Flywheel/Encoder patterns

Todd Knighton knighton at net-quest.com
Sun Dec 8 23:39:55 GMT 1996


Chris Morriss wrote:
> 
> A neat and very reliable solution to taking up the backlash is to mount
> an eddy current brake on the shaft.  Much easier than providing viscous
> drag.  All you need is a plain aluminium or copper disk rotating in the
> gap of a horse-shoe magnet.  Like a old electricity meter. (If you had
> the rotating disk meters in the US)  The principle was also used as the
> speed control a#on the old but revered Garrard 401 record turntable.

	Pardon my ignorance, but what effect does a magnet have on a non
metallic element like aluminum or copper.
	How's it work?
	And what kind of drag can you expect from such a device?

Todd Knighton
Protomotive Engineering



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