Abstract: Electrical machine, in particular AC generator, having a stator (16) and a rotor (20), wherein the rotor (20) has a conductor arrangement for exciting an electromagnetic field, having a device for transmitting electrical energy to the conductor arrangement, wherein the device for transmitting electrical energy comprises at least one sliding contact and at least one mating contact (66) which is fixed to the rotor, having a fitting sleeve (63) in which a roller bearing (28) for supporting a shaft (27) is preferably arranged, said shaft for the most part encasing the at least one mating contact (66) which is fixed to the rotor, wherein a fan (70) is arranged in the fitting sleeve (63).

Abstract: The present invention relates to a slip ring assembly for providing electricity to or from a rotor rotating in relation to a stator in a generator or an electrical motor. The slip ring unit rotates around a centre axis and has at least one first slip ring with an outer surface, a diameter, and a width. Also, the assembly comprises at least one conductive means, such as a brush, having conductive contact with the surface of the slip ring, and a housing in which the slip ring unit and the conductive means are situated. Furthermore, the assembly has a suction means in connection with the housing for suction of gas from within the housing out through a suction outlet in the housing. In addition, the housing has a suction inlet which is connected with a guiding means. The guiding means has an aperture facing the slip ring surface, and the aperture is positioned at a predetermined distance from the surface of the slip ring so that the gas is able to cool the surface of the slip ring.

Abstract: An electric motor (1) comprises a casing (2), a stator housed in the casing (2), a sealing cover (10), a rotor (6) rotatable inside the casing (2) and equipped with a commutator (7), a circuit (8) for powering the commutator (7) comprising two brushes (15) in sliding contact with the commutator (7); the motor (1) comprises two brush holder sleeves (14) in which the brushes (15) slide and two springs (17) operating between the brush holder sleeves (14) and the respective brushes (15) in such a way as to push the latter towards the commutator (7); both the sleeves (14) and the springs (17) form part of the circuit (8) for powering the brushes (15).

Abstract: The electric rotating machine includes a rotor, a stator having a stator core and a stator winding wound on the stator core, and a cooling liquid feeding function of applying cooling liquid to the coil end of the stator winding. The stator winding constituted by coils wound along the circumferential direction includes crossover portions each of which electrically connects the ends of two of the coils through which currents in the same phase flow, respectively. The crossover portions are arranged so as to overlap one another only partially in the circumferential direction. The cooling liquid feeding function applies the cooling liquid to at least one of the crossover portions.

Abstract: There is described an electrical machine with a rotor shaft, a slip ring, arranged on the rotor shaft, and at least two sliding contacts arranged along the circumference of the slip ring for producing an electrical connection with the slip ring. The electrical machine has one or more extraction devices arranged between the at least two sliding contacts directly via the slip ring and intended for extracting abraded material produced at the slip ring.

Abstract: A carbon brush holder with improved air vents includes a body, a housing, and an exhaust lid, which are provided with corresponding fixing structures for their convenient assembly or disassembly. The exhaust lid is formed with a diverging air channel. By the exquisite configurations of the fixing structures provided on its components, the carbon brush holder is easy to assemble and disassemble so as to facilitate replacement or repair of parts settled in the carbon brush holder. Besides, since the exhaust lid in the present invention has the diverging air channel opened at two sides thereof as the air vents, it significantly improves the efficiency in dust expelling and heat dissipating, thereby effectively preventing the air vent from blocked and preventing overheat caused by poor exhaust.

Abstract: An electric machine comprises: a casing (2); a stator (3) and a rotor (4) supported by the casing (2), the rotor (4) having at least one rotor winding (7); a commutator (9) connected permanently to the rotor (4) and electrically connected to the rotor winding (7); a pair of brushes (12), each having a first end (12a) maintained in a sliding position with the commutator (9) and electrically connected to respective terminals which may be connected to an electricity mains supply; a pair of brush holder elements (11) supported by the casing (2), each brush holder element (11) being associated with a respective brush (12) to keep it pressed on the commutator (9). Each brush holder element (11) has at least one lateral surface (18) to face a respective butting position (17) of the casing (2), and which may be joined to the butting portion (17) to transmit a thermal power to the butting portion.

Abstract: A high speed electric motor for use in a variety of applications. The electric motor an electric motor including a motor housing or stator, a rotor having a commutator and brushes for contacting the commutator at a predefined area known as the contact area. Additionally, the motor includes a forced air cooling assembly. The forced air cooling assembly includes a centrifugal fan for creating air flow, a manifold for accelerating the air flow. The manifold having exit ports and the exit ports being positioned directly over the contact area for directing the accelerated air flow at the contact area and the motor housing having at least one opening aligned with the contact area and at least a second opening defining an exit vent. Additionally, a method of cooling the motor in accordance with the invention is also disclosed.

Abstract: An electric motor has a stator and a rotor. The stator has a housing with inlets and outlets. The rotor has a shaft, a rotor core and a commutator. A fan is fixed to the rotor. An end cap is fitted to the housing to close a first end of the housing and support electrical components, including brush gear. The brush gear includes two brush assemblies, each comprising a brush for making sliding electrical contact with the commutator and a brush guidance mechanism for resiliently urging the brush into contact with the commutator. The brush assemblies are accommodated in compartments of the end cap. Each compartment has vents on an axially facing side thereof and openings in a transverse wall thereof. An air guide guides a part of the airflow generated by the fan exiting from at least one of the outlets of the housing to flow into the compartments via the openings and exit the compartments via the vents to cool the brushes.

Abstract: An alternator for vehicles, the alternator being provided with a rotary shaft, comprising slip rings fixed to a rotary shaft to be rotated with the rotary shaft, brushes being placed to be in slide contact with the slip rings a brush holder that accommodates the brushes to be held therein; connection terminals fixed to the brush holder, brush leads electrically connecting the brushes to the connection terminals respectively, and a slip ring cover that covers the slip rings in cooperation with the brush holder, wherein the brush holder comprises first chambers in which the bushes are fixedly accommodated second chambers in which the brush leads are accommodated, the second combers communicating with the first chambers, and first air holes formed to open outside of the housing and formed as inlet/exhaust passages communicating with the second chambers.

Abstract: A drive device has a gear unit having a gear shaft and a motor unit having a motor shaft drivingly connected to the gear shaft. At least one cooling unit is arranged within the drive device for dissipating thermal losses. The cooling unit can be arranged in the gear unit or between the gear unit and the motor unit. For example, the cooling unit has at least one fan that can be arranged in a coupling unit between the gear unit and the motor unit. Instead of or in addition to the fan, a cooling liquid flowing through a flow chamber can be used.

Abstract: A rotating electric machine includes an end bracket; a commutator; a brush holder stay with a first end surface and a second end surface, wherein the first end surface is covered by the end bracket; a brush holder provided at the second end surface of the brush holder stay; a brush that is equipped in the brush holder and slidably contacts with the commutator; and a heat transfer medium for transferring heat of the brush is provided between the end bracket and the brush holder stay.

Abstract: An alternator for a vehicle is disclosed as having front and rear frames supporting a stator having a stator winding, a rotor fixedly carried on a rotary shaft and rotatably disposed inside the stator while having a field winding, a bush unit accommodating brushes held in sliding contact with slip rings formed on the rotary shaft, and a brush-wear particle collecting section for collecting brush-wear particles resulting from sliding contact between the brushes and the slip rings. In one embodiment, the bush unit includes a bush holder holding the bushes and a sealing plate member having the brush-wear particle collecting section. In another embodiment, the rear frame carries a protective cover formed with the brush-wear particle collecting section. In a further embodiment, the rotary shaft carries thereon brush-cooling means formed adjacent to the slip rings for creating an air stream to cool the brushes.

Abstract: Method for retrofitting an electric machine to reduce temperature rise therein. The method allows for removing at least a portion of an originally assembled coil support on a spider structure of the machine. The originally assembled coil support is configured to allow only axial flow to cooling air from a plurality of cooling vents in the armature of the machine. The method further allows for mounting a new coil support on the spider structure. The new coil support is configured to provide axial and radial routing to cooling air passing from the plurality of cooling vents. The air routed radially by the new coil support passes proximate the coil end turns and enables a reduction of temperature rise in the machine.

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: In a rotary joint A including an electric signal slip ring 31 for passing different electric signals between a stator 1 and a rotor 6, for the purpose of stable transmission of electric signals in the electric signal slip ring 31, stationary side electrode stacks 38a and 38b are provided individually by stacking each pair of axially adjacent two 36b to 36e of six ring-plate-shaped stationary side electrodes 36a to 36f arranged concentrically with the axis of the stator 1 and aligned axially with each other together with one of stationary side insulating seats 37a and 37b interposed between the pair of axially faced stationary side electrodes, rotating side electrode stacks 42a to 42c are provided individually by stacking each pair of axially adjacent two 40a to 40f of six ring-plate-shaped rotating side electrodes 40a to 40f arranged concentrically with the axis of the rotor 6 and aligned axially with each other together with one of rotating side insulating seats 41a and 41c interposed between the pair of axi

Abstract: An electrical current collector system has an electrically conductive slip ring mounted to a rotatable shaft and a fixed conducting ring assembly forming a partially enclosed AC high voltage electrical current conductive ring channel in which slip ring contacting members are mounted. A compartment at ground potential at least partially encloses the slip ring and the fixed conducting ring assembly. A source directs a fluid into the compartment so that the fluid travels through into the conductive ring channel to perform at least one of cooling and cleaning of the slip ring contacting members. A hollow conically shaped insulator has a frustum with a narrower cross-sectional opening connected to the conductive ring channel and a larger diameter cross-sectional portion passing through and connected to the compartment for exhausting the fluid from the current conductive ring channel.

Abstract: An AC generator for a vehicle has a brush unit. The brush unit comprises a brush held in sliding contact with a slip ring, a spring for pressing the brush, a brush holder having a portion for receiving the brush, and a slip ring cover for covering the outer periphery of the slip ring formed on a rotary shaft. The slip ring cover includes a first wall portion and a second wall portion which are generally shaped like an arc, a cover portion for closing the end portion in the axial direction, and a side wall portion. The first wall portion and the second wall portion overlaps each other, and a suction/discharge port is formed between these wall portions.

Abstract: The present invention generally provides a motor-fan unit including a motor assembly having a shaft, a commutator supported on the shaft, and a pair of brushes in electrical contact with the commutator, a fan assembly having an impeller coupled to the shaft, an end plate assembly located between the impeller and the motor assembly, said end plate assembly including a plate portion defining an opening throughwhich the shaft passes, wherein said commutator is located near the opening, and a pair of brush retainers adapted to receive the brushes formed on the plate portion adjacent said commutator, the brush retainers opening toward the fan assembly.

Abstract: The invention relates to a rotating electrical machine with a contacting device whose circumference has at least one slide contact disposed on it, which remains in sliding contact with a brush apparatus (slide system), in which the at least one slide contact is comprises of a wear resistant material. The invention provides that the electrical machine has an internal cooling system in which a fluid/gas mixture used as a cooling medium circulates around the components to be cooled, including the slide system, and the at least one slide contact is comprises of an alloy with at least one alloy component that has an affinity for oxygen.

Abstract: An engine cooling module includes a shroud structure 12. A housing 20 of a d.c. electric motor is formed integrally with the shroud structure 12. The housing has an open end 21. The motor has a drive shaft 26. A heat sink 22 is disposed opposite the open end and is insert molded with respect to the housing 20. The heat sink 22 defines a seat for a bearing 24 supporting the shaft 26. A flux ring assembly 48 is insert molded with respect to the housing. The flux ring assembly includes permanent magnets 33. An armature assembly 28 is disposed in the housing and fixed to the shaft for rotation in response to a magnetic field generated by the magnets 33. A commutator 32 is disposed in the housing and electrically connected with the armature assembly 28 and mounted for movement with the armature assembly. A brush card assembly 36 is coupled to the open end 21 of the housing to define an end cap covering the open end. The brush card assembly 36 has brushes 42 associated with the commutator 32.

Abstract: An electrical current collector system (20) comprises an electrically conductive slip ring (27) mounted to a rotatable shaft (28), as well as a fixed conducting ring assembly (44) having slip ring-contacting members (240, 404) mounted thereon. The slip ring (27) and fixed conducting ring assembly (44) are mounted to have an annular gap (48) formed therebetween. A slip ring support assembly (42) comprising plural post insulators (102) spaced radially about the rotatable shaft attaches the conductive slip ring to the rotatable shaft. The slip ring and fixed conducting ring assembly are at least partially enclosed in a compartment (57), to which a source (302) applies a cooling/cleaning fluid. In accordance with the structure and method of the invention, the source directs the fluid over at least some of the post insulators for cleaning of the post insulators.

Abstract: An electrical current collector system (20) comprises an electrically conductive slip ring (27) mounted to a rotatable shaft (28), as well as a fixed conducting ring assembly (44) having slip ring-contacting members (240, 404) mounted thereon. The slip ring (27) and fixed conducting ring assembly (44) are mounted to have an annular gap (48) formed therebetween. A slip ring support assembly (42) comprising plural post insulators (102) spaced radially about the rotatable shaft attaches the conductive slip ring to the rotatable shaft. The slip ring and fixed conducting ring assembly are at least partially enclosed in a compartment (57), to which a source (302) applies a cooling/cleaning fluid. In accordance with the structure and method of the invention, the source directs the fluid over at least some of the post insulators for cleaning of the post insulators.

Abstract: An electrical machine, such as an electric motor, dynamo or alternator has a casing (26) with cooling vents (64) enabling cooling fluid (F) to flow into and out of the casing when the rotor (10) of the electrical machine rotates. The rotor (10) may be formed from conductive elements (44) connected together at their outer regions by inter-connecting members (40) which have vanes (68, 70) arranged to direct cooling fluid over the outer regions. Each conductive element (44) is a metal strip (45) with legs (46, 48) bent in opposite directions (D.sub.1, D.sub.2) relative to the plane of the strip. Portions of the windings (28, 30) of the rotor (10) 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 (74, 76).

Abstract: An electrical machine has a stator, and a rotor defining an axis of rotation, the stator including laminations located along that axis, the laminations having protrusions, the protrusions on each lamination being circularly spaced apart about the axis to define cooling air flow passages, and a fan mounted on the rotor to effect flow of cooling air into and through such passages as the rotor rotates.

Abstract: An improved method for the manufacture of a compact brush guide holder assembly which is commonly found on machines in which electricity is to be transferred between an electrically conductive brush element as it moves and makes contact with a rotatable conductor such as a commutator. The brush holder assembly constructed of material that reduces antifrictional forces having a guiding channel or chamber defined by upper and lower curvilinear surface for supporting the electrically conductive brush element which receives compressed tension from a fixed non-removable constant force spring which is composed of a beam uncoiled section in addition to a coiled section having integrally fixed mounted Teflon bushings that are free to ride and float horizontally and vertically on mounting post that pass through its center.

Abstract: An arrangement for the transfer of electric current, a liquid medium and a gaseous medium between fixed and rotatable sections. A protective casing surrounds sliding brushes pressing against sliding surfaces. A passage for each medium is parallel with rotation and arranged at a boundary surface between the fixed and rotating sections. Passage transfer pipes in both sections communicate with the passages. A collector chamber arranged in the fixed section and an outlet pipe lead the gaseous medium out of the tubular rotating section. The arrangement for the transfer of a liquid medium is coaxially arranged inside the arrangement for the transfer of electric current. The protective casing provides a collector chamber for the gaseous medium.

Abstract: The commutator segments for a d.c. electric motor includes one or plurality of slots which improves horsepower at less amperage.

Abstract: Disclosed is an improvement to the stability of D.C. motor brushes mounted in brush boxes with wings is improved by angling the wings toward the commutator such that the brush spring contacts the brush at one or more points intermediate the ends of the brush. Improved cooling is provided by utilizing an end plate with apertures and a brush plate which in combination with the commutator, provides a brush plate aperture for cooling air flow. In a preferred embodiment, speed variations of the motor can be achieved by selectively disconnecting one or more brushes in a four brush embodiment reducing the torque and rotating speed of the motor. In a preferred embodiment, the use of a diode to interconnect same polarity brushes permits a speed change to be accomplished by selectively connecting one or the other end of the diode.

Abstract: A motor-generator set stator core includes a plurality of flat thin annular winding support plates, a pair of improved annular end plates, and a plurality of elongated flat attachment members for retaining the end plates and support plates assembled together. The improved annular end plates have substantially right triangular configurations in cross-section which are the reverse or a mirror image of one another. At hypotenuses of the right triangular cross-sections of the end plates are inner surfaces which have tapered or conical configurations that are the reverse of one another so as to conform to the outside tapered profile of the end turns of the stator windings. At short sides of the right triangular cross-sections of the end plates are radial planar surfaces which engage the opposite outer side portions of the stacked support plates.

Abstract: A brush cooling system for a direct current electric motor of the type having a housing with an air inlet at one end for admitting forced cooling air to the motor and brushes located at an end of the motor distal from the air inlet, includes at least one air duct extending from the air inlet end of the motor through a space defined by adjacent stator windings of the motor and terminating at about an end of the windings opposite the air inlet end. A convergent nozzle is releasably connected to the terminating end of the air duct and extends from the air duct to an area generally adjacent the motor brushes for directing cooling air from the duct onto the brushes. Field coils of the stator windings are separated by air spaces and the air ducts extend through the air spaces between field coils. Each air space not including an air duct is substantially blocked by a baffle inserted in the space for inhibiting air flow through the air space.

Abstract: A commutator type, prior art dynamoelectric machine normally has an inlet for cooling air at the end of the machine remote from the commutator. The air flows from the inlet through axially extending passages in the rotor, outwardly through spaced radial ducts in the rotor, and into the air gap. Part of the air flows through the air gap to a collecting chamber at the commutator end of the machine to be discharged or exhausted. Part of the air flows radially outwards through interpolar spaces in the stator, through cooling ducts in the magnet frame to a peripheral passage which is connected to the collecting chamber at the commutator end. This invention provides a second collecting chamber at the drive end of the machine opposite the commutator end, communicating with the air gap and also with the peripheral passage at the drive end. Thus the air flow is divided after passing through the rotor and flows to the nearer collecting chamber providing a shorter flow path.

Abstract: A current collecting brush box assembly for a homopolar generator wherein the assembly includes a high electrical and thermal conductivity, low weight controlled porosity metallic foam for heat transfer and current conduction purposes as well as for direct contact with the rotor of the homopolar generator.

Abstract: There is provided a totally enclosed electric motor which is effectively cooled by means of an internal ventilation system and an external ventilation system. The internal ventilation system includes an internal fan driven by the rotor which forces internal ventilating air into and along an annular series of longitudinal internal ducts arranged adjacent to the internal cylindrical wall supporting the stator. The internal ventilating air leaving the internal ducts enters a brush compartment where the air is directed axially over the commutator and through the stator-rotor arrangement and back to the internal fan. The external ventilation system includes an external fan driven by the rotor which forces external ventilating air from the atmosphere into and along an annular series of longitudinal external ducts arranged radially outwardly from the series of internal ducts and into exhaust compartments at the far axial end of the motor.

Abstract: A fan assembly that includes an impeller driven by an electric motor. The housing for the impeller has an air intake opening and a pressure-side connection for the discharge of air, with the pressure-side connection being provided with an air inlet opening that communicates with an air conduit that in turn leads to the electric motor housing. Air that flows through the air conduit is supplied at least to the region of the commutator of the electric motor. The electric motor housing is provided with an air outlet opening for receiving air that has been supplied to the electric motor housing via the air conduit, with this air outlet opening being in flow communication with an underpressure region of the impeller remote from the pressure-side connection of the impeller housing.

Abstract: There is disclosed an armature for an electric motor having an armature winding electrically connected to the armature commutator. The armature also has three or more housings in which portions of the armature winding are located and the connection includes terminals having a configuration for establishing and maintaining electrical contact between a terminal and a winding portion while retaining the terminal and the winding portion within a housing. The housings are in the form of radial projections which present side surfaces that act to centrifuge air outwardly to cause air to be drawn over and cool the commutator.

Abstract: A collector housing over the collector and brush assembly of a dynamoelectric machine is provided with a special valve called a vacuum breaker for permitting by manual operation the alleviation of negative pressure within the housing while the machine is in operation so that the collector housing may be rolled back from its normal location for inspection and maintenance of the collectors and brushes.

Abstract: An electronically commutated motor has a printed circuit board with opposite sides and a heat dissipating means arranged in spaced apart relation at least in part in the path of at least some of the cooling circulated in the electronically commutated motor by the rotatable assembly thereof. A plurality of insulated gate transistors are located on the heat dissipating means in heat transfer relation therewith adjacent one opposite side of the printed circuit board and are operable to commutate power supplied to the winding stages of the electronically commutated motor. Other solid state components for controlling the conductivity of the insulated gate transistors are located on the other opposite side of the printed circuit board, and the insulated gate transistors and the other solid state components are connected in circuit relation with the printed circuit board.

Abstract: Cooling air is introduced through an opening in a wall portion of the motor housing radially opposing the commutator. A deflecting surface is provided for deflecting the cooling air entering the motor through the opening away from the commutator and toward the armature so as to prevent direct contact of dust and moisture in the cooling air with the commutator.

Abstract: A commutator includes an annular end portion with a reduced diameter on each of its axially opposite sides formed by cutting away axially opposite end portions of a plurality of commutator segments included in the commutator into opposite steps, a shrink ring fitted onto the reduced diameter annular end portion remote from an armature clamp, a flanged shrink ring fitted onto the reduced diameter end portion near to the armature clamp and fitted onto a reduced diameter annular portion of an outer clamping ring of an L-shaped cross-section and supporting an armature coil, the shrink rings being formed of an insulating material.

Abstract: A rotor having a thermal bridge embedded in the rotor for transferring heat released by the commutator of the rotor to the inner bushing of the drive shaft of the electric motor thereby cooling the rotor. The bridge may either be formed of a solid metal piece or a fluid containing conduits; both of which are electrically insulated from the commutator. Orifices are formed in the thermal bridge so that both halfs of the resin molded commutator can be joined together and form a stronger rotor.

Abstract: A slip-ring arrangement for electrical machines,especially asynchronous machines, for the directional elimination of heat and for the removal of brush abrasion elements having several slip rings, located next to one another, the slip rings being provided with axial cooling-gas bores which are intersected by grooves or slots in each slip-ring surface. These cooling-gas bores are guided--separately for each slip ring--through axially extending insulating tubes to a suction fan, preferably a radial fan so that heat lost is eliminated directly at its point or origin.

Abstract: A slip ring cooling device for electrical rotary machine comprises a plurality of closed chambers axially extending in the peripheral portion with intervals therebetween in the peripheral direction, and an annular passage at one side. The closed chambers each are defined by the surfaces of holes made in the slip ring so as to axially extend at the peripheral portion of the slip ring. The axially extended holes have open ends and closed ends. The annular passage is fluidly connected to each of said open ends so that said closed chambers communicate with said annular passage. A volatile liquid poured in said passage is distributed uniformly to each of said closed chambers by centrifugal force applied thereon upon the rotation of the slip ring. The distributed liquid is evaporated by the slip ring and brushes contacting the slip ring to form vapor. The vapor is transferred to the lower temperature portion by the pressure difference to be cooled and condensed, whereby the slip ring is cooled.

Abstract: Brushholder apparatus is disclosed for supporting electrically conductive brushes of a dynamoelectric machine in a manner facilitating improved cooling of the brushes and adjacent collector ring. The apparatus includes a brushholder assembly with a pair of legs to internally support a brush and may also include a casing arranged to retain several brushholder assemblies, provide an enclosure for properly directing cooling gas circulated by a fan, and furnish a common electrical link between brushholder assemblies and a source of electric current. An insulated handle is described which can be inserted into the brushholder assembly and manipulated to lock handle, brushholder assembly, and brush together as a unit to permit safe removal of the brushholder assembly and associated brush from the casing and installation of a new brush during operation of the machine.

Abstract: In an electromotor having a stator and a rotor, a collector is located on the rotor and carbon brushes are movably supported in carbon supports relative to the outer circumferential periphery of the collector. Segment-shaped shells are located on the upstream sides of the carbon brushes and cover an angular part of the outer circumferential periphery of the collector. Downstream of the carbon brushes the outer circumferential periphery of the collector is uncovered. Accordingly, the collector can be cooled while protecting the collector and carbon brushes from contamination.

Abstract: To provide a fresh air duct for cooling of a brush holder-voltage regulator combination without introducing additional axial length to the overall alternator-regulator structure, a fresh air duct extends radially from the end bell of the alternator which is adjacent the slip rings, and the brush holder and voltage regulator are secured to a common support plate to form a single subassembly, the support plate covering an opening in the end bell of the alternator to permit introduction of the brush holder-voltage regulator assembly as a unit through the opening from the outside, positioning the brushes within the brush holder against the slip rings, and closing off the end bell to prevent ingress of hot air which may be in the engine compartment of the vehicle with which the alternator is to be used, so that the cooling air for the slip rings, brushes and the transistor voltage regulator is supplied as a stream of fresh air from the cooling air inlet stub which has its outlet positioned close to the brush holde

Abstract: Disclosed is a current supply arrangement for an electric machine rotor winding, comprising a slip ring made of a high-strength steel, fitted onto the rotor shaft with an electrically insulating layer therebetween, and adapted to be engaged by contact brushes of current collecting bars of the contact brush device. The slip ring is provided with a cylindrical recess cut in the end face thereof and disposed coaxially with the inner opening of said ring. The recess serves to receive a distributing ring made of a material having a high electrical conductivity, and provided with a current conducting bar secured thereto and electrically connected to the rotor winding by means of current conducting screws and a number of current supplying bars. The distributing ring is adapted to make electrical contact with the slip ring through an additional electrically conductive layer made of a homogeneous material and having a resistivity lower than that of the slip ring material.

Abstract: A cooling device for an electrical rotating machine is provided. The cooling device comprises; a yoke of an electric motor, end brackets and a rocker positioned in the outer circumferential portion of a commutator and fastened through the mediary of ventilation spaces to the inner circumference of one of the aforesaid end brackets. The cooling device further comprises; a screening plate for controlling the direction of cooling air being blown and a strength thereof, which is disposed between one end of the aforesaid rocker and the yoke; and a forcibly blowing device. With this cooling device, the cooling air is introduced through ventilating spaces defined radially inwardly of the aforesaid one end bracket into an electric motor by the forcibly blowing device, thereby forcibly cooling the surface of the commutator and the peripheral portion thereof.

Abstract: A current supplying device comprises a slip ring mounted on a rotor shaft with an electrically insulating layer interposed therebetween, and contacting the brushes of the current collecting bus bars of the brush contact device of an electric machine. At least on one end of the slip ring a distribution ring is mounted to which a current supplying bus bar electrically connected with the rotor winding is secured and which contacts the slip ring through an additional electrically conductive layer formed of a material with a lower specific electric resistance than that of the material of the slip ring. Both the slip ring and the distribution ring are provided with through holes arranged around the circumference of these rings and having longitudinal axes parallel to longitudinal axes of these rings. Each one of the through holes of the slip ring corresponds to one of the through holes of the distribution ring and is coaxial therewith, so that they form an integral ventilating channel.

Abstract: A solid brush current collecting system for dynamo-electric machines which selectively uses compatible materials in different applications for the moving and stationary contact members. Brushes of different compositions are disclosed and the current transfer and collecting members are operated in an inert gas atmosphere, such as carbon dioxide, having either water or organic additives, such as alcohols, hydrocarbons, ketones, and the like, to achieve operation of the current collector system at higher temperatures, higher velocities and higher current densities than is possible with conventional systems. Low friction and low wear rates are in part achieved by operating the contact members in a low temperature environment.