Motor including housing structure with through holes

摘要

A motor includes an impeller including a plurality of blades arranged in a circumferential direction and fixed to a shaft between a cover portion and an armature. The cover portion includes at least one cover portion through hole arranged to axially overlap with the blades. A cylindrical portion includes at least one cylindrical portion through hole arranged to radially overlap with the blades.

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 bottom portion and a cover portion both 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 at least one cover portion through hole defining an inlet permitting air to enter into the motor; the bottom portion includes at least one bottom portion through hole defining a first outlet permitting air to exit the motor; the cylindrical portion includes at least one cylindrical portion through hole arranged to radially overlap with the blades, the at least one cylindrical portion through hole defining a second outlet permitting air to exit the motor; each blade is a pitched blade including an upper edge and a lower edge arranged at different circumferential positions; the circuit board includes portions directly opposed to a rotor core which supports the rotor magnet without any intervening member being provided between the circuit board and the rotor core; and the circuit board includes three equidistant projections which connect the circuit board to an insulator of the armature at three points.