A motor assembly comprising: a stator ; a rotor having a rotor shaft and electromagnetically interacting with the stator to be rotated; and an impeller having an impeller body , a plurality of wings formed on the outer face of the impeller body for producing air currents, and a shaft combiner arranged on the impeller body for the rotor shaft to be combined with, and integrally formed with the rotor shaft , wherein the rotor shaft comprises: a plurality of anti-slip grooves formed to correspond to the shaft combiner , and having grooves formed along a direction of the rotation shaft at regular intervals in a circumferential direction, and characterised in that the motor assembly further comprises an adhesive applied onto the plurality of anti-slip grooves , and in that the rotor shaft further comprises an anti-leakage flange formed at an end of the rotor shaft to be adjacent to the plurality of anti-slip grooves configured to prevent the adhesive applied onto the plurality of anti-slip grooves from leaking out, and wherein the anti-leakage flange comprises an anti-leakage groove formed to be sunken along the circumference of the rotor shaft on the inside of the anti-leakage flange to contain the adhesive leaking out. a stator ; a rotor having a rotor shaft and electromagnetically interacting with the stator to be rotated; and an impeller having an impeller body , a plurality of wings formed on the outer face of the impeller body for producing air currents, and a shaft combiner arranged on the impeller body for the rotor shaft to be combined with, and integrally formed with the rotor shaft , wherein the rotor shaft comprises: a plurality of anti-slip grooves formed to correspond to the shaft combiner , and having grooves formed along a direction of the rotation shaft at regular intervals in a circumferential direction, and characterised in that the motor assembly further comprises an adhesive applied onto the plurality of anti-slip grooves , and in that the rotor shaft further comprises an anti-leakage flange formed at an end of the rotor shaft to be adjacent to the plurality of anti-slip grooves configured to prevent the adhesive applied onto the plurality of anti-slip grooves from leaking out, and wherein the anti-leakage flange comprises an anti-leakage groove formed to be sunken along the circumference of the rotor shaft on the inside of the anti-leakage flange to contain the adhesive leaking out. a plurality of anti-slip grooves formed to correspond to the shaft combiner , and having grooves formed along a direction of the rotation shaft at regular intervals in a circumferential direction, and characterised in that the motor assembly further comprises an adhesive applied onto the plurality of anti-slip grooves , and in that the rotor shaft further comprises an anti-leakage flange formed at an end of the rotor shaft to be adjacent to the plurality of anti-slip grooves configured to prevent the adhesive applied onto the plurality of anti-slip grooves from leaking out, and wherein the anti-leakage flange comprises an anti-leakage groove formed to be sunken along the circumference of the rotor shaft on the inside of the anti-leakage flange to contain the adhesive leaking out. <EOS>