Rooting around in the fascinating stuff at the bottom of a draw labelled 'Engineering - Junk Miscellaneous'. Delving amongst the delightful...
Ball bearing motors – a mystery?
I had my nose in a book about motors (again), and came across something I don’t remember seeing before.
It consists of a couple of ball bearings and a shaft.
You put heaps of current through the shaft via the bearing outers, give the shaft a flick, and off it spins – or so the book says.
It claims thermal effects are responsible for the continuous rotation, but I feel an electromagnetic explanation is more likely.
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