Abstract: An electric motor with a stator having two coil sets arranged to produce a magnetic field of the motor, each coil set having a plurality of coil sub-sets; and two control devices, wherein the first control device is coupled to the plurality of coil sub-sets for the first coil set and the second control device is coupled to the plurality of coil sub-sets for the second coil set and each control device is arranged to control current in the respective plurality of coil sub-sets to generate a magnetic field in each coil sub-set to have a substantially different magnetic phase to the other one or more coil sub-sets in the respective coil set; and wherein the first control device and the second control device are mounted adjacent to the stator.

Abstract: An electric motor or generator having a stator with stator teeth for mounting electrical coils and a rotor, wherein the stator has a first surface that is parallel to an axis of rotation of the rotor and is axially separated from the stator teeth and the rotor has a second surface that is formed in substantially the same axial position as the stator s first surface, wherein material is mounted on the first surface or the second surface that has a lower frictional coefficient than the first surface or second surface.