Nidec Corporation

Ryota Hayashida

Tsukasa Takaoka

Ryota Yamagata

Shinsuke Hamano

Makoto Kobayashi

Shoki Yamazaki

Yoshiaki Oguma

Masamune Hiraki

Atsushi Higashidani

An impeller of an axial fan includes a cup-shaped blade support portion configured to cover a rotor holder, and blades in a circumferential direction outside of the blade support portion. Rotation of the impeller generates a downward air flow from the inlet of the axial fan to the outlet of the axial fan. The axial fan includes first and second balance correction portions. The first balance correction portion is located between the blade support portion and the rotor holder. The second balance correction portion is located axially below the first balance correction portion, and is located axially below the rotor holder and a junction of each blade with the blade support portion. The impeller includes a first cone portion located axially below the second balance correction portion. A tangent to a radially outer surface of the first cone portion crosses the second balance correction portion.

Axial fan and fan assembly

A fan includes a motor, an impeller fixed to the motor, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is &#xbd; times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.

Axial flow fan

An impeller of an axial fan includes a cup-shaped blade support portion configured to cover a rotor holder, and blades in a circumferential direction outside of the blade support portion. Rotation of the impeller generates a downward air flow from the inlet to the outlet. The axial fan includes first and second balance correction portions. The first balance correction portion is located between the blade support portion and the rotor holder. The second balance correction portion is located axially below the first balance correction portion, and is located axially below the rotor holder and a junction of each blade with the blade support portion. The impeller includes a first cone portion located axially below the second balance correction portion, and decreases in diameter with decreasing height. The impeller includes a cylindrical portion including a cylindrical outer circumferential surface and located between the first cone portion and the second balance correction portion.

A fan includes a motor part, an impeller fixed to the motor part, and a housing including a cylindrical inner circumferential surface. The impeller includes a plurality of blades extending radially outward. The housing is arranged to surround outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an upper edge which surrounds the intake port, an exhaust port which is a lower opening of the housing, a lower edge which surrounds the exhaust port. An axial distance from an upper end of each of the blades to an upper edge is &#xbd; times or more of an axial distance from the upper end of each of the blades to a lower end thereof. This makes it possible to restrain an air flow having a swirling component from passing through the intake port.

An impeller of an axial fan includes a cup-shaped blade support portion configured to cover a rotor holder, and blades arranged in a circumferential direction radially outside of the blade support portion. Rotation of the impeller generates a downward air flow. The axial fan includes first and second balance correction portions. The first balance correction portion is located between the blade support portion and the rotor holder. The second balance correction portion is located axially below the first balance correction portion, and is located axially below the rotor holder and a junction of each blade with the blade support portion. The impeller includes a first cone portion located axially below the second balance correction portion, and decreases in diameter with decreasing height.

Axial fan having balance correction portions and a cone located axial of one of the balance correction portions

A fan includes a motor part, an impeller fixed to the motor part, a housing, and a first circuit board mounted with electronic components. The motor part includes an armature having coils, and a second circuit board connected to the coils and the first circuit board. The housing surrounds outer peripheries of the motor part and the impeller. The housing includes an intake port which is an upper opening of the housing, an exhaust port which is a lower opening of the housing, a flange portion enlarged radially outward from an outer circumferential surface of the housing, and a circuit board fixing portion protruding from the outer circumferential surface and making contact with the first circuit board. The first circuit board is disposed spaced apart from the outer circumferential surface, positioned radially inward of a radial outer edge of the flange portion, and arranged to extend in an axial direction.

A fan includes a stationary portion, a rotating portion, and an impeller arranged to rotate about a central axis together with the rotating portion to produce an axial air current. The rotating portion includes a rotor holder. The impeller includes a cup portion arranged to cover the rotor holder and a plurality of blades arranged on an outer circumference of the cup portion. The cup portion includes a cup cover portion arranged to extend radially outward from the central axis; a cup cylindrical portion being substantially cylindrical in shape, and arranged to extend in an axial direction from an outer edge portion of the cup cover portion; and a cup through hole arranged to extend through the cup portion at a position overlapping with a portion or boundary between the cup cover portion and the cup cylindrical portion.

A fan motor includes a motor; an impeller; a motor control board; an AC/DC converter board; electronic components mounted on the AC/DC converter board; and a housing arranged to contain the motor, the impeller, the motor control board, and the AC/DC converter board. The housing includes a base portion arranged to hold a stationary portion of the motor on an axially upper side thereof; and a case portion arranged to extend to assume a tubular shape on an axially lower side of the base portion. The AC/DC converter board is arranged in an interior space of the case portion. At least a portion of the interior space is filled with a resin material. Surfaces of the AC/DC converter board and the electronic components are covered with the resin material. The fan motor further includes a projecting portion arranged to project into the interior space.

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Kyoto, Japan

Ryota Hayashida