In Mahle’s Contact-Free Electric Motor, Power Reaches the Rotor Wirelessly
14th May 2021
Today Mahle, a German auto parts company, unveiled a motor that’s free of both rare earths and of physical contact. Power is beamed into the rotor wirelessly, through induction, by a coil carrying alternating current. This induces a current in the receiving electrode, inside the rotor, which energizes the copper windings there to produce an electromagnetic field.
I’m sure it still has bearings, and those will eventually wear out.