Patent ID: 8749192

Claim:
An electric motor comprising a stator having two coil sets arranged to produce a magnetic field of the motor, each coil set comprising a plurality of coil sub-sets, wherein the two coil sets are without an electrical connection therebetween so that current flow in the coil sub-sets of one coil set is independent of current flow in the coil sub-sets of the other coil set; and first and second control device mounted on the stator within a casing of the motor, 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, wherein each control device includes a plurality of inverter switches and control logic for controlling the operation of the plurality of inverter switches for controlling 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 on the stator adjacent to the respective plurality of coil sub-sets.