A blower apparatus includes a casing that houses a first impeller, a first motor, a first circuit board, a second impeller, a second motor, and a second circuit board, a motor housing integrally provided with the casing, a first housing that supports the first motor, and a second housing that supports the second motor. The first housing or the second housing includes a first recessed portion into which a mounted component on the first circuit board is inserted from a first side in the axial direction, and a second recessed portion into which a mounted component on the second circuit board is inserted from a second side in the axial direction. In the first housing or the second housing, the first recessed portion and the second recessed portion are offset from each other in at least one of the circumferential direction and the radial direction.

In a fan motor, a stator unit of a motor that rotates an impeller includes an annular stator, the center of which is positioned on a central axis, and a housing including an accommodating portion that accommodates a part of a resin portion covering at least a part of the stator. At least one of a bottom face of the accommodating portion oriented to the stator in the axial direction and an inner side face of the accommodating portion oriented to an inner side in the radial direction is provided with a plurality of stepped portions. The stepped portions are different from each other in length in the axial direction when provided in the bottom face, and/or in length in the radial direction when provided in the inner side face. The bottom face, the inner side face, and the stepped portion are covered with the resin portion.

An axial fan includes an upper impeller disposed in an axially upper portion of a housing, and an upper circuit board disposed axially below the upper impeller. An upper impeller cup of the upper impeller includes an upper cylindrical portion and an upper lid. The axial fan includes a lower impeller disposed in an axially lower portion of the housing, and a lower circuit board disposed axially above the lower impeller. A lower impeller cup of the lower impeller includes a lower cylindrical portion and a lower lid. An axial upper end outer diameter of the upper cylindrical portion is smaller than an axial lower end outer diameter of the upper cylindrical portion. An axial lower end outer diameter of the lower cylindrical portion is smaller than an axial upper end outer diameter of the lower cylindrical portion.

A fan waterproof structure includes a frame body and a stator assembly to configure as two individual components. The frame body has a base seat and a circumferential wall. Multiple first support members horizontally extend from the base seat to connect with the circumferential wall. The stator assembly is disposed on the base seat and has an electrical wire. A waterproof plastic layer is disposed on the stator assembly to enclose the stator assembly. A second support member horizontally extends from the waterproof plastic layer to connect with the circumferential wall. The electrical wire is disposed in the second support member to achieve good waterproof effect.

A vacuum pump and a control device are capable of accurately determining timing of rotor blade replacement by creating an index which allows a degree of fatigue of a rotor blade to be determined quantitatively and easily. A motor current value output from a motor drive control portion is input to a time count processing portion, and time in which a current value of a rotating body remains in a range of a stage is totalized for each stage of the current value in the time count processing portion. A rotor blade temperature value output from a rotor blade temperature measurement portion is also input to the time count processing portion. A one-minute average value of the rotor blade temperature value acquired by sampling is calculated. For each stage of the rotor blade temperature value, time in which the average value remains in a range of the stage is totalized.

The subject matter described herein includes a fan assembly for cooling an electric machine and an electric machine incorporating such a fan assembly. One exemplary fan assembly according to the subject matter described herein includes a first fan annulus for surrounding a portion of an electric machine. The fan assembly further includes a fan drive circuit for driving the first fan annulus separately from a drive mechanism of the electric machine. The first fan annulus is configured to be, when rotating to cool the electric machine, mechanically disconnected from a housing and a rotor of the electric machine and separated from the housing by radial gap.

A motor includes a rotor, a stator, and a circuit board below the stator. The stator includes an insulator to cover at least a portion of each of an upper surface, a lower surface, and circumferential side surfaces of each of teeth of the stator, coils each of which is defined by a conducting wire wound around a separate one of the teeth with the insulator therebetween, and a drawn-out wire drawn out from the coils and electrically connected to the circuit board. A lower portion of the insulator includes a guide radially outward of the coils and including a wall extending downward from a lower surface of the insulator and a bend extending radially outward from a lower end of the wall. At least a portion of the drawn-out wire extends in a circumferential direction along a radially outer surface of the wall.

An electric blower capable of more accurately setting the positions of the tip sides of teeth relative to a rotor, while improving the efficiency thereof. A cylindrical-shaped back yoke includes first yoke parts and second yoke parts. The first yoke parts are each positioned between one pair of teeth and between one pair of teeth, to face to each other, and respectively have substantially equal lengths in a circumferential direction. The second yoke parts are respectively positioned between the one pair of teeth and the other pair of teeth, to face to each other, and respectively have substantially equal lengths in the circumferential direction. The first yoke parts respectively have shorter lengths in the circumferential direction compared to the second yoke parts, and further the magnetic passages formed at the first yoke parts are respectively larger than the magnetic passages formed at the second yoke parts.

A waterproof fan includes: a rotor including a rotating blade capable of rotating about a rotation axis; a stator including a plurality of stator cores extending in a radial direction relative to the rotation axis, and a winding wound around each of the stator cores; a frame including a housing space opening toward one side of the rotation axis; a circuit board electrically connected to the winding and housed in the housing space; a waterproofing resin portion covering the stator and the circuit board to block the opening of the housing space; and a positioning member provided in the housing space and configured to position the circuit board at a position away from an inner wall of the housing space.