How To Make Invisible Gears With Eddy Currents
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- Опубликовано: 17 янв 2022
- I show you how to make invisible gears and make water boil with magnets
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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).
Dude just induction motor is example
I messed with a few of them and can say they are kind of neat to play with. Little hard to tune though but repining the needle while moving at a certain speed was usually good enough lol. Tend to stick and bounce when it's really cold though so I used to bang the dash till it moved again. I guess leaving it alone until the disc heated up could thaw it and move again.
I have always wondered a little how the old ones worked. Thank you!
Thx. If I'm picturing the same type (would have been GM), I recall thinking... I don't know how this works. Fluid-like coupling but no fluid; no friction. Hmm, put it back together.
old electricity meters also use eddy currents
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
Damn, that would be cool.
A ball detent style breakaway mechanism would be much lighter and give you the same effect of limiting torque and shock transmission. You could also just use magnets of opposite poles in the two spinning parts to connect them so they spin together with far fewer magnets, less weight and no slip between the two parts until one is stalled. The benefit of using eddy currents would be that you could use a stationary set of coils being powered in the correct sequence to make an aluminum part spin, like in an AC induction motor and reduce the number of moving parts you have.
Now every battlebot sticks to you
Maybe that's a good idea for a weapon, a magnet grapple
That would be super weak wouldn't it?
@@theirishaxe9405 I think so, if the weapon has a lot of mass it would give a hard hit, but since it's spinning just by magnets it would take a lot longer to catch speed again after every hit
Now I know why induction cooktops don't get hot to touch but can boil water
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.
Good question. I know that copper responds better than aluminum. Steel would be attracted to the magnets so I don't know if that will work.
I'm pretty sure that most induction cook tops use a sensor to switch off if there is nothing there. That sensor may be based on doing a magnetic check meaning that even though the material is conductive and technically could work it is invisible to the cooktop. This is also a way to protect things like phones and other electronics from the cooktop literally frying them.
@@MascottDeepfriar No, that is not how induction cooktops work. They do not shut off "if there is nothing there". And iron or magnetic steel cookware heats up more than other metal cookware.
@@XJWill1 both my cheap and expensive induction cook tops turn off if there is not a viable piece of cookware on it. So I'm not sure what you mean by that.
@@MascottDeepfriar Some induction cooktops may have an additional circuit that checks for how much power is being consumed by the induction coupling and turns off if it is too low, but that is not a primary or necessary functionality for an induction cooktop. More to the point, your claim is simply false that the reason magnetic cookware is specified for induction cooktops is to enable a circuit that cuts power if there is no magnetic cookware on the cooktop.
"Look how the water instantly boils on the coin!"
*proceeds to pick up coin with bare hands*
Wow using my currents I see
Dude, why are you so powerful?
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.
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.
That is fucking cool! Thanks so much for sharing!
So how much torque could these sorts of "invisible gears" produce?
@@3nertia lorentz’s laws will tell you
Good point
Yes
Wow, love this channel. You never seem to run out of amazing new things to show. Keep it up!
Every time you release a new video I learn something new. Such smart demonstrations. Thank you
great demo! I’ve always been interested in eddy currents induced by magnets. Another neat thing is to see how a neodymium magnet like the ones you are using will slide slowly down a nearly vertical piece of aluminum and not fall off,, but I’m not telling you anything new here! its just cool. Love your channel !
This was actually the subject of my capstone design project. We used eddy current disk braking to construct a dynometer for small electric motors. The math behind those eddy currents and how they relate to torque is oh so fun.
I’ve always had no clue as to how induction stove tops work, this video explained it perfectly. Very interesting, keep up the good work!
We just finished the magnetism topic for my gcse and was ashamed when eddy currents were only mentioned briefly not covered because they are very interesting and I wanted to learn more about them and their uses so thank you for covering them
You'll be sad to hear that they barely get mentioned at alevel 😞
@@jamiepritchard8179 :(
Amazing demonstration, once again! This one is of particular interest to me. Keep up the great work!
2:23 Electroboom moment.
Except, he'd say f*** s***, then cut to himself talking.
2:22 I thought only ElectroBOOM would do so but you grabbed the coin that flash-boils water with your bare hands!
I was laughing so hard!
You're awesome brother! Millions of subscribers, yet underrated... Awesome vids🙌
My son and I love watching your videos. They are entertaining and educational! We hope you continue to make any more.
I remember back in 69, I took apart a speedometer from a 1961 -" Ninety Eight" Oldsmobile and saw an aluminum cup-shaped metal on one end and a magnet attached to the cable that ran from the transmission. I knew very little then about magnetic uses in things but once I saw this combination, it hit me how it worked.
Indeed. I took out a speedometer from a 96 mazda and only years later actually discovered how it worked. Neat stuff.
This is done with pumps and compressors where no shaft seal is allowed.
This channel is so underrated, love your content!
I love eddy currents.
We, in sec. school, made an Eddy current waste separator.
We were able to separate alumunium, brass like metals from waste misture. When waste materials were convayerd over the spinning neodymium magnets, chunks of non ferrous metals would jump out off the waste material and get collected in a separate bin.
After so long I really understood what Eddy current is, I vaguely got it when I read about it multiple times but now after visualising it in a experimental form I could understand it.
This has got to be one of the most interesting videos in the channel for me so far. Just the very sight of aluminum interacting with the magnetic field blew my mind away!
Thank you sir for giving us such demonstrations.
You made basic versions of so many car parts in this video, from an alternator to a (really basic) automatic transmission. Love to see it. :)
I really like your videos! They are very entertaining and educative
Your channel is great, thank you for the content!
Best demonstration of Eddy currents yet.. so thanks..
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.
Hm, interesting thought. You could be right, but when I imagine two metal disks spinning one above the other like in his setup (but not magnetic) my gut instinct is that the spinning one wouldn’t impart any meaningful amount of spinning force on the other due to air current. I could be wrong though. So it would definitely be interesting to see!
@@droam129 Yes I agree that given the shape of the discs he was using (relatively flat and not really "catching" the air around them) it's unlikely they would transfer much energy between them, certainly not as much as what was demonstrated here. But if their surface was more rough or even had raised tabs and they were mounted on their axes in a way that limits friction as much as possible, you could definitely make them spin without touching with just air flow. Really anything other than a perfectly flat disc spinning completely horizontally _will_ impart some force. Just not much.
hey everyone today im going to be showing what would happen when you put the invisible gear machine in vacuum
(intro to his next vid)
@@rakshithg9669 It's impossible to read this and not hear his voice.
They burn up faster. The air passing over the inducted disk actually helps keep the metal cool and stable. If you put it into a vacuum, there is no heatsink effect and thus the inducted disk will eventually overheat and fail. This is a common problem for eddy current clutches that get insufficient airflow or in vacuum-state applications when their duty cycle is too high.
Вы умеете удивлять! Класс.
You constantly surprise me with your topics. The way you demonstrate and describe the physics is so familiar, so easy to understand. I want my grandkids to learn physics from you… when I have grandkids.
This is the kind of thing I'm interested in so I love it! Thank you for this one 👍
Super cool. You are so skilled and knowledgable
Very cool video, I always found magnets interesting.
That was a good one!!! Really cool and fun to learn!!!
This was one of the coolest Things you ever showed! Anything about Magnets actually!
I wonder if this could be used to make a torque converter for an automatic transmission.
It might be a fluidless design.
This was a super awesome video!! That was so neat how that works!
i love your videos they're so entertaining to watch.
Ok, this is one of the coolest experiments to date!
Have you tried making a demo of invisible bearings yet? Instead of ball bearings, magnets are used to eliminate friction.
Another great video. It would be interesting to quantitate torque vs distance or composition of flywheel or field strength or angular velocity of the rotating magnets (so many variables to play with!
Amazing Gears... Absolutely Brilliant
I love your demo. They awesome. You make science cool.
Just reminded me of the magnetic clutch used in the old Big Trak gear-box to make both DC motors spin at the same rate.
Thank you for this insipirational video!
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.
The most common version of this is the magnetic stirrers you see in every chemistry lab, that are driven by electromagnets integrated with the hot plate the beaker sits on. I used magnetically coupled gear pumps from Tuthill Pumps back in the day for one system I designed and built.
Actually, that same principle is the one asynchronous motors use: they have a non-magnet rotor spinning to avoid overcurrents during startup or load changes (as opposed to synchronous motors with a magnetic core). When three-phase current runs along the coils of the stator, it creates the variable magnetic field you make with the spinning magnets. This has the disadvantage of having a variable speed depending on the tork they have to overcome, but nowadays are more used than synchronous for big force requirements afaik.
You have better knowledge than many professors around the world! I love your ideas!
That was awesome as always 👏
I have seen slip clutches on big industrial drives that had magnets on both wheels but not something that was "geared" like this. Cool idea. Using eddy currents you can have a loosely coupled and geared slip drive (consumer air fan) and with magnets on both wheels you can do the same with nearly no slip (Industrial or automotive transmission?). Particularly useful since the slip can be modulated like an automotive clutch.
Your a genius, thanks🎉
Your Really coming together
This is awesome, thanks! ❤️
Thanks a lot man I had no idea induction cooker was made using this principle , in fact I didn’t know that eddy current could heat up a conductive metal resting above ! Wow
I know that eddy current is used in the train brakes but wow
Nice & interesting experiment bro.
Thanks for sharing it with us.
Great video! Keep going!
this is my favorite video so far
That heating part was very nice 🔥
This man is always blowing my mind
Thanks sir👍😁 now you give me a new idea , keep it up sir 🙏🏻👍😊
I love this kind of invention 😮
Wow I was just talking about trying this. Thanks for this. My idea was a little more complicated.
Always interesting!
time in this channel passes faster than in real-world your channel itself is an example of a frame of respect.
Damn
U r something inovative man💖
Amazing engineering experiment sir ❤️
It wouldn't be an Action Lab video without an ”Ouch!".
Interesting. Thank you.
This guys nailed it
Very cool, many applications when you think about it
Thank you 🤝
Watch me boil water on this quarter; then he grabs it with bare fingers. That was an Electro Boom moment. 😂🤣
It'd be cool to see these stacked
It would be interesting to see the heat formed from the eddy currents with a thermal camera!
🤯 so many ideas!!
Sir can you please start a channel to discuss the basics and complex phenomenos of physics..for understanding ❤️❤️..love your videos bro
This man really grabbed a coin that he boiled water off of while it was still heated. Bravo and props for leaving it in
Very recent, nice experiment!!
I wonder how this would work as a torque converter in a transmission instead of a liquid based one. 🤔
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!
Did you really watch the video?
@@fendysusanto876 :D
Really neat phenomenon awesome videos. The aluminum flywheel? Just a touch off center :) tip: never un-chuck work from lathe until done.
Works a lot better with magnets in the reciever gear, gear reduction and direction is based on ratio.
Super cool!
I'd like to see whether this actually gears up, ie higher torque at lower rpm, and whether it is more efficient than a transmission. I can see this benefitting a boat propellor
You should have discussed how the magnet disk slowed down when you were holding the aluminum disk still to highlight the generated magnetic field acting on the permanent magnets
You can also use a similar setup to make gears of a specific ratio. I made a video about this if you're interested.
Thank you tsharing the lessons thank you girls
And that's how we can make hot coffee with a coin.
Great content here!
Dang this vid sparked so many ideas that I will never do lol
That was all awesome 🔥i would have done same thing too .When I saw that coin spin I would have grabbed the hot 🔥 coin and burn 🔥 myself cause I wanted to see if the other coin would stay spinning if the glued down 1 was out of the way. Love all your videos
You should try an actual gear inverter using magnets.
You place a sandwich of these alternating magnets on a ring pattern with another ring with ferromagnetic materials in place of the magnets in the middle.
When you turn one of the magnet rings the other ring will turn on the opposite direction without touching.
Gear reduction also works by using different number of magnets.
It's cool stuff, and honestly it'd be nice to build a vehicle which used magnets to keep parts from touching, to prevent wear. I imagine it would be possible, not sure how difficult or expensive it'd be.
This could be great for other applications
Eddy current clutch used in diesel locomotives to rotate the radiator fans.
Thanks!
Thanks brother
Excellent! You can make a charger or wifi electricity with it.
love it very interesting