Axial flow fan

Abstract

The present invention provides an axial flow fan having conductive pins, each of which is configured to electrically connect a coil of a stator and a circuit board, and to hold a film conductor of the coil. In the conductive pin, one end is fixed to an electrical insulator covering a core stack of the stator, and the other end is electrically connected to the circuit board. The conductive pin is a quadrangular prism pin as a basic configuration and has, in at least a part of a portion exposed from the electrical insulator, a reduced diameter portion having no corners.

What is claimed is: 
     
         1 . An axial flow fan comprising:
 a stator having coils of a plurality of phases;   a rotor having a permanent magnet; and   conductive pins each of which is configured to electrically connect the coil and a circuit board and hold a film conductor of the coil,   wherein, in the conductive pin, one end is fixed to an electrical insulator covering a core stack of the stator, and the other end is electrically connected to the circuit board, and   the conductive pin is a prismatic pin as a basic configuration and has, in at least a part of a portion exposed from the electrical insulator, a reduced diameter portion in which no corners of the prismatic pin exist.   
     
     
         2 . The axial flow fan according to  claim 1 , wherein the reduced diameter portion is a portion in which a maximum distance in a diameter direction of the conductive pin other than the reduced diameter portion is reduced. 
     
     
         3 . The axial flow fan according to  claim 2 ,
 wherein the reduced diameter portion has a polygonal shape having an inner diameter more than 90° or a circular shape having no corners.   
     
     
         4 . The axial flow fan according to  claim 1 ,
 wherein the prismatic pin is in a quadrangular prism shape or a triangular prism shape.   
     
     
         5 . The axial flow fan according to  claim 1 ,
 wherein the reduced diameter portion is positioned at a base end of the exposed portion in such a state that the conductive pin is fixed to the electrical insulator.   
     
     
         6 . The axial flow fan according to  claim 1 ,
 wherein the film conductor is held by being wound around the exposed portion of the conductive pin, and   winding of the film conductor is started from a portion other than the reduced diameter portion of the exposed portion and finished at the reduced diameter portion, or alternatively, the winding of the film conductor is started from the reduced diameter portion of the exposed portion and finished at a portion other than the reduced diameter portion.