Abstract: A serial axial fan preferably includes a first impeller and a second impeller each having a plurality of blades radially extending with a predetermined rotation axis as the center, a first motor portion, a second motor portion, a first housing, and a second housing. The first motor portion has a first circuit board on which at least one electronic component arranged to control the driving of the first impeller is mounted. The second motor portion has a second circuit board on which at least one electronic component arranged to control the driving of the second impeller is mounted. The first and second circuit boards are electrically connected. The driving of the first impeller and the driving of the second impeller are controlled by the electronic component disposed on at least one of the first and second circuit boards.

Abstract: A serial axial fan includes first and second axial fans. Each of the first and second axial fans includes a base portion and a plurality of support ribs arranged to connect the base portions to housings. The first and second axial fans are coupled together with the base portions thereof either in contact with or in close proximity to each other. Each of the support ribs in each of the first and second axial fans extends over both housings of the first and second axial fans.

Abstract: The manufacturing method of a rotor holder according to the present invention includes a step in which a top plate portion having a substantially discoid shape substantially centered about a central axis, and a side wall portion extending from an outer circumferential edge of the top plate portion are formed simultaneously by feeding a metal plate in a predetermined direction and pressing the metal plate by a die. Also, the present manufacturing method includes a step in which a punched portion is formed at the side wall portion.

Abstract: An axial fan unit includes two or more impellers which rotate about a center axis in opposite directions relative to each other to create an axial airflow. Each impeller includes a hub and a plurality of blades disposed around the hub. The impellers are surrounded by a housing in a radial direction that is perpendicular or substantially perpendicular to the center axis. On a cross-sectional plane of the axial fan unit including the center axis, a distance between the hubs of the impellers and the housing decreases from an upstream side to a downstream side in a direction of the axial airflow.

Abstract: Fan includes wires electrically connected to the circuit board outwardly extends from a base toward a housing along a rib connecting the base supporting a motor and the housing. The housing includes a wire-receiving section defined by a through hole extending in the housing, and a slit connecting the through hole and an outside of the housing along a direction in which the through hole extends. The wires are inserted into the wire-receiving section via the slit, and then, led outside of the housing through the wire-receiving section. A wire-holding member is then inserted into the wire-receiving section to close the slit to prevent the wires from coming out of the wire-receiving section and to restrict the movement of the wires.

Abstract: A serial axial fan preferably includes a first impeller and a second impeller each having a plurality of blades radially extending with a predetermined rotation axis as the center, a first motor portion, a second motor portion, a first housing, and a second housing. The first motor portion has a first circuit board on which at least one electronic component arranged to control the driving of the first impeller is mounted. The second motor portion has a second circuit board on which at least one electronic component arranged to control the driving of the second impeller is mounted. The first and second circuit boards are electrically connected. The driving of the first impeller and the driving of the second impeller are controlled by the electronic component disposed on at least one of the first and second circuit boards.

Abstract: A serial axial fan includes first and second axial fans. Each of the first and second axial fans includes a base portion and a plurality of support ribs arranged to connect the base portions to housings. The first and second axial fans are coupled together with the base portions thereof either in contact with or in close proximity to each other. Each of the support ribs in each of the first and second axial fans extends over both housings of the first and second axial fans.

Abstract: The manufacturing method of a rotor holder according to the present invention includes a step in which a top plate portion having a substantially discoid shape substantially centered about a central axis, and a side wall portion extending from an outer circumferential edge of the top plate portion are formed simultaneously by feeding a metal plate in a predetermined direction and pressing the metal plate by a die. Also, the present manufacturing method includes a step in which a punched portion is formed at the side wall portion.

Abstract: Fan includes wires electrically connected to the circuit board outwardly extends from a base toward a housing along a rib connecting the base supporting a motor and the housing. The housing includes a wire-receiving section defined by a through hole extending in the housing, and a slit connecting the through hole and an outside of the housing along a direction in which the through hole extends. The wires are inserted into the wire-receiving section via the slit, and then, led outside of the housing through the wire-receiving section. A wire-holding member is then inserted into the wire-receiving section to close the slit to prevent the wires from coming out of the wire-receiving section and to restrict the movement of the wires.

Abstract: A motor includes a rotor and a stator. The stator includes a circuit board on which a control circuit for controlling rotation of the rotor is formed. A circuit component of the control circuit is mounted on a surface of the circuit board facing a base portion. A heat conductive member is arranged between the base portion and the circuit component to be in contact with the base portion and the circuit component. Thus, a heat generated by the circuit component is transferred to the base portion through the heat conductive member and is then transferred to connecting portions and a wall of a housing which are formed integrally with the base portion from thermally conductive material.