Abstract: A parallel conducting ring structure for a dynamoelectric machine is configured to be mounted as a subassembly upon a conventional support cone for wholesale installation through an opening formed in an axial end of the casing structure surrounding the stator core of a dynamoelectric machine. Tab connections are attached, at preselected locations about the axis of the stator core, to the parallel conducting ring structure and are insulated with conventional groundwall insulation. Depending upon the particular direction of rotation of the rotor and upon the direction in which the generated electromotive forces are to peak, each direction of which is selected by the utility, the subassembly is installed within the casing structure through the opening, and adapted for such particular directions by stripping the insulation from selected ones of the tab connections, attaching the main leads exiting the casing structure to such tab connections, and leaving the remaining ones of the tab connections insulated.

Abstract: A biased securement system for end winding conductors of a turbine generator stator has a support ring and a biased wedge system that compresses the end windings in both a radial and circumferential direction. The biased wedge system includes a pair of spacer blocks with confronting angular surfaces and a triangular shaped wedge that is biased towards the support ring by use of a belleville spring washer.

Abstract: An improved stator end cap insulator assembly for a stator core wherein molded end cap insulator structure for the stator core includes end turn restraining structure having ventilation recesses for the end turns of the magnetic wire coils wound about the pole pieces and further includes structure for securing external lead wires cooperative with the restraining and ventilating structure.

Abstract: An electrically commutated, collectorless direct-current motor is disclosed whose stator has a self-supporting drum winding and a cylindrical plastic body which is located concentrically with the drum winding in a winding head. The cylindrical plastic body has recesses which contain eyehooks. The ends of the drum winding are connected with the eyehooks, which are welded to a circuit board. The invention makes it possible to automate the connection of the winding ends to the circuit board.

Abstract: An electrical generator connection, to connect coil ends, and a method of making the same. A header cap having a spherically shaped portion is brazed to each coil end to be connected. A pair of connector bars, each having a pair of similarly sized spherical seats, receives the spherical portion of each coil end header cap. Electrical and mechanical connection is provided by bolting the two connector bars together.

Abstract: An oil-filled, high temperature, submergible electric pump motor comprises an unvarnished stator structure having stator windings formed of conductors coated with hydrolytically stable, oil-resistant, and abrasion-resistant insulation exposed to the oil of the motor, and preferably selected from the group consisting PEEK, PEK, and PBI. The stator windings have end turns mounted on rigid, hydrolytically stable, oil-resistant electrically insulating blocks that support the weight of the stator windings and immobilize the end turns. The end turns are attached to the blocks by hydrolytically stable, oil-resistant electrically insulating tape. Other components of the insulation system are selected for their hydrolytic stability and oil resistance, and in some instances for their non-abrasive properties.

Abstract: Improved turbine generators including stator coil bracing and methods for bonding stator coils to diamond spacers to reduce the leakage of Corona suppressive compositions, such as CORONOX.RTM., are provided. The apparatus and methods include wrapping a portion of the stator coils coated with the Corona suppressive compositions with a reinforced layer which has been impregnated with a room-temperature polermerizing resin. The preferred constructions increase the bond strength between the coils and diamond spacers to provide a more homogeneous stator unit.

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: An electric machine that includes a stator having a sheet metal packet which has an end plate at each end, and insulating plates abutting against the end plates. The packet has radially inwardly opening winding grooves. Insulating plates are provided at the ends of the packet and have recesses that correspond to the grooves and ribs that form abutment faces against which winding liners provided in the grooves abut. The ribs are shaped such that the windings emerging from the grooves will not cut through the liners when bent sharply. The ends of the groove liners are shaped by thermal stamping to lie against the side faces of the ribs.

Abstract: A method for determining overheating in liquid-cooled windings of electric machines includes acoustically monitoring cooling liquid with at least one sound pickup, and detecting noises generated by bubbles in the event of local overheating if the boiling point of the cooling liquid is exceeded. An apparatus is also provided for carrying out the method.

Abstract: A filler material for supporting the coil end portions at the diamond area of a dynamoelectric machine consists of a resin filler disposed in the vent areas between adjacent coil end portions and a plurality of spacer blocks disposed in the filler. The spacer blocks have a sufficient volume and coefficient of thermal expansion to prevent excessive build up of temperature during curing of the resin and to decrease the overall coefficient of thermal expansion of the filler material and adjust the thermal expansion characteristics of the filler material so that such characteristics more closely match the thermal expansion characteristics of the coils themselves. The resin filler comprises an epoxy resin and the blocks, which have a generally orthogonal shape, are constructed of a laminated fiber glass material. A bead of resinous material is provided at the edges of the planar surfaces of the orthogonally shaped blocks to prevent abrasive contact between the blocks and the adjacent coil end portions.

Abstract: In an electrical generator, a connector for connecting stator coil sections and the method of making that connection, each coil section ending in a header cap of a predetermined geometry, and the connector being provided with openings of complementary geometry and spaced and aligned so as to receive the header caps. A recording tool is used for recording the spacing and alignment of a pair of header caps to be connected, the recorder being used in conjunction with a drill rig for drilling the openings in accordance with the recorded spacing and alignment information. The solid connector bar is placed over the header caps which are received within the drilled openings, and the bar is clamped onto the header caps with nuts.

Abstract: A coil support arrangement for use in connection with a dynamoelectric machine equipped with a stator having top and bottom winding coil end portions arranged in phase groups and extending outwardly from the stator at each end thereof. The support arrangement consists of a support ring encircling the bottom winding coil end portions, blocking means providing lateral support for the coil end portions to restrain vibrational movement of the latter during machine operation and a series of bands for holding the coil end portions of the phase group, the related blocking means and the support ring together, with the blocking means disposed in axial alignment with the ring to thereby present a single blocked and banded, elongated phase group structure which extends circumferentially around the inside of the ring. The blocking means consists of a plurality of individual block elements which extend the full radial depth of the phase group structure to provide deep beam strength characteristics to the structure.

Abstract: Inefficiencies in heat exchange between the end turns 20 of a dynamoelectric machine including a stator 10 and coolant carrying tubing 22 wrapped about the end turns 20 as a result of thermal growth of the end turns 20 may be avoided through the use of a retainer 28 for the tubing 22 and having a coefficient of thermal expansion that is substantially less than the coefficient of thermal expansion of the end turns 20.

Abstract: A mechanical clamping assembly and method for clamping coils at stator end windings of large steam turbine generators is provided for generators of the type which inhibit access to at least one side of coils to be clamped. The apparatus includes a precured radial band clamp having an anchor assembly which can be latched into position from radially inward of the generator. The method includes forming the precured band clamp in attachment to the anchor assembly, inserting the clamp and anchor assembly into position in the generator, inserting a pin into the clamp at its radially inward end, pulling on the pin to tension the clamp and inserting shims under the pin to maintain the tension.

Abstract: An apparatus for supporting conductor bars of an end winding of a stator winding of an electric machine having a lamination stack includes pressure plates holding the lamination stack together, support angles supporting the conductor bars in the vicinity of the end winding, a support ring being directly axially adjacent the pressure plate and having an inner periphery, the support angles having radially outer surfaces braced against the support ring, the support angles being guided and partially disposed in radially extending slots formed in the pressure plates, and spacers in the shape of ring segments resting on the inner periphery of the support ring and preventing tangential deflection of the support angles.

Abstract: Electrodeposited mica in a water soluble anionic resin binder, such as a modified polyester resin, is a means for applying a heavy coating of a high-voltage, mica-bearing electrical insulation onto uninsulated and insulated portions of electrical connections in dynamoelectric machines. The Electrodeposited mica coating is subsequently impregnated with a suitable resin, such as an epoxy or polyester resin, concurrently with the impregnation of other conventional insulations in the machine. Alternatively, deposition and impregnation of the connection insulation can be performed prior to installing the connection into the machine.

Abstract: A control device, such as a U-shaped member including opposingly directed tab projections connected to the upstanding arms of the member may be coupled to a space block of a dynamoelectric machine for limiting motion, especially inward radial motion, of the block. In one embodiment, the space block has a groove for forming a portion of a keyway between the space block and a flange and the tabs of the member are disposed in the keyway radially outward a key which is dimensionally smaller than the groove, so that the tabs abut a sidewall of the groove, thereby limiting motion of the block when the key contacts the tabs.

Abstract: An electric external rotor motor with a stator piled up of individual plates, in the grooves of which stator there are laid windings, and with an external rotor bell enclosing the stator on one side forming the rotor, the bearing elements of the rotor being accommodated inside face insulation shafts of the stator plate pack, and with a motor flange fastened to the side of the stator lying opposite the rotor, as well as with a motor connection cable connected inside the motor with the winding ends, in which the connection of the ends of the stator windings with the motor connection cable (12c) occurs by plug connections (8, 12) through the motor flange (18), for which contact lugs (8) are supported on a wall facing the motor flange (18), the wall being of the insulation disposed between stator plate pack (1) and stator winding.

Abstract: The laminated stator body of a large turbo-generator consists of a stack of laminations (1) comprising laminated compression plates (2), which stack is clamped together by means of tie plates (3) and tension bolts (8). The end face of the compression plate is stepped in the axial and radial direction. The tie plates have either a contour which matches the outside contour of the compression plate (2) or are smooth and, in the latter case, are supported by arch pressure in the radial direction. The elaborate machining of the compression plate end face, resulting in the elimination of lamination shorts, can thus be omitted without impairing the electrical and magnetic effects of the laminated compression plate on the end field of the machine.

Abstract: A spacer for fixedly positioning a winding with respect to the ends an associated core in an electromagnetic apparatus. The spacers are formed of a relatively stiff sheet material with high electrical insulating characteristics and are of a generally rectangular configuration bent to form a V-shaped spacer. The spacers contact ends of the cores and corresponding inner surfaces of their associated windings to hold them in a predetermined position and to define an insulator creep path. The spacers are described in conjunction with a dynamoelectric machine having a pole spaced from windings through use of the insulating spacers.

Abstract: Series loops of the stator of a large steam turbine-generator are electrically insulated from each other by enclosing each of them in its own clamshell thermoplastic resin mold and filling the mold with an electrically-insulating thermosetting resin material which bonds to the metal of the series loops and the stator bars and bonds also to the ground insulation covering on the stator bars and to the mold and together with the mold provides in cured form an integral body which is resistant to vibrational and impact forces and to distortional forces incident to thermal cycling of the equipment in normal use.

Abstract: A structure for consolidating large turbine generator end turns while providing for thermal compensation includes a decoupled brace that is located radially outside the end turns and has a bottom piece secured to a bracket secured to the core as well as a top piece adjacent the coil and an intermediate decoupler between the two that includes elastomeric material for cushioning as well as a slip layer for allowing free axial movement between the top and bottom pieces of the brace. Additionally, keyed strain blocks may be utilized between top and bottom coils of the assembly for greater consolidation.

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

Abstract: The present invention relates to an armature winding of a split stator having a slotted core divided by at least two circumferentially-spaced split lines to facilitate the disassembly and assembly of the split stator. The armature winding comprises armature coils in the slots of the stator core connected to provide poles and arranged to provide a plurality of armature coils divided at the split lines. Connecting and disconnecting means are provided to connect and disconnect the armature coils when the split stator is assembled and disassembled, respectively.

Abstract: This invention relates to an armature winding of a split stator for a rotary electric machine having a slotted core divided by at least two circumferentially-spaced split lines to facilitate the disassembly and assembly of the split stator. The armature coils crossing the split line of the split stator are divided to have heads at both ends of the stator core and provide half coils wound through the back unit of the stator frame such that these coils are mounted on both sides of the split line.

Abstract: A paper separator for insulating the stator winding end turns of a dynamoelectric machine at the point of their overlap. The paper is formed with a fold line and cut so that when the paper is properly folded and inserted between overlapping end turns, and a tie cord is tightened around the end turn bundle, the cord seats in a separator notch and bends a separator tab into engagement with one of the end turns to protect the winding insulation from damage due to contact with the cord.

Abstract: A dynamoelectric machine of the type having a cylindrical rotor including electrical conductors having radial portions and radially extending magnetic portions and including permanent and/or electromagnets to form axial end air gaps between the rotor and the stator, to provide interaction between the magnetic fields in the axial end air gaps and the electrical conductor radial portions and the radially extending magnetic portions to increase the magnetic inductance of the lateral or end stator fields and the armature or rotor.

Abstract: A mechanical clamping assembly and the method of its application for use on the stator end windings of large steam turbine generators is provided that can be fit in the mid-involute region of the end winding, including any existing machines as may be in use in the field as well as in original manufacture. The invention maintains pressure contact between coils and strain blocks and eliminates the freedom of the coils to vibrate relative to the total end basket assembly. The method comprises steps of forming a loop of impregnated banding material that extends through apertures of support blocks that span a pair of adjacent top and bottom coils, inserting pins in the ends of the loop, twisting a pin, curing the banding material, pulling on a pin to pretension the banding and shimming the pulled pin so that upon its release a tight assembly is provided.

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

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

Abstract: A resilient stator coil support bracket is provided particularly useful for large hydrogen innercooled turbine generators to give the end winding support assembly greater axial flexibility without substantially increasing the radial flexibility of the assembly. The support bracket includes an element secured to the core as well as an element secured to the brace that is radially outside each coil end turn with a sheet of resilient material therebetween, or there are two elements of the brace secured to the core with an intermediate element secured to the brace and the mating surfaces of all adjacent elements are spaced by sheets of resilient material, such as of an elastomer, that flexes in shear and compression modes. The bracket is tunable in the sense that the selection of the thickness and composition of the resilient material permits adjusting the natural frequency of the assembly to avoid resonance with the excitation frequency which such gas-cooled generators are sometimes susceptible.

Abstract: A rotary electric machine including a housing having a stator. The stator includes an armature winding with end turns extending from opposite ends thereof. A rotor is journalled within the housing and the stator and is separated from the stator by an air gap. At least two nozzles are located within the housing, one adjacent each end of the armature, and directed at an associated set of end turns. A pair of partitions are disposed within the housing, one for each end of the armature. Each partition is located axially outwardly of the associated end turns and nozzle. A first air gap seal includes a resilient gasket sealingly engaging a corresponding one of the partitions and the tips of the adjacent end turns while a second air gap seal includes sheet-like seals interposed between layers of the end turns.

Abstract: An insulation insert assembly has first and second substantially rectangular insulation sheets, and a pair of connection rods for connecting the sheets. The first and second sheets are arranged on the same plane directly opposing each other and have mutually facing parallel lateral edges at a prescribed distance. The second insulation sheet has a protrusion projecting from the lateral edge toward the first insulation sheet. The first and second insulation sheets are designed to be inserted between main and auxiliary coils, which are fitted to a stator core, to effect insulation between the coils. The connection rods are designed to be inserted into slots of the stator core. The protrusion is set between the rods and prevents a gap from being produced between the second insulation sheet and the stator core which might result from the lifting of the second sheet from the stator core.

Abstract: A hermetic motor-compressor has a motor cover or shroud overlying the end turns of the motor windings. The motor cover is secured to a fastening device in the form of a ring held in place by the stator fastening bolts. A molded plastic holder or retainer for a motor protector is fitted on a lug formed on the ring. The retainer is adapted to hold protectors of different physical configurations. The lug projects upwardly inside the cover and in one embodiment the retainer is trapped between and held in position by the ring and the cover. The protector is of the thermally responsive electrical cutout type and is maintained in closely overlying heat conductive relationship with respect to the end turns of the motor windings by the motor cover. The parts which hold the retainer and the protector in place are movable into their holding positions by the act of moving the cover down into position, in a direction generally parallel to the axis of the motor.

Abstract: A locking device on the end of a threaded fastener in an end winding support assembly is provided by a wrapped and tied cord on the stud end outside the nut with a coating of resinous material over the cord and a flat surface area on the stud to prevent turning of the assembled cord.

Abstract: The arrangement comprises a clamping plate (1) with a projecting portion (2), an insulating ring (3) tightly embracing the end windings (4), resilient strips (5) disposed on the outer surface of the insulating ring (3) and spaced around the periphery thereof, means (6) adapted for pressing the resilient strips (5) against the insulating ring (3) in a radial direction, interposed between the projecting portion (2) of the clamping plate (1) and the resilient strips (5), and being in contact with the projecting portion (2). Disposed in clearances between the resilient strips (5) are resilient members (9) which are in contact with the projecting portion (2) and the insulating ring (3) and provided with locking elements (12) adapted to prevent the resilient members (9) from axial displacement.

Abstract: A terminal tray which overlies the windings of a motor stator, has a plurality of lead guides. The guides are arranged to separate the leads from one another and retain them in their respective positions. The joins between the leads and the motor stator are within the tray. Further a lid arrangement and hinge tabs are provided for joining the lid to the tray. A plurality of spigots are extending from the tray into the stator and windings thereof for retaining the tray to the motor.

Abstract: A large turbine generator is provided with a stator end winding assembly that includes a large conical member outside the coils which is joined by banding with adjusting rings radially inside the coils, with an adjusting means for each banding location that includes a wedge extending through an aperture in a portion of the adjusting ring that extends away from the coil and having a fastener that is joined to the wedge so that upon the tightening of the fastener, the wedge will be forced in the axial direction bearing against the banding and hence tightening it; and in addition, the conical member is provided with projections serving as torque splines that fit within apertures of the core so as to prevent its rotational movement in operation.

Abstract: A field subassembly is assembled by positioning two coil supports adjacent respective core end faces of a ferromagnetic core. The core-engaging surfaces of the coil supports and the core end faces have respective surfaces which are uninterrupted by projections. During the assembly of the field, fasteners are pushed into the respective coil supports and the core such that the fasteners engage mounting holes in the coil support with a press-fit. After the field is wound, a brush holder subassembly is also pressed onto the fasteners and the resultant core subassembly is connected to a field housing by driving the fasteners in a conventional fashion. In the preferred embodiment, the fasteners provide a three-point contact with mounting holes formed in the coil supports and the brush holder subassembly.

Abstract: An insulated terminal connector which is designed to be frictionally mounted on the upper surface of a stator core prior to winding the field coils about the poles disposed inwardly of the core includes a retainer device and an alignment device.

Abstract: The present invention improves the construction of a cooling ventilation flue for the coil end portion of the stator of a rotary electric machine so as to enhance the cooling effect. That is, the invention provides a cooling device for a rotary electric machine characterized by comprising a ventilation guide which is disposed at the coil end portion of the stator of the rotary electric machine, which divides the stator coil end portion in an axial direction of the rotor of the rotary electric machine into a first ventilating section for advancing cooling air onto an inner peripheral side of the coil end portion and a second ventilating section for advancing the cooling air, having passed through the first ventilating section, onto an outer peripheral side of the coil end portion and which guides the cooling air, having passed through the second ventilating section, into a space surrounding the stator.

Abstract: A clamping mechanism for the end turns of a dynamoelectric machine is disclosed which permits periodic retightening and provides a means for compensating for misalignment of the clamping components. Annular spacers are provided, each of which have two nonparallel planar surfaces. When two of these spacers are combined in a coplanar association, they can be rotationally positioned relative to each other to provide spatial compensation between a nut and a clamping surface which is nonperpendicular to the threaded bar with which the nut is in threaded communication. The nut and spacers are fixed to the threaded bar with a covering of thermal setting tape to prevent relative movement and possible unthreading.

Abstract: A device for attachment of coil ends in a generator stator high-voltage winding includes insulation spacers (13) disposed on external surfaces of the coil end bars (16), auxiliary spacers disposed between coil end bars (16), a case (1), spring stops (15) anchored inside the case (1), and planks (14). The case (1) is made of two coaxial truncated-cone members (2 and 3) and a part of a torus member (4) made integral therewith and incorporating a joint (5) with a seal (6). Each plank (14) is arranged between two insulation spacers (13), and the insulation spacers (13) are arranged between the coil end bars (16) and the spring stops (15). The insulation spacers (13), the planks (14), the spring (15) and a side surface of the case (1) form cooling passages.

Abstract: A method and apparatus for securing end windings of turbine generators is described. The invention comprises a hose and a dry filament subcomposite disposed therein. By choosing suitable proportions of the subcomposite components, the coefficient of thermal expansion of the total hose assembly is preselectable with reasonable accuracy.

Abstract: The disclosed stepping motors have a toothed rotor surrounded by a stator having poles extending toward the rotor, and coils on the poles. At one end of the stator, serial connections between the coils are held at safe positions by detent portions of an annular insulator. Those connections are laid into the detents during the winding process.

Abstract: Disclosed is an electric-machine stator bar winding provided with an arrangement for electric insulation of end connections of extreme bars of different phase winding groups, that comprises box-type dielectric screens encompassing said connections. Each of the screens is built up of channel-shaped members made from a thermosetting material and having bent end portions. These members are so installed that adjacent walls of a pair of the screens in one interphase region of the end windings, lying in the radial planes of the stator are formed by adjoining walls of the angle-shaped members, the walls of the screens which are opposite to the adjoining walls are formed by the walls of the channel-shaped members, whereas the walls of the screens, lying in the tangential planes of the stator are formed by the flanges of the channel-shaped and angle-shaped members, the bent end portions of these members adjoining a part of involume sections of the bar end portions.

Abstract: An end turn support structure is disclosed which permits it to be constructed with varying, preselected coefficients of expansion along its length. This characteristic allows it to expand in a similar manner to the end turns which it supports. This structure also comprises conformable members and external support apparatus that provide a means for firmly attaching the end turns to the support structure and the support structure to the stator frame.

Abstract: An improved end winding support system for "P" bars is disclosed wherein each "P" bar extends axially from one end of a stator slot of the stator core of a dynamoelectric machine which has an integral excitation system. The support system includes means for affixing each of the "P" bars to stator bars at three different locations in the end winding region and especially in such a manner that the inner section close to the stator core includes a slip plane capable of accommodating relatively small differential thermal expansion displacements in the axial direction between the "P" bar and the stator bars.

Abstract: A rotor end turn winding and support system is disclosed which provides support in the radial, axial and circumferential directions for the end turns of a superconducting rotor field coil. The end turn conductor stack is tilted from a purely radial position to facilitate the winding of the small, flexible conductors of a superconducting rotor.