“There are no contacts to transmit electricity, no abrasion, no dust formation, no mechanical wear,” Martin Berger, Mahle’s head of research, said Wednesday, in an online press conference. “Also I have to say, if one must service a non-magnetized rotor, it’s not difficult to exchange the rotor.” That means there’s practically nothing that can wear out. This induces a current in the receiving electrode, inside the rotor, which energizes the copper windings there to produce an electromagnetic field. Power is beamed into the rotor wirelessly, through induction, by a coil carrying alternating current. Today Mahle, a German auto parts company, unveiled a motor that’s free of both rare earths and of physical contact. One problem: Designs that put copper windings in the rotor have to transmit electricity to a moving target, and the point of contact-the slip ring-is subject to wear and tear. These alternative motors turn the rotor using electromagnetic force alone we’ve covered more than one such motor recently. It’s also partly because the mining is done in China, a formidable automotive competitor. ![]() Automakers outside China are scrambling to develop electric motor designs that use no permanent magnets, partly because the magnets require rare earths, and mining rare earths causes pollution.
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