In 2021, Turkish scientist Hamdi Ucar found out a unique type of magnetic levitation, the place a hastily rotating magnet led to a close-by magnet to levitate. This phenomenon, which defied classical physics, used to be replicated and studied by way of Professor Rasmus Bjørk and his group. They discovered that the levitating magnet aligns with the spinning magnet, growing an equilibrium similar to a spinning most sensible. Credit score: SciTechDaily.comScientists from the Technical College of Denmark (DTU) have showed the underlying physics of a newly found out phenomenon of magnet levitation.In 2021, a scientist from Turkey revealed a analysis paper detailing an experiment the place a magnet used to be connected to a motor, inflicting it to rotate hastily. When this setup used to be introduced close to a 2nd magnet, the second one magnet started to rotate and abruptly hovered in a set place a couple of centimeters away.Whilst magnetic levitation is not anything new – the best-known instance is most probably Maglev trains that depend on a robust magnetic pressure for elevate and propulsion – the experiment at a loss for words physicists as this phenomenon used to be no longer described by way of classical physics, or, no less than, by way of any of recognized mechanism of magnetic levitation.
Magnetic levitation demonstrated the usage of a Dremel device spinning a magnet at 266 Hz. The rotor magnet is 7x7x7 mm3 and the floater magnet is 6x6x6 mm3. This video displays the physics described within the analysis. Credit score: DTU.It’s now, alternatively. Rasmus Bjørk, a professor at DTU Power, used to be intrigued by way of Ucar’s experiment and got down to mirror it with MSc pupil Joachim M. Hermansen whilst working out precisely what used to be happening. The replicating used to be simple and might be performed by way of the usage of off-the-shelf elements, however the physics of it used to be unusual, says Rasmus Bjørk:“Magnets must no longer hover when they’re shut in combination. Typically, they’re going to both draw in or repel every different. However if you happen to spin one of the most magnets, it seems, you’ll be able to do so soaring. And that’s the unusual section. The pressure affecting the magnets must no longer exchange simply since you rotate one in every of them, so it sort of feels there’s a coupling between the motion and the magnetic pressure,” he says.The effects have lately been revealed within the magazine Physics Evaluate Implemented.A number of experiments to substantiate the physicsThe experiments concerned a number of magnets of differing sizes, however the primary remained the similar: Through rotating a magnet very rapid the researchers noticed how any other magnet in shut proximity, dubbed a “floater magnets,” began spinning on the identical velocity whilst it briefly locked right into a place the place it stayed soaring.They discovered that because the floater magnet locked into place, it used to be orientated as regards to the axis of rotation and against the like pole of the rotor magnet. So, as an example, the north pole of the floater magnet, whilst it used to be spinning, stayed pointing against the north pole of the mounted magnet.That is other from what used to be anticipated in line with the rules of magnetostatics, which provide an explanation for how a static magnetic machine purposes. Because it seems, alternatively, the magnetostatic interactions between the rotating magnets are precisely what’s answerable for growing the equilibrium place of the floater, as co-author PhD-student Frederik L. Durhuus discovered the usage of simulations of the phenomenon. They noticed a vital have an effect on of magnet dimension on levitation dynamics: smaller magnets required upper rotation speeds for levitation because of their greater inertia and the upper it will glide.“It seems that the floater magnet desires to align itself with the spinning magnet, nevertheless it can’t spin rapid sufficient to take action. And for so long as this coupling is maintained it’s going to hover or levitate,” says Rasmus Bjørk, and continues:“You could examine it to a spinning most sensible. It is going to no longer stand until it’s spinning however is locked into place by way of its rotation. It’s only when the rotation loses power that the pressure of gravity – or in our case the rush and pull of the magnets – turns into big enough to conquer the equilibrium.”Reference: “Magnetic levitation by way of rotation” by way of Joachim Marco Hermansen, Frederik Laust Durhuus, Cathrine Frandsen, Marco Beleggia, Christian R.H. Bahl and Rasmus Bjørk, 13 October 2023, Bodily Evaluate Implemented.
DOI: 10.1103/PhysRevApplied.20.044036
