Date: Sun, 24 Jun 2001 14:28:44 -0700 (PDT)

Author: William Beaty

Subject: Re: linear motor


On Mon, 25 Jun 2001, Liane Williams wrote:

> Another variation found was the parallel conductors, with no magnetic
> field and a ball-bearing sitting on the rods. When a current conducts
> through the rods (and bearing), it rolls.

This sounds like the "Marinov motor", a pair of ball-bearing races on a
metal shaft, with a high-amps power supply (single car battery) connected
to the exterior of the races (path of current going through the individual
balls and along the shaft.) See (Note that the two large disks
in the photo are flyweels; the bearings are smaller and clamped between
pcbs in the vice.)

He gives this ref, among others:

Gruenberg, H. The ball bearing as a motor. Am. J. Phys., vol. 46, 1978,

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