A flat, permanent magnet wheel motor and drive to have about double the overall efficiency of other motors used or proposed for electric vehicles.
The motor and drive combination is unique in that back emf and surplus power is extracted from non energised poles at all points in the drive cycle.
It is smoother and more efficient than conventional systems, and is aimed at the growing electric and hybrid vehicle market.
The motor exhibits relatively low field breakdown so torque and back EMF are less spiky than usual.
- The motors are flat, multi-poled types optimised for low speeds and high torque
- The permanent magnets are ferrite, making the motors low cost
- High efficiency and smooth running is ensured by using back emf from the non-energised motor windings