Abstract: A compatible, gellable, dual resin system useful for impregnating porous spacers between stator end windings of turbine generators is made from (A) a liquid diallyl isophthalate component comprising an admixture of liquid diallyl isophthalate monomer and solid diallyl isophthalate prepolymer, where the weight ratio of monomer:prepolymer is between about 1.5:1 and about 3.0:1, (B) an amount of chain forming isocyanate terminated polyurethane prepolymer effective to provide a chain network which physically interpenetrates the liquid diallyl isophthalate component, and prevents free flow of liquid diallyl isophthalate component, (C) a chain extender for the isocyanate terminated polyurethane prepolymer, and (D) a catalyst for the diallyl isophthalate component, where the resin system is curable with the application of heat.

Abstract: Disclosed is a dynamoelectric machine stator winding having a plurality of coil sides of varying lengths disposed in a plurality of slots located around the inner periphery of a tubular stator core. Top and bottom coil sides (radially inner and outer positions) of unequal length are placed within the slots and interconnected such that top coil sides are joined to bottom coil sides disposed in other slots when the top coil sides, as dictated by winding topology (for phase interspersed connector ring segments), are longer than the commonly slotted bottom coil sides. When the bottom coil side in a subject slot is longer than the commonly slotted top coil side, the top and bottom coil sides are lengthened and shortened, respectively, and the top and bottom coil sides in the subject slot are respectively joined to top and bottom coil sides on both axial ends of the stator.

Abstract: A multiphase stator winding for a dynamoelectric machine constituting a plurality of coil loops each of which have a plurality of coil sides of varying lengths that are embedded in stator core slots. Each coil loop has two straight coil sides embedded within the stator slots and an annular connector ring segment which connects the two straight coil sides in an end region of the stator. The connector ring segments are interspersed in the axial direction so that connector ring segments of identical phase are separated by connector ring segments of other phases.

Abstract: Dynamoelectric machine stator assemblies are disclosed in which end turns of the different windings are separated by winding end turn insulating portions of a plurality of individual phase insulators. The end turn insulating portions of the phase insulators are disposed in overlapping pinwheel configuration with overlapping portions of the insulators being disposed adjacent each other along the entire extent of the overlap.

Abstract: A resin impregnated spacer, useful for bracing electrical conductors, comprises a porous, flexible, heat resistant material impregnated with an epoxy resin containing Lewis acid curing agent and an effective amount of dibutylphosphite.

Abstract: In a rotary electric machine including a stator core and a stator winding received in slots of the stator core, a cooling medium baffling device is provided which comprises a cooling medium baffle plate fixed to the inner peripheral edge of one end of the stator core by mounting bolts protruding axially from the end of the stator core, wherein the circumferential position of each of the mounting bolts is displaced from the circumferential position defining the boundary between the different modes of phase currents flowing through the coils constituting the stator winding, thereby effectively eliminating generation of excessive heat due to excessive eddy current losses occurring locally at the end of the stator core.

Abstract: A pressure plate for a liquid-cooled electric machine is disclosed which improves heat removal from the end-face region of the stator lamination stack. The pressure plate is provided with a cooling canal formed by a recess on the surface facing the stator lamination stack which is closed off by a cover plate. The cover plate may be provided with a rib on the surface facing the recess. In one embodiment, a plurality of juxtaposed recesses are provided which extend transversely to the pressure fingers of the pressure plate. The pressure plate is preferably made of stainless, non-magnetic steel, i.e., of austenitic chrome-nickel steel.

Abstract: In a stator for an electromotor, field coils associated with a packet of laminations are spaced apart by filler pieces. The combination of the field coils and filler pieces form an annular arrangement. Each filler piece extends between the adjacent ends of two field coils. The filler pieces are slotted in the radial direction to provide a certain adjustability in the circumferential direction of the annular arrangement where the dimension between the adjacent ends of the field coils is subject to variation.

Abstract: The polyphase stator winding of a dynamoelectric machine consists of a plurality of coils circumscribed about one another. Each coil has at least one end turn which includes two coil sides and a C-shaped connector ring that joins the coil sides together. The coil sides are straight conductors, or ones that are slightly bent on each end, and are embedded within the stator slots and extend into the end basket region of the machine where they are joined together by the C-shaped connector rings.

Abstract: Dynamoelectric machine stator assemblies with new and improved winding interconnection arrangements are disclosed. Windings are disposed in slots of a magnetic core with end turn portions thereof disposed adjacent a core face. The winding end turn portions are compressed and shaped to receive and support a connection insulator. A connection insulator comprising a plurality of holsters contains tap wire connection points and is located within a deformed section at the outer peripheral surface of the winding end turns. The connection insulator is retained in position by a retention means and secured to the winding end turns by lacing material.

Abstract: The invention relates to a stator (1), the coil ends (5+6) of which are supported by means of at least one pressure hose (12, 13, 14) arranged along the circumference of the stator, said pressure hose running zig-zag between radially outer (8) and radially inner (9) surfaces of the coil ends (5+6).

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: A mounting bracket for bracing C-shaped peripheral connecting ring segments situated in the stator end regions of a dynamoelectric machine stator structure. Mounting brackets are connected to both ends of the stator structure at desired circumferential positions. Each mounting bracket has a foundation structure which includes a base portion and a spacer retaining leg portion situated on each end thereof. A base spacer having several teeth separated slots is engageable with the base and retaining leg portions. The base spacer is secured in engagement by a bolt extending therethrough between retaining leg portions such that the slots face away from the base. L-shaped and T-shaped spacers are engageable in a cooperative configuration with the base spacer between the retaining leg portions such that the notches at the intersections of the legs of the T-shaped and L-shaped spacers cooperate with the base spacer's slots to provide channels for receiving and retaining the peripheral connector ring segments.

Abstract: The head connections on the lower end face of the stator winding of an electric machine are covered by trough-shaped insulating caps which have openings in their bottoms through which casting resin can be poured in, at the same time that caps are filled at the other end face. Succeeding insulating caps are turned 180.degree. relative to each other so that a long leakage path is obtained.

Abstract: Method of bracing winding end turns of an electric machine includes wrapping a first binding tape transversely around a pair of winding bars forming the end turns and disposed spaced from and substantially parallel to one another, wrapping a second binding tape transversely about the wrapped first binding tape in the space between the pair of winding bars so that the wrapped first and second binding tapes and the mutually opposing surfaces of the parallel winding bars define an inner space within, and injecting a flowable, cold hardenable cement mass into the inner space, and introducing into the space between the winding bars at the location of the inner space subsequently defined by the wrapped first and second binding tapes and the winding bars, and before injecting the cement mass into the inner space, a spacer member defining and predetermining the spacing between the pair of winding bars and having a shape that affords penetration of the cement mass from a given point of injection to all of the spaces a

Abstract: Forming the blower assemblies on a large squirrel cage induction motor of non-metallic steel reduces short circuiting ring temperature hot spots and temperature differentials experienced during motor startup.

Abstract: A method for the manufacture of a support construction for the coil ends in an electrical machine. According to the method, hollow objects substantially filled with a powdery filler agent and provided with porous walls are placed into the winding before its impregnation. The air spaces in said hollow objects are substantially filled in connection with the impregnation such that said objects, after hardening of the impregnation agent, constitute strong and rigid cast-plastics components.

Abstract: In a dynamoelectric machine having armature conductors located in the air-gap separating rotor and stator, the conductors are secured to the stator structure. Conductor fastening means are provided which maintain the armature conductors and their support members in compression in all modes of operation of the machine.

Abstract: A liquid cooled stator winding of a rotary electric machine comprising a stator bar which is composed of a plurality of hollow conductive elements and disposed within a slot of a stator core, and a liquid coolant header fixedly mounted on one end of the stator bar by heat welding. The stator bar is bent adjacent its end in a direction generally normal with respect to its longitudinal direction so as to serve trouble-free over long years of machine operation.

Abstract: Lead wires of a motor are stapled to a somewhat rigid, insulating disc to have their stripped ends be at selected points on the disc, the ends of the motor windings are placed in selected slots adjacent the stripped ends and wrapped thereabout and then soldered thereto to interconnect the winding ends with the appropriate lead wires, another insulating disc is positioned over the first and push nuts secure the assembly to the stator.

Abstract: A salient pole includes a flat coil made up of a multilayer winding of round wire. The wire includes an adhesive layer which is cured after winding to consolidate the winding. The winding is within a U-shaped channel which is impregnated with resin to fill any gaps. The flat coil fits over a pole core and is fixed thereto by means of spacers which axially space the coil from the pole core and radially space the coil from the machine casing.

Abstract: A dynamoelectric machine having a casing structure which includes a thin cylindrical member, circumferentially separated axial gussets attached to the cyclindrical member's interior, at least two axial rows of arcuate structural segments connected between the axial gussets, a cylindrical stator core, and a stator winding distributed on the stator core and having phase terminals. Conductor rings and ring extensions protruding therefrom are supported within the casing structure at one axial end thereof by conductor ring clamp systems and ring extension clamp structures respectively. Circumferential positions of the ring extensions correspond to the circumferential positions of the phase terminals. Phase leads which electrically connect the phase terminals and the ring extensions have standard lengths. the number of phase lead standard lengths equal the number of different radial distances the phase terminals are displaced from the stator core's axis.

Abstract: An air deflector mountable within an electric motor adjacent the outer periphery of a cooling fan within the motor and adjacent the stator winding end turns of the motor so as to inhibit circular flow of air within the motor and to ensure axial flow of air through the motor. In a first embodiment of the air deflector of this invention, the deflector is mounted on the stator through-bolts extending axially from the stator core of the motor, the through-bolts holding the end shields in place on the motor shell. In another embodiment of this invention, the deflectors are forceably inserted in the stator winding end turns and are held in place by the end turns and by the motor shell and are held captive between the stator core and a motor end shield.

Abstract: The disclosed arrangement for supporting stator end windings of an electric machine comprises a rigid inner ring and an outer ring, said rings being made of electrically insulating material. The inner ring is mounted coaxially with the inner bore of the stator core and supports the end portions of a stator bar winding, and the outer ring externally embraces these end portions. Both rings are mounted and secured together along the head portions of the end windings. The inner ring is attached to Z-shaped members arranged adjacent to the end portions and preventing the inner ring from axial displacement relative to the end portions. This is achieved due to the fact that a projection of each Z-shaped member, facing the end surface of the core, is positioned between winding bars at their outlet from core slots, said projection being rigidly connected with one of the brackets movably associated with a clamping plate of the core and attached to the outer ring.

Abstract: A stator bar winding of a slotless-core electrical machine comprises conductors enclosed in an insulating sheath with the conductors arranged in three concentric layers. Conductors of the inner layer are placed underneath every second conductor of the middle layer, whereas the conductors of the outer layer are placed over every other conductor of the middle layer. The conductors of the middle layer are bent in their overhang portions from the axial direction to the angle (90.degree.-.alpha..sub.1) which is twice as small as the angle 90.degree.-.alpha..sub.2) to which the overhang portions of two other layers are bent. The conductors of the middle layer are also electrically connected in series and alternately to respective conductors of the outer layer or inner layer.

Abstract: Means for holding the end turns of the stator windings of an electric motor or the like in place comprising a first unitary molded plastic member adapted to be placed on the inside of the windings and having a plurality of arms or web members spaced there-around which are adapted to extend at least in part over a portion of the inner surface of the windings, around the ends of the windings, and over a portion of the outer surface of the windings. A retainer ring is forceably installed over the outside of the web members so as to draw the web members into firm engagement with the windings and to positively hold the windings secure. A method of securing the windings is also disclosed.

Abstract: The present invention is a stator terminal construction for use in a rotary electrical machine such as an electric motor. The coil element of the stator coil is inserted in an iron core and a coil end of the coil element extends outwardly from a corresponding end of the core. This coil end has coil winding ends extending out of it and connected to lead wires for an external power source. The terminal structure is constituted by a block of moldable resin positioned directly on the coil end having the connections between the coil winding ends and the lead wires embedded therein. The terminal structure thus serves to insulate and fix the connections between the coil winding ends and the lead wires.

Abstract: There is disclosed a stator structure of an electric rotary machine with a stator winding composed of at least two phase coils wound on a stator core through respective slots formed in the core. In the stator, an elongated insulating strap layer is interleaved between two different phase coils at sites outside the slots such that the width of the strap layer extends in the longitudinal direction of the slots. A plurality of binding yarns pierce through the insulating strap at a distance from one of the opposite side edges which is farther than the other from the slots and bind the stator winding together with a portion of the strap layer lying between each of the pierced portions and said one side edge.

Abstract: A rotor construction and end turn supporting arrangement for restraining field winding end turns within circumferential slots formed in dynamoelectric machine rotors. Longitudinal slots axially disposed along the rotor intersect the circumferential slots and provide an open-faced housing for disposal therein of the field winding between the axially separated circumferential slots. Wedges are provided for insertion in at least some of the slots for retention therein of the field winding during high-speed rotor rotation. Utilizing electrically conductive wedges in both the longitudinal slots and circumferential slots establishes a rotor cage for carrying undesired eddy currents which are often induced in the rotor material.

Abstract: A stator structure for the induction motor is disclosed, in which the winding accommodated in the slots of the stator iron core has one end portion, outside of the stator iron core, shaped to provide a flared bell-like opening, and the other end portion thereof, outside of the stator iron core, forming short-passed winding and being provided with an opening sufficiently large to permit insertion of the shaft of the rotor. Between the inner surface of the short-passed end portion and a given portion of the surface of the stator iron core a coil-supporting member is disposed. The outer surface of the coil-supporting member has a shape along the inner surface of the other coil end portion, while the inside thereof is so shaped as to provide a sufficient space or air gap with respect to the rotor to be inserted.

Abstract: The invention relates to a connecting device for the stator winding of an electric machine such as an electric motor. The winding head is contained within a cover unit. The connecting device is installed within the cover unit and is used for joining the winding ends of the winding head with external heads. The connecting device has a head portion with grooves for receiving the winding ends and leads and a plug-in foot portion which is insertable into the grooves of the stator lamination packet.

Abstract: Improved cooling is provided for the end regions of the stator core of a large dynamoelectric machine. For this purpose, a solid rigid vent plate is placed in contact with the finger plate at each end of the core. The vent plates are non-magnetic plates of the same configuration as the core laminations and have radial grooves in at least one surface. Coolant gas flows through the grooves to directly cool the finger plate and the end laminations of the stator core.

Abstract: A dynamoelectric machine utilizing stiff, multiple component phase leads for connecting potentially misaligned stator coils and parallel phase rings. The phase leads, when attached to stator coil and phase ring coolant headers, provide electrical communication therebetween. The first and second phase lead components have a hole and cylindrical portion respectively wherein the cylindrical portion is insertable in the hole. Such phase lead hole has a longitudinal axis perpendicular to both slot elongation directions. Intimate electrical contact between the phase lead components and their connected coolant headers is insured by disposidng solder between their mateable, plane surfaces. Intimate electrical contact between the phase lead components is insured by brazing the components together at the interface between the assembled cylindrical portion and hole.

Abstract: The invention relates to an electric machine such as a motor having a stator lamination packet with winding heads at opposite ends thereof. A cover for each or either winding head has inner fingers which extend into the grooves of the stator packet and outer fingers with wedge shaped portions which extend between the inner fingers in the installed position. The wedge shaped portions are resiliently mounted relative to the cover proper. The wedge shaped portions have one set of edges engageable with an end face of the stator packet and a second set of relatively inclined edges engageable with the underside of the associated winding head. Circumferentially arranged grooves in the wedge shaped portions hold a ring which biases the outer fingers radially inwardly to bunch the winding head into a predetermined confined space.

Abstract: An air gap armature winding is provided for large generators. The armature winding preferably consists of conductors closely packed together in the air gap so that the maximum cross section of conductors can be used, and several radial layers of such conductors may be used. In order to permit forming the end portions of the winding conductors to the usual diamond or an equivalent) configuration, certain of the conductors lying at circumferentially spaced intervals are displaced radially in the end portions to make from for end turns to be formed. The displaced conductors are disposed so that the radial thickness of the end turn portions is not unduly increased.

Abstract: An insulating assembly for stator slots of electrical motors is provided comprising a pair of end plates of insulating material having a center opening for receiving a rotor and outwardly of said opening cutouts having the same shape as the stator slots of electrical motor, each of said cutouts having along the periphery thereof a flange extending from said end plate, intended to be inserted in a stator slot so as to form an insulating partition between the inner wall of the slots and the stator winding.

Abstract: The terminal portion of a winding end turn conductor which projects from the core member of a dynamoelectric machine is encapsulated in an epoxy potting compound by means of a casting assembly which comprises a detachable conformable pad, a plastic sleeve mold, and a portable vise. The conformable pad is fitted about the terminal portion of the conductor to provide a temporary barrier to axial flow of the epoxy compound during casting. The plastic sleeve is disposed around the terminal portion in a spaced relationship therewith and in an abutting relation with the pad to provide a barrier to the radial flow of the epoxy compound during casting. Clamping means such as a portable vise is fitted about the conformable pad and is tightened to establish a compressive union at the interface of the conformable pad and the terminal portion of the conductor to prevent leakage. A pair of spring members hold the sleeve in abutting engagement with the surface of the conformable pad during the casting process.

Abstract: The invention relates to an electric motor whose rear stator winding ends are embedded in a casting of electrically insulating plastic which is hard at the operating temperature of the motor, which is mounted with a stable metal flanged plate coaxial to the motor axis and fixed to a metallic outer casing member, wherein the flanged plate for the rear winding ends is perforated and is embedded in the casting up to its flange outer edge connected with the casing member at the axial height of the winding ends, surrounding the latter with an insulating clearance, the flanged plate serving too as a heat transfer means.A particular application of the invention is to built-in fans.

Abstract: A device for securing the end connectors of an electric machine stator winding, wherein the magnetic circuit stacks thereof are clamped axially by means of elements arranged on the end surfaces of the stator core, comprises two insulating conical rings, the end connectors of the winding being arranged between the conical surfaces of the rings. The outer conical ring is connected with the clamp board and is being adapted to move axially with respect to the clamp board. The inner conical ring is retained in an axial direction by means of axially arranged rods pivotally connected with the outer conical ring by means of supports. The suports are pivotally secured in the elements axially clamping the magnetic circuit stacks by means of radially arranged rods. The proposed structure provides for dependable securing of the end connectors of the winding, such that damage of insulation and loosening are avoided during the course of operation.

Abstract: Disclosed is a dynamoelectric machine with a tubular shaped stator assembly having a generally cylindroid rotor assembly mounted therein. There is a clearance between the outer circumference of the rotor and the inner circumference of the stator for the passage of cooling gas. On one end of the stator assembly there is mounted a dual position air gap baffle assembly. In one position the baffle assembly will regulate the flow of cooling gas in the clearance space between the dynamoelectric machine's stator and rotor; and in the other position, there is a keystone shaped opening which will make the rotor assembly accessible.

Abstract: A dynamoelectric machine having a stator portion with internally cooled windings disposed therein which are electrically and hydraulically connected to a system of conduits each of which conducts both electricity and coolant. The system of conduits provides electrical and coolant communication to the terminating portions of the windings and supplies coolant to intermediate end turn portions of the windings. Each conduit branches at one end into several members, one of which becomes a phase lead when electrically connected to a terminating portion of a winding while the remaining members conduct coolant in an electrically insulated manner to the winding's terminating and end turn portions.

Abstract: Apparatus for cooling lamination stacks of electric machines comprising an enclosure for receiving cooling gas, the enclosure being disposable around a lamination stack and being formed with a plurality of gas inlet chambers, means for circulating cooling gas through the chambers and through a plurality of axially spaced cooling channels formed in the lamination stack, and an additional gas inlet chamber located at an end of the lamination stack for receiving the cooling gas in parallel with the plurality of chambers and for directing the cooling gas over the end of the lamination stack.

Abstract: According to the invention, an electrical machine stator comprises a housing, a core, a winding mounted on the core, the upper and lower bars of said winding being connected in pairs in the end winding portion so as to form heads, a supporting member installed in said housing, which supporting member is constructed, in accordance with the invention, as a ring having a cylindrical projection whose height corresponds to the length of the end winding up to the heads, the stator being further provided with brackets whose supporting surfaces are arranged at an angle to the internal surface of the cylindrical projection, there being arranged wedges in the space between the internal surface of the cylindrical projection and the supporting surfaces of the brackets, which wedges are held in place by elastic members. The proposed stator is intended for high-power electrical machines, where it is necessary to ensure reliable fastening of the end winding in different operating conditions.

Abstract: A connector assembly for joining gas-cooled conductors of a dynamoelectric machine. Conductor compression in two mutually perpendicular directions is provided by a pair of plate members which are slideably engaged with a pair of wedge members. A compressive force applied to the plate members is transmitted directly to overlapping conductor end portions in a first direction, and a component of the compressive force is also transmitted to the conductors in a direction normal to the first direction by means of an inclined surface engaging arrangement between the wedge and plate member. The positive, controllable biaxial compression feature provides high mechanical strength and good electrical conductivity. Bolts for securing the plate and wedge members together are inserted from only one side of the connector, thereby providing easy assembly and clearance for induction soldering and ultrasonic inspection.

Abstract: An electric machine has a stack of stator plates forming a central throughgoing passage defining an axis and having an array of inwardly open and insulated axial grooves in the passage. A plurality of stator coils together form a tubular stator winding have a generally cylindrical central portion lying in the grooves, one end portion formed as a dome with a central aperture at the axis to one axial side of the stack, and another end portion of cylindrical slope to the other axial side of the stack. The domed end portion of the stator coil is secured together and physically stabilized by means of insulating lacquer and/or a domed insulating cage received within the domed end portion and mainly of smaller inside diameter than the outside diameter of a rotor within the stator coil.

Abstract: A motor stator having a salient pole magnetic core on which are wound coils of conductive wire incorporating an annular printed circuit board having a plurality of radially projecting terminals. The printed circuit board is secured directly to the projecting ends of the coils at one end of the core and the two wire ends of each coil are secured to pairs of adjacent terminals on the board. External electrical leads are then threaded through the core between the coils with one end of the respective leads electrically joined to terminals on the board.

Abstract: A tieless bracing arrangement is provided for rigidly supporting the winding end turns of a dynamoelectric machine in relatively rigid operating position. The bracing arrangement is characterized by including an expandable annulus having a spreader that is operable in conjunction with a plurality of slidably mounted dowels to selectively hold the annulus open while it is positioned adjacent to the machine end turns and then to compress the annulus tightly against the end turns to secure them in operating position.

Abstract: An electrical machine stator comprising a laminated iron core, with magnetic steel clamping plates installed on both ends of the core for clamping the core sheets by nonmagnetic steel clamping fingers rigidly attached to the clamping plates, with slots in said plates extending from top to bottom and used to accommodate the clamping fingers.

Abstract: A plurality of non-conductive rings are positioned around the outside surface which is defined by the end-winding conductors. A plurality of non-conductive flexure plates are secured to the rings and extend radially outward therefrom. The flexure plates are also secured to the generator frame by a coupling assembly which permits tangential movement and prevents axial and radial movement of the outermost flexure plate end. The plates flex in the axial direction to compensate for temperature responsive dimensional changes of the end-winding assembly.

Abstract: A plurality of conductors are surrounded by a continuous, flexible belt which is doubled over to provide loops at each end thereof. Non-metallic rods are disposed through the loops for providing surfaces to which a non-metallic buckle or strap is connected for securing the belt. The belt consists of a plurality of glass fiber cords which are surrounded by a cured elastomeric material. The cords are formed from glass fiber strands which are twisted sufficiently to provide the desired amount of belt strength and flexibility.