We offer neodymium discs, rectangular or square neodymium blocks, bars, rings and rods, in a wide range of sizes, premium grades and finishes. carries a large inventory of licensed, neodymium Rare-Earth magnets available for immediate on-line purchase at bulk discounted prices. Due to their high magnetic strength and relatively low-cost, they are the preferred choice for many consumer, commercial, industrial and technical applications. Part of the Rare-Earth magnet family, they have the highest magnetic properties of all permanent magnets. Neodymium magnets (also known as “NdFeB”, “Neo” or “NIB” magnets), are strong permanent magnets made from an alloy of neodymium, iron & boron. A fun experiment, for sure, but it didn't seem worthwhile for a whole blog article.Strong Permanent Magnets with High Magnetic Properties That led to us wonder: Could we heat up a penny if we just moved it faster, relative to the magnets? We did a quick test with some magnets on a disc attached to a drill press, which quickly heated up old pennies quite nicely. It probably wasn't necessary, but is a fun way to get a strong field there. The two different penny materials responded quite differently! Of course we had to one-up the game and use a Halbach array of magnets, instead of a single magnet. It wasn't too hard to replicate his results. It was so cool, we just had to try it ourselves! He used a neodymium magnet to sort out old copper pennies from newer pennies that are only copper plated. How did we end up doing such an oddball experiment? It all started when we watched a recent Cody'sLab video on YouTube. Eddy current brakes that halt spinning parts of machinery or stop roller coasters in their tracks must have a plan to dissipate all the heat that builds up. Still, this was an interesting look at just how much heat can be generated with a simple eddy current system. Obviously, we’re not likely to announce any entries into the inductive stove-top market. It is clear that the regular stovetop is pushing a lot more heat into the pan a lot faster. We halted the experiment before exceeding the IR thermometer’s limit, or sensible limits for heating Teflon, about 260☌ (~500☏). The yellow line on the graph shows pan temperature rising much more dramatically on the author's stove. The ultimate, leveled-off temperature is also much hotter. The heating element on an electric stove gets much hotter than the temperatures we’ve been experiencing with our DIY inductive stovetop. For a reality check, let's compare these inductve results with something we're used to. Most of us are more familiar with how a pan heats on a gas or radiant electric stove, even if we haven’t measured temperature profiles. We exceeded 100☌ (212☏), but probably wouldn’t get much higher than 120☌ (248☏) if we let it run longer. The pan temperature rose much higher, though it also leveled off. The second attempt used stacks of two magnets, which increased the field strength at the pan. By 50☌ (122☏), the temperature rise was really leveling off. In our first attempt with the copper-colored pan, we heated the pan up to over 40☌ (104☏). This happens because heat escapes the pan through conduction, convection and radiation. As it gets hotter, the temperature should level off at some point. We expect the temperature to rise quickly as heat is added. On any stove, we add heat to the pan to raise its temperature. How much energy are we putting into the pan? How does it compare with a traditional radiant stove? Check it out!įrying an egg is fun, but there are some more technical, underlying things going on here. This video shows our trials and errors getting this thing running. They also don't work well at all on aluminum or copper pans, sadly. They use coils of wire and run electricity through it as an electromagnet. Those stoves don’t use a rapidly spinning array of magnets like we’re trying here. They are more expensive than radiant stoves, but can be more efficient. You can buy one for your kitchen right now. Note: Inductive stove tops are a real thing. The magnetic field swings from +1000 gauss to -1000 gauss as the magnets pass by. When the array spins, a given point on the pan sees the magnetic field changing from north to south. The magnets are mounted so that the poles facing up alternate between north and south. A conductive (aluminum) pan above these spinning magnets should “see” a changing magnetic field that becomes heat. We created an array of magnets that can spin very quickly, sitting just beneath the pan. To fry an egg, we need to induce currents in a frying pan instead of a pipe. The poles facing up alternate in this array of ten BX884DCS magnets.
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