electrical contact across the gap.  If "thermal hump" is the driving
force, then these loose sloppy metal-wetted bearings won't work.

  Liquid gallium (galinstan) $24, scitoys.com
  https://secure.avdns7.com/~scitoys/cgi-bin/shop.exe?page=order_form.html&QX=0a&SID=2216725060&buy=1&item=77


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William J. Beaty                            SCIENCE HOBBYIST website
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