giving the rotor a little boost. The difference here is that rather than low-friction sapphire bearings, this motor uses zero-friction magnetic levitation using pyrolyzed graphite discs.

That little single-rotor powerplant quickly evolved into the more typical two-rotor design one might see in a Mazda RX-7, for example. Then came a three-rotor, which first appeared in the Eunos ...

Conti will package its brake components with a patented dual-rotor, radial-flux motor, supplied by DeepDrive, to drive the wheels. The technology will be road-ready soon, the partners say ...