Abstract: A cooling gas ventilation circuit is provided for an end winding of a rotary machine having a rotor of the type having a plurality of radial slots and a plurality of coils respectively seated in the radial slots, the coils extending beyond a pole face of the rotor to form the end winding. The ventilation circuit is composed of first and second cooling gas passages, respectively defined in at least one turn of each coil of the end winding. Each first cooling gas passage extends from an inlet port in communication with a cavity on one longitudinal side of the turn to an exit port defined on the other longitudinal side of the turn. Each second cooling gas passage extends from an inlet port in communication with the cavity on the one longitudinal side of the turn to an outlet in the form of a radial chimney defined through a plurality of the turns of the coil within the respective radial slot.

Abstract: An elevator hoist apparatus comprising the ventilation passage within a motor frame that includes an inlet suction port at one end, a flow passage extending through the motor and upper and lower discharge ports at the other end of the motor frame. The upper discharge port is at a position above the horizontal plane including the motor axis by 45 degrees and the lower discharge port is at a position below the horizontal plane. A blower is connected to each discharge ports, thereby generating a substantially uniform flow of cooling air within the motor frame. Therefore, the flow of cooling air generated within the motor frame is substantially uniform, eliminating stagnation region and uneven cooling, improving the cooling efficiency. Also, since two blowers are disposed both above and below the horizontal plane H, the load on a single blower is small, allowing a small-sized blower to be used and the overall size of the elevator hoist apparatus can be made small.

Abstract: A cooling jacket assembly for cooling the stator of an electric machine. The assembly includes an annular cooling jacket body comprising coaxial inner and outer cylindric shells, heat transfer fins in the annular space between the inner and outer shells defining coolant flow channels, and end caps connected to opposite ends of the inner and outer shells. Coolant flows through an inlet in one of the end caps and is directed through the flow channels along at least one serpentine path to an outlet. The serpentine path comprises a plurality of parallel sections extending axially of the cooling jacket body. In one aspect of the invention, each section of the serpentine path comprises a group of two or more flow channels defined by a plurality of adjacent fins.

Abstract: A rear-end is constructed so as to have greater capacity than a front-end fan. The construction is such that a flow rate in a front-end ventilation pathway in which a cooling air flow enters through front-end air intake apertures is deflected centrifugally by the front-end fan and is then expelled through front-end air discharge apertures is greater a flow rate in a rear-end ventilation pathway in which a cooling air flow enters through rear-end air intake apertures is deflected centrifugally by the rear-end fan and is then expelled through rear-end air discharge apertures.

Abstract: A motor cover arrangement for covering a cooling fan of a motor enclosed in a motor case, wherein the motor cover arrangement includes a cooling fan cover and an air intake hood. The cooling fan cover is partially constructed by a bowl shape cover body and an arc shape guiding frame having a guiding lip integrally extended therefrom for regulating air sucking from an air intake window and discharging from an air discharge slot. Therefore, the discharging air and the intaking air are respectively partitioned by the guiding lip to prevent the discharging air from returning back into the motor, so as to enhance the circulated motion of the air cycle in the motor cover arrangement and increase both the air sucking effect and cooling effect of the motor.

Abstract: A fluid-cooled switched reluctance motor, comprised of a stator having a plurality of evenly spaced, radially oriented, like stator poles that define a gap between adjacent stator poles. The stator poles have side walls that are dimensioned wherein adjacent side walls on adjacent stator poles are parallel. Windings are wound about the stator poles, adjacent windings forming a slot of uniform cross-section therebetween. A rotor element is mounted for rotation relative to the stator. The rotor has a plurality of equally spaced, radially oriented like rotor poles. An elongated cooling tube is disposed within each of the slots defined between the windings. The cooling tube has a first end and a second end, and is dimensioned to essentially fill the slot between adjacent windings. A first coolant chamber is disposed at a first end of the stator, and a second coolant chamber is disposed at a second end of the stator.

Abstract: A retaining ring for a rotor assembly, the retaining ring adapted to constrain field winding end turns arranged in a rotor body, the retaining ring comprising axially inboard and outboard ends and radially inner and outer surfaces, the radially outer surface at the axially inboard end having an aerodynamically smooth spline shape defined by compound radii that merge into a rounded nose portion.

Abstract: A rotating machine having a core and being equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near the rotating axis. The coolers are installed in a ventilation passage for the cooling medium and comprise a primary cooler installed in a primary ventilation passage extending from the exhaust side of a fan installed near the rotating axis to the suction side of said fan via the core, and a secondary cooler installed in a secondary passage that is branched from the primary ventilation passage.

Abstract: A rotating machine equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed on the rotating axis. The coolers includes two or more coolers installed in a ventilation passage for the cooling medium. At least part of the cooling medium cooled by one cooler is further cooled by another cooler.

Abstract: A rotating machine having a stator core and being equipped with coolers for cooling a cooling medium which is circulated inside the machine by the rotation of a fan installed near the rotating axis. The coolers are installed in a ventilation passage for the cooling medium and comprise a primary cooler installed in a primary ventilation passage extending from the exhaust side of a fan installed near the rotating axis to the suction side of the fan via the stator core, and a secondary cooler installed in a secondary ventilation passage extending from the exhaust side of the fan in the primary ventilation passage to the inside of the inner surface of the stator core via the stator core.

Abstract: An apparatus (10) and method for applying air to cool an electrical power generator (15) is provided. The apparatus (10) preferably includes a housing (12), a power generator (15) positioned in the housing (12), and a heat transfer device (20) positioned within the housing (12) and adjacent and in fluid communication with air contacting the power generator (15) for receiving relatively hot air from the electrical power generator (15), transferringly cooling the relatively hot air with relatively cooler air received from outside the housing (12) without allowing the relatively hot air to contact and mix with the relatively cooler air, and supplying cooled air from within the housing (12) to the power generator (15).

Abstract: In an AC generator for a vehicle, a housing is formed at one end thereof with an end plate portion, a plurality of axial cooling liquid passages are provided in a body portion of the housing, and a circumferential cooling liquid passage and a radial cooling liquid passage each connecting the axial cooling liquid passages adjacent to each other are provided in an axial end face of the housing and the end plate portion, respectively.

Abstract: An electrical machine formed as claw pole generator has a ring-shaped stator provided with windings, a claw pole rotor rotatably arranged inside an opening of the stator, the claw pole rotor having a rotor shaft and an exciter coil arranged coaxially to the rotor shaft, the claw pole rotor also having a peripheral surface provided with a plurality of claw poles which overlap the exciter coil and engage in a finger-like manner with groove-shaped intermediate spaces, at least one axially acting fan units arranged at an end side of the claw pole rotor in a region of an outer periphery, and a plurality of honeycombed structures located in the intermediate spaces and extending in a longitudinal direction of the intermediate spaces so that a cooling medium flows through the structures.

Abstract: In a generator with a cooling system which draws in, from the generator, cooling medium heated by the heat-generating elements of the generator and which guides the hot cooling medium to at least two cooling units (23), which cooling units (23) operate in parallel and cool the cooling medium before it is led back to the heat-generating elements of the generator, operation substantially uninfluenced by failures of the cooling units (23) is made possible by means being provided which mix together the cooling medium flows (31) flowing from the different cooling units (23) after they emerge from the cooling units (23) and before they are supplied to the heat-generating elements of the generator.

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

Abstract: An improved cast motor housing for medium to large motors is integrally formed with at least one conduit embedded in the housing for carrying a circulating heat removal fluid. The housing has a substantially cylindrical housing wall formed from a thermally conductive material. The fluid conduit is disposed within the housing wall intimate thermally-conductive contact with the wall material. The conduit may be formed of a sturdy, thermally conductive material. The conduit is arranged within the housing wall to extend along substantially the entire longitudinal and circumferential dimensions of the housing, and may be formed as a multi-turn helix. For larger motors, multiple conduits may be provided. The motor housing is formed by casting. A cylindrical casting core has a set of longitudinally-extending channels located at regular angular intervals along its circumference for supporting the conduit during the casting process.

Abstract: In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (1) and into the shaft (3) of the rotor, over the entire length of the stator and the rotor. A pump (15) is incorporated in the rotor shaft. The liquid is injected into the pump by a stationary axial tube (16) and comes out again between the shaft and this tube. The pump includes a centrifugal pumping member (20) fixed to the bottom of the bore of the shaft, and longitudinal-blades (21) fixed to the shaft facing an external helicoid rib (17) of the injection tube. The liquid is cooled by the ambient air along the periphery of the stator.

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

Abstract: The coil-end portions of an armature winding are disposed around cooling fans and closely, and outer coil ends of the coil-end portions are disposed to be close to alternator frames via insulating layers. The coil ends are spaced apart from one another except the base portions, and the resistance of cooling air draft inside the coil-end portions is lower than that around the coil-end portions so that the cooling air mainly passes through the inside of the coil-end portions.

Abstract: A motor-driven tool is provided with a grip on which a switch is placed, and the grip is coupled to the middle of a cylindrical housing which houses a motor in its rear end and a motor output decelerator in front of the motor in its front end. A deceleration rotation output shaft is provided in the front of the housing. The motor houses an axial flow fan for air intake in the rear and a centrifugal fan for exhaust in the front and has intake air openings in the rear side and an exhaust air opening in a front side surface. The cylindrical housing also has an intake opening that connects to the intake air opening in the rear side of the motor and an exhaust opening that connects to the motor exhaust air opening at the position where the front of the motor is located.

Abstract: In previously known turbogenerators, the cooling-air chambers are included in the structural configuration of the generator casing. In order to avoid complex manufacturing processes, it is intended that the chamber be a box that is separate from the generator casing. The box has an opening on its side facing the built-in stator with an edge surface of the opening being fitted with a sealing element that acts with respect to the circumferential surface of the built-in stator. The box is connected to the built-in stator with the interposition of a rubber bearing.

Abstract: In a generator which is operated according to the induced-draft-cooling principle and in which a main fan (11), attached to the rotor shaft (12) of the generator, draws cooling medium, which is heated by the heat-generating elements of the generator, out of the generator and transports it essentially perpendicularly to the axis of this rotor shaft (12) to a cooling arrangement (23), the drawn-in cooling medium, which is expelled with a swirl at high velocity by the main fan (11), being received by a cooling-duct casing (33), which directs the cooling medium to the cooling arrangement (23) via at least one fluidic constriction (41), the directing of the cooling medium, while efficiently avoiding vortices and pressure drops, is achieved in that the cooling-duct casing (33) has at least one overflow duct (66), which receives the cooling medium, expelled into the cooling-duct casing (33) by the main fan (11), via an inflow zone (58) upstream of the constriction (41), diverts the cooling medium around the constric

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: In a motor having a cylindrical stator fixed to a motor housing and inner and outer rotors concentrically arranged to the stator, a cooling structure of the motor includes cooling jackets formed in the stator. Coolant inlet and outlet ports are provided at an axial end of the rotor which end is opposite to an output end portion of the outer rotor. The coolant inlet and outlet ports are connected to the cooling jackets to supply and discharge coolant to and from the cooling jackets. A coolant return portion is provided at the other axial end of the rotor and connects each pair of the cooling jackets.

Abstract: A rectifier accommodating portion, a condenser accommodating portion, a regulator accommodating portion and a connector accommodating portion are recessed on the inner surface of a rear bracket, and baniers which constitute a cooling air passageway are integrally made to protrude axially from the surface of the inner wall of the rear bracket so as to separate between each accommodating portion. Further, intake openings and a connector receiving hole are provided through the rear bracket so as to communicate the rectifier accommodating portion, the regulator accommodating portion and the connector accommodating portion from the exterior while a plurality of exhaust openings are provided through the outer circumference in the circumferential direction.

Abstract: A rotary electrical machine (1) has a least one stator (23). The stator is provided with at least one radial channel (107) for ducting cooling air. The channel (107) extends between a first position (113) at or substantially near the rim (109) of a winding region of the stator (23) and a second position (119) at or substantially near the center (51) of the winding region. The machine (1) has cooling means (91-97) for causing cooling air to enter the radial channel (107) via the second position (119) and exit via the first position (113). The stator may have electrical windings arranged as coil sectors (183-197) disposed substantially equi-angularly in a generally circular pattern. At least some of the coil sectors are wound in a generally spiral fashion when viewed axially. A rotor (13), for the machine may have a plurality of equi-angularly spaced magnets (127), which are generally circular but with a cut-away portion, when viewed axially.

Abstract: A form fitting motor cover (1) for TEFC motors having a cylindrical body with a periphery of 255 degrees which when flexed outwardly can be placed over a motor (4) casing and upon release will cause said cover to adhere to, and form around said motor casing to keep debris, splash and spray off of motor casing and improve efficiency of air flowing between the cover and the motor cooling fins (6). The motor cover has at either or both ends of the motor an attachable covering end plate (3) and a conduit box cover (2) which can be attached to the cover by any suitable method.

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 rotor winding for an electrical machine, in particular an air-cooled turbogenerator, includes a rotation axis and a multiplicity of electrically conductive turns which are stacked radially relative to the rotation axis and form a plurality of axial sections and tangential sections. Each axial section is formed approximately in a straight line, is aligned approximately parallel to the rotation axis and has first cooling channels which are aligned meridionally relative to the rotation axis and pass through all of the turns. Each tangential section is bent about the rotation axis, connects two axial sections to one another and has associated second cooling channels, each of which is located in the interior of a respective turn. If required, third cooling channels, each of which is constructed in such a way that it meanders meridionally, are provided at the axial sections.

Abstract: A motor vehicle alternator has a casing carrying a stator, with a rotor of the interleaved-claw type mounted rotatably within it. Air inlet ports are provided in the casing of the machine, on one side, and air outlet ports on the opposite side, to allow cooling air to flow through the machine. The air inlet ports are situated closer to the axis of rotation of the rotor than the air outlet ports. In this way, rotation of the rotor produces a flow of air through the machine by centrifugal effect. The alternator may then be made without any ventilating fan.

Abstract: Disclosed is a rotatable inverter. The rotatable inverter comprises a rotatable inverting means for inverting a DC power source to an AC power source by means of a rotational force, and a transformer which receives the AC power source inverted by the rotatable inverting means and outputs a predetermined higher voltage. The rotatable inverting means comprises a motor generating the rotational force, a commutator driven by the motor and a plurality of brushes which are respectively contacted with the outer surface of the commutator. The commutator comprises a cylindrical body made of an insulating material, and conductive parts which are divided into an even-number by non-conductive parts, respectively, having a desired width. Further, it is preferable that the cooling fan is coupled to the motor along with the commutator.

Abstract: A motor cooling and sound absorbing system includes a housing (10) forming a chamber (13) around a motor (11). The shaft (12) of the motor (11) carries a fan (40) positioned in a chamber (38) formed by a recess (36) cut in a foam block (35). The fan (40) draws air into the chamber (13) through inlet apertures (33) in the housing (10) and this air is directed past the motor (11) to cool it. The air exits the fan (40) generally radially against an angled surface (37) of the recess (36) of the foam block (35). The air is then received in a diffuser passageway (41) defined by the angled surface (37) and an angled surface (42) of a choke plate (19) positioned above the foam block (35). The diffuser passageway (41) reduces the velocity of the air to assist the foam block (35) in absorbing the noise generated thereby, while at the same time reducing the pressure at the exit of the fan (40) to increase the cooling air flow past the motor (11).

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: 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: A motor assembly is disclosed in which a motor is rotationally connected to an impeller for producing a fluid flow, preferably an air flow. A venturi passage is provided for conducting a high velocity air jet from the air flow. A baffle is configured to the venturi passage to draw an air wash over the motor to provide cooling, without a separate cooling fan.

Abstract: The present invention relates to an arrangement in a bulb generator (G), comprising a generator housing (1, 10, 110, 210, 310, 410) arranged in a water flow for letting turbine water flow there along and towards the turbine (4), which arrangement comprises means for removing surplus heat generated during operation of the generator, which mean comprise elements which are assembled as flow channels for coolant and/or heated generator air for indirect or direct cooling of the generator air, and for the purpose of providing a cooling system which to a large degree is independent of the quality of the river water or turbine water, and which also comprises elements which are non-costly as regards manufacturing and assembly, it is according to the present invention suggested that said means (111; 411) comprise, as known per se, extruded elements, especially elements which either comprise channels or by assembly define channels (112; 412) for circulating coolant, especially circulating air, or any other appropriate c

Abstract: A vehicle alternator includes a case having a pair of brackets placed back-to-back, in which ribs are disposed, which define ventilation windows (29; 74) in a bracket body. The ribs serve as heat passage members (54, 60; 73), which have higher thermal conductivity than the bracket body and are partially embedded in the bracket body. Therefore, heat resistance in the heat transfer passage between the stator and the ventilation windows is reduced, and heat generated by the stator is expelled efficiently from the ventilation windows to the outside air, and the temperature of the stator can be reduced.

Abstract: A motor-driven tool is provided with a grip on which a switch is placed, and the grip is coupled to the middle of a cylindrical housing which houses a motor in its rear end and a motor output decelerator in front of the motor in its front end. A deceleration rotation output shaft is provided in the front of the housing. The motor houses an axial flow fan for air intake in the rear and a centrifugal fan for exhaust in the front and has intake air openings in the rear side and an exhaust air opening in a front side surface. The cylindrical housing also has an intake opening that connects to the intake air opening in the rear side of the motor and an exhaust opening that connects to the motor exhaust air opening at the position where the front of the motor is located.

Abstract: An alternator for a vehicle includes a fan for supplying cooling air along an inner circumference of coil-end groups disposed opposite ends of a stator in an axial direction. Each of the coil-end groups is composed of a plurality inner coil-end portions disposed at an inner circumference of the coil-end groups to extend from an end of the stator core and outer coil-end portions disposed at an outer circumference of the coil-end groups to extend from an end of the stator core. The inner coil-end portion extends in a direction between the axial direction and rotating direction of the rotor.

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

Abstract: The coil-end portions of an armature winding are disposed around cooling fans and closely, and outer coil ends of the coil-end portions are disposed to be close to alternator frames via insulating layers. The coil ends are spaced apart from one another except the base portions, and the resistance of cooling air draft inside the coil-end portions is lower than that around the coil-end portions so that the cooling air mainly passes through the inside of the coil-end portions.

Abstract: The aim of the invention is to design a rotary electric machine, in particular a high-speed motor, whose cooling system ensures that the heat generated is eliminated without a non-uniform heat distribution building up in the motor. The motor has cooling ducts (5) in the stator (2), between the bundle of laminations (3) and the housing (4). Located on the housing (4) are connections (6) for the supply of the coolant and connections (7) for the discharge of the coolant. A two-phase mixture is used as the coolant for the housing. If the bundle of laminations (3) gives out heat uniformly in all directions, evaporation will take place continuously round the whole of the casing. The motor also has as second coolant circuit. Gaseous coolant is fed in through another set of connections (8) to cool the rotor. This gaseous coolant passes through ducts (9) in the bundle of laminations (3) and into the air gap (10) between the rotor (1) and the bundle of laminations (3).

Abstract: An improved cast motor housing for medium to large motors is integrally formed with at least one conduit embedded in the housing for carrying a circulating heat removal fluid. The housing has a substantially cylindrical housing wall formed from a thermally conductive material. The fluid conduit is disposed within the housing wall intimate thermally-conductive contact with the wall material. The conduit may be formed of a sturdy, thermally conductive material. The conduit is arranged within the housing wall to extend along substantially the entire longitudinal and circumferential dimensions of the housing, and may be formed as a multi-turn helix. For larger motors, multiple conduits may be provided. The motor housing is formed by casting. A cylindrical casting core has a set of longitudinally-extending channels located at regular angular intervals along its circumference for supporting the conduit during the casting process.

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: 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: An electric motor comprises a flange at one end, the corner portions of the flange projecting over the outline of the stator. A ventilator is provided at the opposite end, having outlets which are in alignment with the corner portions. The ventilator does not project over the borderline of the flange.

Abstract: In an air-cooled electrical machine having reverse cooling in a closed cooling circuit, a two-stage blade cascade for the optimum incident flow of cooling air to the rotor (4) and the rotor winding (29) is provided between a rotor cap plate (22) and a rotor shaft (28). The first blade cascade stage (30b) in the direction of flow is a deceleration cascade having essentially pressure-generating properties, and the following blade cascade stage (30a) in the direction of flow is a deceleration cascade having essentially deflecting properties. The flow cascade is provided radially on the inside with a sealing shroud band (32).

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 dynamoelectric machine is provided with an arrangement in the form of a plurality of cooling tubes disposed in or adjacent the stator core of the machine and through which a coolant is caused to flow. The coolant tubes extend axially with respect to the rotor of the machine and are spaced around the circumference of the stator. In order to regulate the cooling efficiency and reduce the coolant pressure loss in the coolant tubes, a branching arrangement in combination with a valve arrangement is disposed in at least one of the end brackets of the machine to control the flow of coolant in parallel selectively through different combinations of cooling tubes. The branching arrangement includes a plurality of circumferentially disposed chambers which communicate with respective groups of cooling tubes in parallel, and the valve arrangement allows connection of these chambers selectively in different combinations to a coolant supply and a coolant exhaust.

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.