Abstract: A retaining ring system for a rotating electrical device such as a generator, motor, or condenser, including an auxiliary ring adapted to be removably mounted around the end portion of the rotor of the rotating electrical device bridging the rotor winding slots, and a retaining ring removably mounted around the first ring. The retaining ring supports the amortisseur and the field end windings of the rotating electrical device. An external first taper defined by the auxiliary ring and an internal second taper defined by the retaining ring provide mating, continuous first and second tapered surfaces. The assembly process is begun by sliding or jacking the auxiliary ring onto the rotor. A high pressure feed fluid line defined in the auxiliary ring includes an inlet port and an outlet port opening at a circumferential groove between the mating first and second tapered surfaces between O-ring seals.

Abstract: A stator coil of a generator for vehicles is provided with a stator coil construction and method for winding the stator coil around the core. The coil is wound around the stator core so that a portion of the stator coil projects from one or both sides of the stator core in the axial (longitudinal) direction of the core. The projecting portion of the stator coil closely surrounds the rotor core and is composed of inner and outer wire batches between which are formed slits which permit cooling air to pass therethrough and cool the coil more efficiently. The cooling air is generated by a fan which is attached to the rotor core facing the inner surface of the projecting portion of the stator coil.

Abstract: An end plate for a squirrel cage amortisseur winding is made from four angular segments, each of the segments being of the same shape and size, the segments having portions thereof cut out along the annular inner surface and the outer edges to accommodate close nesting of the angular segments across both the width and length of a sheet of raw material to minimize waste as they are cut therefrom.

Abstract: The end turn portions of the saddle-shaped coils of a superconducting field winding in the rotor of an electric machine are clamped in an axial direction by a wedge device positioned in an annular recess between its wall and the nearest end turn portion. The wedge device comprises two rings mounted coaxially with the recess and having their sides facing each other bevelled so that the distance therebetween increases toward the axis of the rings. These sides are provided with radial depressions. Bolts with heads tapering toward the threaded portions are positioned in the depressions. When the bolts are radially shifted the rings are forced apart thus pressing the end turn portions one to another and to the wall of the recess.

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: 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: An electric motor has a ferrous core extending along, rotatable about, and centered on an axis. This core is formed with axial slots and has opposite end edges centered on the axis. A winding extends along the slots of the core and has opposite axial ends extending axially beyond the core. A fan on the core circulates air axially over the core and winding. Respective deflector cages on the winding ends each include an inner ring, an outer ring fitted over the respective end edge of the core, and a plurality of ribs extending axially and radially between the rings and projecting generally axially from the respective winding end. The ribs are spaced apart on the respective winding end such that the winding end is exposed between the ribs. Thus on rotation of the rotor, particles blown by the fan are deflected by the ribs before they engage the winding ends.

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: A rotor structure for dynamoelectric machines includes a central shaft, defining a rotation axis, which supports main rotor windings. A winding support is disposed about and secured to the shaft and an encapsulated equalizer winding assembly is supported by said winding support. An expansion member is positioned between at least a portion of said encapsulated equalizer winding assembly and said winding support and an insulating resin covers at least exposed, proximate portions of said winding support, said expansion member and said encapsulated equalizer winding assembly.

Abstract: A dynamoelectric machine of the type having a distributed armature winding in a cylindrical rotor wound to form axial and substantially radial winding portions and including permanent and/or electromagnets to couple magnetic flux into the peripheral or circumferential surface of the rotor, and to provide interaction between a magnetic field formed beyond the rotor axial surfaces and the rotor to thereby enhance the total induction of flux into the rotor for improved, more efficient operation.

Abstract: In a machine such as a turbine generator with a rotor whose end turns are covered by a continuous retaining ring, axial blocks and support blocks are used in an end turn bracing system with the axial block supported by the support blocks at intermediate locations and with openings through the axial blocks at those locations that have a greater axial extent than the support blocks and permit axial gas flow that avoids obstruction by the support blocks. The support blocks are provided of laminated material whose laminations run continuously throughout both major and minor legs of their L-shaped cross-sectional configuration to avoid delamination due to stresses encountered in operation.

Abstract: A high speed shaftless rotor construction is disclosed including a method of sequentially building up the rotor to facilitate disassembly for reworking and maintaining precise alignment of the reassembled elements. End turn supports are matched and preliminarily assembled with bolts to the core and the parts machined to achieve desired tolerances. After machining, the end turn supports are separated from the core, matched with end shaft fittings and additional machining carried out, after which the turn supports are separated from the end shaft fittings and reattached with the core. The shaft fittings are realigned with the assembled end support fittings and bolted into position after which final machining can be completed. All elements are then disassembled and the parts deburred and cleaned to eliminate any contamination prior to winding the field coil.

Abstract: According to the invention, an insulator is provided at the axial ends of a rotor core. The insulator has radially spaced rows of notches at intervals approximately equal to the diameter of the winding wire for guiding placement of the turns of the winding at a predetermined location. After completion of the first turn, the wire is skewed at a first angle with respect to the plane of the first turn to coincide with the second notch and the remainder of turns in the first layer in turn completed in substantially parallel relationship. At the completion of the last turn of the first layer, the wire is crossed over the next to the last turn, skewing the winding in an opposite direction and situating the wire in the valleys formed between the successive turns in the first layer. The sequence continues alternately for the remaining layers.

Abstract: According to the invention, a rotor is provided having a cylindrical core and a protective can closely fit and secured with the core. The core is provided with two axially spaced, annular reliefs spaced inwardly from points of welding which secure the can and core and connected by at least two circumferentially spaced, axial reliefs. To effect removal of the can, a cutting tool is extended through the can along the extent of the reliefs. With the cuts completed, access sections are defined and are separable from the core. The remainder of the can, including the weld material, can be machined off using conventional techniques.

Abstract: According to the invention, an insulator is provided at the axial ends of a rotor core. The insulator has radially spaced rows of notches at intervals approximately equal to the diameter of the winding wire for guiding placement of the turns of the winding at a predetermined location. After completion of the first turn, the wire is skewed at a first angle with respect to the plane of the first turn to coincide with the second notch and the remainder of turns in the first layer in turn completed in substantially parallel relationship. At the completion of the last turn of the first layer, the wire is crossed over the next to the last turn, skewing the winding in an opposite direction and situating the wire in the valleys formed between the successive turns in the first layer. The sequence continues alternately for the remaining layers.

Abstract: A high speed shaftless rotor construction is disclosed including a method of sequentially building up the rotor to facilitate disassembly for reworking and maintaining precise alignment of the reassembled elements. End turn supports are matched and preliminarily assembled with bolts to the core and the parts machined to achieve desired tolerances. After machining, the end turn supports are separated from the core, matched with end shaft fittings and additional machining carried out, after which the turn supports are separated from the end shaft fittings and reattached with the core. The shaft fittings are realigned with the assembled end support fittings and bolted into position after which final machining can be completed. All elements are then disassembled and the parts deburred and cleaned to eliminate any contamination prior to winding the field coil.

Abstract: A main field coil for use in a dynamoelectric machine has a support having a predetermined geometry and a solid strand electrical wire with a circular cross section wound about the support. Coilhead (end turn) air vents of predetermined width are interspaced in the wound electrical wire. A structurally rigid removable pin has a grooved portion for receiving the wire and holding it as the air vents are formed, the pin being located at least partially in the air vents. The removable pin is removed from the air vents after the electrical wire is wound about the support.

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

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

Abstract: An electrical machine with a radial path air-cooled rotor is provided with an axial duct inlet fairing. The inlet fairing, in conjunction with the other elements of the structure, reduces the inlet pressure drop by a substantial factor and provides more effective cooling. In addition, the fairing provides a simple means of orificing the rotor axial ducts for thermally balancing the rotor slot conductors.

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 end turn region of a superconducting rotor is provided with end region support blocks that together provide channels for coil location. Within the support block channels there are intermittent supports in the form of insulating spacers extending radially both to the front and to the rear of the coil and also bottom spacers, with sheets of side insulation between the front and rear spacers and the adjacent support blocks. The intermittent supports provide access of coolant to the superconductor. They may also be formed in a manner to tilt the end region toward the pole piece for better mechanical support. A top insulating spacer is provided with cooling channels and is utilized with banding to provide secure compressive support for the end windings. Apertures in the support blocks and grooves in the spacers provide collant circulation.

Abstract: A tuning fork flexural quartz resonator is cut out from a Z plate rotated at 25.degree.-165.degree. around the X-axis as the rotary axis. The resonator with an excellent frequency sensitivity of about -100 ppm/.degree.C. is obtained when the cut angle .theta. is 120.degree..

Abstract: A novel armature of an electric rotating machine is disclosed. The armature core is divided axially into two or more members. The coils of the armature winding are fixed on the armature core in such a way that two or more coil sides are disposed in each slot of one member, and the coil sides disposed in the same slot are arranged in adjacent different slots of the other member. The end of each coil is positioned in a manner to substantially equalize the mutual inductance between each pair of adjacent coil ends.

Abstract: A method of winding and mounting superconductive coils on a cylindrical surface of the coil-carrying shaft of a rotor of a rotary electric machine. A superconductive wire is wound around the circumferential surface of a rectangular bobbin, thereby forming coils. The four straight portions of the circumferential surface are connected with each other by circularly curved surface portions. The portions of the circumferential surfaces corresponding to the axial direction of the coil-carrying shaft have a plurality of steps formed in the direction perpendicular to the axial direction of the coil-carrying shaft. A detachable side plate on the bobbin is then taken off, and the coil is removed from the bobbin.

Abstract: Described is a rotor of a superconductive rotary electric machine in which laminated coil protective covers composed of a plurality of thin-walled cylindrical plates are placed between both end parts of the superconducting field coils and coil holding rings that are mounted at both ends of a coil mounting shaft.

Abstract: The present invention consists in that insulating fillers on the sides of superconductive field coils disposed on a coil-carrying shaft in the rotor of a superconductive rotary electric machine are separated into padding plates mounted so as to cover all the sides of the superconductive field coils, and the other portions, thereby to prevent the damage of the insulation between the turns of the field coils and to firmly fix the field coils.

Abstract: A rotor of a superconductive rotary electric machine is disclosed in which fillers are inserted between the superconductive magnetic field coils and a plurality of padding plates which cover the entire side face of the superconductive field coils so that all the turns of the superconductive magnetic field coils are firmly secured. The rotor therefore can be stably operated.

Abstract: The rotor of a superconductive rotary electric machine has a coil-carrying shaft carrying superconductive field coils. A plurality of axially running parallel grooves and a pair of annular circumferentially running indentations, each of which is connected to one end of each of the grooves, are formed on the outer surface of the coil-carrying shaft. The axially and circumferentially running portions of the field coils are accommodated in the grooves and indentations respectively, and the spaces left by the circumferentially running portions of the field coils in the indentations are filled by electrically insulating fillers.

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 rotor core of an electric rotary machine is provided with a number of slots opening toward the outer peripheral surface of the core and teeth formed between the slots. At the sides of the rotor core are mounted spidery end plates having notches opposing the slots and projections opposing the teeth. That end surface of the projection which is remote from the rotor core is formed to extend farther from the end surface of the rotor core as it becomes distant from the axis of the rotor core. The rotor winding is wound about the rotor core and spidery end plates to be buried in the slots and notches, the bottom of the notch being higher than the laminate slot, so that the slot liner is not distorted during winding operations.

Abstract: A winding form made of readily removable material for use in positioning electric windings in predetermined spaced relationship on an electrical apparatus. A method for mounting a winding on an electrical apparatus using the winding form of the invention is also disclosed wherein the form is mounted in a preselected position on the apparatus, windings are wound around the form, then the form is removed from between the apparatus and the windings by either dissolving it in a suitable solvent or by melting it effectively to dissolve it.

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.

Abstract: Herein presented and claimed is a removable sleeve-to-shaft interlock for a dynamoelectric machine. The invention comprises: a shaft having a groove about its outer circumferential surface; a sleeve having a central bore for receiving said shaft therethrough, said sleeve having an eccentric groove about its inner circumferential surface; at least one detent, said detent being an arcuate spring having an associated radius smaller than the radius of the shaft and an asociated height greater than the depth of the shaft groove, said detent depressible during assembly and disassembly; and means for circumferentially positioning said detent in the shaft groove, for example at least one spacer having at least one protrusion which mates with a similarly shaped channel in the non-eccentric groove. After assembly the detent straddles the interface between the shaft and the sleeve, being within both of the grooves simultaneously, thereby preventing axial movement of the sleeve relative to the shaft.

Abstract: A locking structure for the rotor end winding of a distributed polar electric machine comprises a retaining ring embracing the rotor end winding and fixed on the rotor body by a shrink fit, and a locking ring preventing the retaining ring from axial shift with respect to the rotor body. The locking ring embraces both the retaining ring and the rotor body within their connection area and is secured firmly against radial shift with respect to both of them by the shrink fit. Said locking ring has bayonet joint portions on its inner surface at one of the end faces thereof, and has a bead at its other end face, serving as a thrust for a ring key. Mating portions of the bayonet joint are provided on the outer surface of the retaining ring, while the ring key is located on the rotor body.

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: A rotary electric machine comprises a rotor axially shorter than the lamination thickness of the stator core and having a coil retaining ring at each end of the coil thereof. The rotary electric machine further comprises a magnetic transmission device between each of the adjacent teeth of the stator core opposed to the coil retaining ring.

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: Surface currents are induced in dynamoelectric machine rotor body portions by negative sequence currents during unbalanced load operation. The surface currents are shunted away from retaining rings which are respectively situated on opposite axial ends of the rotor and function to restrain radial movement of conductor end turn portions which extend axially beyond the rotor's body portion. The retaining rings are shrink fitted on both ends of the rotor's body portion so as to structurally extend that body portion in both axial directions. Shunting the rotor surface currents away from the retaining rings provides an operating temperature therein of sufficiently low level to maintain high electrical joint integrity between the retaining ring and rotor. A mantle of highly conductive material surrounds both retaining rings in intimate electrical contact therewith. The mantle thickness is at least one-half depth of electrical current penetration for the rotor surface current's frequencies.

Abstract: A rotor component of an asynchronous electrical motor of the squirrel-cage type comprises a cylindrical array of circumferentially spaced short-circuited conductor bars having the opposite end portions thereof seated in corresponding circular grooves provided in the surfaces of annular conductive end rings. The ends of the conductor bars are soldered to adjoining surface portions of the grooves by placing solder in the gaps between the bar ends and groove surfaces and directly heating only the end rings so as to bring them up to the working temperature for effecting the soldering operation. The end rings are heated up circumferentially in a section-by-section manner so that soldering of the conductor bar ends to the end rings also takes place in a section-by-section manner.

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: An electric machine rotor end winding mounting shroud comprising a cylindrical shell having a thinned portion adjacent directly to the rotor body and provided with an inner annular recess at the edge region of the rotor body, whereby this cylindrical shell portion is made flexible, the cylindrical shell being cantilever-like arranged at the end portion of the rotor body.

Abstract: A rotor for use in a rotary electric machine, which rotor includes a rotary shaft, a core on the shaft, windings wound around the core and having axial end portions thereof protruded from the axial ends of the core respectively, retaining rings each fixedly mounted on the shaft and extending around the outer peripheral surface of each protruded end portion of the windings for preventing each protruded end portion from being radially outwardly moved during the rotation of the shaft, and shielding layers each positioned between the inner peripheral surface of each retaining ring and the outer peripheral surface of each protruded end portion of the windings for preventing the cooling gas from being in contact with the inner peripheral surface of each of the retaining rings.

Abstract: An armature for a pump motor, in which losses due to vorticity are substantially reduced, is disclosed. The armature includes a pair of symmetrical housing covers provided with axially extending webs. The webs overlap in nesting relationship and are provided with interlocking elements. Accordingly, the overall housing is streamlined without abrupt discontinuities which would otherwise contribute vorticity losses.

Abstract: A rotor end-winding support for a high-speed electrical machine such as a turbogenerator in the form of an end bell which surrounds the end-winding and comprises two concentric rings. The inner ring made, for example, from a high-strength antimagnetic steel is shrunk into the rotor body and secured against axial displacement. The outer ring, made, for example, from a carbon-fibre-reinforced material or a nonmagnetic e.g. titanium alloy having a high ratio of strength to specific weight, is either shrunk onto the inner ring or expanded hydraulically to permit a slipover fit. The division of the end bell structure into a number of concentrically arranged components makes it possible to use combinations of materials, the respective component rings being allotted functions which correspond to their particular properties.

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 rotor which utilizes winding guide discs to enable the slots of any rotor to be completely filled with wire without thereby increasing the diameter of the rotor by bulging out of the end windings. Winding guide discs having substantially the same cross section as the rotor are spaced a sufficient distance from the ends of the rotor to contain that portion of the end windings which will fill the space between the outside diameter of the rotor shaft and the minimum radial dimension of the slots in the rotor. After this space is filled, further end windings are wound from the rotor slots about corresponding apertures in the winding guide discs within the corresponding space on the disc. In the event that this corresponding space is filled further winding guide discs may be used as required to prevent the bulging of the end windings sought to be avoided.

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.