Abstract: The connecting device has yokes (5, 6) brazed to the winding rod ends (1, 2), and the end surfaces of the yokes have distance pieces (10, 11, 12, 13). The hollow conductors (4) protrude beyond the solid part conductors (3) and are led through brazing plates (14, 15) which are brazed to both the hollow conductors (4) and the distance pieces (10, 11, 12, 13). Caps (16, 17) are placed over the brazing plates (14, 15) and brazed to the brazing plates (14, 15) in such a way that there is no leakage of liquid. The brazing points can be inspected at any time and, if necessary, improved because of the distance between the brazing plates (14, 15) and the rod end surface. The water chambers (20, 21) formed by the brazing plates (14, 15) and the caps (16, 17) are solidly connected to the winding rods (1, 2) and to the yokes (5, 6), so that no relative vibrations, which can damage the hollow conductors, can occur. The water chambers (20, 21), which are expensive in manufacture, do not depend on the rod geometry.

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: An improved construction of Randel-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.

Abstract: A high current density component of a dynamoelectric machine rotor is cooled by the use of thermosyphons that carry heat from the heat generating element to a cooler part of the rotor. A homopolar generator is shown with a rotor having a core covered by a copper shell that when so cooled by thermosyphons can be operated with substantially longer pulse intervals than previously.

Abstract: An improved end turn construction to improve cooling in a dynamoelectric machine and to axially reduce the size thereof. The machine includes a body (12) of magnetizable material having opposed ends (18) an opening (14) extending between the ends and the plurality of slots (50) about the opening (14). A rotor (16) is disposed within the opening (14) and journalled for rotation therein and electric conductors (52) are located in the slots (50) and extend to ends (54, 56) just past the ends (18) of the body (12). End turns (58, 60, 68) each interconnect a predetermined pair of the conductors (52) and extend substantially circumferntially and radially of the rotor axis with no appreciable extension axially of the axis.

Abstract: To eliminate difficulties in making a large number of external connections from solid wire windings in a dynamoelectric machine, a unique terminal block (54) is disposed within the machine housing 10. The machine includes a stator having a body (12) of magnetizable material and a plurality of groups of windings (14, 44, 46, 48), each winding being of solid wire. A rotor (18) is mounted for rotation relative to the stator and the housing (10) contains both the rotor (18) and the stator (12,14). A plurality of multi-terminal connectors (34) are mounted on the housing (10) and accessible from the exterior thereof and an elongated terminal block (54) is disposed within the housing (10) and is comprised of a stack of flat insulators (60-68) sandwiching electrically isolated bus bars 74 between adjacent ones of the insulators. Each bus bar (74) is associated with a winding group (44, 46, 48).

Abstract: A variable output generator for supplying electrical power to a specific load is cooled by a plurality of motor driven fans 112, 113, 114, 115 disposed in a generator pit 2. An appropriate number of motor driven fans for providing cooling air for the generator are energized in response to the instantaneous generator output, to thereby avoid wasteful power consumption.

Abstract: An external rotor motor used in drying fans and blowers provides an air current within a hollow fixed post which passes through the stator of the motor so that heat is transferred to the air current from the stator interior and transported by the air current to the end of the hollow post. At the end of the hollow post there is an air foil mounted normal to the post and designed for producing a radial air flow in a space between the air foil and the end plate of the rotor. An air flow produced by the impellers mounted to the rotor draw the air from the space and produces the current of air in the hollow post which thereby removes heat from the stator. Heat pipes may also be mounted within the hollow shaft to remove heat from the stator.

Abstract: The cooling arrangement for a machine provided with hollow fins has in the end regions of the stator housing ports for the internal air and below the stator housing, closed at one end by an end plate, in the region of the respective ports, a motor-driven internal fan which is laterally covered by an air deflection surface between it and the pierced inner bearing bracket. Between the inner shaft end and the motor attached to the end plate, a rotation sensor coupled with the shaft end is arranged and it is used for air conduction as well. In the fan shell a motor-driven external fan is arranged and its motor may be attached on the outer side of the end plate.

Abstract: An electrical machine with a radial path air-cooled rotor is provided with prewhirl inlet guide vanes in the coolant inlet duct. The guide vanes are fixed members spaced from each other in an arc around the duct with their radial inward edges advanced in the direction of rotation of the rotor from the radial outer edges and preferably have a smoothly curved airfoil configuration so as to smooth and facilitate air flow through the end turn region and the slot channels.

Abstract: An electrical machine with a radial path air-cooled rotor is provided with a stator end turn shell structure of a smoothly curved configuration that, with a like smoothly curved configuration on the outer wall of the air inlet duct, smooths and facilitates air flow through the exhaust passage and serves as a gas diffuser and noise baffle.

Abstract: A gas-cooled a.c. machine having a rotor and a stator, each in the form of sheet metal packs, and a winding head, wherein in order to obtain optimum cooling of the rotor sheet metal pack, the stator sheet metal pack and the winding head, the machine is constructed of a stator central part and two stator end parts and ducts are provided in the casing corners for the removal of the cooling gas. The ducts are bounded only by the walls of the casing and the back of the stator sheet metal pack, are separated by the stator sheet metal pack, and extend over the total length thereof. Cooling gas conveyed by fans is first conveyed into the inner winding head chamber or the rotor inlet flow chamber and there divided into two cooling circuits connected in parallel. In a first cooling circuit, the cooling gas is led through the rotor sheet metal pack and through the stator sheet metal pack, and in the second cooling circuit through the winding head.

Abstract: A ventilation scheme for rotor windings in a dynamoelectric machine includes passages axially extending through the axial end turn conductors of the windings. Each axially extending conductor is an integral, single bar of metal having a groove thereon which defines the passages in cooperation with the turn insulation interposed between each conductor and the underlying and overlaying conductors. Circumferential end turn conductors are mechanically and electrically attached to the axial end turn conductors by reinforcing plates. Circumferential passages through the circumferential end turn conductors allow gas to flow between an end turn region and an isolated low pressure area. The centrifugal pumping action developed by the rotation of the rotor draws gas from the end turn region through the passages and to the periphery of the rotor body.

Abstract: A motor-incorporated spindle head unit is provided with a rotatable spindle on which a rotor assembly of the motor is fixedly mounted. A stator assembly is arranged around the rotor assembly and is fixed to an outer framework of the spindle head unit in a cantilever fashion. A cooling system for cooling the stator assembly is formed by providing an annular gap between the outer framework and the periphery of the stator assembly and is adapted to permit cooling air introduced into the annular gap through air ports formed in an end of the outer framework to flow through at least a throughbore formed in the stator assembly.

Abstract: An electrical alternating current machine having a stator sheet metal body defining an external contour of a regular n-sided polygon or a circular sheet metal shape. The radial and axial restraint of the sheet metal pack occurs by means of casing walls, tension rails (23) and end plates. The air is conveyed in the electrically unused casing corners. The sheet metal pack, together with the casing walls and end plates, form a compact self-supporting constructional unit with reduced shaft centerline height for a given power.

Abstract: A rotary electric machine including a stator in which a rotor is journalled. Coolant passages for a rotor winding are defined by the interstices between precision wound turns and winding layers to assure uniform distribution of coolant during operation to avoid mechanical balance problems and uniform cooling of components to assure long life.

Abstract: Cooling medium flows from the rotor of a rotary electric machine from a rotor side towards an air gap side between the rotor and stator of the machine, wherein provision is made of guide vanes such that the cooling medium flows in a direction opposite to the direction in which the rotor rotates, reducing the angular momentum of the coolant to zero, to increase circulation efficiency.

Abstract: The invention is an aircraft power generation system which includes a tandem generator (10) which includes left and right generators (14, 15) arranged within a single housing (12). The left and right generators (14, 15) are driven at the anti-drive end of the tandem generator (10) by a gear arrangement including gears (22), (24) and (26). A phase indexer (36) including a phase adjust nut (38) is arranged in conjunction with driven gear (26) to provide for "vernier" phase-alignment of the generator rotors. In an alternative embodiment, phase-alignment of the generator rotors is accomplished by arranging them in-line to form an in-line tandem generator (10').In a preferred arrangement, an in-line generator (70) is arranged to be isolated from an aircraft engine via an electromechanical disconnect (108).

Abstract: In a dynamoelectric machine, a fan diffuser and collector combination is part of the cooling system of the machine. The fan diffuser and collector is located in the annular chamber defined by the inner and outer end plate shields at one end of the machine. The fan diffuser includes a disk disposed in the radially inner portion of the annular chamber. An inboard surface of the disk is parallel to the adjacent surface of one of the shields. Both surfaces define a diffuser channel which receives substantially all of the gas flow expelled by a fan radially coextensive with the annular chamber. The disk is mounted on the other shield but has an outboard surface spaced away from that latter shield. The disk is foreshortened with respect to a frame wrapper which surrounds the stator and rotor of the dynamoelectric machine thereby forming a collector.

Abstract: A device for cooling a reversible motor comprising: a plurality of blade-type cooling fins (17) attached to the protrusion (13b) of a rotary shaft (13) which protrusion is protruded into a cooling chamber (5) formed on the outside of a motor case (10); an exhaust blower (25) provided on the outer side of the cooling chamber (5) in the axial direction to expel the cooling air, and; a fixed rectifying vane (29), consisting of a plurality of radially arrayed guide vanes (29a), provided in the exhaust space (28) between the blade-type cooling fins (17) and the exhaust blower. In the cooling device, the cooling air stream, moving in a spiral manner, passes through the blade-type cooling fins (17), is rectified in the axial direction via the fixed rectifying vane (29) and is expelled by the exhaust blower (25), when the motor runs in both the forward and the reverse directions.

Abstract: A device for cooling a salient-type rotor by ventilation, in which ventilation ducts are formed in the radial direction in the magnetic cores on both sides thereof relative to the circumferential direction so as to communicate with the ventilation ducts in the rim. The cooling air supplied through the ventilation ducts in the rim is also permitted to flow through the ventilation ducts in the magnetic cores between the adjacent cores so that the ventilation resistance is reduced, the stator coils and the stator cores are efficiently cooled, and the field coils wound around the magnetic cores are efficiently cooled from the outer side and from the inner side thereof.

Abstract: A ventilation device for a rotating electric machine comprises a first side plate having an opening at the center near which a fan is placed, a second side plate placed facing the first side plate and a sucking chamber formed by a shielding plate which covers between both the side plates except for an intake port so as to feed cooling air by the fan from the intake port through the sucking chamber and the opening of the first side plate to the rotating electric machine body, wherein a whirling stream prevention plate for preventing the whirling of air flow in the sucking chamber is placed in the sucking chamber.

Abstract: An electrical machine with compressed air cooling, the compressed air being circulated in a closed circuit. After having the compressed air heated by thermal losses of the electrical machine is cooled in the heat exchanger, it is led back into the machine. The compressed air is passed through the cooling channels between two layers of the armature winding heads, resulting in a steady thermal dissipation from the armature windings. Compared to the traditional machines the surface heat transmission factor --increasing due to the pressure--and steady cooling of the armature winding, enables the decrease of the mass of the machine per unit output.

Abstract: An AC generator for vehicles has a cooling fan secured to one end face of a rotor core and being operative to produce radial and axial flows of cooling air. The radial air flow passes across a stator coil and outwardly through air outlet openings formed in a peripheral wall portion of a housing. The axial air flow passes through spaces between respective fingers of rotor core and also through air gap between the rotor and stator whereby the rotor and stator coils are reliably cooled by the cooling fan. In an embodiment of the invention, an additional radial-flow fan is provided and mounted on the rotor in face-to-face contacting relationship with the other end face of the rotor core.

Abstract: A stator of a dynamoelectric machine comprises an iron core formed by laminating irons sheets, armature coils received in slots of the iron core, a plurality of spacer blocks extending radially in contact with an end surface of the iron core, clamping end plates for clamping the iron core, and buffer boards located between the spacer blocks. The spacer blocks include long ones located between an outer periphery of the iron core and teeth portions thereof and short ones located between the outer periphery and the bottom portions of the slots. Each of the short spacer blocks is provided with a radially extending channel formed on the side surface facing to the end surface of the iron core and the channel has gas air outlet and one end opened on the side facing to the slot bottom to form an inlet for a cooling gas.

Abstract: In a dynamoelectric machine wherein cooling air is sent into spaces between magnetic poles of a salient pole type rotor in parallel with an axis of the rotor, an air chamber is provided in the vicinity of axial ends of the poles of the rotor and adapted to rotate the air therewithin together with the rotor, whereby the cooling air flows from the outside of the rotor through the air chamber into the spaces between the poles.

Abstract: A reverse flow cooled dynamoelectric machine is provided with an annular baffle disposed in the gap thereof and spaced from stator core laminations at the end region for improving the cooling of these laminations. The baffle prevents heated gas flow from the end turn region of the rotor and gas from the cooling passages in the stator assembly from impinging in the gap.

Abstract: In the coil end of a rotor of an electrical machine, the terminal ends emerging from different grooves and resting on different cylindrical surfaces must be electrically connected with each other and hydraulically with a water chamber. This is accomplished by distributors which include a connecting stud and two shanks which extend therefrom. The shanks have bores which extend at an acute angle into a bore on the connecting stud. This causes only very small flow resistance. The freedom that is gained in terms of choosing the desired shank lengths, and the freedom to choose the interval between the free shank endings, gives rise to a number of production advantages. Furthermore, the quality tests for checking the junction of the distributor pieces with the terminal endings of the windings are simplified.

Abstract: Method of balancing an electrical machine rotor comprising starting the liquid cooling system of the rotor winding formed of parallel hydraulic branches arranged on the body of the rotor, monitoring the variables of the cooling conditions of said branches, with the liquid cooling system under operation, for determining temperature asymmetry which leads to heat unbalance of the rotor, and altering hydraulic resistance in said branches so that the proportion of said variables provide the same magnitude of overheating of the liquid at least in each pair of the diametrically arranged branches of the cooling system.

Abstract: A laminated rotor for a dynamoelectric machine characterized by requiring and incorporating only two differently configured sets of rotor laminations to afford axial and radial coolant passageways through the rotor. Each lamination in the respective sets is provided with punched apertures that form, respectively, conductor slots arcuately spaced around its periphery, and is further provided with a plurality of axial coolant passageways near its inner diameter. Each lamination in one of the sets of laminations also includes a plurality of arcuately spaced radial ducts, each disposed between a respective pair of conductor slots.

Abstract: The present invention provides an electromagnetic coupling including a housing (13), the rotor (33), an inductor drum (25), including a generally cylindrical drum portion (27) having an outer heat dissipating surface including at least one generally circumferentially extending heat dissipating groove (57). A coil (47) is provided for coupling the rotor member and inductor drum. The housing includes openings therein for directing cooling fluid into the housing to dissipate heat generated in the inductor drum and a plurality of fluid directing means are attached to the outer heat dissipating surface of the inductor drum for rotation therewith. The fluid directing means (61) are obliquely disposed relative to the axis of rotation of the inductor drum to direct cooling fluid inwardly into heat dissipating grooves to cool the inductor drum.

Abstract: An electric motor comprising a stator and a rotor rotatably mounted in a stator cavity. The stator is made from at least two stator sections and each section comprises a plurality of axially directed generally semi-cylindrical sheet metal laminations having axial edges which are directed inwardly to form the rotor cavity and having the area between said edges surrounded by a stator coil. Each stator part has at its axial ends a radially directed plate member including a series of axially extending spaced teeth which project and engage between the edges of the sheet metal laminations adjacent the plate member to maintain the laminations in predetermined spaced relation to allow passage of cooling medium through the stator coil.

Abstract: A stator core for a dynamoelectric machine comprises a plurality of coaxially aligned annular module sections with axial cooling passages therethrough. The modules are spaced apart and fluid coupling means are disposed between the aligned axial passages in adjacent modules in a selective fashion to provide cooling flow paths which are both axially and radially directed.

Abstract: A totally enclosed electrical machine, particularly a high power electric motor, is provided with a plate-type, crossflow, air-to-air heat exchanger which is seated on the frame of the electrical machine. Adjacent plates of the heat exchanger are modular units which define an array of ducts through which the internal air heated by the machine flows in a direction away from the machine. The ducts at opposite ends of the array provide passages for the bi-directional flow of air, such that air which is cooled in the heat exchanger is returned to the opposite ends of the machine. The heat exchanger is provided with a plenum in which air is returned to the end ducts. A baffle in the plenum distributes the air in different amounts, which vary progressively but in opposite senses, to the return ducts which communicate with the opposite ends of the machine thereby equalizing the temperature of the return air supplied to the opposite ends of the machine and providing uniform cooling of the machine.

Abstract: With a salient pole dynamoelectric machine embodying this invention, the inner peripheral wall of the stator is covered with a partition wall which is formed of a cylindrical base wall spaced from the inner peripheral wall of the stator at a prescribed distance and annular rims formed at both ends of the cylindrical base wall. Air inlet chambers each containing a blower and air outlet chamber each containing an air cooler are alternately arranged in a circumferential direction on the outer peripheral wall of the stator. Application of the partition wall enables to stator and rotor both be separately cooled by the corresponding exclusive blowers, thereby ensuring the efficient cooling of the dynamoelectric machine, and reduction in cooling motive power and blower pressure.

Abstract: A rotor for hydrogen-cooled rotary electric machines is provided with a gas inlet chamber and a gas outlet chamber which are circumferentially defined by radially extending partition walls and disposed in a region between a retaining ring holding field windings in position and a rotor shaft. The gas outlet chamber is divided into a first zone located near the polar axis and a second zone located near the interpolar axis.Rotor cooling gas is introduced through a gas inlet port to the gas inlet chamber to flow to the gas outlet chamber divided into a plurality of zones while cooling the field windings. From the gas outlet chamber, the gas is discharged through axially extending passages and fan-like ventilating devices to the outside of the rotor.

Abstract: The bundle of laminations in an electric generator as motor contains a plurality of lamination stacks arranged in series in an axial direction and a plurality of slots in which are arranged the conductors of the machine winding. In order to improve the dissipation of the heat losses from the bundle of laminations and the winding, laminations are contained in the stacks which have a slot width greater than the width of the conductors and which have on the slot floor a recess of a greater depth. Thus side ducts are formed alongside the conductor which are in connection with the air gap of the machine, and axial cooling channels are formed on the slot floor which open at least on one side into a radial cooling channel. By reversible packing of these laminations, the position of the lateral channels can be altered.

Abstract: The electric machine comprises a rotor, a stator filled with a cooling fluid and separated from the rotor by a sealed jacket forming chambers of end-connectors of the stator winding. Within the stator there are provided ducts for the cooling fluid to flow therein, which connect said chambers. An external pipeline, at least part of which is disposed above the stator, forms an ascending and descending branches of the cooling fluid circulation system, each of the branches being communicated with one of said chambers. The upper section of the descending branch includes a cooler which is thus comprised in the whole system of the cooling fluid natural circulation which is effected due to the difference in specific weights of heated and cooled fluid.

Abstract: A dynamoelectric machine's segmented baffle assembly comprises a baffle ring which is bolted to a back-up plate disposed in the stator core. The annular-shaped baffle ring is formed from a plurality of arcual segments, each segment secured by at least one of said bolts. For low flow rates of coolant gas, the air gap can be further reduced by means of a teflon insert located on the inner circumferential surface of the baffle ring. For expeditious access to the rotor assembly, only one of said segments need be.

Abstract: The gas-cooled electric machine of the present invention comprises a rotor, a stator having a core with radial ducts and slots on the inner surface, a winding arranged in the slots of the stator core, and slot wedges provided with projections arranged in the stator-to-rotor air gap lengthwise the longitudinal axis of the electric machine, the above said projections being provided on part of the slot wedges. Each of the projections has a base sloping towards the stator inner surface, a longitudinal rib adjacent the base end most removed from stator and facing the rotor, two side walls parallel to each other arranged in the stator transverse planes and facing the stator inner surface. The space formed between the projection base and the stator inner surface communicates with the radial ducts in the stator core.

Abstract: An induction motor is disclosed which utilizes a liquid in intimate contact with the rotor and stator conductors for cooling and yet minimizes the disadvantages of high rotational drag losses associated with conventional spray cooled motors. Cooling liquid is conducted through a hollow rotor shaft and directed to a cavity at the center of the magnetic length of the rotor. The cavity is formed by separating two adjacent rotor laminations. The cooling liquid flows axially from the central cavity toward the rotor ends through slots which contain the rotor conductors. A sealing band is provided around the rotor laminations to prevent cooling liquid from entering the air gap between the rotor and the stator.

Abstract: A cooling system for a rotary electric machine having a stator including a stator core and a stator frame for supporting the stator core and a rotor including a yoke, a plurality of salient magnetic poles mounted on the periphery of the yoke and shield plates bridging the tips of the adjacent magnetic poles wherein the cooling system comprises groups of air-discharging and air-charging ducts radially penetrating the stator core, each group of the ducts being axially aligned with a predetermined distance from each other and air-discharging windows formed in the shield plates at predetermined axial positions thereof, and the axial area of each group of the air-discharging ducts is larger than the axial area of the air-discharging window of the corresponding shield plate thereby increasing the flow rate of the cooling air through the rotary machine.

Abstract: According to the embodiment shown, the novel body assembly, for use as a principal component for a fluid cooler, comprises a body of annular configuration formed from a pair of mirror-image halves which are fastened together to form a fluid-conducting channel therewithin. Each of the mating halves has a multiplicity of heat-radiating fins or ribs on the surface thereof which defines an outer surface of the body assembly. Additionally, the halves of the body have fins on their opposite surfaces and, on assembly together, these latter are interleaved, and define an undulating channel through which the fluid to be cooled is conducted.

Abstract: A rotor assembly for a dynamoelectric machine is characterized by incorporating three different sets of rotor laminations each of which is provided with punched apertures that respectively form conductor slots arcuately spaced around the periphery of the laminae, a plurality of axial coolant passageways extending through the assembly near its inner diameter, a plurality of arcuately spaced radial ducts at axial intervals along the rotor, and vent passageways connecting the radial ducts to the axial coolant passageways to enable cooling air to be forced through the coolant passageways and the vent apertures into the radial ducts and thence into the air gap of the machine when the rotor is assembled in operating position. The rotor of the invention is particularly characterized by incorporating radial cooling ducts that extend between each adjacent pair of conductor slots from the periphery of the rotor to points substantially below the bottoms of the conductor slots in the rotor laminae.

Abstract: A leakage measuring apparatus and method is herein provided for a gas-cooled, liquid-cooled dynamoelectric machine's cooling system. The apparatus comprises: a liquid coolant reservoir; an integrating vessel; a flow restriction means such as an orifice, orifice covered by a porous membrane, or a needle valve; a pressure relief valve which is hydraulically connected between the liquid coolant reservoir and the integrating vessel; and means for gaging the pressure within the integrating vessel, said pressure indicative of the amount of leakage within the cooling system. The effect obtained by the gaging of the pressure in the integrating vessel is: (1) the integration of the pressure surges resulting from the intermittent activation of the pressure relief valve; and (2) the amplification, for gaging purposes, of the pressure changes in the reservoir, these changes caused by the existence of leakage.

Abstract: A laminated rotor for a dynamoelectric machine is formed by stacking a plurality of sets of punched laminae on one another to define axial coolant passageways, radial vents and coolant ducts and axial conductor-receiving slots through the assembled rotor. Each of the sets of laminae include a group of main rotor laminae, a group of vent laminae, a group of duct laminae and a transition lamina positioned between the vent laminae and duct laminae. In addition, a transition lamina is positioned between each set of stacked laminae thereby to arrange one transition lamina on opposite sides of each group of duct laminae, to effectively block molten metal from flowing out of the conductor slots into the coolant ducts of the duct laminae.

Abstract: Drip-proof type electrical rotating machine having inlets and outlets for air flow formed below a rotating shaft supported by a frame. The inlets are formed on end brackets located at both sides of a stator core, and cooling fans rotating together with the rotating shaft are provided on a rotor in opposite to both of the end brackets. Air guides are provided between the inlet and the cooling fans, each air guide being provided with an air passing hole. When the air guide is assembled into the frame, the distance from the axis of the rotating shaft to an above edge of the air passing hole is shorter than the distance from the shaft axis to an lower edge of the air passing hole.

Abstract: An electric motor, such as a rare-earth permanent magnet single airgap direct current motor is provided with generally longitudinally extensive heat transfer or cooling means comprising heat receptor elements adjacent but minimally spaced apart from and parallel the armature. These heat transfer elements are then cooled, as by being thermally connected with external heat discharging or dissipating structure to transfer the heat away from the motor. In one embodiment or modification the heat transfer elements project inwardly from a heat conductive end cap provided on its outer surface with heat radiating fins. In another embodiment or modification the heat transfer elements are hollow and a coolant, such as air, is circulated therethrough. The heat receptor elements may be provided with fins to increase their surface area, with the fins preferably facing the armature structure. The receptor elements are also preferably substantially coextensive with the active portion or windings of the armature.

Abstract: An improved air gap baffle is disclosed for a dynamoelectric machine of the type having an air-tight casing filled with a cooling gas, a stator core, a rotor defining an air gap with the stator core, and a means for recirculating the cooling gas through the stator core and the rotor. The baffle is an annular member which is disposed in the air gap between the stator core and the rotor for defining air gap zones having different cooling gas pressures and/or gas flow in opposing directions. The baffle comprises a flexible abradable member having a serrated tip in sealing relationship with the rotor. The baffle improves sealing between adjacent air gap zones by minimizing running clearances and by providing a labyrinth seal. The flexible nature of the baffle reduces the possibility of damage to either the baffle or the rotor during assembly and thereby allows the dynamoelectric machine to be assembled with minimal running clearances between the baffle and the rotor.

Abstract: A hermetic casing filled with a cooling gas contains a stator core having cooling ducts in radial direction, and a rotor comprised of a rotor body and an end-winding region and a fan for circulating the cooling gas. The cooled gas is divided into two flows at fan outlet by the dividing wall. One gas flow pressurized by the fan makes its way to the rotor end region and cools the same, and is discharged to the armature end region. The other gas flow pressurized by the gas goes to the stator core and the rotor body and cools the same, and then is discharged to the inlet side of the cooler. The two gas flows merge with each other at the inlet of the cooler, is cooled through the cooler, and reach the fan inlet region.