How To Make Invisible Gears With Eddy Currents

I show you how to make invisible gears and make water boil with magnets

[verb]

Now I know why induction cooktops don't get hot to touch but can boil water

[papercrowe]

Yo thanks so much for this! I’ve been trying to design a battle bot with a loosely connected weapon drive so that the motor doesn’t break during hits, and I think something like this but with both sides being magnet gears might be perfect

[peglor]

Drag due to eddy currents from a spinning magnet used to be how car speedometers worked - the same spinning drive from the wheel that incremented the odometer was also used to spin a magnet near an aluminum disk attached to the speedometer needle. A spring pulled it back to zero so it couldn't spin, but the faster the magnet turned, the bigger the angle the needle moved. Modern cars are using the feed from the ABS sensors, converting it to distance for the odometer and to speed to tell a stepper motor how far to move the needle (Or where to draw the needle if a LCD display is used).

[XJWill]

You should compare how much the spinning magnets heat up aluminum compared to steel. There is a reason the inductive cooktops specify that cookware should be magnetic.

[Salted_Pizza]

"Look how the water instantly boils on the coin!"

*proceeds to pick up coin with bare hands*

[babayada]

Hey @Action Lab. The spam comments are getting too high in numbers. Please block the links from chat and add some moderators to delete those nasty comments.

[AngeloGiles]

Very cool video, I always found magnets interesting.

[FASTFASTmusic]

Every time you release a new video I learn something new. Such smart demonstrations. Thank you

[dancoulson]

I wonder if this could be used to make a torque converter for an automatic transmission.
It might be a fluidless design.

[ReneKnuversrk]

Nice video. Eddy currents are used in high speed trains as brakes. An alternating electromagnetic field induces an eddy current in the track which contactlessly pulls on the train, effectively applying a contactless brake force. Much like the oposite of the force that spins your disk

Eddy current brakes are efficient for high speed braking because the track and not a piece on the train is warming up. At high velocities the energy to dissipate is high too (v-squared). At lower speeds the brake force is however not so high. Just like in your setup the torque is at its largest when the magnets were moving and the disk was not. When the ‘gears’ have an equal speed, torque is at its minimum. So when both the track and the train are at a stand still, the EC-brake provide no torque.

[bsebire]

Wow, love this channel. You never seem to run out of amazing new things to show. Keep it up!

[flightmaster]

Always learning something new from you. Pretty cool stuff! Eddy currents are also what allows metal detectors to work. Transmitting coil creates Eddy currents in metal which in turn give off their own magnetic field and thus a sensing coil picks up that magnetic field. Depending on how close that return signal matches the transmitted signal determines how conductive it is and shows a higher number on the target ID or higher on the discrimination level.

[TheSkepticSkwerl]

I wonder how this would work as a torque converter in a transmission instead of a liquid based one. 🤔

[MitzvosGolem]

This is done with pumps and compressors where no shaft seal is allowed.

[terrafirma]

Have you tried making a demo of invisible bearings yet? Instead of ball bearings, magnets are used to eliminate friction.

[atikattar]

I Have A Question.
In Order To Create The Invisible Gear Like This, Do We Need A Conductive Metal (Like The Aluminium Flywheel Shown In The Video) Or It Will Work With Any Metal?
And Also Please Make More Videos Of Magnetic Experiments.

[konoveldorada]

Kid: *I want a Beyblade.*
Mom: *We already have a beyblade.*
The Beyblade: 2:19

[desmond-hawkins]

Cool demo! I'm a bit surprised that James didn't try this in a vacuum, since there will inevitably be comments asking how much of the energy being transferred to one gear to the next comes from the air current created by each spinning disk. Air currents are clearly not the main reason for this effect given how fast the wheels turning, but I could also see how they would add a measurable amount of force that gets passed to each disk from the previous one.

[adamreynolds]

I think it would be cool if you did another video just like this, but include a copper disc or another type of non magnetic metal disc to compare them!

[Thestorminator]

I know this is how some water pumps work. Instead of having a shaft through housing and having to use special gaskets to keep water out, just use the magnetic field through the housing. To ensure a water tight component.