Abstract: A brush holder for a vehicle electrical machine having an insulating support, an electrical circuit including a semiconductor control component; and at least one metallic heat dissipation member in contact with the ambient environment and arranged to receive heat from the control component. The dissipation member is composed of two distinct parts, a seat and a dissipator. The seat is fixed to the support and receiving, on one of its faces, the control component and, on the other one of its faces, the dissipator.

Abstract: End windings of the field windings of a generator rotor body are flattened. A cap having a flat undersurface overlies the flattened end windings and an enclosure ring extends about the end windings and cap. Apertures are formed through the cap in communication with gaps between the coils of the end windings and passageways formed along the outer surface of the cap. The passageways and apertures form ventilation paths for a cooling medium flowing through the end windings outwardly into the air gap between the rotor body and stator.

Abstract: An end plate (1, 11) for a stator (31) wound with a cable in a rotating electric machine, the plate (1, 11) being provided with axially running winding slots (2) corresponding to the stator (31) and axially running apertures (19, 21, 22, 26) for cooling tubes corresponding to the stator (31), and that the plate (1, 11) is provided with at least one bending member (20, 23, 27) pre-shaped in the plate (1, 11) for cooling tubes (33) insertable into the cooling-tube apertures (19, 21, 22, 26) and also a procedure for supporting and protecting a cooling tube in a first axially running aperture at its exit from a stator in a rotating electric machine, whereby an end plate provided with bending members is applied at the end of the stator, the cooling tube being bent around the bending member before continuing, either by being fitted in a second axially running aperture in the stator or for extension out of the stator.

Abstract: An electrical machine has a stator, a rotor, and radially extending coolant passageways provided in a laminated core section of at least the stator. The coolant passageways are defined between axially spaced stacks of laminations in the laminated core section. The radial passageways are connected to coolant supply ducts through a gap between the stator and the rotor. More efficient cooling of the machine is obtained by providing a matrix of coolant duct sections extending circumferentially and axially of the core section. The matrix has first and second radially spaced apart faces respectively in fluid communication with the radially extending coolant passageways in the laminated core section and coolant exhaust ducts.

Abstract: The present invention relates to an electrical machine and more particularly to an arrangement of cooling passages within the stators of such machines. Cooling fluid is caused to pass through a number of channels provided in a space between winding discs to provide improved cooling of the winding discs.

Abstract: A ventilation pathway for a cooling gas to flow extends on a radial axis in a generator stator core. The ventilation pathway comprises at least two magnetic laminations and a plurality of space blocks extending radially in the generator stator core. The space blocks are fastened and disposed between the magnetic laminations. At least one of the space blocks includes a wavy longitudinal profile that includes an alternating pattern of peaks and valleys with respect to the radial axis of the generator stator core. Alternatively, at least one of the space blocks has a plurality of protrusions defining a pattern of peaks and valleys extending from a sidewall of the space block. Several different shapes of vortex generators are punched in the lamination are located within the ventilation pathway.

Abstract: The apparatus for cooling a high power electrical transformer and electrical motors uses thermally conductive material interleaved between the turn layers of a high power transformer and iron core laminates to provide a low resistant thermal path to ambient. The strips direct excess heat from within the interior to protrusions outside of the windings (and core) where forced air or thermally conductive potting compound extracts the heat. This technique provides for a significant reduction of weight and volume along with a substantial increase in the power density while operating at a modest elevated temperature above ambient.

Abstract: A gas cooled dynamoelectric machine is provided that is comprised of a rotor, a rotor winding comprising axially extending coils and concentric endwindings, and a plurality of spaceblocks located between adjacent endwindings thereby to define a plurality of cavities, each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns of the field endwinding region, at least one spaceblock has a trailing edge or downstream wall contoured to reduce generated wake. In a preferred embodiment, the trailing edge has an aerodynamic contour to reduce the extent and strength of the generated wake.

Abstract: An engine includes an engine body and a generator. The engine body has a stator bracket mounted to the cylinder block. The generator incorporates a rotor flywheel and an armature assembly consisting of armature legs. Various metal plates with high magnetic permeability make up the armature legs and are securely fastened in a radial manner to the similar plate made of aluminum. The stacked armature legs surround the crankshaft and are mounted to the stator bracket. The preferred heat conduction path travels from the armature legs through the aluminum plate on onto the stator bracket in order to improve the heat dissipation of the generator.

Abstract: A stator frame for an electric motor including a substantially cylindrical shaped body section having opposed ends, a cooling passageway extending through at least a portion of the body section, and at least one spacer bar. The cooling passageway includes a cooling conduit having an inlet port and an outlet port in flow communication with the cooling passageway. The spacer bar has a notched side and at least one finger extending therefrom such that the finger mechanically couples the spacer bar to the cooling conduit.

Abstract: A technique for enhancing heat transfer ventilation grooves is provided which allows the cooling groove dimensions to be minimizes while satisfying endwinding cooling requirements. Groove dimension may be minimized by including surface manifestations and/or selecting a non-linear groove configuration or shape to enhance heat transfer.

Abstract: A gas cooled dynamoelectric machine is provided that is comprised of a rotor, a rotor winding comprising axially extending coils and concentric endwindings, and a plurality of spaceblocks located between adjacent endwindings thereby to define a plurality of cavities, each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns of the field endwinding region, the downstream wall of at least one spaceblock is contoured to lower a suction pressure developed at the trailing edge of the spaceblock. In a preferred embodiment, the downstream wall of the spaceblock has a re-entrant contour to enhance the rotating cavity cooling flow.

Abstract: Generator stator cores are constructed by stacking many layers of magnetic laminations. Ventilation ducts may be inserted between these layers by inserting spacers into the core stack. The ventilation ducts allow for the passage of cooling gas through the core during operation. The spacers or spacer posts are positioned between groups of the magnetic laminations to define the ventilation ducts. The spacer posts are secured with longitudinal axes thereof substantially parallel to the core axis. With this structure, core tightness can be assured while maximizing ventilation duct cross section for gas flow and minimizing magnetic loss in the spacers.

Abstract: A winding structure of induction electric apparatus cooling disc windings within a cooling block evenly. With respect to a pair of cooling blocks including a cooling block A disposed upstream of axial insulating cylinder cooling flow of a blocking plate blocking a vertical cooling passage and another cooling block A disposed downstream of the axial insulating cylinder cooling flow of the blocking plate, a vertical guide cooling passage splits an outer vertical cooling passage into two parts. The vertical guide cooling passage includes a side face of the disc windings and a flow passage adjusting guide plate with the flow passage adjusting guide plate placed along the circumference of the disc windings with two ends facing the disc winding side, surrounding the disc windings disposed upstream of the axial insulating cylinder cooling flow of the blocking plate and the disc windings disposed downstream of the axial insulating cylinder cooling flow of the blocking plate.

Abstract: A ventilation pathway for a cooling gas to flow extends on a radial axis in a generator stator core. The ventilation pathway comprises at least two magnetic laminations and a plurality of space blocks extending radially in the generator stator core. The space blocks are fastened and disposed between the magnetic laminations. At least one of the space blocks includes a wavy longitudinal profile that includes an alternating pattern of peaks and valleys with respect to the radial axis of the generator stator core. Alternatively, at least one of the space blocks has a plurality of protrusions defining a pattern of peaks and valleys extending from a sidewall of the space block. Several different shapes of vortex generators are punched in the lamination are located within the ventilation pathway.

Abstract: A compact, self contained, heat dissipative, brushless motor assembly which has a stator fixedly mounted onto a hub. Located about the stator is a rotor with a shaft being connected to the rotor which is conducted through a center hole formed within the hub. A heat sink is attached to the hub. A controller is mounted on the heat sink with some of the heat generated by the controller to be dissipated by the heat sink. Rotation of the rotor causes rotation of a shaft which passes through the center through hole with this shaft to be optionally connectable to a planetary gear system. The planetary gear system is to be mounted within an alcove formed within the heat sink. The rotor includes a cover which includes a series of venting holes. The motor assembly is to be enclosed by a casing. Heat from the venting holes is to be conducted into the ambient through the casing.

Abstract: A stator of a rotating electrical machine has improved heat dissipation of a stator and end portions of a stator winding thereof which are protected from damage due to stress concentration, by inserting a silicone rubber sheet between a stator core having no slots and the stator winding which is accommodated thereinside. The silicone rubber sheet comprises a rubber type material having flexibility so as to be deformable under pressure, which is reinforced by a glass cloth or a polyester mesh cloth. Moreover, this is preferably an insulating and heat dissipating sheet which contains a filler having good thermal conductivity. More preferably, a silicone rubber sheet which contains boron nitride is used. Furthermore, a protective sheet of a resin material is further inserted between the stator core and end portions of the stator winding over the silicone rubber sheet.

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 ventilation pathway for a cooling gas to flow extends on a radial axis in a generator stator core. The ventilation pathway comprises at least two magnetic laminations and a plurality of space blocks extending radially in the generator stator core. The space blocks are fastened and disposed between the magnetic laminations. At least one of the space blocks includes a wavy longitudinal profile that includes an alternating pattern of peaks and valleys with respect to the radial axis of the generator stator core. Alternatively, at least one of the space blocks has a plurality of protrusions defining a pattern of peaks and valleys extending from a sidewall of the space block. Several different shapes of vortex generators are punched in the lamination are located within the ventilation pathway.

Abstract: A gas cooled dynamoelectric machine is provided that is comprised of a rotor, a rotor winding comprising axially extending coils and concentric endwindings, and a plurality of spaceblocks located between adjacent endwindings thereby to define a plurality of cavities, each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns of the field endwinding region, at least one scoop structure is provided adjacent the radially inner end of a cavity facing surface of at least one spaceblock for intercepting and redirecting coolant flow into the respective cavity. The spaceblock itself may have curved upstream and/or downstream surfaces for facilitating circulating coolant flow.

Abstract: A gas cooled dynamoelectric machine is provided that is comprised of a rotor, a rotor winding comprising axially extending coils and concentric endwindings, and a plurality of spaceblocks located between adjacent endwindings thereby to define a plurality of cavities, each bounded by adjacent spaceblocks and adjacent endwindings. To enhance the heat transfer rate from the copper end turns of the field endwinding region, at least one flow deflector structure is provided on a cavity facing surface of at least one spaceblock for intercepting and redirecting circulating coolant flow towards a central region of the respective cavity.

Abstract: Coil ends (19) of a stator coil (18) having a cross sectional shape like a flat rectangular are constructed by first portions extending from an outer layer of a pair of slots apart from predetermined pitches in an axial direction and slanting in a circumferential direction, second portions extending from an inner layer of the other of the pair of the slots in the axial direction and slanting in the circumferential direction, and third portions positioned at ends of the coil ends (19) in the axial directions, elongated in the radial direction and connected to ends of the first and second portions in the axial direction, and in all of the first, second and third portions, long sides (300) of the cross sectional flat rectangular view of the stator coil (18) are arranged to be substantially in parallel with an end surface of the stator whereby the coil ends are lowered; and the coils are arranged without a gap.

Abstract: A ventilation pathway for a cooling gas to flow extends on a radial axis in a generator stator core. The ventilation pathway comprises at least two magnetic laminations and a plurality of space blocks extending radially in the generator stator core. The space blocks are fastened and disposed between the magnetic laminations. At least one of the space blocks includes a wavy longitudinal profile that includes an alternating pattern of peaks and valleys with respect to the radial axis of the generator stator core. Alternatively, at least one of the space blocks has a plurality of protrusions defining a pattern of peaks and valleys extending from a sidewall of the space block. Several different shapes of vortex generators are punched in the lamination are located within the ventilation pathway.

Abstract: A gas cooled dynamoelectric machine is provided that includes a rotor having a body portion, axially extending coils, endwindings, and a plurality of spaceblocks disposed between the endwindings, so that a plurality of cavities are defined between mutually adjacent endwindings and spaceblocks. To increase endwinding cooling, at least one of the spaceblocks has a passage extending between first and second adjacent cavities to provide for cooling flow communication between the first and second cavities through the spaceblock. A flow deflector is preferably provided adjacent a radially inner end of one, the other, or both of the cavity facing surfaces of the spaceblock for directing flow into or out of the first and second cavities, respectively.

Abstract: An electrical machine formed as a fluid-cooled three-phase alternating current generator has a cup-shaped housing, a stator arranged in the housing, a drive system, a shaft driven by the drive system, a claw pole rotor system mounted on the shaft, the claw pole rotor system including a first pole ring which is mounted on the shaft, formed as a pole wheel half and runs in claws, and a second pole ring which is formed as a pole wheel half and runs also in claws, so that tips of the claws of one of the pole rings extend in gaps between the claws of the other pole ring, pole rings producing a cooling air stream in the housing for withdrawing heat which is generated in the machine by convection through an outer casing of the housing to fluid medium which surrounds the housing, a plurality of substantially radially extending blower vanes formed on substantially flat end side of a respective one of the pole rings which is located at a side opposite to the drive system, and a ring chamber closing the blower vanes in

Abstract: A stator for a high voltage generator has cable windings that are radially inserted into the stator slots. The stator is assembled as the cable windings are laid into the stator slots. The stator slots are left wide open to allow the cable windings and separator bars to be inserted in the slot as the stator is assembled. The open slots have sidewalls that are defined by stator teeth, which extend radially out from a rotor jig in the stator. As each coil section is laid in a slot, a separator bar is inserted over the coil so that another coil section can be laid into the stator. The coils are stacked in a slot and sandwiched between separator bars also in the slot. The separator bar is keyed to the sidewalls of the teeth to provide structural support for the cable windings.

Abstract: An AC generator comprises a rotor 25 within a stator 24. The rotor carries a fan 27 at one end of the stator. The fan 27 is within a casing 30 which forms volume discharge passages 32. The fan 27 has blades 31 which project from the hub 28 at an angle which is oblique to the radial whereby those blades 31 trail the radial. The stator windings 23 form terminal leads 34 which are led from the end of the stator 24 remote from the fan 27. A circumferential array of cleats 35 which each have the form of a comb, support and guide the terminal leads 34 circumferentially, spaced from one another, to a certain location at the top from which the leads are taken and connected to terminals above. Those terminals are formed by the lower ends of busbars (56 to 58, 61 to 69) which extend through and which are supported by a structural panel of insulating material which forms an insulating barrier between the ends of those busbars.

Abstract: A method and apparatus are provided for cooling a current carrying coil and a specialized coil is provided for use in such method and apparatus. The coil has openings formed therein between at least selected internal wires of the coil in at least one non-working region along the coil. Such openings may for example extend through the coil in a direction substantially perpendicular to the plane of the coil or substantially parallel to such plane. A heat sink is provided in each such opening which heat sink may be a fluid in the opening, which fluid is preferably flowing through the opening. The fluid may be a gas such as air or a liquid such as oil or water. Alternatively, the heat sink may be a comb formed of a material having good heat conduction characteristics, which comb has a plurality of fingers which pass through corresponding openings in a region of a coil and a backbone or block through which heat may be removed from the fingers.

Abstract: In an automotive alternator, a thick-walled guide portion for guiding external air from an opening towards a heat sink main body is formed opposite fins on part of an outer circumferential portion of a bearing housing portion of a rear bracket.

Abstract: A gas-fired forced draft air heating furnace is provided with a specially designed self-cooling draft inducer fan that overlies an inshot-type burner section of the furnace and is operatively supported on a heat exchanger plenum portion of the furnace housing. The fan motor is supported on an outboard housing side of the fan, and an umbrella cooling fan is coaxially secured to an outboard end of the fan drive shaft. During operation of the draft inducer fan, the umbrella fan is rotationally driven to direct a flow of ambient cooling air toward the outboard side of the draft inducer fan housing in a manner causing the air flow to sequentially contact and cool the outer shaft end bearing area, the motor windings and the inner shaft end bearing area at the outer side of the draft inducer fan housing.

Abstract: An end turn arrangement for turns in a rotor where individual windings are stacked in tapered radial slots in the rotor, with successive turns having a smaller width in a radial inward direction, the end turns of the individual turns of each stack being vertically aligned along a common edge. The end turns are separated by blocking separators, each including a first anchor component having a first planar exterior surface and a second planar interior engagement surface; and a second slide component having a first non-planar exterior surface and a second planar interior engagement surface; the anchor and slide components having mating guide elements permitting the anchor and slide components to move relative to each other along a straight assembly path.

Abstract: A segmented stator end turn air deflector for an electric motor having a stator and a rotor. The stator has a plurality of stator coils with end turns and a plurality of air passages extending longitudinally through the stator. A frame having an inlet end and an outlet end surrounds the stator. The rotor is rotatably mounted inside the stator and the frame. Brackets are coupled adjacent to the outlet end of the frame in a circular orientation. An air baffle assembly is coupled with respect to the stator adjacent to the outlet end and extending between, but out of contact with, the frame and ends of the coils for the purpose of directing any air flowing from the air passages onto the end turns. The air baffle assembly includes a plurality of arcuate segments each coupled to a respective one of the brackets. The air baffle assembly further has a radially interior arcuate end and a radially exterior arcuate end and angularly oriented side edges which converge inwardly.

Abstract: The thermal protection device comprises, for at least one elastomeric component of a rotor, at least one element which is fitted onto the rotor so as to reduce heat exchange between the elastomeric component and the ambient air. The element may be thermally insulating and may include at least one layer of a thermal insulation material and means for fitting it onto a metal reinforcement of the elastomeric component so as to cover its free surfaces, which are exposed to the ambient air, and/or at least one deflector sheltering, at least partially, a laminated part of the elastomeric component from the relative wind in order to reduce forced convection.

Abstract: Losses in efficiency of operation of a dynamoelectric machine as a result of eddy current losses and poor coolant efficiency and/or disruption of the magnetic circuit in a rotor by coolant passages is avoided in a dynamoelectric machine including a stator (18) in which a rotor (16) is journaled. The rotor includes a stack (16) of thin laminations (17) made of a ferromagnetic material to define a rotor body. The rotor body includes a plurality of equally angularly spaced poles (58) separated by recesses (64). Coolant passages (76) located in the rotor at or just radially inward of the base (72) of each pole (58) and substantially radially outward of the rotational axis (56) of the rotor (14) to maximize cooling efficiency of the poles (58) without disrupting the magnetic circuit in the rotor. Slots (80) are placed in the tips (70) of the poles (58) of selected laminations (17) and extend generally radially inward to reduce eddy current losses.

Abstract: A power tool is provided and includes a tool housing having interior and exterior surfaces and inlet and outlet air vents and a motor disposed in the tool housing and having a motor housing with an external surface and inlet air ports for the passage of cooling air into the motor and outlet air ports for passage of warmed exhaust air from the motor. The inlet and outlet air ports open at the external surface and the outlet air ports are spaced from the inlet air ports. The tool also includes an air deflector resiliently coupled to the external surface. The air deflector includes wall structures bracketing the outlet air ports. The structures have portions extending to and contacting the interior surface of the tool housing and bracketing the outlet air vents to form a barrier around the outlet air ports and vents to channel exhaust air to the outlet vents and substantially inhibit exhaust air from the outlet air ports from entering the inlet air ports or other portions of the tool.

Abstract: A spacing member for use with an alternator of the type having an electrical generating assembly housed in a frame with an external mounting surface to which a voltage regulator is adapted to be mounted. A brush assembly is connected to the voltage regulator and has a pair of brushes adapted to engage a pair of slip rings of the electric generating assembly when the brush assembly is positioned in a slip ring engaging position, the spacing member supports the voltage regulator in a spaced apart relationship relative to the mounting surface of the frame so as to provide an air flow passage between the voltage regulator and the mounting surface for enhancing heat transfer away from the voltage regulator and the spacing member supports the voltage regulator in a spaced apart relationship relative to the brush assembly so as to support the brush assembly in the slip ring engaging position.

Abstract: An alternator for a vehicle which maintains or improves the cooling performance and which reduces the fan noise caused by the interference between the cooling winds and the stator windings. An armature coil provided on a stator of the alternator includes an X-phase coil group, a Y-phase coil group, and a Z-phase coil group. Coil end groups are sets of coil ends forming bridge wires between slots. The coil end groups have stationary blade shapes which form passages for the cooling winds directed from a cooling fan on a rotor toward outlets in a frame. The sound of the interference between the cooling winds and the coil end groups is reduced while the cooling performance is enhanced.

Abstract: A spacing member for use with an alternator of the type having an electrical generating assembly housed in a frame with an external mounting surface to which a voltage regulator is adapted to be mounted. A brush assembly is connected to the voltage regulator and has a pair of brushes adapted to engage a pair of slip rings of the electric generating assembly when the brush assembly is positioned in a slip ring engaging position, the spacing member supports the voltage regulator in a spaced apart relationship relative to the mounting surface of the frame so as to provide an air flow passage between the voltage regulator and the mounting surface for enhancing heat transfer away from the voltage regulator and the spacing member supports the voltage regulator in a spaced apart relationship relative to the brush assembly so as to support the brush assembly in the slip ring engaging position.

Abstract: An electric motor of the type used to power submersible pumps is disclosed. An interior cavity of the motor is filled with one or more liquids for cooling and/or lubricating the motor interior. A system for circulating the fill liquid within the motor cavity comprising a rotatable cup spacer attached to the motor shaft and liquid passageways is described.

Abstract: This apparatus is directed to reduction in emitted windage sound in dynamoelectric machines by detuning cavities formed in the ventilation spaces of the machine.

Abstract: A process for repairing leaks in turbine generators that have water cooled stator coils with hollow conductor strands, wherein the lead ends of the conductor strands are joined to a header. First a vacuum enclosure is provided around a portion of one of the stator coils in proximity to the header. Then a vacuum is applied to the portion. Finally, a resin is injected into voids in the portion. In a second embodiment, the header first is cut into an outboard section, and into an inboard section that remains attached to the conductor strands. Then the exposed lead ends of the conductor strands and the attached inboard section are cleaned to remove oxidation. Next, a water-tight braze seal is applied over the lead ends of the conductor strands. Then the stator coil and the inboard section are joined to a new outboard section and a vacuum is subsequently applied to the inboard section. The resin is then injected into voids in the inboard section.

Abstract: In a dynamoelectric machine stator core assembly wherein adjacent packages of stacked laminations are separated by a plurality of radially extending spacer blocks, and wherein each adjacent pair of spacer blocks define in cooperation with adjacent axially spaced laminations, a cooling duct, the improvement comprising a plurality of turbulator elements in each cooling duct, each turbulator element extending into the duct from one of the adjacent axially spaced laminations.

Abstract: A cooling vane for a rotating electric machine and method for attachment. In one embodiment the cooling vane is a corrugated ribbon of thermally conductive material having a plurality of projection points positioned along one edge of the corrugated ribbon. In another embodiment the vane is periodically twisted to bring a portion of the vane parallel with the plate to which the vane is to be welded. In one embodiment the cooling vane is welded to a stator plate of the machine by positioning the cooling vane perpendicularly adjacent the grounded stator plate and applying a high current source to the cooling vane in the region of the projection point. The high current flow through the projection point welds the cooling vane to the stator plate. A plurality of these cooling vanes are welded to the stator plate radially around the surface of the plate to provide a large surface area and to turbulate the fluid flow for the dissipation of heat which is generated within the machine during operation.

Abstract: In the bulb-type generator, the stator laminated body (2) is suspended on the housing ring (1) by means of V-shaped elements (14). The housing ring is reinforced by the V-shaped elements. Air or cooling water can be directed for cooling purposes to the cavities (18) produced by the V-shaped elements (14) and the inner wall of the housing ring (1). In this way, a portion of the lost heat is already dissipated over flowing water when passing over the cold housing wall enlarged by the V-shaped elements (14).

Abstract: Disclosed herein is a modular motor comprising a discoidal stator unit and a discoidal rotor unit rotatable about an axis of rotation under a torque established therein, the stator unit being supported by a frame arrangement and having a winding assembly within in a matrix of polymer material, the winding assembly including a number of winding elements, each of the winding elements having a pair of radially disposed portions, wherein at least one of the radially disposed portions of each winding element is spaced from a radially disposed portion of another winding element to form a cooling region therein, the cooling region being arranged for the location therein of thermally conductive materials having a thermal conductance of at least 1.5 w.multidot.cm/(cm.sup.2 .multidot..degree. C.), thereby to transfer heat from the stator unit and toward the frame arrangement during operation of the motor.

Abstract: In a small starter motor which has a substantially closed space therein, it is necessary to blow out brush dust particles therefrom. On a coil end surface or both coil end surfaces of an armature, a fan generating an air circulation is formed utilizing gaps formed between individual coil ends on the surface without adding any other parts. Also, a side wall is disposed next to the coil end surface in parallel thereto which closes an axial end of a yoke in which the armature is coaxially disposed. In the space formed between the side wall and the coil end surface, an air circulation is generated when the armature rotates. The side wall has an air inlet hole and the yoke has an air outlet hole. Air coming into the space from the air inlet hole is blown out from the air outlet hole by the circulation generated by the fan made on the coil end surface. The brush dust particles are blown out by the circulated air, and the coil ends are cooled off at the same time.

Abstract: A stator insulating bobbin is disclosed including a plurality of insulating elements. These insulating elements are configured and dimensioned to substantially enclose and insulate an inner surface of a stator assembly. Each of the insulating elements includes a first flange portion and a second flange portion joined by an intermediate web portion.

Abstract: An electromechanical transducer, such as a motor (1), comprising a rotor member (4), a stator member (3) having an electrical winding (8), and isolating means (11, 9, 16, 12) isolating at least a part (18) of one of the members (3) from the other member (4), and cooling fluid in direct contact with said part (18) and isolated from the other member (4). The stator member (3) is preferably cooled by pumping liquid past it, whilst the rotor member (4) is isolated from the liquid. The rotor member (4) preferably operates in an evacuated chamber (48). A pump (5) is preferably provided to pump the cooling liquid around a cooling circuit (47, 6, 5, 47, 42).

Abstract: Cooling of the rotor endwindings in a dynamoelectric machine is improved by providing radially-extending ducts in the spacers located between the concentric end turns of the rotor winding. The ducts have an inlet located near the radially inward end of the spacer and an outlet located near the radially outward end of the spacer. The inlet can be formed on either an axially-oriented surface of the spacer or a circumferentially-oriented surface of the spacer. The ducts direct cooling air into the cavities between the end turns in such a manner that the circulation velocity in the cavities is increased. This results in increased heat removal capability.

Abstract: An improved construction of a .?.Randel.!. .Iadd.Lundell.Iaddend.-type rotor of a vehicle-mounted alternator, capable of reducing the windage noise which is produced as a result of interference between the rotor and the stator of the alternator. The rotor has a pair of pole cores provided with a plurality of mutually meshing claws, and an exciting coil disposed at the inner side of the pole cores. Spacers in the form of an integral ring or discrete wedges are fitted in the spaces between adjacent pole core claws so as to provide a substantially smooth cylindrical outer peripheral surface of the rotor portion facing the radial teeth on the stator.