Halbach array
This Halbach array focuses all of the combined strength of the 12 tiny 10 mm block magnets to the center: This one has a 3D printed form. The Halbach array ID can be any diameter; Imagine a bismuth axle as thick as the center hole in this array:
https://www.youtube.com/watch?v=Z4PYTD8B4wA
Another video with a circular Halbach array magnetic field image through a magnet viewer:
https://www.youtube.com/watch?v=qv-9IAj_YnI
A 3D printed rotor holder could hold 24 Halbach array magnets, half on each end and the center fitted for two powerful block magnets to revolve around a thick bismuth axle. This type of rotor may "Free Wheel" indefinitely inside a vacuum chamber. The bismuth assembly can easily mold with side bushings to fit snugly inside a clear protective PVC housing, and the chamber could evacuate with a hand held squeegee ball.
This Halbach array focuses all of the combined strength of the 12 tiny 10 mm block magnets to the center: This one has a 3D printed form. The Halbach array ID can be any diameter; Imagine a bismuth axle as thick as the center hole in this array:
https://www.youtube.com/watch?v=Z4PYTD8B4wA
Another video with a circular Halbach array magnetic field image through a magnet viewer:
https://www.youtube.com/watch?v=qv-9IAj_YnI
A 3D printed rotor holder could hold 24 Halbach array magnets, half on each end and the center fitted for two powerful block magnets to revolve around a thick bismuth axle. This type of rotor may "Free Wheel" indefinitely inside a vacuum chamber. The bismuth assembly can easily mold with side bushings to fit snugly inside a clear protective PVC housing, and the chamber could evacuate with a hand held squeegee ball.
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