Motor and air blowing apparatus including the same

Abstract

A motor includes a body portion, a circuit board, and a guide portion. The body portion includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction. The circuit board is disposed below the body portion and has an electronic component mounted thereon. The guide portion guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion. At least a part of the guide portion faces the electronic component in the radial direction.

What is claimed is: 
     
         1 . A motor comprising:
 a body portion that includes a rotor rotating around a center axis extending in a top-bottom direction and having a magnet, and a stator facing the magnet in a radial direction;   a circuit board which is disposed below the body portion and on which an electronic component is mounted; and   a guide portion that guides an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion, wherein   at least a part of the guide portion faces the electronic component in the radial direction.   
     
     
         2 . The motor according to  claim 1 , further comprising:
 a bracket that is attached to a lower portion of the stator, wherein   the bracket includes
 a holding portion that is disposed at a lower portion of the body portion and holds the circuit board, 
 the guide portion that is disposed outside in the radial direction and below the holding portion, and 
 a connecting portion that connects the holding portion and the guide portion to each other, and 
   at least an upper portion of a surface inside the guide portion in the radial direction is inclined inwardly in the radial direction as the upper portion extends downward.   
     
     
         3 . The motor according to  claim 2 , wherein
 the guide portion is disposed outside the circuit board in the radial direction.   
     
     
         4 . The motor according to  claim 2 , wherein
 the guide portion extends in a circumferential direction and a plurality of connecting portions that connect the holding portion and the guide portion to each other are provided in the circumferential direction.   
     
     
         5 . The motor according to  claim 2 , wherein
 the connecting portion extends outside in the radial direction and downward from an outer peripheral end of the holding portion.   
     
     
         6 . The motor according to  claim 2 , wherein
 the holding portion includes a cylindrical portion that covers at least a part of an outside surface of the body portion above the circuit board,   the electronic component is mounted on a lower surface of the circuit board, and   a cutout portion is provided at a lower end of the cylindrical portion.   
     
     
         7 . The motor according to  claim 6 , wherein
 at least a part of an outer edge portion of the circuit board protrudes further outside in the radial direction than an outer edge of the cylindrical portion when viewed in an axial direction.   
     
     
         8 . The motor according to  claim 6 , wherein
 the cutout portion is disposed at a position in a circumferential direction same as a position of at least a part of the guide portion.   
     
     
         9 . The motor according to  claim 2 , wherein
 the bracket includes a locking portion that is locked to an inner wall of a duct through which an airflow circulates, and   the locking portion is positioned further outside than the guide portion in the radial direction.   
     
     
         10 . The motor according to  claim 2 , wherein
 a plurality of guide portions that guide an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion are provided side by side in the circumferential direction.   
     
     
         11 . The motor according to  claim 10 , wherein
 a gap between adjacent guide portions among the plurality of guide portions penetrates in the axial direction.   
     
     
         12 . The motor according to  claim 2 , wherein
 the guide portion has an arc shape the center of which is the center axis when viewed in the axial direction.   
     
     
         13 . The motor according to  claim 10 , wherein
 the electronic component and the guide portion are disposed partially in a predetermined region in the circumferential direction.   
     
     
         14 . The motor according to  claim 2 , wherein
 an inclination angle of at least an upper portion of a surface inside the guide portion in the radial direction is 60 degrees or less with respect to the center axis.   
     
     
         15 . The motor according to  claim 1 , further comprising:
 a housing portion in a cylindrical shape in which the body portion is accommodated and which forms an air passage, through which the airflow circulates, in a gap between the housing portion and the body portion, wherein   the guide portion is provided on an inside surface of the housing portion and is disposed further outside in the radial direction and further below than the body portion, and   at least an upper portion of an inside surface of the guide portion in the radial direction is inclined inwardly in the radial direction as the upper portion extends downward.   
     
     
         16 . The motor according to  claim 15 , further comprising:
 a bracket that is attached to a lower portion of the stator, wherein   the bracket includes a holding portion that is disposed at a lower portion of the body portion and holds the circuit board,   the holding portion includes a cylindrical portion that covers at least a part of an outside surface of the body portion above the circuit board,   the guide portion is disposed outside in the radial direction and below the holding portion,   the electronic component is mounted on a lower surface of the circuit board, and   a cutout portion is provided at a lower end of the cylindrical portion.   
     
     
         17 . The motor according to  claim 16 , wherein
 at least a part of an outer edge portion of the circuit board protrudes further outside in the radial direction than an outer edge of the cylindrical portion when viewed in an axial direction.   
     
     
         18 . The motor according to  claim 16 , wherein
 the cutout portion is disposed at a position in a circumferential direction same as a position of at least a part of the guide portion.   
     
     
         19 . The motor according to  claim 10 , wherein
 a plurality of guide portions that guide an airflow circulating downward in the top-bottom direction toward inside in the radial direction below the body portion are provided side by side in the circumferential direction.   
     
     
         20 . The motor according to  claim 19 , wherein
 a gap between adjacent guide portions among the plurality of guide portions penetrates in the axial direction.   
     
     
         21 . The motor according to  claim 10 , wherein
 the guide portion has an arc shape the center of which is the center axis when viewed in the axial direction.   
     
     
         22 . The motor according to  claim 19 , wherein
 the electronic component and the guide portion are disposed partially in a predetermined region in the circumferential direction.   
     
     
         23 . The motor according to  claim 10 , wherein
 an inclination angle of at least an upper portion of a surface inside the guide portion in the radial direction is  60  degrees or less with respect to the center axis.   
     
     
         24 . The motor according to  claim 1 , wherein
 the electronic component is mounted to extend in the axial direction and faces the guide portion in the radial direction.   
     
     
         25 . The motor according to  claim 1 , wherein
 the electronic component includes an IC, and   the IC is mounted to extend in the axial direction and faces the guide portion in the radial direction.   
     
     
         26 . An air blowing apparatus comprising:
 the motor according to  claim 1 ; and   an impeller that is provided in the rotor and rotates around the center axis by driving the motor, wherein   the impeller rotates to suck air from an upper side and exhaust the air to a lower side.