Two great minds in permanent-magnet-free motor design are fusing their know-how to create an even more capable inductive electric motor. Mahle and Valeo have teamed up to introduce what they call the Inner Brushless Electrical Excitation (iBEE) system, a form of e-machine that eliminates the need…
I think one of the interesting parts is, if I understand it correctly, wirelessly transmitting excitation current for the rotor. Traditionally this is done with some mechanical coupling like brushes or slip rings.