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: 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: 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 AC generator for a vehicle including a rotor with a fan, a stator disposed around the outer periphery of the rotor, and a frame. The stator includes a laminated core having a plurality of slots, a plurality of electric conductors in the slots, and an insulator. There is a gap between the electric conductors and the insulator in a diametrical section of the slots, and an area ratio of the gap with respect to the sectional area of the slots is not more than 25%. A portion of the electric conductor positioned within the slot has a substantially rectangular shape along the shape of the slot.

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 variable speed rotary electric machine comprises a stator having windings and a rotor having windings mounted within the stator for rotation about an axis; a cooling fluid inlet into a first end region of the rotor; at least one first fluid duct having an inlet orifice in the first end region of the rotor and an outlet orifice arranged to discharge fluid onto a first region of the stator windings; and at least one second fluid duct having an inlet orifice in an opposite end region of the rotor and an outlet orifice arranged to discharge fluid onto a second region of the stator windings. A flow path extends through the rotor from the first end region to the opposite end region, the rotor windings being in the flow path. The machine also comprises at least one third fluid duct having an inlet orifice in said opposite end region of the rotor and an outlet orifice.

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: 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: An alternator for a vehicle includes a field rotor having a pair of pole cores with a plurality of claw poles, a stator disposed around the rotor, and a frame for supporting the rotor and the stator. The frame has a plurality of air intake windows at axial ends thereof and a plurality of air discharge windows at circumferential portions thereof. The rotor has a cooling fan with a plurality of fan blades disposed at one end of the pair of pole cores. The number of the blades is smaller than the number of the claw poles.

Abstract: An improved design for a switched reluctance motor is disclosed that keeps the motor cool during operation and thereby improves the performance and reliability of the motor. The improved design employs three centrifugal fans mounted to the motor shaft, which are used to create two independent airflow paths, one of which cools the electronic components of the motor. The improved design also divides the functions performed by a single printed circuit board into two circuit boards, an upper circuit board and a lower circuit board. Another feature of the improved design includes locating the position/speed sensing encoder immediately below one of the centrifugal cooling fans. The disclosed construction provides for increased dissipation of heat that is generated by the motor and its electronic components. In this configuration, the printed circuit boards and other electronic components are located in such a manner that air can be circulated in a path to remove heat from these components.

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 rotor of a rotary electric machine has a pair of pole core members each of which has a core portion and a plurality of claw poles extending axially from outer periphery of the core portion. A plurality of magnet holders with permanent magnets are held therein and a connection member axially fixes the magnet holders to the pole core members. The connection member has a pair of end plates disposed at opposite ends of the rotor and a plurality of connecting rods extending axially to mechanically connect the magnet holders from opposite ends.

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: 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 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 pneumatically or electrically powered power tool having a rotating working implement carrying output spindle (14), an exhaust or cooling air outlet passage (21), air outlet openings communicating the outlet air to the atmosphere and comprising a first section (22) located on one side of the tool housing (10, 20) and a second section (23) located on an other side of the housing (10, 20), and an air outlet flow directing valve (25) shiftable between a first condition in which it directs the air flow out through the first opening section (22) and a second condition in which it directs the air flow out through the second opening section (23). The air outlet flow directing valve (25) is shiftable by a maneouver mechanism (35, 36) including a rotatable annular handle (35) on the outside of the housing (10, 20) between the first and second conditions in which it alternatively directs the outlet air flow through the first and second outlet opening sections (22, 23).

Abstract: A cooling arrangement for a high speed open rotor reluctance motor/generator apparatus of the type finding combination use in aircraft applications for engine starting and electrical energy generation in both normal and auxiliary power unit operating conditions. The cooling arrangement identifies fluid flow alternatives which include inlet region redirection of coolant fluid to improve its induction into rotor interpolar space, rotor movement-induced centrifugal pressurizing of coolant using simple and more complex structural elements, machine heating of the coolant fluid, kinetic energy extraction from heated moving coolant fluid and combinations of these arrangements in particular machine configurations. Use of the invention under extremes of machine energy levels and self heating in military and commercial aircraft environments are contemplated.

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 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: Ceiling fan motors which include forced air ventilation and heat dissipation systems to provide significantly reduced motor operating temperatures, improved motor component tolerances, lower manufacturing costs, and ease of assembly. The ceiling fan motor is of the inside-out type and includes an impeller mechanism associated with at least one of the upper or lower portions of the motor casing for drawing substantial volumes of air into the casing, across the stator, and through the opposite portion of the motor casing. The motor casing components may be formed from cast aluminum. Alternatively, the entire casing and rotor is of unitary integrally cast aluminum. One of the end faces of the motor casing may include integrally cast blade ramps.

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

Abstract: A blower assembly includes a motor cover having (1) a body portion defining a motor cavity, (2) an air flow guide surface connected to an end of the body portion, the guide surface extending radially outwardly from the body portion, and (3) a cooling duct integrally formed with the body portion and having an inlet and an outlet, the inlet being located at the end of the body portion and the outlet being defined in a sidewall of the body portion. The blower assembly further includes a motor positionable in the motor cavity, the motor having a motor shaft having a central axis. In addition, the blower assembly includes a fan housing is connected to the motor cover, wherein (1) the fan housing defines a scroll cut-off line, and (2) a plane passes through the scroll cut-off line and the central axis, and (3) the cooling duct is positioned adjacent to the plane.

Abstract: A fan end bracket for a motorized fan assembly has a plurality of curvilinear tapered air passages. Each air passage includes a flow port, such that air being moved by a rotating fan assembly is directed through the air passages and the flow ports. A skeletal motor assembly is affixed to one side of the end bracket such that the motor shaft is disposed through a shaft aperture in the end bracket. A rotating fan member is affixed to the motor shaft adjacent to the other side of the end bracket. A shroud member is provided to shroud the rotating fan member so as to cause the flow of air to be directed through the air passages. A baffle plate is interposed between the rotating fan member and the end bracket. The baffle plate includes a plurality of curvilinear scallops which correspond to the air passages in the end bracket.

Abstract: An outer-rotor type electric rotary machine comprises a shaft fixed to a stationary unit, a motor stator, a motor rotor, a cylindrical rotor frame, and first and second brackets attached to rotary members, respectively. At least one of the first and second brackets includes a plurality of heat-radiating fins mounted on its outer peripheral surface, and a plurality of heat-absorbing fins mounted on its inner peripheral surface.

Abstract: In order to provide a power recovery plant comprising a gas turbine with a turbine wheel and a generator with a rotor driven by the turbine wheel, in which the known bearing problems are diminished or even cease, it is suggested that the turbine and the generator be combined in a plant housing to form one unit, that the turbine wheel and the rotor form a rotor unit rotating as a whole and that the rotor unit be rotatably mounted in the plant housing by magnetic bearing units in a non-contact manner.

Abstract: A blower for cooling an internal combustion engine of a power vehicle comprises an electric drive motor having a housing with slots for ventilation, and a series resistance provided on an outer side of the housing at a distance from the latter and covering the slots, the series resistance being connectable with and disconnectable from a working current circuit of the drive motor.

Abstract: A dynamoelectric machine has a stator with a stator core and a plurality of spaced apart radially extending ventilation ducts. A rotor mounted for rotation within the stator has a shaft with a plurality of salient poles. Each salient pole has a winding on it and each pole with its winding constitutes a pole member. Adjacent pole members define between them an interpolar space. Cooling air enters each interpolar space from each end when the machine is operating, moves generally axially as portions of the air change direction to move radially outwards through the air gap separating the rotor and stator and then through the ventilation ducts. The air flow, in a radial outward direction, tends to be less at the ends of the rotor and through the ventilation ducts adjacent the ends of the stator. The invention places a baffle at each end of each interpolar space.

Abstract: A vehicular AC generator comprising a magnetic pole core secured to a shaft and excited by an excitation coil, the magnetic pole core having opposite end faces, a stationary core surrounding the magnetic pole core and having mounted thereon a stationary coil, and a front and a rear bracket supporting the stationary core and rotatably supporting the shaft through bearings. The front and rear brackets having ventilation openings defined therein, and a fan mounted to each of the opposite end faces of the magnetic pole core is provided for generating flows of cooling air through the ventilation openings in the front and rear brackets, An inlet opening side end portion of a blade of the fan that overlaps the inlet opening has a radially length dimension which is equal to or less than 50% of radial legnth dimension of the inlet opening side end portion.

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

Abstract: An electric vehicle which has motor wheels of the direct-drive outer-rotor type which permit simplification and compaction of the motor wheels. Current regulating covers introduce ambient air for cooling the motors and reduce air resistance, and batteries and control devices are disposed symmetrically relative to the axial line of the vehicle body and to axial lines of the axles so as to reduce and uniformly distribute the weight of the vehicle. All these devices contribute jointly to increasing the range of the electric vehicle.

Abstract: An eddy current power absorption unit has a particular cooling system which alleviates overheating of the unit and its individual components. Cooling conduits comprising a plurality of meandering paths, each including axially oriented flow lines, are disposed close to the heated components to uniformly remove heat therefrom. The flow velocities at the entrance and exit of the meandering flow paths are generally equal to one another.

Abstract: A portable engine-operated electric generator includes an engine having an output shaft and including heated and unheated components required for operation of the engine, a generator unit having an input shaft and drivable by the engine, the engine and the generator unit being vertically arranged, the output shaft of the engine and the input shaft of the generator unit being coupled to each other in axial alignment in a vertical direction, and a sound insulating case accommodating the engine and the generator unit and having a horizontal longitudinal axis. The heated and unheated components are separated from each other by, and located on opposite sides of, a plane lying in the vertical direction and in a direction normal to the horizontal longitudinal axis.

Abstract: A conductor bar in a dynamoelectric machine includes a coolant channel having a depressed portion passing under a gusset reinforcing a joint with an end turn. The end turn also includes a coolant channel with a depressed portion under the gusset and meeting the depressed portion in the conductor bar. The gusset includes a groove therein, generally congruent with the two depressed portions passing thereunder. Diagonal entry and exit portions on the underside of the gusset reduce flow turbulence of coolant entering and exiting the flow channel defined between the gusset and the two depressed portions. In a further embodiment of the invention, a diagonal portion joining the two depressed portions, matched with a congruent shape in the gusset, both reduces flow resistance and increases an area available for brazing the gusset in place.

Abstract: In an engine generator having a work generator arranged at the upper side of an engine of a vertical crank shaft type, the output shaft of the engine projects upwards from the engine crank case so as to be connected to the rotor of the work generator. And the stator is arranged so as to encircle the rotor and to be encircled by an air induction casing. A cooling fan of a centrifugal blower type is located at the upper end of the rotor shaft with the blades thereof directed to the side of the generator so as to supply a cooling air flowing upwards to both the interior and the exterior of the stator during operation.

Abstract: In a rotary compressor for refrigerants of the type having, within a sealed case, a refrigerant compressing device and a motor disposed thereabove for driving the same and having a vertical rotor shaft, an oil-separating member of umbrella shape with a downwardly-directed peripheral rim is disposed coaxially above and fixed relative to the top end of the rotor and functions to guide compressed refrigerant containing lubricating oil particles toward and through the motor windings of the motor thereby to separate the oil particles from the refrigerant, which is then delivered under pressure.

Abstract: An electric motor has stator coils extending longitudinally past an end of its rotor so that the end turns and at least a portion of the inner side of the stator coils are exposed. A fan is disposed inside the motor shell between a first air passageway and the stator coils. The fan is secured to and driven by the rotor shaft to cause a flow of cooling air to pass over the stator coils when the motor is in operation. The fan has a number of vanes extending outwardly from a hub to a circumferential ring, which ring defines a central opening of the fan. The central opening extends past the vanes from the front to the rear of the fan so that the rear of the fan is relatively open. The inner surface of the ring is smoothly curved outwardly and rearwardly from the front of the central opening to direct air which enters the central opening toward the stator coils. The vanes are disposed adjacent the exposed portions of the stator coils to cause turbulent air flow along the exposed portions.

Abstract: Disclosed is an improved rectifier assembly for use in a rotor of a dynamo electric machine which includes a tubular housing receiving a stack of plates sandwiching diode wafers between studs on certain of the plates and confined by annular ridges on others of the plates. The plates are provided with coolant passages with the coolant passages on adjacent plates being staggered to provide improved impingement cooling.

Abstract: To counteract the effects of centrifugal force on internal blades or vanes positioned in gaps (31) between adjacent claws (22, 23) of a claw-pole rotor (R) of a claw-pole alternator, a plastic sleeve (33) is fitted over the field winding (20) and has cooling fins or vanes or blades (32) projecting radially therefrom, at an inclination with respect to the axis of rotation of the rotor, and located between the inclined faces of the claw poles. The end portions (36, 37) projecting beyond the sleeve may be straight (FIG. 4) or the end portions (38, 39) may be curved (FIG. 5). Preferably, a curable casting compound is cast within the sleeve and secures the winding (20) in position, the sleeve being fitted in form of a circular bandage over the winding.

Abstract: An AC generator for vehicles has a cooling fan secured to one end face of a rotor core, 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, so that 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 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: To limit the maximum speed of the fan blade of an automotive-type alternator, the fan blade (21) is secured to the outer race (23) of a ball bearing (22) having a two-part inner race (24, 25), one of the parts being an axially slidable sleeve (25) which is spring-pressed by a cup spring (26) in engagement with a drive pulley (18) against the first race (24). Until a certain limiting reactive pneumatic force or frictional force is reached, the cup spring (26) will clamp the balls (22) between the inner and outer races, so that the fan blade (21) will rotate with the pulley; when the reactive force and speed are exceeded, however, the fan blade can rotate about the balls (22), and hence slip with respect to the rotation of the pulley (18).

Abstract: An electric rotary machine including a stationary armature coil, and a rotor for generating a rotary magnetic field, wherein the armature coil is formed with slits arranged radially and each located between segments of the coil which are arranged radially, and the armature coil is supported with radial gaps at outer and inner peripheral edges of the armature coil, so that thermal strain in the coil can be released through the slits, gaps, and a resilient insulator, and thermal stresses can be prevented from developing. By utilizing the rotation of the rotor, air is introduced from outside to a central portion of the armature coil, from which it is allowed to flow radially outwardly along the armature coil, to thereby suppress a rise in the temperature of the armature coil.

Abstract: An electric generator for a vehicle has a rotary generator shaft, a generator rotor mounted on the shaft and having a field winding, a bracket surrounding the generator rotor and having the generator shaft rotatably journalled therein, an inductor fixed to the bracket means and having an energizing coil with a plurality of poles, and an induced member rotatably mounted on the rotary generator shaft and opposed to the inductor with a minute gap therebetween, so as to be coupled to the inductor by an electromagnetic force when the energizing coil receives current from the generator. The generator stator is disposed around the generator rotor and has an armature winding with a number of poles exceeding twice the number of poles of the inductor and for generating an AC output usable for supplying power to a load outside the generator. The energizing coil is connected to the armature winding for receiving a part of the AC output for energizing the energizing coil.

Abstract: A bearing cooling mechanism for a vehicular A.C. generator including a rotor having a rotary shaft rotatably mounted to a frame through two opposite bearings comprises a pulley and a cooling fan fixed in overlapped relationship on the rotary shaft at one end protruding from the adjacent bearing and, in addition to holes disposed on both end surfaces of the frame, four ventilating holes extending at equal angular intervals through those portions of the overlapped pulley and cooling fan adjacent to the rotary shaft.

Abstract: A vehicular generator with at least one cooling fan, wherein a plurality of blades of the cooling fan are made of a shape memorizing alloy, whereby, especially in medium and high revolution speed operations and low electric loads in which cooling air is not required, the blades are flattened, thereby preventing the rotational efficiency of the generator from falling and reducing noise ascribable to the cooling fan.

Abstract: To separate cooling fluid, such as water, from the commutator space of a dynamo electric machine, typically a motor for battery-energized vehicle, a disc (18) of insulating material is fitted on the commutator (5), terminating at its end portion in a slinger structure (20, 21) which is positioned in intergaging relation with respect to a labyrinth (21, 22) secured to the housing of the machine. Cooling fluid is admitted to the space within which all the electrical windings (3, 9) are located, so that the cooling fluid, for example water, can fill the space (28) of the housing, while being separated from the space (57) within which the commutator (5) and commutator brush holder (7) is located.

Abstract: An arrangement for cooling the field winding of an electric machine to be deep cooled is provided with a rotating mixing chamber containing vaporous and liquid coolant and with a centrifugal pump between areas of different temperatures to pump gaseous coolant out of the mixing chamber. The maximum flow cross section of the colder line part of the centrifugal pump is at the most half the size of the maximum flow cross section of the warmer line parts and/or at least the end piece of the colder line part is thermally coupled to colder parts of the rotor to prevent pump instabilities caused by coolant convection.

Abstract: A unitary fan and drive assembly is formed by means of a disc-shaped plate having a set of fan blades disposed along the periphery of the plate. A compact shape is provided by forming the drive with a rotatable member that is nested within a central recess of the plate. An electric drive is conveniently implemented by an electric motor wherein the rotatable motor member has fan blades disposed along the periphery and wherein the stationary motor member includes a low-profile annular array enclosing an assembly for electrically energizing the motor.