How cute.
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- posted
9 years ago
spinning sphere
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- posted
9 years ago
Yep. he invented a motor.
w.
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- posted
9 years ago
Why the odd angle for the windings, though?
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9 years ago
As long as he's making an air bearing, he should dump all that electronics and make an air motor, too. They go to millions of RPMs.
-- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation
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- posted
9 years ago
You can levitate a golf ball and spin it really fast with just a compressed air nozzle. You point the nozzle upwards, and rest the ball on the air stream (it's quite stable). Then you slowly tilt the nozzle down a bit, and the ball starts to rotate more and more rapidly as gravity pushes it out of the centre of the stream and into the air velocity gradient at the edge.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
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9 years ago
I don't know the max speed anyone has spun a macroscopic object. NMR magic-angle spinning goes above 4 million RPM.
-- John Larkin Highland Technology, Inc jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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- posted
9 years ago
Jesse Beams was able to magnetically levitate a ball bearing, and in vacuum get it up to 1.5 MHz or so, 2500 mph surface speed and a billion g's of equatorial acceleration. The limit was strength of the rotor.
Quite a guy: his 1925 dissertation was on 10 ns time measurements.
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- posted
9 years ago
Drat, I mis-copied the Jesse Beams reference
Parenthetically, that ultracentrifuge was operating in the 1960s and 1970s, and eventually he switched some of the controls to solid state, using the new uA741!
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- posted
9 years ago
Your freon eye can top 2.5 million rpm if you spin it up gently so as not to tear loose the retina.