Patent ID: 8692430

Claim:
A motor assembling method, comprising: providing a base with a shaft tube extending from the base to an opening end in an axial direction, with the shaft tube having an inner circumferential wall of a constant diameter from the opening end towards the base and an outer circumferential wall, wherein the shaft tube has a thermoplastic positioning portion on the opening end thereof; disposing a shaft tube assembly into the inner circumferential wall of the constant diameter of the shaft tube via the opening end, with the shaft tube assembly having a maximum outer diameter equal to the inner circumferential wall of the constant diameter for slideable receipt therein, with the opening end of the shaft tube extending beyond a top face of the shaft tube assembly in the axial direction; heating the thermoplastic positioning portion by a heating fixture to melt and deform the thermoplastic positioning portion until the opening end of the shaft tube has shrunk to have a reduced diameter smaller than the constant diameter, wherein the shaft tube assembly is held in position in the shaft tube by the reduced diameter after the thermoplastic positioning portion has cooled down and solidified, with an end portion of the outer circumferential wall of the shaft tube at the opening end and beyond the shaft tube assembly having increasing size from the opening end towards the base; coupling an interior passage of a stator unit with the outer circumferential wall of the shaft tube and pressing a pressing potion of the stator unit with the end portion of the shaft tube, with the pressing portion having an increasing size corresponding to the increasing size of the end portion of the outer circumferential wall of the shaft tube; and coupling a rotor with the shaft tube.