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Thomas Edison, who had the first patent on an eddy current device in 1889, did not have rare earth permanent magnet material available during his lifetime, nor were there aluminum cans to recover. The inner part is a rotor with strips of permanent magnet material (neodymium-iron-boron) mounted lengthwise. Advances in permanent magnet material and electronic drive technology have made permanent magnet motors an attractive alternative for both submarine and surface warship applications. |
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