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Naïve Math: The Mendocino Motor and Earnshaw's Theorem (habr.com)
46 points by haqreu 2709 days ago
1 comments
mcguire 2708 days ago
Ok, so how are these things stable?

https://duckduckgo.com/?q=floating+magnetic+globe&t=fpas&ia=...

Yes, the base is an electromagnet, but AFAIK the field is static when energized.

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dubya 2708 days ago
The field is not static when energized. The hanging ones are not too hard to make with a Hall effect sensor and an electromagnet. This is a good explanation:

https://www.kjmagnetics.com/blog.asp?p=electromagnetic-levit...

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mcguire 2708 days ago
Neat. Now I am impressed.
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