A motor's stator unit comprising: a base having a 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 an enameled copper wire is wound around a predetermined part of the insulation sleeve unit to form the coil unit, wherein an engagement hole of the insulation sleeve unit has a minimal diameter that is slightly smaller than an outer diameter of the shaft tube, and wherein the stator is press fitted around an outer circumferential wall of the shaft tube via the insulation sleeve unit, wherein the insulation sleeve unit comprises an upper insulation sleeve and a lower insulation sleeve, wherein the engagement hole of the insulation sleeve unit comprises a first engagement hole and a second engagement hole, wherein the upper insulation sleeve has an inner circumferential wall forming the first engagement hole, wherein the lower insulation sleeve has an inner circumferential wall forming the second engagement hole, wherein the first engagement hole has a diameter that is slightly smaller than the outer diameter of the shaft tube, wherein the stator is press fitted around the outer circumferential wall of the shaft tube via the upper insulation sleeve, wherein the upper insulation sleeve is remote in an axial direction from the base, wherein the lower insulation sleeve is adjacent to the base in the axial direction, wherein the silicon steel plate unit and the insulation sleeve unit are stacked together to align the through-hole with the first and second engagement holes (221a, 221b), wherein the motor's stator unit is characterized in that a first buffering member is arranged between the upper insulation sleeve of the insulation sleeve unit and the silicon steel plate unit, or between the lower insulation sleeve of the insulation sleeve unit and the silicon steel plate unit. a base having a 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 an enameled copper wire is wound around a predetermined part of the insulation sleeve unit to form the coil unit, wherein an engagement hole of the insulation sleeve unit has a minimal diameter that is slightly smaller than an outer diameter of the shaft tube, and wherein the stator is press fitted around an outer circumferential wall of the shaft tube via the insulation sleeve unit, wherein the insulation sleeve unit comprises an upper insulation sleeve and a lower insulation sleeve, wherein the engagement hole of the insulation sleeve unit comprises a first engagement hole and a second engagement hole, wherein the upper insulation sleeve has an inner circumferential wall forming the first engagement hole, wherein the lower insulation sleeve has an inner circumferential wall forming the second engagement hole, wherein the first engagement hole has a diameter that is slightly smaller than the outer diameter of the shaft tube, wherein the stator is press fitted around the outer circumferential wall of the shaft tube via the upper insulation sleeve, wherein the upper insulation sleeve is remote in an axial direction from the base, wherein the lower insulation sleeve is adjacent to the base in the axial direction, wherein the silicon steel plate unit and the insulation sleeve unit are stacked together to align the through-hole with the first and second engagement holes (221a, 221b), wherein the motor's stator unit is characterized in that a first buffering member is arranged between the upper insulation sleeve of the insulation sleeve unit and the silicon steel plate unit, or between the lower insulation sleeve of the insulation sleeve unit and the silicon steel plate unit.