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Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

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Re: it does seem a bit magical........

Posted by J.D. on January 28, 2007 at 15:53:23:
Think you're right about "eddy brake might offer a means of smoothing/filtering out at least some of the cogging effect off the motor" ...
If you've played around with different weights of bearing oil, (I'm thinking belt here) you may have noticed that there tends to be a certain 'weight zone' that's right for a given motor & platter.
Too heavy and it's too much, but too light and, even though the actual 'spin' is great, the proper amount of resistance is missing... and there's a stability loss.
It seems a similar principle to the eddy current brake. The eddy provides a very graceful, non-mechanical force that operates against the direction of the motor --- a kind of oppositional flywheel effect, in the sense that it doesn't carry the inertia of a rotating rotor but works against it....
And like the 'Goldilocks' proposition of the oil-weights, there's an amount that's just right.

Wonder why beltdrive doesn't use it....
Maybe it can't be used properly against small synchronous motors which wouuld always be trying to get back to their frequency-regulated speed... Not sure.