Magnetic Gearbox Can Go Fast But Not Hard
3D printed gearboxes are good for experimental layouts, but due to roughness and inaccuracies in the printed surfaces, they can wear quickly and be fairly noisy. As a possible alternative, [Resetman] is experimenting with magnetic 3D printed gearboxes that work without the need of physical call between the rotating wheels, and can also be “geared” for various ratios in some appealing methods.
By natural means, two intently spaced wheels with magnets will interact with every other, with the ratio described by the selection of magnets on each wheel. A considerably a lot less evident implementation is a second-order radial flux coaxial magnetic gearbox. It is effective identical to a usual planetary gearbox, with an outer and interior wheel made up of magnets, and an intermediate ring recognized as a flux modulator, containing equally spaced items of ferromagnetic steel metallic. In [Resetman] demonstration, the flux modulator is just a 3D printed ring screws all over its circumference.
The most apparent downside is of system seriously constrained torque transfer. [Resetman] could quickly speed up the solar wheel to 12,000 RPM if the flux modulator is accelerated slowly but surely, but any sudden changes in speed would result in it to drop synchronization. Of study course, you can consider this a torque-restricting element for specific use conditions. With a bit of testing, he determined the torque restrict at a 1:4 ratio was a meager .05 Nm. This could be increased by some optimization, for case in point rearranging the magnets to variety Halbach arrays, and lessening the air gaps concerning the factors.
Magnetic gearboxes are nothing new, we have showcased a further demonstrator ahead of, and even did an “Ask Hackaday” on the matter. What would you use these for? Let us know beneath.
