Base structure for cooling fan

A base structure for cooling fan, comprising:

• a seat having an inner side served as a supporting surface and a bearing cup being forward extended from a predetermined position on the supporting surface, wherein the seat is provided with a plurality of holes at predetermined positions on the supporting surface;
• a circuit board being arranged on a top of the supporting surface, and having a first side and an opposite second side;
• the first side of the circuit board being attached to the top of the supporting surface, and the second side having a plurality of electronic elements provided thereon;
• a gum-backed insulating sheet provided between the first side of the circuit board and the supporting surface of the seat, wherein the circuit board is provided on the first side with additional electronic elements, which are correspondingly located in the holes on the supporting surface;
• and wherein the circuit board is provided on the first side with a plurality of connection wires;
• and the connecting wires having one ends electrically connected to the circuit board and another ends extended through the holes on the supporting surface to an outer side of the seat, wherein portions of the gum-backed insulating sheet corresponding to the holes on the supporting surface are removed to allow the additional electronic elements and the connection wires to extend therethrough into the holes on the supporting surface;
• and
• a motor assembly including a plurality of silicon steel plates;
• and the motor assembly being fitted around an outer side of the bearing cup to locate on the circuit board and above the electronic elements.