As the third generation of rare earth permanent magnets, Neodymium magnets are the most powerful commercially produced magnets. Neodymium arc magnet, also known as Neodymium curved magnet, is a unique shape of Neodymium magnet. Almost all of the Neodymium arc magnet is used for both rotor and stator in permanent magnet (PM) motors, generators, or magnetic couplings.