Abstract: A cooling fan having a radial-air-gap motor is disclosed. The cooling fan includes a fan frame, an impeller and a stator assembly. The fan frame has a shaft-coupling portion. The impeller has a hub, a shaft and a plurality of blades. The blades are arranged on an outer periphery of the hub. At least one magnetic element is arranged on an inner periphery of the hub. There is a height between a bottom face of the shaft-coupling portion and a top face of the hub. There is a maximum thickness between the bottommost and uppermost faces of the magnetic plate unit. A ratio of the maximum thickness to the height is between 0.1 and 0.6. A method for determining the dimensional proportion of the motor is also disclosed. The method selects a ratio of a maximum thickness to a height as 0.1 to 0.6.

Abstract: An oil pump apparatus in which an electrical pump can be easily disposed is provided. A mechanical pump including: an inner gear which is configured to be driven by an engine; and an outer gear which is configured to mesh with the inner gear, and an electrical pump including: an outer gear which is configured to be driven by a motor section; and an inner gear which is configured to mesh with the outer gear are installed adjacent to each other in the axial direction in a pump installation space of a pump housing having suction ports and ejection ports. A blocking plate which is configured to block communications between the suction ports and the ejection ports is disposed between the mechanical pump and the electrical pump.

Abstract: A fan includes a fan frame, a rotor, a stator module and a protection structure. The fan frame has a base seat and the stator module is disposed on the base seat. The stator module includes a silicon steel sheet assembly having multiple splits and multiple outer faces. The rotor is disposed in the fan frame corresponding to the outer faces of the silicon steel sheet assembly. The protection structure includes multiple posts corresponding to the splits of the silicon steel sheet assembly. The posts are welded with the splits by means of laser welding.

Abstract: A fan includes a fan frame, a rotor, a stator module and a protection structure. The fan frame has a base seat and the stator module is disposed on the base seat. The stator module includes a silicon steel sheet assembly having multiple splits and multiple outer faces. The rotor is disposed in the fan frame corresponding to the outer faces of the silicon steel sheet assembly. The protection structure includes multiple posts corresponding to the splits of the silicon steel sheet assembly. The posts are welded with the splits by means of laser welding.

Abstract: A lower plate includes a lower air inlet arranged radially outward of a bearing portion. In a plan view, a plane is divided into four regions by a first straight line which is parallel to an air outlet and crosses a central axis and a second straight line which is perpendicular to the air outlet and crosses the central axis, and one of the four regions in which a tongue portion is arranged is a first region, followed by a second region, a third region, and a fourth region in this order in a rotation direction of the blades. The air outlet is arranged to extend over both the first and fourth regions.

Abstract: In a blower fan according to a preferred embodiment of the present invention, a stationary portion of a motor portion includes a stator, a bearing portion, and a holding portion to which both the stator and the bearing portion are fixed, while a rotating portion includes a central rotating portion, and an annular cup portion fixed to the central rotating portion. The central rotating portion includes a shaft, a bearing opposing portion, and a cylindrical seal portion. The cup portion includes a cylindrical cup inner wall portion fixed to an outer circumferential surface of the cylindrical seal portion, a cup top plate portion, and a cup outer wall portion. A seal portion having a surface of a lubricating oil defined therein is defined in a seal gap between an inner circumferential surface of the cylindrical seal portion and an outer circumferential surface of the bearing portion.

Abstract: An electric fan is provided, including a labyrinth structure with increased performance of preventing entry of a liquid into a receiving space to receive a stator and a rotor. A clearance is defined between an opposed wall portion of a base and an opposed wall portion of an impeller body, which are opposed to each other in an axial direction of a rotary shaft, to form a labyrinth structure. The opposed wall portion of the base and the opposed wall portions of the impeller body are shaped to form a volume expanding portion within the clearance. The volume expanding portion is constituted from a groove portion for expanding the clearance, having a volume larger than other portions within the clearance.

Abstract: A bearing apparatus according to a preferred embodiment of the present invention includes a bearing portion having a bottom and being substantially cylindrical; a shaft inserted in the bearing portion, and arranged to rotate about a central axis relative to the bearing portion; a bearing opposing portion defined in one piece, arranged above the bearing portion, and arranged to hold an upper end portion of the shaft while covering an outer circumferential surface upper portion and an upper end surface of the shaft; and a cylindrical seal portion arranged to extend downward from the bearing opposing portion. An inner circumferential surface of the cylindrical seal portion and an outer circumferential surface of the bearing portion are arranged to together define a seal gap therebetween, the seal gap including a seal portion having a surface of a lubricating oil defined therein.

Abstract: There is provided with an axial fan comprising an impeller having a plurality of vanes; a motor rotating the impeller; a casing housing the impeller and the motor; a motor base mounting the motor; and a plurality of spokes connecting the motor base and the casing, wherein the motor base has a plurality of reinforcement ribs thereon, the plurality of reinforcement ribs being equal to or more than the plurality of spokes in number, and wherein the casing has a natural frequency equal to or higher than a frequency being transmitted to the casing from the motor when the motor is rotated at a rotation speed of 20000 rpm or more.

Abstract: A fan system in combination with a DC brushless motor. The DC brushless motor includes: a shaft, a base, a stator assembly, a rotor assembly, a control box including a second cavity, and a circuit board. The fan system includes: a blower housing, a wind wheel, a first mounting bracket, and a second mounting bracket. The first mounting bracket is arranged at a first air inlet. The outer side of the first mounting bracket is connected to the upper end surface. The inner side of the first mounting bracket is provided with a first bearing, and the other end of the shaft is disposed on the first bearing. The second mounting bracket is arranged at a second air inlet. The outer side of the second mounting bracket is connected to the lower end surface.

Abstract: A method is disclosed for producing a mini-fan that includes a fan wheel equipped with fan blades (80) and, in order to drive said fan wheel (64), an electric drive motor (61). The latter has an internal stator (90) and an external rotor (62). The latter has a supporting part (64) made of plastic and connected to a shaft (60), which part is implemented integrally with the fan blades (80). The external rotor (62) furthermore has at least one permanent magnet (72; 72?) having hard ferromagnetic particles (74). The plastic supporting part (64) is connected by plastic injection molding to the shaft (60), and by two-component injection molding to a plastic in which the hard ferromagnetic particles (74) of the rotor permanent magnet (72; 72?) are arranged, so that at least a portion of the transition zone (76) between the supporting part (64) and rotor permanent magnet (72; 72?) is formed by a materially engaging connection. The pre-assembled external rotor (62), thus formed, is inserted into the mini-fan.

Abstract: A bearing/stator set retainer structure includes a base seat, a stator set and a retainer member. The base seat has a bearing cup having an internal bearing hole in which a bearing is disposed. The stator set is assembled on the base seat and has an abutment section on one side distal from the base seat. The retainer member has at least one latch section for fixedly assembling the retainer member on the bearing cup. The retainer member further has at least one protrusion section in abutment with the abutment section and at least one inner flange section in abutment with the bearing. Accordingly, the retainer member can be easily disassembled from and reassembled with the bearing cup to facilitate reworking. Also, the retainer member is able to fix the bearing and the stator set at the same time to simplify the assembling process and prolong lifetime of the fan.

Abstract: An exemplary cooling fan includes a housing having an air inlet and an air outlet opposite to the air inlet, a rotor received in the housing, and a stator received in the housing and rotatably supporting the rotor. The rotor includes a hub, blades extending outwardly from an outer periphery of the hub, and flanges slantwise extending from top edges of end portions of the blades. In operation of the cooling fan, air located at an outside of the cooling fan enters the air inlet and flows towards the blades and along the flanges thereby pressing the rotor towards a bottom of the stator along an axial direction of the cooling fan, and the air subsequently flows out of the cooling fan via the air outlet.

Abstract: Disclosed herein is an impeller including: an upper surface, which is an air inlet portion; a lower surface, which is an air outlet portion; and blades formed between the upper and lower surfaces, wherein the upper and lower surfaces are provided with guide grooves for balancing of a motor.

Abstract: A motor includes a cylindrical or substantially cylindrical rotor unit configured to rotate about a rotation axis; a bearing unit arranged to rotatably support the rotor unit; a bearing holder arranged to hold the bearing unit; a disc-shaped or substantially disc-shaped base to which the bearing holder is fixed; a stator unit arranged inside the rotor unit and fixed to the bearing holder; and a circuit board arranged between the base and the stator unit and held by the stator unit. The circuit board is supported on the base through an insulative and flame-retardant vibration-preventing member.

Abstract: The blower comprises: a stator being provided in a case; a radial bearing being provided in the case; a rotor shaft being provided in the case and supported by the stator and the radial bearing; a rotor being integrated with the rotor shaft; and an impeller being integrated with the rotor shaft, the impeller sucking a fluid into the case from an axial direction and sending the same in the circumferential direction of the impeller. The impeller is attached to the rotor shaft to make a blade forming surface of the impeller face the rotor in the axial direction. A shaft end of the rotor shaft, which is located on the opposite side of the impeller, is supported by a thrust receiving member.

Abstract: An axial-flow fan according to the present disclosure can increase the amount of the airflow and simultaneously reduce the noise level. A plurality of stationary blades 11A to 11D are curved, in a convex manner, toward a rotating direction of an impeller. The plurality of stationary blades 11A to 11D are generally inclined so that discharge-side edge portions 11d thereof are located more forward than suction-side edge portions 11c thereof in the rotating direction. An inclination angle ?4 of each of the plurality of stationary blades 11A to 11D in the vicinity of the external end portion 11a is larger than the inclination angle ?3 in the vicinity of the internal end portion 11b. The inclination angle is gradually changed from the vicinity of the external end portion 11a toward the vicinity of the internal end portion 11b.

Abstract: A fan includes an impeller portion generating an air flow and a motor that rotates the impeller portion about a center axis. The impeller portion is attached to a yoke of a rotor portion of the motor and is rotated with the yoke. A circular portion of the impeller is attached to a bottom opening of the yoke having a cylindrical shape whose top is covered by insert molding. Therefore, the impeller and the yoke may be securely fixed to each other. In addition, an outer side surface of the yoke is exposed to outside air such that the space arranged inward from the plurality of blades may be enlarged.

Abstract: A combined axle structure of a stator assembly for a radiator fan, the radiator fan having a pedestal, a stator assembly a rotor blade unit and a reverse axle. the combined axle structure includes a cup-like metal bearing block having bottom and annular walls, an axle socket, and a reverse axle having a bottom end and a reverse pin joint end protruded upwards. The pin joint end is used for alignment and assembly of the sleeving set at the hub center of the rotor blade unit. The bottom end of the reverse axle is tightly inserted and located into the axle socket, the bottom of the metal bearing block is tightly embedded and located onto the embedded locator set at the center of the stator assembly face of the pedestal, and the metal bearing block is located onto the insulated frame via the top end of the annular wall.

Abstract: A centrifugal fan includes a fan frame, a motor, an impeller and an axial positioning member. The fan frame includes a base plate portion, a cover plate portion, and a lateral wall portion arranged between the base plate portion and the cover plate portion. The cover plate portion includes an air inlet, and the lateral wall portion includes an air outlet. The motor is received in the fan frame. The impeller is rotatably coupled with the motor. The axial positioning member is arranged along a path surrounding the air inlet of the fan frame. The axial positioning member includes a coupling face and an abutting face opposite to the coupling face. The coupling face is coupled with the cover plate portion of the fan frame. The abutting face is spaced from the coupling face.

Abstract: A central tubular structure of a shaft seat and a fan device thereof. The central tubular structure includes a base, a bushing connected with the base and a sealing member. The bushing has an outer tubular wall, an inner tubular wall and a top section interconnected between the outer and inner tubular walls to define a receiving space. The inner tubular wall defines a bearing hole. The bushing further has a reception space in adjacency to the base in communication with the receiving space and the bearing hole. The sealing member is fitted in the reception space to seal the same. The fan device is composed of the central tubular structure, a stator assembly, at least one bearing and a fan propeller. The stator assembly is arranged in the receiving space and has a substrate board. The substrate board is free from any perforation and received in the reception space.

Abstract: A centrifugal fan assembly has a fan with a number of vanes at a peripheral edge of a rotor, a motor, arranged coaxially to the inside of the rotor, that rotates the fan, and a casing that houses the fan and the motor. The casing has an air inlet in the direction of a rotating shaft of the fan, and an air outlet in a radial direction. A first part of the casing near the air inlet is arranged relatively towards a center of the casing as compared to the other part of the casing. The motor is mounted on the first part.

Abstract: A blower fan includes a fan frame, a motor, an impeller and a shield. The fan frame includes a base plate portion, a cover plate portion, and a lateral wall portion arranged between the base plate portion and the cover plate portion. The cover plate portion includes an axial air inlet and the lateral wall portion includes an air outlet. The motor is mounted in the fan frame. The impeller is rotatably coupled with the motor. The shield is coupled with the fan frame and has a face facing the axial air inlet. At least one lateral air inlet is formed between the cover plate portion and the shield. An air-guiding space is formed between the at least one lateral air inlet and the axial air inlet of the cover plate portion.

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 base plate of a motor includes an inner bottom plate portion and an elevated portion. A land portion is arranged on an upper surface of a portion of a circuit board which overlaps with the inner bottom plate portion in a plan view, or on a portion of the circuit board which overlaps with the elevated portion in the plan view. A conducting wire extending from a coil is electrically connected to the land portion. This structure enables the conducting wire to be connected to the land portion on the circuit board without the conducting wire being drawn outward beyond an outer circumferential end portion of the base plate. The axial position of the conducting wire connected to the land portion and the axial position of the base plate at least partially overlap with each other.

Abstract: Disclosed is a fan motor including: a lower bracket having a lower protruding portion disposed at the center thereof and a space portion formed around the lower protruding portion; an upper bracket having an upper protruding portion disposed at the center thereof; a rotor disposed between the lower protruding portion and the upper protruding portion in such a manner as to be rotated together with a shaft; a stator core adapted to be surrounded with a lower insulator disposed on the top of the lower protruding portion and with an upper insulator disposed on the underside of the upper protruded portion; and a PCB cover adapted to be coupled under the lower insulator in such a manner as to be disposed into the space portion of the lower bracket and having a PCB insertion space portion formed at the inside thereof.

Abstract: A fan assembly including a rotation shaft, a permanent magnet having a receiving space therein and rotatable around a central axis of the rotation shaft, a fan including a hub having a receiving space therein with one side open and disposed outside the permanent magnet, the fan being rotatable around the central axis of the rotation shaft, a stator disposed inside the permanent magnet, and a blocking portion disposed at the open side of the hub in an axial direction, the combination configured to block an introduction of foreign materials into the fan assembly and to reduce the size of the fan assembly.

Abstract: Fan apparatus for an air conditioner including a fan (50), a shaft (68) coupled to the fan (50), a rotor (60) for transmission of driving force to the shaft (68) for rotating the fan (50), a stator (65) on an inside of the rotor (60) to form a BLDC motor together with the rotor (60), and a fan housing (40) for enclosing the fan (50), thereby reducing noise and enhancing fan (50) efficiency.

Abstract: In a motor, a bearing housing is made of a thermoplastic resin material. A bottom portion of the bearing housing includes a first large diameter portion, a small diameter portion, and a second large diameter portion. The first large diameter portion of the bearing housing is arranged on an upper surface of the base. An outer circumferential surface of the small diameter portion of the bearing housing is arranged radially opposite a side peripheral surface of a base hole. The second large diameter portion is arranged to be in direct contact with a lower surface of the base through caulking.

Abstract: A low noise air generator possessing improved characteristics thereby reducing noise while maintaining or improving air flow generation and output is provided. The device may include an impeller with multiple blades, a noise reduction structure connected to a distal end of the multiple blades, an impeller housing, a tapered motor mounting surface, a heating element, a mechanical air filter, and/or an electrostatic precipitation air filter.

Abstract: A fan motor structure includes a fan frame, a rotor, at least one magnetic element, and a stator. The fan frame includes a frame body and a frame cover that are closed to each other to define a receiving space between them; and a shaft seat mounted on a bottom of the frame body to locate in the receiving space. The rotor includes a hub rotatably connected to the shaft seat, and a plurality of blades outward extended from an outer surface of the hub. The magnetic element is connected to each of the blades in a continuous manner or in a discontinuous manner. The stator is arranged in the receiving space between a bottom of the frame body and the blades. With the fan motor structure, a fan can have increased air intake, produce more air flows and be assembled with reduced time and labor.

Abstract: A fan includes a shaft, a hollow, approximately cylindrical rotor yoke that rotates around the shaft as a rotation axis and is open toward one of its axial ends, a rotor magnet secured to an inner circumference of the rotor yoke, and an impeller secured to an outer circumference of the rotor yoke and arranged to rotate together with the rotor yoke to generate an air flow. One of the impeller and the rotor yoke is provided with an index used for circumferentially positioning the impeller or the rotor yoke.

Abstract: An electric pump includes: a second housing and a first housing separated from each other in an axial direction; a stator portion that accommodates an annular coil portion; an outer rotor portion that is rotated based on a magnetic field generated by the coil portion, at a position on the inner side of the housings; and an inner rotor that is rotatably supported by a support shaft portion having an axis that is offset from that of the outer rotor portion, and that has an outer peripheral surface that is engaged with an inner peripheral surface of the outer rotor portion. The second housing is fitted onto the support shaft portion, to which the first housing has been fixed, from one side of the support shaft portion in the axial direction. As a result, the outer rotor portion and the stator portion are clamped between the first housing and the second housing from both sides in the axial direction.

Abstract: A sleeve support portion is arranged to support a sleeve having a rotating shaft inserted therein such that the rotating shaft is rotatable. A plurality of ribs extending in an axial direction is provided on an inner surface of the sleeve support portion. The ribs are preferably spaced from each other in a circumferential direction centered on the rotating shaft, and arranged to make contact with at least a portion of the sleeve. The ribs include a plurality of types of ribs, each type of the ribs having a different axial position of an axial edge, on an axially opening portion side, of a contact surface thereof which is arranged to make contact with the sleeve.

Abstract: A stator device includes a base having a shaft tube receiving a bearing. The shaft tube includes a top end having at least one groove. A stator unit is mounted around an outer periphery of the shaft tube. The stator unit includes at least one limiting member extending through the at least one groove into the shaft tube. The at least one limiting member prevents the bearing from disengaging from the shaft tube, enhancing assembling convenience. The stator can be coupled with a rotor to form a motor with enhanced assembling convenience and enhanced rotational stability. The base can be interconnected by connecting members to a housing having air inlet and outlet sides. Vanes can be formed on the hub of the rotor to form an impeller. Thus, a heat-dissipating fan can be formed from the stator device.

Abstract: A centrifugal fan includes a housing including a base, a side wall portion having an air outlet defined therein, and a cover arranged above the side wall portion and having an air inlet defined therein. A circuit board is arranged on an upper surface of the base, and includes a circuit board protruding portion arranged to protrude radially outward of the housing. At least one of electronic components to be mounted on the circuit board is arranged radially outward from an inner circumferential surface of the side wall portion.

Abstract: A fan has an electronically commutated external-rotor motor serving to drive it. The motor has an internal stator (20) having a stator lamination stack (64) and a winding arrangement (66; 164, 166, 168, 170) associated with said stack. The internal stator has a central opening (149) for journaling a shaft (42). The fan further has a permanent-magnet rotor (28) separated from the internal stator (20) by a magnetically effective air gap (99), which rotor is equipped on its outer side with fan blades (32) and comprises a shaft (42) journalled in the central opening (149) of the internal stator (20).

Abstract: A miniature fan includes a housing having a mounting portion with a shaft seat. A base is mounted to the mounting portion of the housing. The base includes first and second faces spaced along an axis. An outer layer is provided on the first face of the base. A bottom layer is provided on the second face of the base. The base further includes a coil unit intermediate the outer layer and the bottom layer. The coil unit is electrically connected to a drive circuit. An impeller includes a shaft and a permanent magnet. The shaft is coupled to the shaft seat of the housing and rotatable about the axis. The permanent magnet is aligned with the coil unit. The axial height of the miniature fan is reduced, and the structure of the miniature fan is simplified.

Abstract: A miniature fan, particularly an axial fan, has a space-conserving structure which permits sophisticated electronic control circuits within a limited amount of space. It features an electronically commutated motor (ECM) including an internal stator 68, an external rotor 27 on a shaft 62, and a fan wheel 28 mounted on the rotor and bearing fan blades 26. The motor flange 40? supports a bearing tube 60 which rotatably journals the rotor shaft 62 and is formed with a cavity 84 which receives a first circuit board 86 devoted to control of motor speed and/or voltage, and a second circuit board 96 which supports a galvanometric sensor 100 which senses the rotational position of the rotor, for purposes of triggering commutation of the motor stator windings 68 at appropriate times.

Abstract: A fan assembly with an impeller and shroud for application in a vehicle cooling system. The fan is powered by an external rotor brushless direct current (BLDC) motor having an electronic controller positioned away from the BLDC on an outer shroud wall with a plurality of ducts drawing an airflow from a static lower pressure created by the impeller, the airflow streaming over a heat sink disposed on the controller, exiting through a shroud. The static lower pressure air is pulled by a centrifugal fan and skewed magnets inside the motor through a plurality of ducts in a shroud hub, cooling the BLDC, maintaining low resistance for high efficiency. The BLDC is integrated into the assembly, having a stator fixed in the shroud hub and a rotor directly fused to the impeller, the shroud and impeller forming the BLDC motor without a housing, allowing the motor to easily dissipate heat.

Abstract: A fan assembly with impeller and shroud for application in a vehicle cooling system. The fan is powered by an external rotor brushless direct current (BLDC) motor having an electronic controller positioned away from the BLDC on an outer shroud wall with a plurality of ducts drawing an airflow from a static lower pressure created by the impeller, the airflow streaming over a heat sink disposed on the controller, exiting through a shroud. The static lower pressure air is pulled by a centrifugal fan and skewed magnets inside the motor through a plurality of ducts in a shroud hub, cooling the BLDC, maintaining low resistance for high efficiency. The BLDC is integrated into the assembly, having a stator fixed in the shroud hub and a rotor directly fused to the impeller, the shroud and impeller forming the BLDC motor without a housing, allowing the motor to easily dissipate heat.

Abstract: A series-connected fan unit includes a first fan frame, a second fan frame, a first motor, a second motor and two impellers. The first fan frame has a first base and a first positioning member coupled with the first base. The second fan frame is connected to the first fan frame in series and has a second base and a second positioning member coupled with the second base. The first motor is disposed in the first base and has a first circuit board coupled with the first positioning member. The second motor is disposed in the second base and has a second circuit board coupled with the second positioning member. The two impellers are respectively coupled with the first motor and second motor, wherein an insulation area is formed between the first circuit board and second circuit board.

Abstract: A rotor disk of a vane compressor includes a multiple of slots along an outer diameter and a multiple of magnets along an inner diameter. Each of the multiple of slots is radially aligned with one of the multiple of magnets.

Abstract: A motor includes a balancing member having a surface, a shaft coupling portion and a magnetically conductive portion. A stator is coupled to the balancing member. A rotor includes a hub, a shaft, and a permanent magnet. The shaft and the permanent magnet are mounted inside the hub. The shaft is rotatably coupled to the shaft coupling portion. The permanent magnet includes a magnetically attracting face aligned with the magnetically conductive portion of the balancing member. The magnetically attracting face and the magnetically conductive portion attract each other to maintain stable rotation of the rotor while providing a simplified structure. The balancing member can be interconnected to a housing, and the hub can include a plurality of blades to form a heat dissipating fan. When the rotor rotates, air currents are drawn by the blades to a heat source for heat dissipating purposes.

Abstract: A small sized heat dissipating fan includes a housing, a stator and a rotor. The housing includes a carrying base to hold the stator and rotor. The stator includes a magnetizing member having a plurality of coils and a circuit board electrically connecting to the coils and having a driving circuit and a speed adjuster. The driving circuit, the speed adjuster and the coils electrically connect to each other. The rotor includes a shaft, an impeller fixed to one end of the shaft, and an annular magnet. The other end of the shaft extends through the magnetizing member. The shaft is rotatably coupled to the stator. The annular magnet is mounted to an inner periphery of the impeller and faces the magnetizing member of the stator. Consequently, by adjustment of resistance of the speed adjuster, the rated rotational speed of the heat dissipating fan can be changed.

Abstract: A centrifugal fan assembly has a fan with a number of vanes at a peripheral edge of a rotor, a motor, arranged coaxially to the inside of the rotor, that rotates the fan, and a casing that houses the fan and the motor. The casing has an air inlet in the direction of a rotating shaft of the fan, and an air outlet in a radial direction. A first part of the casing near the air inlet is arranged relatively towards a center of the casing as compared to the other part of the casing. The motor is mounted on the first part.

Abstract: A motor according to the present invention preferably includes a boss portion preferably includes an inner ring portion including a substantially ring shaped convex portion at an axially lower end surface thereof. The boss portion preferably includes a through hole at which a shaft is press fitted at a central portion thereof. A rotor holder including a substantially cylindrical shape includes a through hole centered about a rotary axis. The through hole and the inner ring portion of the boss portion are fitted to one another. The convex portion includes a portion plastically deformed outwardly in the radial direction to sandwich an inner circumferential surface of the rotor holder. The inner circumferential surface of the impeller cup portion includes a plurality of convex portions near an upper portion thereof. The rotor holder is press fitted into the inner circumferential surface of the impeller cup portion via the convex portions.

Abstract: The present invention provides fan with an inrunner motor. The fan includes a fan frame, a rotor and a stator. The fan frame includes a base. The rotor includes a hub, a bushing and a magnetic member, wherein the magnetic member sleeves on the bushing. The stator is disposed on the base and coupled with the rotor, and the stator includes a shaft through the bushing, wherein an end of the shaft is fixed on the base.

Abstract: An electric motor includes a stator portion, a rotor portion, and a bearing mechanism, wherein the rotor portion includes a rotor holder having a substantially cylindrical shape with a closed end, and a field magnet fixed to an inner circumference of the rotor holder; the stator portion includes a stator, a base portion to which the stator is fixed, and a magnetic member; and the magnetic member includes a cylindrical portion having a substantially cylindrical shape into which a lower end portion of an insulator of the stator is inserted, the lower end portion being a portion of an outer portion of the insulator and opposing the base portion, and a flat portion having a substantially annular shape which spreads outwardly in a radial direction from a lower edge of the cylindrical portion and opposes a lower edge of the field magnet.

Abstract: An outer rotor type fan-motor includes: a rotational shaft; a bearing assembly that rotatably supports the rotational shaft; a stator installed at an outer side of the bearing assembly; a permanent magnet assembly that covers an outer side of the stator at a certain distance and is installed at the rotational shaft; and a fan that includes a shaft fixing part for fixing the rotational shaft, a hub for covering an outer side of the permanent magnet assembly at a certain distance and blades formed around the hub. An insulation space is formed between the permanent magnet assembly and the fan to prevent transfer of vibration and noise of the permanent magnet assembly to the fan, and vibration or noise of high frequency can be reduced.