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Physics
Classical Physics
Electromagnetism
Magnet system efficiency made from neodymium magnets
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[QUOTE="jrmichler, post: 6059955, member: 638574"] Be careful when working with neodymium magnets. The magnets in the photo below are 3/8" (9.5 mm) thick. Three of them were installed on a steel block side by side, all three with the north face up. They were too strong for the technician to lift and place them, so he set them one at a time on the block, and slid them into place between aluminum guides. He could get the first two magnets into position, but was not strong enough to push the third magnet into position. He had to design a jack screw mechanism to get the third magnet into position. Since all three were installed with the same pole upward, there was a strong repulsion between magnets. After the epoxy hardened, they stayed in place. [ATTACH=full]230963[/ATTACH] If a magnet of this size and strength gets away from you, it will shatter when it lands. It will also draw blood if your finger is in the way. A technician had one of these underneath the tool tray on his rollaway. It sucked a wrench out of the pocket of his foreman when the man walked too close. There is another effect that I never fully wrapped my mind around. The strongest neodymium magnets are not necessarily the best. It's something to do with demagnetization under certain circumstances. I think it has something to do with open magnetic circuits, possibly during installation. Or maybe at higher temperatures. This looks like a good place to get started designing permanent magnet circuits: [URL]https://www.intemag.com/magnet-design-guide[/URL]. [/QUOTE]
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Electromagnetism
Magnet system efficiency made from neodymium magnets
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