Abstract: An electric motor assembly e.g. for an air cycle air conditioning apparatus comprises stator windings and a rotating member mounted for rotation about a motor axis and wherein, the stator windings comprise therethrough at least one axially extending passage, and there being means to connect the passage to a source of cooling gas, whereby as the cooling gas flows along the axially extending passage the motor assembly is cooled.

Abstract: A rotor for a fuel pump motor has a shaft and a rotor core fitted to the shaft. A commutator is located on the shaft adjacent one end of the rotor core. Windings wound around poles of the rotor core are connected to terminals of segments of the commutator. A cover is fitted to the other end of the rotor core covering the ends of the windings protruding from the core. The cover has axially extending legs which are pressed into gaps between adjacent heads of the rotor poles. The commutator has an integral shroud in the form of a radially outer peripheral skirt extending axially from a radial wall of the commutator base towards the rotor core to cover the terminals and the ends of the windings protruding from the commutator end of the rotor core. A gap is left between the rotor core and the skirt and there are holes in the cover and radial wall of the commutator for the passage of fuel to cool the rotor.

Abstract: An electronic component cooling apparatus capable of permitting a sufficient amount of air to be fed to an electronic component to be cooled. An impeller which includes a plurality of blades for sucking air from one side in an axial direction of a revolving shaft of a motor is fixed on a rotor of the motor. A casing having a cylindrical cavity defined therein in which the motor and impeller are received is constructed of a peripheral wall arranged so as to surround the impeller and a closing wall for closing an end of the cavity on the other side in the axial direction. The peripheral wall is formed at a portion thereof in proximity to an end thereof on the one side with a lateral discharge port through which air suckedly introduced into the cavity is discharged so that a surrounding portion for surrounding a whole circumference of the impeller is left at a portion of the peripheral wall in proximity to an end on the other side.

Abstract: In the case of an electrical machine which has in its laminated stator core (10) slots which comprise winding slots (1) and preliminary slots (2), the winding bars (3, 4) which are embedded in the winding slot (1) are fixed by means of a slot sealing arrangement (8), which slot sealing arrangement (8) also has a double function of sealing the preliminary slot (2) from an air gap (12) of the machine. The slot sealing arrangement (8), which is formed essentially from an upper wedge (5), a lower wedge (6) and a wedge attachment (7), forms, together with the slot walls (13a, 13b) which bound the preliminary slot (2), flow channels (2a) for a gaseous cooling medium for cooling the teeth (15) of the laminated stator core (10).

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 linear motor including a coil and a jacket which covers the coil and allows a cooling medium to be supplied through a space in the jacket. The jacket is made of an insulating material, such as a ceramic material or a high-polymer resinous material. The linear motor can include a reinforcing member in the jacket for strengthening the jacket against the pressure of the cooling medium. Also disclosed are a stage device, an exposure apparatus, and a device producing method using such a linear motor.

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 starter for an engine includes a housing. A starter motor in said housing includes a field apparatus including a tubular yoke being provided to form a part of the housing. An annular ventilation passage is provided in the starter defined along an inner periphery of the yoke and being hermetically sealed from an inside of the yoke. A first ventilation hole is defined proximate a bottom portion of the housing for interconnecting an inside of the passage to an outside of the housing. A second ventilation hole is defined proximate a top portion of the ventilation passage for interconnecting the inside of the passage to an inside of the starter motor.

Abstract: In an electric motor which includes an electronic control device and an armature within a closed motor casing, the electronic control device is arranged within the casing, in a position offset axially from but close to the armature. The motor includes a thermal screen which is interposed axially between the armature and the control device, and the screen includes means for dissipating heat outside the casing.

Abstract: In a rotor of a rotary machine having a plurality of claw poles extending in the axial direction of the rotor alternately from opposite ends and a plurality of auxiliary permanent magnets held between adjacent two of said claw poles, each of the claw poles has trapezoidal outer and inner peripheries with the sides thereof forming parallelopiped rectangular spaces between adjacent claw poles. The permanent magnet members are fitted to the spaces so that the side walls of the magnet members extend to the inside of the claw poles to function as an axial flow fan.

Abstract: A substantial saving of material cost and weight is obtained in an induction motor by a rotor including two sets of differently punched laminations. The laminations in one of the two groups each weigh less than 95% of the laminations in the other one of the two groups. Such laminations can be automatically produced on a computer-controlled die press by providing a separate punch pattern that is capable of being programmed for selected laminations. The lighter laminations can be used to counterbalance a crank without requiring additional counterbalancing weight to be added outside the motor.

Abstract: The hydraulic components of a cooling circuit for a dynamoelectric machine are eliminated in a totally air cooled dynamoelectric machine which includes a rotor (12) rotatable about an axis (14) and including a central stack (20) of ferrous laminations (22) defining a plurality of radially outwardly directed circumferentially spaced poles (132), spaced shaft ends (24,26) on the axis (14) and extending from opposite sides of the stack (20) and a first air passage (46) in the stack (20). Magnetic journal bearings (54,56) and a magnetic thrust bearing (58,60) are provided for the shaft segments (24,26) and impellers (62) are located on opposite sides of the stack (20). A stator (16) surrounds the rotor (12) and includes windings (76) connected by end turns (94) located exteriorally of the stator (16).

Abstract: A larger-diameter fin is provided adjacent to a frame, while a smaller-diameter fin is provided adjacent to a protecting cover. The larger-diameter fin and the smaller-diameter fin are arranged parallel to each other in an axial direction with an intervening clearance so that their rectifying elements are disposed at opposite directions each other. The larger-diameter fin is offset outward in a radial direction. The smaller-diameter fin is offset inward in the radial direction. The protecting cover has an axial opening which introduces external air directly to the positive rectifying element. Furthermore, a radial ventilation passage is formed between the larger-diameter fin and the frame so as to pass the central position of the negative rectifying element. An opening, introducing external air directly, is formed at a radial-outer end of the radial ventilation passage.

Abstract: A drive motor for an electric vehicle includes a cylindrical housing, a cylindrical stator disposed within the housing, a coil wound around the stator, a rotor disposed within the stator, and front and rear covers respectively coupled on front and rear ends of the housing. The housing includes a cylindrical coolant passage concentrically formed around the stator in the housing, and the front or rear cover includes a coolant inlet port through which coolant is fed to the coolant passage and a coolant outlet port through which coolant circulated the coolant passage is exhausted.

Abstract: An electric motor comprises a stator having a plurality of conductive windings radially spaced about a central axis. The motor includes a rotor located radially inward of the stator and rotationally fixed with respect to a shaft disposed along the central axis. The rotor defines an area in which, upon rotation of the rotor, a low pressure vacuum is created drawing air radially outward, with respect to the rotor, from the area. The rotor also includes an annular plate disposed at a transverse end of the rotor coaxial with the shaft. The annular plate defines at least one hole extending axially through the annular plate and in pneumatic communication with the area. The hole is configured so air is drawn by the low pressure vacuum through the hole to the area.

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: A cooling circuit for a motor which includes a rotor having a rotor shaft, and a core fitted on the rotor shaft and carrying a plurality of permanent magnets arranged on its outer circumference. A stator is arranged radially outward of the rotor. The motor cooling circuit includes axially extending oil passages formed in the rotor core radially inward of the permanent magnets.

Abstract: A generator coil comprising a plurality of stacked windings, each winding comprising a length of copper having a generally rectangular cross-sectional shape, and including an upper surface, a lower surface and a pair of side edges, wherein a groove is formed in the upper surface extending substantially the entire length of the winding.

Abstract: The invention concerns a device for supporting an electric motor driving a turbine. The device having a cage delimiting a housing for receiving the motor casing, this housing including a peripheral wall connected to a front wall, the peripheral wall being interrupted in order to define at least one channel for cooling the motor, the peripheral wall having at least two U-shaped folded lugs directed towards the inside of the housing and able to come into abutment against the casing of the motor.

Abstract: An alternator, in particular for a motor vehicle, comprises half-shells to which stator windings are fixed and which rotatably receive a rotor shaft, and a rectifier circuit made up of power diodes each comprising body and a lead extending axially from said body. The bodies of some of the diodes are connected to ground while the bodies of the other diodes are connected to an output terminal of the alternator. The diode bodies are fixed on or in the back half-shell of the alternator on or in a dissipating support which is generally in the form of a plate that is insulated from the half-shell and that is outside it. According to the invention, the distance between the dissipating support and the back half-shell, and the positions of the said other diodes on the dissipating support are such that the leads of said other diodes project into openings formed in the back half-shell.

Abstract: A tape drive for a data tape mini-cartridge. Cartridges of interest have an internal capstan for an internal drive belt driven by a drive roller in the tape drive. The tape drive has a drive roller directly on a rotating exterior surface of the motor. In one example embodiment, the motor has an external rotor. In an example embodiment, no part of the motor diameter extends below or above the data cartridge. No intermediate rollers or belts are required. The motor stator is preferably mounted onto a metal support plate for heat conduction from the stator into the support plate. The motor preferably has space between the rotor and the support plate for air to flow into the stator for convection cooling. In addition, the motor rotor preferably includes cooling fins and air flow holes for additional convection cooling. A spring is mounted between the motor support plate and a chassis to provide a force holding the drive roller against the cartridge capstan.

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 drive unit is provided including an electric motor and a pot-shaped drum driven by the electric motor. The drum accommodates the electric motor and is connected by means of its pot base to the drive-side shaft end of the electric motor. Improved power utilization of the electric motor is made possible by at least one web extending in the axial direction of the drive unit and projecting radially into the gap between the housing of the electric motor and the drum inner wall. The at least one web is arranged on the housing of the electric motor and/or on the drum inner wall and/or at least one through-hole is provided in the pot base of the drum.

Abstract: A liquid cooled armature winding for a dynamoelectric machine having rectangular hollow cooling strands, wherein the cooling conduit is bounded by a continuous wall of varying wall thickness designed to minimize stress due to cyclical forces on the strand walls. Conduits of elliptical and rhomboidal cross-section are disclosed.

Abstract: It is an object of the present invention to provide an electric motor for an electric vehicle with an improved cooling capacity by causing coils wound around a stator to serve as a tubular heat pipe type heat transfer device. An electric motor for an electric vehicle includes a stator 11, coils 12 wound around at least the stator, and a rotor 13 being rotated by an induction field developed around the coils 12. In one embodiment of the invention the coils 12 are formed of a tubular container 121 which is filled with a working fluid which vibrates in an axial direction of a tube by nuclear boiling generated at a high temperature portion of the coils 12. The coils themselves are arranged as a non-looped tubular heat pipe type heat transfer device.

Abstract: A cooling loop structure of high speed spindle comprises three groups of cooling areas where the first group being the front bearing cooling area, the second group being the motor cooling area and the third group being the rear bearing cooling area. Cooling fluid from the cooling machine outlet, flows through the rear end of spindle into the front bearing cooling area, then flows into the motor cooling area, finally, after flowing into the rear bearing cooling area, it flows back into the inlet of cooling machine, thereby, forms a temperature-controlled cooling loop. The cooling loop needs only a setup of cooling fluid inlet and outlet at the rear end of spindle which can avoid being using too many exposed cooling pipes that result in space occupation and being inconvenient in the installation of spindle.

Abstract: Pivoting vane internal extremity bearing (1) whose internal extremities are connected by a linking ring (12). The bearing elements (18) connecting the internal extremity pivots (10) to the ring (12) are composed of a bush (19) prolonged by bearing necks (20) with a spin axis (X') parallel to that of the ring (12). The forces undergone by the vanes, which transversally move the pivots (10), do not cause any wear of the bush (19), but a rotation of the latter around the axis (X'). Application for turbine aero engine stator vanes.

Abstract: A motor control system with a motor having an essentially cylindrical casing and a control system having a processor and power control elements. The control system generates the driving current for the motor based on an external command signal fed to the control system, transmits the driving current to the motor via a line, and receives signals which indicate the status of the motor. The control system is mounted directly on a housing. The housing is connected to the casing by narrow webs bridging the air interspace formed between the casing of the motor and the housing of the control system, thereby mitigating mechanical and thermal influences of the casing of the motor and the housing.

Abstract: A conductor bar configuration includes a multiplicity of conductor bars extending along a longitudinal axis, stacked on one another along a vertical axis and each having four cooling ducts aligned parallel to the longitudinal axis, disposed next to one another in pairs in the direction of a transverse axis perpendicular to the longitudinal axis and to the vertical axis and disposed one behind another in pairs along the longitudinal axis. Each cooling duct has an associated orifice in the vicinity of one end of the configuration and reaches into one of two gas outlet zones disposed approximately in the middle relative to the longitudinal axis, where it merges into an outlet duct directed at an acute angle to the vertical axis. For each pair of cooling ducts situated next to one another in the case of each conductor bar, the orifice of one cooling duct is disposed directly at one end and the orifice of the other cooling duct is spaced from that end.

Abstract: The invention is a rectifier assembly (10) having reduced mass and high rigidity permitting operation at high rotational speeds. The rotating rectifier includes a rotator shaft assembly (12), a first conductive diode carrier (18), a second conductive diode carrier (20), first and second electrical conductors (40 and 44) connected to the first and second diode carriers and to one end of the rectifier assembly to provide a first DC output and a second DC output and first, second and third diode groups (37, 37', 37"). Each conductive diode carrier has an inner annulus (24) including first, second and third diode receiving surfaces (26, 28 and 30) disposed at spaced apart locations on the inner annulus of the diode carrier and an outer periphery which engages an inner annulus of the rotor shaft assembly. Each diode group comprises at least two diodes (38).

Abstract: A substantial saving of material cost and weight is obtained in an induction motor by a rotor including two sets of differently punched laminations. The laminations in one of the two groups each weigh less than 95% of the laminations in the other one of the two groups. Such laminations can be automatically produced on a computer-controlled die press by providing a separate punch pattern that is capable of being programmed for selected laminations. The lighter laminations can be used to counterbalance a crank without requiring additional counterbalancing weight to be added outside the motor.

Abstract: A bearing 12 is provided on the end portion of a housing 30. This bearing 12 supports a shaft 14. A magnetic circuit 15, 16 for driving the shaft 14 is provided between the shaft 14 and the housing 30 with a gap 29 passing through in an axial direction. An entry route R1 for leading gas from the outside of the housing 30 to the gap 29 in the magnetic circuit 15, 16 and an exhaust route R2 for exhausting the gas to the outside of the housing 30 are provided so as not to reach the bearing 12. As a result, the lifespan of the electric motor can be lengthened, the startup time can be shortened, the number of parts can be reduced, the number of steps required for processing and assembly can be reduced, and the power loss can be decreased.

Abstract: A labyrinth formed between a pulley and a housing of a rotary machine such as an alternator is arranged to have a plurality of differently-shaped air gaps. When the size of a first air gap between a belt guide of the pulley is .delta.1, the size of a second air gap formed between a cylindrical base portion of the pulley and a bearing box of the housing is .delta.2, a third air gap formed between a front wall and a flange portion of the bearing box is .delta.3 and a fourth air gap formed between a boss portion and a bearing seal member is .delta.4, the air gap is arranged to satisfy the following inequality: .delta.1<.delta.2, .delta.2>.delta.3, .delta.3>.delta.4.

Abstract: A cooling apparatus is provided for an AC generator, particularly for a transverse-flow generator having a stator with at least one armature winding, as well as a rotor disposed opposite the armature winding. Collector rings are secured to a carrier disk attached to a rotor shaft. The collector rings have a plurality of polarized magnets and magnetizable collector elements in alternating sequence disposed therein. At least one cooling channel through which a coolant can flow is provided in the vicinity of the carrier disk. The cooling channel is separated from the carrier disk only by a channel cover which has a minimal thickness and by the air gap between the rotor and the stator.

Abstract: A rotor for a dynamo-electric machine has a V-shaped groove for providing a fast gas stream with an outward speed component in the radial direction, the V-shaped groove being provided on the upstream side of the fast gas stream at an opening of a wedge exhaust hole. The dynamo-electric machine also has a sloping surface which is inclined with respect to the radial direction so that the exhaust stream coming out of the wedge exhaust hole is led in the direction of the fast gas stream, the sloping surface being provided on the downstream side of the fast gas stream at the wedge exhaust hole. This structure permits a smaller angle of the mergence of the fast gas stream and the exhaust stream and it accordingly reduces the pressure loss in the coolant gas at the outlet of the wedge exhaust hole, thus achieving reduced loss in the fan power. The result is higher operating efficiency of the rotor.

Abstract: In a starter motor for a starter, a plurality of permanent magnets are arranged circumferentially inside a cylindrical yoke and outside an armature. A cylindrical sleeve is fitted with the permanent magnets to radially outwardly fix the permanent magnets to the yoke. A discharge hole for discharging a cooling air from the inside to the outside of the motor is formed on the bottom of the yoke at a position between the adjacent two of the permanent magnets. The sleeve restricts the splash water from entering directly inside the motor through the discharge hole.

Abstract: A cooling apparatus is provided for an AC generator, particularly for a transverse-flow generator having a stator with at least one armature winding, as well as a rotor disposed opposite the armature winding. Collector rings are secured to a carrier disk attached to a rotor shaft. The collector rings have a plurality of polarized magnets and magnetizable collector elements in alternating sequence disposed therein. At least one cooling channel through which a coolant can flow is provided in the vicinity of the carrier disk. The cooling channel is separated from the carrier disk only by a channel cover which has a minimal thickness and by the air gap between the rotor and the stator.

Abstract: A method of repairing a joint between conductor elements of a stator winding bar of an electrical machine and a connecting device connected to an end of the stator winding bar for providing electrical connection and coolant flow for the conductor elements includes the steps of removing an existing connecting device from the end of the stator winding bar; aligning the conductors of the end of the stator winding bar by heating the bar end to above the flow point of the braze holding the conductors in position while simultaneously holding the conductors of the end of the stator winding bar under compression in two orthogonal directions perpendicular to the length of the stator winding bar; forming slots in the end of the stator winding bar and at locations such that the slots extend to locations where the conductor elements abut one another; applying an electrically conductive first connecting part onto the end of the stator winding bar such that the first connecting part substantially surrounds the end of the s

Abstract: The method for repairing a connecting device for the electrical connection and for supplying and carrying away the coolant to and from the hollow conductor elements of the stator winding bars of electrical machines includes removal of the existing connecting device (2) from the bar end by inductive heating; cleaning the bar end in the region where the new connecting device is intended to be mounted; material-cutting machining the end surface of the bar end; introducing narrow slots (7) between adjacent conductor elements (1) into the end of the bar in the transverse and vertical directions; pushing on a first connecting part (2a) which is made of copper and completely surrounds the bar end; filling remaining gaps between the first connecting part (2a) and the outer surfaces of the bar end with copper foil and/or solder foil; filling the narrow slots (7) with copper foil and/or solder foil (10) or a combination of both; inductive heating of the first connecting part (2a) and of the bar end and soldering with t

Abstract: An electric vehicle motor and related method of cooling wherein coolant is provided to a coolant inlet of the motor housing, directed through a plurality of radial slots of a stator core that is encased within the housing, and exited from a coolant outlet of the motor housing. The radial slots house the stator conductor wires such that the coolant is forced to come in contact with all of the external surface of all of the stator wires.

Abstract: A half-coil for the stator winding of an electrodynamic system such as an electrical generator or motor includes an improved tube stack arrangement and a roebelling configuration which is designed to minimize power loss. The tube stack arrangement includes, in the disclosed embodiment, two central tube stacks and two roebel bars, one on each side of the tube stacks. By this arrangement, the individual strands in the roebel bars do not need to be transposed around the tube stacks, as was the case in prior art configurations utilizing more than one tube stack. The improved roebelling arrangement includes, in the disclosed embodiment, a total 720.degree. transposition, including a 90.degree. transposition in each of the two involute portions. To accomplish the 720.degree. transposition in a limited space, the individual strands are combined into groups of two for a portion of the transposition.

Abstract: Cooling of an alternator driven by an internal combustion engine wherein a field core of the alternator is composed of claw-type magnet poles and a cylindrical core such that an oil passage is formed in the regions where the cylindrical core and the rotor shaft oppose each other and where the cylindrical core and the claw-type magnetic poles oppose each other. The oil passage is communicated at its one end with an oil source outside the alternator so as to introduce an oil into the oil passage during operation of the alternator so that a centrifugal force is applied to the oil by the rotation of the rotary field core thereby spraying the oil in the form of vapor or mist onto the stator coil.

Abstract: Lack of uniformity in liquid cooling the end turns of a dynamoelectric machine can be avoided in a structure including a stator (14) having a rotor receiving opening (22) and opposed end faces (18) and (20). Slots (24) in the stator (14) extend between the end faces (18) and (20) and a plurality of electrical conductors (28) are located in each of the slots (24) such that interstices exist between adjacent conductors (28) and define coolant flow passages within the slots (24) from one face (18) to the other (20). The conductors (18) exit the slots (24) at the end faces (18 and 20) and are redirected into another one of the slots (24) to thereby define end turns (30) at each end face (18 and 20). Two tubes (32 and 34) are located on each end turn (30) and adjacent ends (36, 38) of each tube (32, 34) are slightly spaced to defined a gap (40) and remote ends (42, 44) of each tube (32, 34) are sealed to the associated end face (18, 20) about the periphery of the associated slot (24).

Abstract: A dust exhauster is described whose electric motor is designed as a commutatorless dc motor. The electrical and electronic components of the dust exhauster are positioned according to the invention within the motor cooling air intake channel. Consequently, they are directly cooled by the stream of cooling air, resulting in a substantially extended service life for these components. Furthermore, the motor with its components is relatively small in design.

Abstract: An improved circuit ring and method of assembly for use in electrical machines, such as power generators, motors and the like, including an integral bus bar for conducting current to a machine terminal. The circuit ring is fabricated from hollow copper tubing of a rectangular cross-section and of a size which will allow electrical circuit leads to be brazed thereto in such a manner as to avoid damage to insulation. Cooling fluid is passed through the tubing so that the rings can be assembled and used in high power density electrical machinery.

Abstract: A stator drain supports stator windings and rotor bearings and permits fluid coolant for the rotor bearings to be drained outward past the stator windings from the bearings. The drain is formed of a non-metallic material and has an inner surface for supporting a bearing liner of the rotor bearings, a plurality of spaced openings for receiving stator windings and drain slots extending through the annular member at locations corresponding to spaces between the stator windings for draining the fluid coolant. The stator drain is useful in a dual permanent magnet generator, for example.

Abstract: The problem of stator cooling in a dynamoelectric machine is resolved using manufacturing spaces (32) within stator slots (20) for flow of oil coolant. In order to secure stator winding conductors (30) within the slots, a spring wedge (36) provides a biasing force for biasing the conductors against movements within the slots.

Abstract: Cooling means are provided for directly cooling the bore bus bars which connect a direct current exciter such as a bore pack exciter to the field of an electric power generator. Two bore bus bars are separated by an insulating sheet have a circular cross section, and are surrounded by an insulating cylinder. The bore bus bars include an axially extending slot adjacent the insulation to form passageways through which cooling gas flows to directly cool the bus bars and pass through the generator to the cooling unit.

Abstract: In a generator exciter composed of a stator (12) for producing a dc field and a rotor (16, 18) mounted to rotate relative to the stator (12) and including armature windings (18) connected to generate ac output currents, the rotor (16, 18) is mounted radially outwardly of the stator (12), and is insulated from its support.

Abstract: An axial vent channel (30) for installation in a generator rotor winding slot, the channel (30) being in the form of an elongate, closed tube of polygonal cross section enclosing a longitudinal passage (32), the tube being formed to have a closed bottom wall and an opposed, substantially closed, top wall provided with a plurality of radial vent slits (36) spaced apart along the longitudinal passage (32), the channel (30) being configured to be installed in the rotor winding slot with the passage (32) extending parallel to the axis of the rotor, the bottom wall facing toward the axis of the rotor and the top wall facing away from the axis of the rotor.