then there's mercury slip rings: these don't have a brush, instead they just have liquid mercury that maintains a continuous contact with less interference.pic.twitter.com/ugcZnhZR7t
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then there's mercury slip rings: these don't have a brush, instead they just have liquid mercury that maintains a continuous contact with less interference.pic.twitter.com/ugcZnhZR7t
but the final type... is the wireless slip ring. What. Wireless? The whole point of a slip ring is to electrically connect a stationary thing with a rotating thing! If you could do wireless, why would you need a slip ring?
and it turns out the reason is: POWER! You have a device that needs to rotate, and it needs power (and signals) So you need a way to get power and data in and out... but regular slip rings are too electrically noisy, and wear out, and mercury is too dangerous...
So the answer is WIRELESS SLIP RINGS! Also known as a rotary transformer. Basically, you build a bunch of little coils around each other, and this becomes the primary side of the transformer, with the secondary side being in the rotating part.pic.twitter.com/kxGNRDCwu2
the quick TL;DR of how a transformer works is that you have some magnetic core, and two coils of wire with different numbers of windings. The varying current in the primary creates a magnetic field which creates another varying current in the secondary.pic.twitter.com/X2SGm5yqfA
but the core can be all sorts of things, including just... air. It won't work as well (because an iron/steel/whatever core has less loss at lower frequencies), but it'll work. You're just turning an AC signal into a magnetic field and back.
This, btw, is how the wireless charging in your phone works. There's a coil inside your phone, and the matching coil inside the charger creates a magnetic field that gets turned back into a current inside your phone.pic.twitter.com/oFIVufcFFL
but back to wireless slip rings... do you know where they were primarily used, and why you might have had one? There was something very common, in most households, which needed to have a part spin very fast for a long time (without breaking), with power and data...
darn I was too slow w that guess
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