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- เผยแพร่เมื่อ 26 ส.ค. 2022
- How about instead of a physical-contact gear meshing, a magnetic meshing by permanent magnets?
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Magnetic gears has an engagement that is completely non-contact through magnetic forces, which gives them many advantages, such as much quieter(!) and lubrication-free operation.
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One of the reasons these would not see widespread use is reduced efficiency due to eddy-current losses within any nearby metal components, and you would want a low reluctance metal housing to ensure you don’t induce voltages into nearby wires.
One of the big issues with these is their load bearing capabilities. Unlike a regular gear these will not be rigid under load, which is fine for some applications, but they can't really be used in applications where you cannot have chatter unless you combine them with some kind of active load balancing from an electromagnet. Very useful if you want to rotate something inside of a sealed container.
What a beautifully detailed video. This felt like a university level report on a personal project. Really enjoyed the details, the discussion, and the examples. Gave me some good ideas for possible future projects. Thanks for such a high quality video report on this project!
We actually do see magnetic gears in limited applications, though their practical use is mostly for things where high speed low maintenance designs or inherently safe designs are required. In most cases they are used in hazardous material handling where shaft seals could be a major and rapid point of failure in a system where chemical leaking is incredibly hazardous to both life and the environment. Usually you see this used with a 1:1 ratio in magdrive pumps. They lack the flux motivator and instead work as a simple magnetic coupling, but they are still a power transmission with an input and output that closely resemble your designs. They are also used in some applications where wear-less torque limiting is required, such as found in some scientific and industrial machines.
I noticed a lot of small water pumps and generators use magnetic coupling to keep the electrical parts sealed; there’s no shaft coming from the motor that needs a seal that will eventually fail. They aren’t using magnetic gearing but it seems like a good place to apply the use of them if needed since there’s already magnetic coupling limiting the force that can be applied to the output by the motor anyways.
Coming from a cycling background. A great application of this is the Kurt Kinetic Fluid Trainer. The resistance unit/fluid chamber and fan is completely sealed up and never leaks. A magnetic gear transfers the force.
Wow, you did a great job visualizing and explaining everything! I'd never heard of using ferrous, non-magnetized components to redirect the field lines of permanent magnets like that. That is such a cool idea!
Because it uses magnetic field to drive the output shaft, it is very similar to a motor..
If you apply a voltage to the central gear, and attach it to a rheostatic variator, it should be fairly easy to alter the magnetic flux of the central gear to allow it to slip more or slip less of the input and output gears, thus acting as an electric torque converter. I've had almost the same design drawn up.
I love this please keep pursuing this!! Your explanations are very easy to follow and entertaining
I had an old fax machine that used magnetic reduction to drive the drum. There was a 4 pole rotating magnet, a flux guide, & an outer steel internal gear. The construction resembled a harmonic "wave" drive, in that the flux guide & the outer gear differed by 4 teeth.
Very interesting video. This magnetic driving technique has been used for years with water pumps in fish tanks etc. However, I am really appreciating your explanation of how the magnetic field can be used to form a gear ratio... very well done! (Subscribed!)
Direct drive is much simpler and has the same inherent overload protection. I don't see why the magnetic interaction in the gearbox would ever be more powerful than the magnetic interaction in a motor of the same diameter.
I think a design based on a stepper motor configuration might make lots more torque and variable torque. Good video. I liked it.
Excellent tutorial. Your explanations are useful to both the lay person and expert. Well done.
Your production value is crazy. I can't imagine how long this video took to put together, it looks amazing
I love your use of magnetic viewing film here, it makes the moving fields much more clear!
Really great job. You explained things very well. Fascinating what magnets can do. Keep up the good work!
You really nailed the principle of magnetic gearing. I learned a lot from this video. So, what kinds of applications do you see this magnetic gearbox for?
to answer your question: "Why no-one talks about this?" -- very simple. It is physically impossible to make a magnetic gear system that has more output torque than a motor of the same size and geometry can generate on its own without gearing.