Patent ID: 7795775

Claim:
A motor stator comprising: at least one claw-pole assembly for coils wound thereon, the at least one claw-pole assembly comprising a pair of yokes facing towards each other, each of the yokes being ring-shaped, a plurality of pole teeth extending from each of the yokes, the pole teeth of the two yokes being intermeshed with each other with a gap defined between two adjacent pole teeth, and being arranged in alternating fashion along a circumferential direction of the yokes to cooperatively form a cylinder-shaped sidewall for the coils wound therearound, the sidewall defining an inner space for receiving a rotor therein; an integral fixing structure made of plastic material by insert molding comprising a connecting portion contained in the gaps between the pole teeth, a base formed at an end of the inner space, and a tube extending from the base into the inner space, wherein the connecting portion, the base and the tube are monolithic, and the tube comprises an upper portion and a lower portion with an inner diameter larger than that of the upper portion; and a sleeve bearing being fixedly embedded in the lower portion of the tube during the process of insert molding the fixing structure, the sleeve bearing defining a bearing hole for rotatably supporting a shaft of the rotor; wherein an outer surface of the sleeve bearing is step-shaped, an annular groove being defined in each step of the outer surface of the sleeve bearing, the lower portion of the tube having a step-shaped inner surface corresponding to the outer surface of the sleeve bearing, an annular flange being formed on each step of the inner surface of the lower portion of the tube and being received in a corresponding groove of the sleeve bearing.