A motor's stator unit comprising: a base having a shaft tube, wherein the shaft tube has an opening end at the top of the shaft tube, the one end of the shaft tube being adjacent to the outer axial end of the base, the opening end being at the other end of the shaft tube; and a stator having a silicon steel plate unit, an insulation sleeve unit and a coil unit, wherein the silicon steel plate unit has an inner circumferential wall forming a through-hole, wherein the outer circumferential wall of the shaft tube is spaced from the inner circumferential wall of the silicon steel plate unit by a gap, wherein the insulation sleeve unit has an engagement hole, wherein the silicon steel plate unit and the insulation sleeve unit are stacked together, wherein the through-hole and the engagement hole are aligned with each other to allow the shaft tube to extend through the through-hole and the engagement hole, wherein an enameled copper wire is wound around a predetermined part of the insulation sleeve unit to form the coil unit, wherein the insulation sleeve unit of the stator is press fitted around an outer circumferential wall of the shaft tube via at least one buffering member, wherein the at least one buffering member is arranged between the insulation sleeve unit and the shaft tube, wherein the motor's stator unit is characterized in that: one of the at least one buffering member is positioned by a positioning ring coupled with the shaft tube, an expansion portion formed at the opening end of the shaft tube, or an engagement portion formed at the opening end of the shaft tube, wherein when the one of the at least one buffering member is positioned by the positioning ring, the one of the at least one buffering member is sandwiched between the positioning ring and the silicon steel plate unit, and the positioning ring is fitted around the shaft tube by press fitting, wherein when the one of the at least one buffering member is positioned by the expansion portion, the one of the at least one buffering member is sandwiched between the expansion portion and the silicon steel plate unit, wherein when the one of the at least one buffering member is positioned by the engagement portion, the one of the at least one buffering member is sandwiched between the engaging portion and the silicon steel plate unit. a base having a shaft tube, wherein the shaft tube has an opening end at the top of the shaft tube, the one end of the shaft tube being adjacent to the outer axial end of the base, the opening end being at the other end of the shaft tube; and a stator having a silicon steel plate unit, an insulation sleeve unit and a coil unit, wherein the silicon steel plate unit has an inner circumferential wall forming a through-hole, wherein the outer circumferential wall of the shaft tube is spaced from the inner circumferential wall of the silicon steel plate unit by a gap, wherein the insulation sleeve unit has an engagement hole, wherein the silicon steel plate unit and the insulation sleeve unit are stacked together, wherein the through-hole and the engagement hole are aligned with each other to allow the shaft tube to extend through the through-hole and the engagement hole, wherein an enameled copper wire is wound around a predetermined part of the insulation sleeve unit to form the coil unit, wherein the insulation sleeve unit of the stator is press fitted around an outer circumferential wall of the shaft tube via at least one buffering member, wherein the at least one buffering member is arranged between the insulation sleeve unit and the shaft tube, wherein the motor's stator unit is characterized in that: one of the at least one buffering member is positioned by a positioning ring coupled with the shaft tube, an expansion portion formed at the opening end of the shaft tube, or an engagement portion formed at the opening end of the shaft tube, wherein when the one of the at least one buffering member is positioned by the positioning ring, the one of the at least one buffering member is sandwiched between the positioning ring and the silicon steel plate unit, and the positioning ring is fitted around the shaft tube by press fitting, wherein when the one of the at least one buffering member is positioned by the expansion portion, the one of the at least one buffering member is sandwiched between the expansion portion and the silicon steel plate unit, wherein when the one of the at least one buffering member is positioned by the engagement portion, the one of the at least one buffering member is sandwiched between the engaging portion and the silicon steel plate unit. one of the at least one buffering member is positioned by a positioning ring coupled with the shaft tube, an expansion portion formed at the opening end of the shaft tube, or an engagement portion formed at the opening end of the shaft tube, wherein when the one of the at least one buffering member is positioned by the positioning ring, the one of the at least one buffering member is sandwiched between the positioning ring and the silicon steel plate unit, and the positioning ring is fitted around the shaft tube by press fitting, wherein when the one of the at least one buffering member is positioned by the expansion portion, the one of the at least one buffering member is sandwiched between the expansion portion and the silicon steel plate unit, wherein when the one of the at least one buffering member is positioned by the engagement portion, the one of the at least one buffering member is sandwiched between the engaging portion and the silicon steel plate unit.