Once in a while, it would be nice to have motion without magnetic fields. Anything with a compass, for instance. Maybe you also want to drive a little needle, or unlatch a door, or… whatever. Camera lenses have had ultrasonic motors in 'em for years. I believe it’s a ring of piezoelectric material,…

Ultrasonic motors?

lyndon February 18, 2018, 6:42pm 2

Muscle wires?

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