Abstract: A centrifugal fan includes an impeller and a motor which rotates the impeller. The impeller includes an upper shroud, a lower shroud, and blades arranged therebetween. A rotor of the motor is attached to an attachment part of the lower shroud. In a section passing a rotary shaft of the impeller, the rotor and the attachment part are provided at a more outer side than a circle having a center on a line passing an upper end portion of an inlet opening at an inner side and parallel to the rotary shaft of the impeller, having a radius of 80% of a distance from the upper end portion of the inlet opening to a surface of the lower shroud below the upper end portion, and being tangent to the surface of the lower shroud or passing an end edge portion of the lower shroud.

Abstract: A claw-pole-type stepping motor includes a stator annularly disposed therein and having a coil, a rotor rotatably disposed inside the stator and having a multiply magnetized permanent magnet and a shaft, an outer yoke provided in the stator and having a cup shape opening toward an axially outside direction an outer circumferential portion provided in the outer yoke and having a cylindrical shape and an inner circumferential portion including first pole teeth, an inner yoke provided in the stator and having second pole teeth provided in an inner circumference thereof and an outer circumferential portion fixed to an inner circumferential surface of the outer circumferential portion of the outer yoke, in which the first pole teeth and the second pole teeth are engaging with each other via a gap in an axial direction and are disposed with respect to the permanent magnet of the rotor via a gap, a fixed portion of the inner yoke and the outer yoke is positioned at the axial inside of an opening end of the cup shape

Abstract: There is provided a centrifugal fan including an upper casing which has an air suction opening, a lower casing, and an impeller which is disposed between the upper casing and the lower casing. The impeller includes an upper shroud which is provided on an upper casing side, and a plurality of blades which are arranged along a circumference direction below the upper shroud, and is rotatable around a rotary shaft. A pressure surface of each of the plurality of blades has a convex shape in a rotation direction and is formed with a plurality of protrusions which extend in parallel with the rotary shaft.

Abstract: An impeller includes: a main plate; a shroud; and a plurality of blades provided between the main plate and the shroud and arranged circumferentially; wherein the impeller is configured to rotated about a rotation axis; wherein the plurality of blades include a pressure surface and a negative pressure surface; and the pressure surface has a shape, in which at least three types of circular arcs are connected, as viewed from a rotation axial direction. A centrifugal fan includes the above-described impeller; and three or more pillars, wherein an interval between one adjacent pillars of the three or more pillars is different from an interval between the other adjacent pillars of the three or more pillars.

Abstract: In a centrifugal fan, a casing includes: a top plate; a motor base configured to serve as a bottom plate; and a plurality of support members provided between the top plate and the motor base, wherein an opening functioning as an air outlet opening is formed at each side of the casing so as to be surrounded by adjacent support members, the top plate and the motor base, and an impeller, which is housed between the top plate and the motor base of the casing, includes: an annular shroud; and a plurality of blades arranged in the circumferential direction and provided under the shroud, wherein at least one part of each blade opposes directly the motor base of the casing, and wherein the motor base opposes the lower parts of the blades in the direction of a rotary shaft of the impeller with a predetermined air gap provided therebetween.

Abstract: A motor includes a stator having boss portions on an end plate thereof, a front plate provided on an upper surface of the stator, and a band connecting the stator and the front plate. Recess portions are formed adjacent to an outer peripheral edge of the front plate, and a protruding portion is provided in each recess portion. The band has a bottom plate part and attachment parts. The bottom plate part includes notched portions. Each attachment part includes an engagement portion at a tip end thereof which includes a notched portion. The notched portions of the bottom plate part are fitted with the boss portions of the end plate, and the notched portions of the engagement portions are fitted with the protruding portions of the front plate to form engagement hooks at most tip ends of the engagement portions, respectively, thereby connecting the stator and the front plate.

Abstract: There is provided a centrifugal fan including an upper casing which has an air suction opening, a lower casing, and an impeller which is disposed between the upper casing and the lower casing. The impeller includes an upper shroud which is provided on an upper casing side, and a plurality of blades which are arranged along a circumference direction below the upper shroud, and is rotatable around a rotary shaft. The upper casing and the lower casing configure an open-type casing. A surface of the upper shroud facing the upper casing includes a first portion which becomes closer to the lower casing as separating further from the rotary shaft. A surface of the upper casing facing the upper shroud includes a second portion which faces the first portion of the upper shroud and becomes closer to the lower casing as separating further from the rotary shaft.

Abstract: An impeller and a centrifugal fan having the same are provided. The impeller includes a lower shroud, an upper shroud, and a plurality of blades which are arranged along a circumference direction between the lower shroud and the upper shroud. The impeller is rotatable around a rotary shaft. An outside diameter of the lower shroud is equal to or smaller than an inside diameter of the upper shroud. An inside portion of each of the blades has an inclined portion which connects an inside circle portion of the upper shroud and an inside circle portion of the lower shroud.

Abstract: A centrifugal fan is provided. The centrifugal fan is configured such that an impeller having a plurality of blades along a circumferential direction and disposed between a disk-shaped main plate and an annular shroud is housed in a casing configured by an upper casing and a lower casing, and that an air suctioned from a suction opening is discharged outward in a radial direction of the impeller by a centrifugal force due to a rotation of the impeller. The shroud has a curved surface formed from an outer edge portion toward a center thereof. The shroud has a plurality of protrusions which are formed on the surface of the shroud such that a gap is formed between each of the protrusion portions and the upper casing.

Abstract: A centrifugal fan is provided. The centrifugal fan is configured such that an impeller having a plural blades disposed between a disk-shaped main plate and an annular shroud along a circumferential direction is accommodated in a casing, and that an air suctioned from a suction opening is discharged outward in a radial direction of the impeller by a centrifugal force due to a rotation of the impeller, and thereby discharging the air from the casing. The casing includes an upper plate, a lower plate, and a plural supporting struts interposed between the upper plate and the lower plate, and lateral sides of the casing have only the supporting struts to form a discharge opening.

Abstract: A claw-pole-type stepping motor includes a stator annularly disposed therein and having a coil, a rotor rotatably disposed inside the stator and having a multiply magnetized permanent magnet and a shaft, an outer yoke provided in the stator and having a cup shape opening toward an axially outside direction an outer circumferential portion provided in the outer yoke and having a cylindrical shape and an inner circumferential portion including first pole teeth, an inner yoke provided in the stator and having second pole teeth provided in an inner circumference thereof and an outer circumferential portion fixed to an inner circumferential surface of the outer circumferential portion of the outer yoke, in which the first pole teeth and the second pole teeth are engaging with each other via a gap in an axial direction and are disposed with respect to the permanent magnet of the rotor via a gap, a fixed portion of the inner yoke and the outer yoke is positioned at the axial inside of an opening end of the cup shape

Abstract: A motor includes a stator having boss portions on an end plate thereof, a front plate provided on an upper surface of the stator, and a band connecting the stator and the front plate. Recess portions are formed adjacent to an outer peripheral edge of the front plate, and a protruding portion is provided in each recess portion. The band has a bottom plate part and attachment parts. The bottom plate part includes notched portions. Each attachment part includes an engagement portion at a tip end thereof which includes a notched portion. The notched portions of the bottom plate part are fitted with the boss portions of the end plate, and the notched portions of the engagement portions are fitted with the protruding portions of the front plate to form engagement hooks at most tip ends of the engagement portions, respectively, thereby connecting the stator and the front plate.