Abstract: A fan 30 for mounting at one end of the armature of an electric motor comprises a ring portion 40 of moulded thermoplastic material supporting an annular plate 42 with integrally formed fan blades 46 in axial alignment with exhaust vents formed in the housing of the motor. The fan blades 46 extend radially across a face of the annular plate 42 remote from the ring portion 40 and extend into the annulus of the plate. The blades 46 are grouped and centered on the winding tunnels of the armature with the axially outer edges of the blades of each group joined together by a radial wall 50 within the radial spacing of the annulus of the plate 42 but axially spaced therefrom.

Abstract: An electrical generator (80) utilizes supplemental blowers or fans (140) to move additional cooling fluid through coolant flow paths (116, 124) in the generator, thus reducing the internal temperature of the generator. The supplemental blower comprises a blower (160) for supplementing cooling fluid flow through a discharge coolant flow path (155) and/or a supplemental blower (176, 178) for supplementing cooling fluid flow through an inlet coolant flow path (156). Either supplemental blower has the effect of lowering the peak internal generator temperature (134).

Abstract: An improved electric motor cooling construction where the motor stator is contained within the motor housing. The motor covers and motor housing are designed to provide direct increased airflow to the motor stator, and coil windings to provide better airflow through the motor resulting in improved cooling.

Abstract: The present invention is directed to a coil unit of a single-acting linear engine. The coil unit includes an iron core with coils that are linked with the iron core by way of a cast compound thereby forming a molded part. The molded part is enclosed by a housing having a narrow circumferential gap formed between the housing and the molded part. Through the gap, cooling air may flow or be blasted. The air extensively cools the iron core with the coils and thermally insulates the housing from the iron core and the coils.

Abstract: In an electrical machine, in particular a generator for a motor vehicle, having a housing (2), a rotor (6), supported rotatably in the housing (2) about a pivot axis (5), at least one fan wheel (20), connected to the rotor (6), for generating a cooling air flow (22, 22?, 22?) from at least one intake opening (37; 37?; 37?) disposed in the housing (2) to at least one outlet opening (24) disposed in the housing (2), and at least one regulator chip (31), disposed on a chip holder (30), for regulating the current generation, it is provided that the chip holder (30) is disposed such that it is bathed at least in part directly by the cooling air flow (22, 22?, 22?). As a result of this arrangement, it is attained that a very high heat transfer coefficient is present, because of the high flow speed of the cooling air flow (22, 22?, 22?).

Abstract: An improved air moving device that is scalable for use in a variety of applications requiring different fan sizes. The fan includes a number of fan blades, each having a discrete magnet mounted thereon. The orientation of each magnet is such that the direction of the magnetic field alternates from one blade to the next. The outside edge of each blade is metalized in a way that the magnetic field is present across the entire outer edge of the fan blade. In an alternate embodiment the fan blade assembly includes fan blades fabricated of a ferrous material in which the tips of the blades are magnetized through exposure to a strong magnetic field after fabrication of the blade assembly. The configuration of the blades in both embodiments enables the differential in field strength to assist with the rotation of the fan blades.

Abstract: A fan for an electrical machine having discrete fan blades mounted for rotation with the machine rotor. Each blade has a unitary mounting plate and is secured to the machine rotor or to a carrier on the rotor shaft. The preferred blade has a concave surface facing axially of the rotor in one direction and a convex surface facing axially of the rotor in the other direction. The concave/convex surfaces are formed by two flat triangular surfaces joined along a common edge. The triangular structure is fatigue resistant, reducing, the likelihood of mechanical failure.

Abstract: A very thin fan motor with an attached heat sink that has high heat radiation and air cooling effects in a small, flat, thin package, that has a simple and easily assembled overall structure as a fan motor, and that has superior cooling efficiency.

Abstract: In a vehicle alternator having a stator, a rotor, and frames, a disc group is fixed to an axial end surface of a magnetic pole core of the rotor for creating the flow of cooling air. The disc group includes a plurality of discs layered with gaps between them. The disc group is disposed rotatable with the rotor. When the disc group rotates with the rotor, cooling air flows in a radially outward direction along the disc surfaces.

Abstract: A rotating electric machine comprising at least a fan (43) provided with blades providing between them divergent ventilation channels (48) adapted to generate cooling fluid flow through the machine; the angle of incidence (B) of the blades, at the leading edge ranges between 150 degrees and 175 degrees, while the angle of incidence (A) of the blades at the trailing edge ranges between 90 degrees and 165 degrees relative to the tangent to a circle (C) generated during the rotation of the blades, the ratio between the average pitch of the blades (46) and the average length thereof being less than 0.975. The invention is applicable to fans for a motor vehicle alternator.

Abstract: In the case of an electrical machine, in particular an alternator for a motor vehicle, having a housing (2), a rotor (6) that is supported in the housing (2) in a manner that allows it to rotate around an axis of rotation (5) and that has at least one rotor winding (14) and at least one fan wheel (21) mounted on the rotor (6) for generating convection in the housing (2) and for dissipating heat from the at least one rotor winding (14), the at least one fan wheel (21) is joined with the rotor (6) at least in a linear manner in order to better cool the rotor (6).

Abstract: It is an object of the present teachings to provide a technique that rationalizes the structure of the brushless motor so as to save space in the power tool. According to the present teachings, a representative brushless motor utilized in a power tool may comprise a stator, a rotor and a cooling fan. The brushless motor is disposed within the power tool. The brushless motor is adapted to supply driving current to the stator to drive a tool bit of the power tool by rotating the rotor. The cooling fan is molded of a magnetic or conductive material so that the cooling fan also serves as a rotating position detector that detects the rotating position of the rotor with respect to the stator. Because the cooling fan may also have a function of rotating position detector of the rotor, the inner space of the power tool can be rationalized.

Abstract: A method is performed for attaching a fan to a rotor assembly for a dynamounted electric machine. A shaft is mounted within a housing of the dynamo-electric machine. The shaft includes an integral shoulder portion for creating an abutment surface. A fan which includes a fan base and a plurality of fan blades protruding from the fan base is mounted on the shaft. The fan base has a central bore wherein an inner circumference of the fan base along the central bore is juxtaposed to the abutment surface. A pair of pole cores is mounted axially along the shaft toward the shoulder portion so as to clamp the fan between a respective end of the pole cores and the abutment surface.

Abstract: A ring-like rib 19 is erected on an inner circumferential edge of an insertion hole 11, which is opened in the scroll casing 1 so that the fan f is inserted therethrough, while a side wall 18 facing the ring-like rib 19 is provided in the bracket 15 blocking the insertion hole 11. A helical groove portion 20 and a protruding portion 21 are formed in one of an outer surface of the side wall 18 and an inner surface of the ring-like rib 19 and in the other thereof, respectively. The bracket 15 is caught in the scroll casing 1 by turning the bracket 15 in a direction opposite to a direction of rotation of said fan f. Further, during the engagement therebetween, a cooling duct 4 is formed.

Abstract: An improved generator fan serves to draw air into the generator through an inlet in the generator housing, pass the air through the rotor and stator, and direct the air out openings in the generator housing. The fan of the present invention includes a disc and at least one multi-directional blade extending from the disc. The multi-direction blade includes a leading segment extending from the disc between a first radius measured from the axis of rotation and a second radius, the leading segment including a leading edge extending from the disc at an angle of about ninety degrees from the disc, the leading segment extending from the disc with an increasing angle along the length of the leading segment; and a trailing segment extending from the disc between the second radius and a third radius measured from the axis of rotation, the third radius being greater than the second radius and the trailing segment extending from the disc with an angle having a rate of change different than the leading segment.

Abstract: A heat-radiating structure for ceiling fan's motor housing, on the upper and the lower surfaces of a motor housing is provided with arched ears, each ear is provided with a ventilation orifice for sucking outside in and blowing it out; on the periphery of the motor housing is defined with inclined flow deflectors for introducing outside air in and expelling it out, with these structures, the motor housing itself is possess with an ability of heat-radiating.

Abstract: A method is performed for attaching a fan to a rotor assembly for a dynamo-electric machine. A shaft is mounted within a housing of the dynamo-electric machine. The shaft includes an integral shoulder portion for creating an abutment surface. A fan which includes a fan base and a plurality of fan blades protruding from the fan base is mounted on the shaft. The fan base has a central bore wherein an inner circumference of the fan base along the central bore is juxtaposed to the abutment surface. A pair of pole cores is mounted axially along the shaft toward the shoulder portion so as to clamp the fan between a respective end of the pole cores and the abutment surface.

Abstract: The invention relates to a rotating electric machine, especially an alternator or alternator/starter for motor vehicles, including a stator surrounding a rotor (10) equipped with a pack of metal plates, a gap between the stator and the rotor, permanent magnets integrated into the rotor and excitation coils (14) integrated into the rotor, in which the excitation coils are wound around salient poles (1310) cut out in the pack of metal plates of the rotor, and the permanent magnets are accommodated in housings (13110) formed in the pack of plates of the rotor and open towards the periphery of the rotor, characterized in that the housings (13110) are closed axially at each of their ends by a non-magnetic retaining piece (13) equipped with a part intended to come into abutment with the magnets, and in that the retaining piece features recesses for accommodations [sic] of the buns of the excitation coils (14).

Abstract: An improved generator has an improved rotor assembly that includes a rotor shaft defining an axis of rotation, a first pole member and a second pole member mounted on the rotor shaft and a deflector supported about the axis of rotation and having non-magnetic axial extensions. Pole claws of the first pole member and second pole member comprise north and south poles that are intermeshed and spaced apart from one another. The deflector is supported about either of the first end or second end of the shaft and corresponds to the member mounted on the same end of the shaft. The deflector is adapted to rotate with the corresponding member and includes a plurality of non-magnetic axial extensions having a base extending between adjacent pole claws of the corresponding member. The non-magnetic axial extensions provide a substantially uniform circumference creating more desirable airflow as the improved rotor assembly rotates about its axis.

Abstract: A fan (10) is disclosed having a downrod (11), a motor (12), a motor housing (13) substantially encasing the motor (12), and blades (14) mounted to the motor housing (13). Each blade (14) has an air intake scoop (16 adjacent to and extending from the motor housing (13). The interior space (17) created by the intake scoop (16) is in fluid communication with an opening (18) extending through the motor housing (13). Rotational movement of the air intake scoops (16) create airstreams which are directed to the electric motor for ventilation purposes.

Abstract: An improved generator has an improved rotor assembly that includes a rotor shaft defining an axis of rotation, a first pole member and a second pole member mounted on the rotor shaft and a deflector supported about the axis of rotation and having non-magnetic axial extensions. Pole claws of the first pole member and second pole member comprise north and south poles that are intermeshed and spaced apart from one another. The deflector is supported about either of the first end or second end of the shaft and corresponds to the member mounted on the same end of the shaft. The deflector is adapted to rotate with the corresponding member and includes a plurality of non-magnetic axial extensions having a base extending between adjacent pole claws of the corresponding member. The non-magnetic axial extensions provide a substantially uniform circumference creating more desirable airflow as the improved rotor assembly rotates about its axis.

Abstract: A bus cooling fan that operates without an external electrical power supply. The fan is positioned proximate two bus bars of a polyphase electrical system. The fan includes a rotor supporting fan blades and mounted on an axle. The axle is supported by cross-braces in a shroud surrounding the rotor. The shroud is open at the ends. The fan is fabricated of non-ferrous, non-conducting material with the exception of the rotor. The bent rods which interact with the electromagnetic field created by the current-carrying bus bars of the polyphase electrical system to make the rotor function as an induction motor when the fan is placed proximate two bus bars.

Abstract: A rotating electric machine having a plurality of ventilating passages formed between a stator frame and a stator iron core, a cooler which cools a coolant is provided at least in one ventilating passage, communicating with a central portion of the stator iron core, of the plurality of ventilating passages, and a ventilating circuit in which the coolant cooled by the cooler is allowed to flow to the central portion of the stator iron core in a direction from an outer peripheral side to an inner peripheral side of the stator iron core via the at least one ventilating passage which communicates with the central portion of the stator iron core.

Abstract: A method for forming an electric motor includes providing a stator and an armature having a lamination stack with slots therein in which magnet wires are wound. Thermally conductive plastic is molded over at least a portion of the armature to at least partially encase the magnet wires and to mold a fan. The fan is molded without any portion of the fan extending into the slots in the lamination stack of the armature to increase the volume in the slots in which the magnet wires can be wound and the magnet wires are wound in this increased volume when they are wound in the slots in the lamination stack to increase a power rating of the electric motor beyond what is normally attainable with a fan component having portions extending into the slots in the lamination stack.

Abstract: In an alternator having a vacuum pump capable of improving a cooling characteristic, and having a rotary shaft supported by bearings installed in a rear bracket of the alternator, a housing of the vacuum pump has vanes and a rotation rotor is installed on the rotary shaft. A pump bracket is assembled to a lower portion of the housing and includes a packing inserted in an outer circumferential portion of a center shaft hole of the pump bracket for implementing a sealing operation in surface-contact with the rear bracket. A certain space is formed between the packing and the shaft hole for preventing a heat transfer, and a heat radiating unit is installed in a lower surface of the pump bracket.

Abstract: An improved vacuum motor air intake for use on vacuum motor device with a funnel shaped shroud enclosing a portion of the vacuum motor housing adjacent a fan assembly. Combined with the funnel shaped shroud, a conical air deflection body directs air entering the motor in a laminar flow pattern.

Abstract: A miniature brushless dc fan motor comprises an annular housing, a bearing assembly, a permanent magnet set, a blade set and a coil set. The permanent magnet set is inserted into a hub of the blade set which is located at a center. A shaft is extended through the permanent magnet set to form a rotor. The coil set is secured to an inner circumference of the annular housing and radially aligned with the permanent magnet set. An air channel is formed between the permanent magnet set and the coil set, and adapted to accommodate the blade set.

Abstract: An alternator fan having a generally disc-shaped body with opposed first and second faces. The body includes a plurality of ribs that define raised peaks on the first face and recessed valleys on the second face.

Abstract: An air cooler device for an enclosed rotational electrical machine includes an air inlet and an air outlet provided in the casing of the electrical machine, and a fan simultaneously driven by the machine's power output shaft, an independently installed fan device, or both a simultaneously driven and an independently installed fan device. The fan or fans pump air or other selected gases inside the rotational electrical machine to allow a cooling air stream to flow through the outlet to an air cooler for indirect heat dissipation, and then back to the rotational electrical machine through the inlet.

Abstract: A fan-flywheel-pulley assembly for use in conjunction with an electric motor. The assembly may include a pulley positioned about a central axis. The assembly may also include a flywheel coupled to the pulley and positioned about the central axis, the flywheel including an outer circumferential flywheel surface partially forming a plurality of circumferentially spaced openings. The flywheel may also include a baffle that extends circumferentially in close proximity to a cylindrical wall unit of the motor from an inner diameter to an outer diameter to limit a gap between the baffle and the cylindrical wall unit. Further, the assembly may also include a radial fan disposed within the flywheel including a plurality of blades extending at least from the flywheel inner diameter to the outer diameter each opening is positioned between each adjacent fan blade. The pulley, the flywheel, and the radial fan may be integrally formed.

Abstract: A pump housing (14, 16) has a fan guard (40) secured to the end of the housing by four crescent-shaped tabs (60) fitting into four crescent-shaped cast-in recesses (66) of the housing (14, 16) and ears (68) of the tabs (60) fitting into cast-in holes (70) in the housing (14, 16). The ears (68) and boles (70) on opposite sides of the housing (14, 16) are aligned along a common axis (80, 82). The ears (68) are tapered at their leading ends (90) and squared off at their trailing ends (92), and the guard (40) has a radial projection (56) that fits into an opening in the housing (14, 16).

Abstract: A monodirectional impeller for centrifugal electric pumps having a permanent-magnet synchronous motor, having vanes which are deformable at least along part of their extension so as to change their curvature, when loaded, in one direction of rotation, so that the power required for rotation in that direction is greater than the maximum power that can be delivered by the motor.

Abstract: According to the present invention, a cooler for electronic devices comprises a heat exchange element, a blower with a radial type impeller, and an electric drive. The heat exchange element comprises heat exchanging means made on one surface of said heat exchange element while its other surface provides thermal contact with a heat-radiating means. The radial type impeller has a shroud with a flat surface from one side, a hub and brackets and a central inlet between the shroud and the hub, the brackets connect the hub with the shroud. The radial type impeller is positioned on the heat exchange element so that the heat exchanging means being surrounded by the radial type impeller and a cooling gas flows to the radial type impeller from the central inlet through the heat exchanging means.

Abstract: The aim is to improve the cooling of a self-ventilated electric motor (1). To this end, an electromagnetic speed limiting and governing device is provided between the motor shaft (3) and the fan wheel (2), the fan wheel, which is driven via an electromagnetic slip coupling (6, 10) in accordance with the motor speed, being mounted freely rotatably on the motor casing or on the motor bearing plate (5).

Abstract: A magneto-generator capable of suppressing temperature rise of an armature winding and ensuring an improved electricity generation efficiency includes a flywheel having a cylindrical peripheral wall formed with a flat bottom wall at one end thereof, a plurality of magnets disposed on and along an inner peripheral surface of the cylindrical peripheral wall, a generator coil disposed internally of the flywheel in opposition to the magnets for generating electricity under electromagnetic induction taking place between the magnets and the generator coil, ventilating through-holes formed in a joined portion of the cylindrical peripheral wall and the flat bottom wall so as to extend partially through both of them, and upstanding fins disposed on the bottom wall for generating forced air flows from interior to exterior of the flywheel through the ventilating through-holes upon rotation of the flywheel.

Abstract: In a preferred embodiment, the invention comprises an apparatus for generating electrical power which utilizes an electrically superconductive coil immersed in a cryogenic fluid for generating a magnetic field within a region surrounding the superconductive coil when an electrical current circulates in the superconductive coil. The apparatus further includes a prime mover and a conduit which conducts a flow of gas resulting from evaporation of a cryogenic fluid to the prime mover to induce rotational motion in the prime mover. An electrical conductor is rotatably mounted within the region surrounding the superconductive coil in which the magnetic field is generated. The electrical conductor is operatively connected to the prime mover so that rotational movement of the prime mover is transferred to the electrical conductor to generate an electrical output current.

Abstract: Centrifugal fans are fixed to axial end surfaces of first and second pole cores such that 0.2<t/h<0.7, where t is an amount of axial protrusion of the centrifugal fans relative to apex portions of front-end and rear-end coil end groups of a stator winding and h is an axial height of the centrifugal fans.

Abstract: In an alternator, a pole core has a plurality of claw-pole pieces, and a cooling fan has a plurality of diagonal-flow-type blades and a plurality of centrifugal-flow-type blades. A combination of numbers of the claw-pole pieces and the diagonal-flow-type blades is determined to suppress an interference of wind noises caused by the claw-pole pieces and the diagonal-flow-type blades during operation, such that one of the numbers of the claw-pole pieces and the diagonal-flow-type blades is not divisible by the other and both numbers have no common divisor other than one. Further, a number of the centrifugal-flow-type blades is determined not to be divisible by the numbers of the diagonal-flow-type blades and the claw-pole pieces, and all the three numbers have no common divisor other than one.

Abstract: A motor pump is provided in which the motor rotor is optimally force balanced for enhanced operation. The motor pump includes a pump head for pressurizing a fluid, and an electric motor drives the pump head. High pressure fluid is circulated through the motor air gap. The shaft of the motor rotor is axially movable with respect to the pump head such that the motor rotor is effectively floated in high pressure fluid as the fluid flows through the motor.

Abstract: A cooling assembly includes an electric motor 10 for driving a fan 16. At least one spoke structure 18 is coupled to and extends generally radially from a periphery of the motor body so as to be exposed to airflow caused by rotation of the fan 16. An electronic component 24 of the motor is operatively associated with the spoke structure 18 such that heat of the electronic component is conducted to the spoke structure and to a spoke extension 22.

Abstract: An electromagnetic propulsion fan includes a hub and a plurality of fan blades coupled to the hub. The electromagnetic propulsion fan also includes a rim coupled to the fan blades such that rotating the rim causes the fan blades to rotate. The rim includes a plurality of magnets coupled thereto. The electromagnetic propulsion fan further includes a plurality of electromagnets in proximity to the rim, the electromagnets controllable to generate magnetic fields that interact with the magnetic fields of the magnets to cause the rim to rotated.

Abstract: Since a structure of a cooling fan of an alternative current generator for a vehicle is formed with a resin molding product having an insert metal fitting, a freedom degree on said fan design shape configuration and said installation performance of said fan to a core can be compatible. A cooling fan structure having a high shape configuration design freedom degree and having an installation strength similar to that of said fan according to said prior art can be obtained.

Abstract: A bypass discharge motor assembly with improved noise reduction includes a motor assembly having a rotatable shaft. A working air fan assembly and a cooling fan are rotated by the shaft. A cooling fan housing is coupled to the motor assembly and partially encloses the cooling fan. The cooling fan housing has at least one radial air entry part for radially receiving cooling air drawn into the housing by the cooling fan.

Abstract: A circuit board fixing structure of a heatsink fan includes a housing having a pivot portion having a periphery provided with multiple poles. The housing is provided with a pair of positioning seats and a conducting wire receiving socket. The two positioning seats are formed with two insertion grooves. A circuit board is mounted in the insertion grooves of the positioning seats of the housing, and has a sensor and a conducting wire. The conducting wire may pass through the conducting wire receiving socket of the housing.

Abstract: A cooling assembly includes an electric motor 10 for driving a fan 16. At least one spoke structure 18 is coupled to and extends generally radially from a periphery of the motor body so as to be exposed to airflow caused by rotation of the fan 16. An electronic component 24 of the motor is operatively associated with the spoke structure 18 such that heat of the electronic component is conducted to the spoke structure and to a spoke extension 22.

Abstract: In an alternating current generator and fans thereof in accordance with the invention, the cooling efficiency of the alternating current is improved by fans fixed to a rotor. When the fans are formed during a press working operation, the blades are formed directly from the fans by cut-raising the fans toward a bracket side to form blades and simultaneously cut-raising protruding potions toward a rotor side to form protrusions. This design allows for both improvement in cooling efficiency of the alternating current generator and ease of manufacture of the fans.

Abstract: A rotor assembly for a turbine comprising a plurality of radially oriented, axially extending slots, each slot having a plurality of field windings seated therein; a sub-slot cover separating the windings from a base of the slot, thereby forming a coolant sub-slot radially inwardly of the windings; and an aerodynamic scoop fixed at an entrance to the sub-slot.

Abstract: A drive spindle is provided with an electric motor, an output shaft of which defines a tool-bearing spindle rotatable about a longitudinal axis, and with a cooling device for the electric motor; the cooling device having an impeller mounted for rotation about the longitudinal axis of the spindle so as to generate a substantially helical airflow coaxial of the spindle itself, and a static deflector for directing the airflow from the impeller towards the electric motor along a direction substantially parallel to the longitudinal axis of the spindle.

Abstract: An electrical machine, such as an electric motor, dynamo or alternator has a casing with cooling vents enabling cooling fluid to flow into and out of the casing when the rotor of the electrical machine rotates. The rotor may be formed from conductive elements connected together at their outer regions by interconnecting members, which have vanes arranged to direct cooling fluid over the outer regions. Each conductive element is a metal strip with legs bent in opposite directions relative to the plane of the strip. Portions of the windings of the rotor are spaced apart to allow fluid to flow between the windings to enhance the cooling effect. With a current carrying rotor, the magnetic field intensity across the rotor is varied by varying the axial separation of the rotor and the stator.

Abstract: A fan-motor-incorporated heat sink effectively supplies cooling air flow in a thin electronic device having limited space above the heat sink. The heat sink enables air intake above the heat sink by positioning a fan, the fins of a heat sink substrate and the side wall of the substrate lower than the fan driving unit. The heat sink substrate and the fins are formed such that air is exhausted only in one direction. A cover is provided on the side of the heat sink substrate on which the fan driving unit is mounted and to which air is taken in to prevent exhausted air from being taken in. The structure of the electronic device is positioned close to the upper surface of the fan driving unit on the heat sink. Thus, the heat sink can be installed on a thin electronic device while improving the cooling of a heat emitting element.