Patent ID: 8167582

Claim:
A fan assembly, comprising: a rotation shaft; a rotor coupled to the rotation shaft; a stator disposed inside the rotor; and a fan including a hub having a receiving space therein and a plurality of blades disposed around a circumference of the hub, and coupled to the rotation shaft such that the rotor is spaced from an inner surface of the hub in axial and radial directions, wherein the rotor comprises a frame having one end thereof open, and a permanent magnet disposed inside the frame, wherein an inner diameter of the hub is larger than an outer diameter of the frame such that a vibration isolation space is provided between the frame and the hub, wherein a protruding collar portion protrudes outwardly in an axial direction and is provided at a closed end of the frame, and an insertion bore that receives the protruding collar portion therein is provided inside the hub, and wherein the protruding collar portion is configured to have a longer length in the axial direction compared to a length in the axial direction of the insertion bore so as to secure the vibration isolation space by spacing the frame from an inner surface of the hub.