Interesting idea, do away with rare earth magnets so vehicle price isn't tied to the commodities price and then instead of an old induction motor like Tesla, power the rotor via brushes and achieve a motor with adjustable BEMF. The extra thermal load from the rotor electromagnet is well made up by being able to turn down the magnet at light loads and at high speeds. Quite clever really. Can't wait till people start crashing these
BMW's fifth-generation electric motor combines an old-school sensibility with high-tech EV technology to improve efficiency without rare earth minerals.