Fan motor with anti-dirt sticking function and apparatus having fan motor

Abstract

A fan motor including a stator; a rotor having a cylindrical part arranged around the stator and a plurality of blades sticking out from an outer periphery of the cylindrical part to a radial direction, the rotor rotating about an axial line to blow a gas; and a housing having a disk part arranged at a side of the stator, a shroud part arranged around the blades, and a plurality of stays extending from an outer circumferential edge portion of the disk part to the radial direction to connect the disk part and the shroud part beside the blades. The stays are arranged at an upstream side from the blades in a blowing direction of the gas.

1 . A fan motor comprising:
 a stator having a coil;   a rotor having a cylindrical part arranged around the stator and a plurality of blades sticking out from an outer periphery of the cylindrical part to a radial direction, the plurality of blades being arranged in a circumferential direction, the rotor rotating about an axial line to blow a gas in parallel to the axial line through the blades; and   a housing having a disk part arranged at a side of the stator, a shroud part arranged around the blades, and a plurality of stays extending from an outer circumferential edge portion of the disk part to the radial direction to connect the disk part and the shroud part beside the blades, the plurality of stays being arranged in the circumferential direction,   wherein the stays are arranged at an upstream side from the blades in a blowing direction of the gas.   
     
     
         2 . The fan motor according to  claim 1 , further comprising a printed circuit board on which an electronic device controlling a current supplied to the coil is mounted,
 wherein the disk part has a holding part holding the printed circuit board.   
     
     
         3 . The fan motor according to  claim 2 , wherein at least one of the stator and the printed circuit board is surrounded by a resin material. 
     
     
         4 . The fan motor according to  claim 1 , wherein at least one of the disk part and the stays have a slanted part slanted to an opposite side of the blowing direction of the gas toward an outside in the radial direction. 
     
     
         5 . The fan motor according to  claim 1 , wherein surfaces at upstream sides of the stays are slanted with respect to the axial line. 
     
     
         6 . An apparatus having a fan motor, comprising:
 a fan motor according to  claim 1 ;   a passage-forming member forming a passage through which cooling air generated by driving of the fan motor passes; and   a cooled member cooled by the cooling air passing through the passage.   
     
     
         7 . The apparatus having a fan motor according to  claim 6 , wherein the cooled member is an electronic device for controlling a drive motor of a robot or machine tool. 
     
     
         8 . The apparatus having a fan motor according to  claim 6 , wherein the fan motor is arranged with the axial line facing a vertical direction and with the stays facing downward.