A permanent magnet is made from ferromagnetic materials, and it creates its own magnetic field and retains magnetic properties. Permanent magnet exhibits magnetic properties even if is removed from a magnetic field. Permanent magnet can be broadly classified into rare earth, ferrite, aluminum-nickel-cobalt (Alnico), and other magnets. Permanent magnet motor is manufactured with permanent magnets in rotors. Rare earth magnets, made from rare earth metals, are used as the permanent magnets in this motor. Unlike electromagnet, permanent magnet does not require continuous electric energy to mainta...more >>
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