Gearless Magnetic Transmission - You Can't Break These Gears

Contactless, gearless, silent, lubrication-free axial-flux magnetic gearbox-transmission through permanent magnets(PM). This is actually very similar to axial flux motors, except that there is a flux modulator between the permanent magnet rotors, and that creates a gear ratio between them.
Unlike my previous radial-flux magnetic gearbox, in this axial-flux gearless magnetic gearbox, the interaction of permanent magnets takes place in an axial parallel way, not in the radial direction. And the main reason for designing this axial flux version was the thought that I could achieve tighter tolerances with 3D printed parts than the radial one, so by modifying the modulator or reducing the air gap between the magnets, I was able to significantly increase the torque capacity of this axial flux contactless magnetic gearbox.

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[dominomon]

Interesting fact: neodymium magnets are not indestructible, the heat generated in the eddy curent destroys them

[martin-vvlf]

If you wish to avoid the frictional heating of the rotor bearings, you can use two nested bearings. in theory the bearing with less mechanical advantage will be driven faster than the other bearing, but if the two bearings are magnetically geared together in a two to one ratio, then the load is equally shared, and the theoretical top speed is doubled, before the bearings become too hot.

[tomascancelliere]

If you add thin steel behind each magnet, you can nearly double the pull strength. This is an awesome video btw!!

[rasmnick]

If you place a high permeability metal on the outside faces to couple the magnets together you should be able to almost double the flux inside the gearbox. Inspect how cabinet door latches or speaker voice coil magnets are arranged with metal plates to focus the magnetic flux.

[leanngudmundson]

The way that you made the magnetic gear reduction is GENIUS!

[lmwlmw]

You should use self tightening nuts, that way the vibration will not unscrew the tightening screws. Great video.

[blacklistnr]

Some audio feedback: Your voice has a stronger low-end than its high-end, but you articulate your words with mainly the high-end, this makes for a more difficult listening experience. I suggest an EQ to cut the low mids, boost the high mids and maybe also play around with the highs to make it sound less nasal.
If this is also how you sound without a mic, you might to play with how/where you articulate your words to better engage live audiences.
That's all, I hope it's helpful!

[FPSG]

Very neat idea for low torque applications. There is a limit to how strong this can be with permanent magnets.

[googleyoutubechannel]

Of all the magnetic gearbox videos on youtube, this is one of them!

[UNIMPEEDED]

Did anyone else see the nuts cycle through loosening then tightening over & over? Would love to see the forces pulsating back & forth to do that. Great vid & love the outside box thinking. Cheers.

[Obamaistoast]

This concept was actually built in 1918 it was sold as the transmission you didn't need to shift, Stahl auto museum has one in Michigan

[oryxchannel]

very generous and open heart in your patience and your delivery. refreshing scientist-tinkerer channel. and you saved the best for very last.

[paulrob]

Have a look at particle clutches. They have two cup shaped ends the the in and output shafts, one cup sits inside the other. A soft iron powder is placed inside the cups. There is then a coil that wraps around the outside of both cups, vary the current on the coil which then varies the drive torque through the coupling. They also allow for slip if the torque level is required is exceeded.

[rjkunzli]

i used one of these on my capstone project for mechanical engineering technology. My team and I built a velocity head hydro-turbine but found rotary shaft seals difficult for the generator which was under water (an connected to the turbine). Solved all our problems and worked great!

[damocles]

I was playing with this idea 40 years ago, glad you made it right, you got it is just a mater of the right metal to mass produce, congratulations.

[maxc]

This absolutely so cool and amazing, please keep going with this concept. I love it so much. I wanna see this used in car or other applications.

[stickyfox]

There is not so much friction, but I bet there's hysteresis and eddy current loss, especially when the drivetrain is loaded. I'd love to see a quantitative comparison between a gearbox.

[dougriedweg]

Great job as a retired mechanic I love the way you approach gear reduction

[sli-fox]

Very cool! A more advance setup would be to alter the polarity electrically to get whatever gear ratio you want. Very nice!

[ProDMiner]

I seriously love science, this is the coolest stuff ever. Need one of these for a electric mtb transmission.