Patent ID: 8890389

Claim:
An electric motor comprising: an inner stator comprising inner magnetic poles arranged along a circumferential direction of the motor; an outer stator comprising outer magnetic poles arranged along the circumferential direction; and a rotor rotatably disposed between the inner and outer stators, the rotor comprising a shaft, a rotor core fixed to the shaft and a winding wound on the rotor core; wherein the rotor core comprises a ring shaped yoke having a plurality of inner teeth extending inwardly and a plurality of outer teeth extending outwardly; and the winding comprises a plurality coils, each coil comprising an inner side received in a corresponding inner slot formed between adjacent inner teeth and an outer side received in a corresponding outer slot formed between adjacent outer teeth, and the inner sides of the coils face the inner magnetic poles and the outer sides of the coils face the outer magnetic poles; wherein the rotor further comprises a bracket comprising a mounting section fixed to the shaft and a connection section extending radially outwardly from the mounting section, the connection section being located at one axial end of and fixed with the rotor core, and wherein the motor further comprises a commutator fixed to the shaft, and a plurality of brushes arranged in sliding contact with the commutator, the winding being electrically connected to the commutator and the brushes being electrically connectable to a power source, the bracket defining a recess and an axial end of the commutator being received in the recess of the bracket.