A fully-sealed brushless motor includes a motor casing body, a motor rotor, a stator core, a moving impeller, an air guide enclosure, a circuit board, and a circuit board end cover. The motor casing body includes upper and lower aluminum casing bodies connected together. The motor rotor is enclosed by the aluminum casing bodies and transmits heat to the aluminum casing bodies by the stator core. A rotating shaft of the motor rotor extends out from the lower aluminum casing body. The moving impeller is installed at the rotating shaft. The air guide enclosure is installed on the lower aluminum casing body at an outer side of the moving impeller. A gas flow discharged by the moving impeller is blown towards the motor casing body by the air guide enclosure. The circuit board is enclosed by the circuit board end cover and upper aluminum casing body.

A fully-sealed brushless motor includes a motor casing body, a motor rotor, a stator core, a moving impeller, an air guide enclosure, a circuit board, and a circuit board end cover. The motor casing body includes upper and lower aluminum casing bodies connected together. The motor rotor is enclosed by the aluminum casing bodies and transmits heat to the aluminum casing bodies by the stator core. A rotating shaft of the motor rotor extends out from the lower aluminum casing body. The moving impeller is installed at the rotating shaft. The air guide enclosure is installed on the lower aluminum casing body at an outer side of the moving impeller. A gas flow discharged by the moving impeller is blown towards the motor casing body by the air guide enclosure. The circuit board is enclosed by the circuit board end cover and upper aluminum casing body.

A stator includes a stator core having an annular shape surrounding a center axis extending in an axial direction, a plurality of coil portions, a circuit board, and a coating portion having electrical insulating properties. The stator core includes a slot. A plurality of the slots extend through the stator core in the axial direction and are arranged in a circumferential direction. The plurality of coil portions are respectively provided in the plurality of slots. The circuit board is on one side of the stator core in the axial direction and electrically connected to a lead wire drawn from the plurality of coil portions. The coating portion coats at least the coil portions. The circuit board includes a first through-hole extending in the axial direction. At least a portion of the first through-hole overlaps the stator core as viewed in the axial direction.

A stator includes a stator core having an annular shape surrounding a center axis extending in an axial direction, a plurality of coil portions, a circuit board, and a coating portion having electrical insulating properties. The stator core includes a slot. A plurality of the slots extend through the stator core in the axial direction and are arranged in a circumferential direction. The plurality of coil portions are respectively provided in the plurality of slots. The circuit board is on one side of the stator core in the axial direction and electrically connected to a lead wire drawn from the plurality of coil portions. The coating portion coats at least the coil portions. The circuit board includes a first through-hole extending in the axial direction. At least a portion of the first through-hole overlaps the stator core as viewed in the axial direction.