Patent ID: 7884523

Claim:
A brushless DC motor comprising: a base having a shaft seat; a stator having a coil module disposed on the base; a rotor comprising a body providing an inner surface opposite to the coil module of the stator, a permanent magnet mounting on the inner surface of the body, and a shaft coupling with a center of the inner surface with one end and revolvably connecting to the shaft seat with another end, with a gap being axially formed between the permanent magnet and the coil module; and a leak flux absorber disposed around the coil module and adjacent to or partially in the gap, wherein the leak flux absorber comprises an outer ring and an inner ring, wherein a plurality of connecting members links the outer and inner rings while a plurality of through holes is arranged between said outer and inner rings, with each of the plurality of through holes being arranged between any adjacent two of the plurality of connecting members, with the outer ring enclosing the coil module and the inner ring being surrounded by the coil module, with a plurality of end faces of the coil module facing the permanent magnet through the plurality of through holes.