On Aug 2, 2009, at 8:21 PM, Kyle Mcallister wrote:
Keep us posted as to your results. Very interesting, to me at least.
--Kyle
Here's the full write-up updated through today's experiments:
http://www.mtaonline.net/~hheffner/HullMotor.pdf
It has links to videos of the control (ordinary magnetic bearings)
and live (non-magnetic stainless steel bearings) runs.
A couple 24 hour washes, one mineral spirits, the other acetone,
cured the intermittent conduction problem.
I'll have to reduce or eliminate the current sense resistor to have a
chance get the series run to work. I'm not sure it is necessary to
make a series run however. It is clear from the videos that the non-
magnetic bearings don't produce torque. In fact, when current is
applied they brake, probably due to the arcing. In both live and
control runs a grinding noise can be heard as power is supplied, and,
based on the breaking effect for the live run, I expect it is
probably due to arcing.
I have realized that the videos don't have to be very convincing,
because anyone who wants to convince himself can order the bearings
and try it himself.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
