Naïve Math: The Mendocino Motor and Earnshaw's Theorem

Re:Naïve Math: The Mendocino Motor and Earnshaw's Theorem by mcguire on Tuesday January 22, 2019 @11:00AM (#18969187)

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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Re:Naïve Math: The Mendocino Motor and Earnshaw's Theorem by dubya on Tuesday January 22, 2019 @03:59PM (#18972398)

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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Re:Naïve Math: The Mendocino Motor and Earnshaw's Theorem by mcguire on Tuesday January 22, 2019 @04:43PM (#18972852)

Neat. Now I am impressed.

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