Micro cooling fan

• US 8,684,709 B2
• Filed: 08/09/2010
• Issued: 04/01/2014
• Est. Priority Date: 05/28/2010
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Huang, Chung-Chun, Wang, Chien-Chang, Liang, Kun-Yi
• Primary Examiner(s): Bertheaud, Peter J
• Assistant Examiner(s): Plakkoottam, Dominick L
• Application Number:
  US12/853,012
• Publication Number:
  US 20110290456A1
• Time in Patent Office: 1,331 Days
• Field of Search: 417/44.1, 417/353, 417/354, 417/423.1, 417/423.7, 310/68.B, 310/71, 310/156.06, 310/67.R
• US Class Current: 417/423.7
• CPC Class Codes: F04D 25/0653 the motor having a plane air gap, e.g. disc-type
• CPC Class Codes: F04D 25/0693 Details or arrangements of the wiring
• CPC Class Codes: F04D 29/601 specially adapted for elastic fluid pumps
• CPC Class Codes: H05K 7/20172 Fan mounting or fan specifications

Abstract

A micro cooling fan includes a housing, a fan wheel, and a main circuit board. The main circuit board has a stator and a driving circuit. The stator is electrically connected to the driving circuit. The stator is disposed on a first inner surface, and the driving circuit is disposed on a first outer surface, so that the housing and the driving circuit of the micro fan motor form an integral structure. The first outer surface is opposite to the first inner surface, or the first outer surface is located on a side surface of the housing. Therefore, by disposing the driving circuit on the first outer surface, the wind resistance of the fan blades is reduced, and the air volume of the micro cooling fan is increased accordingly, so that the cooling effect of the micro cooling fan is improved.

Claims

1. A micro cooling fan, comprising:

a housing, having a wall body defining an accommodation space, a first inner surface at a first side of the wall body, a first outer surface which is physically a part of a second side of the wall body, with the second side opposite to the first side with respect to the wall body, the first outer surface comprises four sides, and the first inner surface comprises an inner bottom surface and an inner annular wall surface surrounding the inner bottom surface;

a fan wheel, having a plurality of fan blades and disposed in the accommodation space to which the first inner surface faces; and

a main circuit board, comprising a first circuit board and a second circuit board, wherein a stator is disposed on the first circuit board, a driving circuit is disposed on the second circuit board, the stator is electrically connected to the driving circuit, the first circuit board is disposed on the inner bottom surface, the second circuit board comprises a first plate portion and a second plate portion perpendicular to the first plate portion, and the first plate portion of the second circuit board covers the entire width of one side of the first outer surface;

wherein the housing further has an opening and a rib extending along the radial direction of the fan wheel, the first circuit board has a connecting board, the opening is a position for placing the connecting board such that the connecting board connects the first circuit board and the second circuit board, the connecting board is disposed on the rib, and the width of the connecting board is smaller than or equal to the width of the rib.

2. The micro cooling fan according to claim 1, wherein the stator is a set of stator coils.

3. The micro cooling fan according to claim 1, wherein the stator is three sets of stator coils.

4. The micro cooling fan according to claim 1, wherein the main circuit board is a combined circuit board.

5. The micro cooling fan according to claim 1, wherein the driving circuit comprises a connecting terminal and a driving element.

6. The micro cooling fan according to claim 1, wherein a magnetic block is disposed between the first inner bottom surface and the first circuit board, the stator and the magnetic block are disposed on the opposite sides of the first circuit board respectively and two opposite surfaces of the magnetic block are directly contacted with the first inner bottom surface and the first circuit board respectively.

7. The micro cooling fan according to claim 1, wherein the area of the stator and the fan wheel is smaller than or equal to the area of the first inner surface.

8. The micro cooling fan according to claim 1, wherein the driving circuit has only one driving element disposed thereon.