Abstract: A centrifugal fan includes a water outlet connecting an interior and an exterior of a housing at a position closer to a radially inner side than an impeller such that liquid at a bottom of the housing is able to be discharged quickly, and accumulation of the liquid is avoided, to ensure normal operation of the centrifugal fan.

Abstract: A motor includes a stationary portion and a rotary portion. The stationary portion includes an armature, a circuit board below the armature, and a base portion. The base portion includes a bearing holder and a radial gap is defined between the circuit board and a wall portion. The circuit board includes a through-hole passing through the circuit board, and at least one exhaust hole passing through the circuit board in an axial direction. A filler material is on upper and lower sides of the circuit board. The radial gap, a first exhaust hole extending in a radial direction, and a second exhaust hole extending in a circumferential direction from the first exhaust hole communicate with each other through an axial space between a lower surface and an upper surface of the base portion.

Abstract: A centrifugal fan includes a water outlet connecting an interior and an exterior of a housing at a position closer to a radially inner side than an impeller such that liquid at a bottom of the housing is able to be discharged quickly, and accumulation of the liquid is avoided, to ensure normal operation of the centrifugal fan.

Abstract: A fan includes a motor portion having a shaft which rotates by taking a central axis as a center, an impeller portion configured at a side of the motor portion along the axial direction and connected with the shaft, and an upper cover portion configured at a radial outside of the impeller portion and in which the impeller portion is accommodated, the upper cover portion including an outside air guide wall portion located at a radial outside of the impeller portion, an inside air guide wall portion located at a radial inside of the outside air guide wall portion and having an air suction port which penetrates in an axial direction, and a plurality of connecting portions connected with the outside air guide wall portion and the inside air guide wall portion, characterized in that the impeller portion has a side wall portion which rotates by taking a central axis as a center, an upper wall portion located at a side of the side wall portion along the axial direction and extending along a radial direction, a plura

Abstract: A motor includes a stationary portion, and a rotary portion having a center axis, and rotatably supported with respect to the stationary portion so as to rotate about the center axis. The stationary portion includes an armature, a circuit board arranged below the armature, and a base portion configured to support the armature and the circuit board. The armature includes a core, a coil wound around the core, and a coil end portion extending from the coil, and connected to the circuit board. The base portion includes a bearing holder, a central tower portion configured to support the bearing holder, and a wall portion surrounding the circuit board at a radial outer side such that a radial gap is defined between the circuit board and the wall portion. The circuit board includes a through-hole passing through the circuit board in an axial direction at the center axis, and at least one exhaust hole passing through the circuit board in the axial direction.

Abstract: A motor includes a stationary portion and a rotary portion. The stationary portion includes an armature, a circuit board, and a base portion. The base portion includes a bearing holder, a central tower portion configured to support the bearing holder and a wall portion which surrounds the circuit board at a radial outer side such that a radial gap is defined between the circuit board and the wall portion. The circuit board includes a through-hole defined at a center thereof, and the central tower portion supports a periphery of the through-hole. Filler material is filled at upper and lower sides of the circuit board, and the circuit board includes at least one exhaust hole. The radial gap and the at least one exhaust hole communicate with each other through an axial space between a lower surface of the circuit board and an upper surface of the base portion.