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

Author: William Beaty

Subject: Re: linear motor

Post:

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
http://www.netcomuk.co.uk/~wwl/bbmotor.html (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,
p.1213.



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