| 主权项 |
1. A motor comprising:
a bearing portion; a shaft extending along a central axis extending in a vertical direction, and rotatably supported by the bearing portion; a rotor magnet configured to rotate together with the shaft; an armature located radially outside the rotor magnet; a circuit board held on an axially lower side of the armature, and configured to supply electricity to the armature; a bracket including a cover portion configured to support the bearing portion, and a cylindrical portion extending downward from a radially outer edge of the cover portion, and including an inner circumferential surface supported by the armature; and an impeller including a plurality of blades arranged in a circumferential direction, and fixed to the shaft between the cover portion and the armature; wherein the cover portion includes at least one cover portion through hole arranged to axially overlap with the blades; the cylindrical portion includes at least one cylindrical portion through hole arranged to radially overlap with the blades; and each blade is a pitched blade including an upper edge and a lower edge arranged at different circumferential positions. |
