Abstract: An armature winding structure for use in an electric motor includes a web-shaped strand bundle composed of a plurality of parallel strands. The strand bundle has a plurality of longitudinally spaced bends and a plurality of straight strand bundle segments. Adjacent ones of the strand bundle segments are positioned one on each side of one of the bends. The strand bundle segments are transversely staggered on one side of the strand bundle successively from one end to the other of the strand bundle, by intervals each substantially equal to the width of the strand bundle. The strand bundle segments thus staggered are longitudinally folded over along fold lines extending respectively across or near the bends transversely of the strand bundle, thereby providing a plate-like winding in which the strand bundle segments lie adjacent to one another.

Abstract: A wall structure for insulating the exterior surface of a high voltage coil having Roebeled windings is provided that comprises an inner insulating layer formed from a hardenable epoxy material for surrounding the coil and filling void spaces on the surface of the coil created by the Roebeled windings, a ground wall layer surrounding the inner layer for grounding the wall structure, and a semiconductive layer formed from a carbon filled epoxy material integrally molded around the outer surface of the inner insulating layer for reducing the electric stress across the insulating layer and in particular across any voids remaining after the insulative layer has been applied over the Roebeled windings on the exterior of the coil. The improved wall structure advantageously increases the lifespan of high voltage coils by reducing the electric stress across the inner moulding layer, thereby reducing the probability that damaging electric arcing will ever occur in any void spaces present in this layer.

Abstract: A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.

Abstract: Disclosed is a bar or conductor constituted by a plurality of strands disposed in a slot and extending outward from the opposite ends of the slot with each of the strands being substantially bisymmetrically vertically slanted so as to be transposed in the vicinity of a longitudinally central portion of the slot-inside bar portion. Each of the strands being transposed such that the respective strand arrangements at the opposite ends of the slot-outside bar end portions are reversed with respect to each other, with the total number of transposed portions of all the strands is less than three times the number of the strands.

Abstract: The stator winding of a synchronous machine is made as a lap winding or as a wave winding and comprises a plurality of coils, each of which being composed of a top coil half (107) and a bottom coil half (105), the two coil halves, which are series-connected, to each other by means of a connecting device (106), being of identical shape.

Abstract: To simplify the fabrication and use of a transposed bar, the strip of insulating material for the strut projects higher than the conductor element stack and is incised along the longitudinal edges. Sections are formed, some of which (i.e., those immediately adjoining the offset location) are bent to be positioned below the offset points during the inserting of the strip. The non-incised surface of the strip serves as the strut of the transposed bar. The need for manual insertion of square- or diamond-shaped strips for additional insulation of the offset points is thereby eliminated. As the sections also contain a hardening resin, the internal corona shielding is improved.

Abstract: An apparatus for connecting conductor strands with transposition in an electrical rotary machine is disclosed to include a plurality of electrically conductive connector rods respectively connected to ends of the individual strands of each conductor, and a plurality of electrically conductive plates arrayed in the axial direction of the conductive connector rods and adapted to mutually connect respective pairs of strands of the multiple strand conductors through the corresponding conductive rods while electrically insulating one strand pair from other strand pairs.

Abstract: Disclosed is a winding for a high voltage electrical generator comprising a plurality of bundles of conducting member arranged whereby highest voltage is impressed on the innermost bundle and lowest voltage is impressed on the outmost bundles. The bundles of the winding are wrapped within sheets of electrical insulation with the cumulative insulation thickness being in approximate proportion to the voltage gradient across the bundles of the winding.

Abstract: This invention relates to an electrical cable useful in large power transformers and reactors. The cable is composed of a plurality of separate ropes which are generally of the same size and configuration which may be combined in accordance with a predetermined plan to form a complete cable.

Abstract: Conductor bar for electric machines operating at high voltage, including at least two subconductor packets being disposed side by side and being formed of mutually insulated subconductors, the subconductors being intertwined in such a manner that each subconductor occupies each possible physical position in at least one location within the conductor bar, an insulating sleeve, a semiconductor layer applied to the insulating sleeve, a further semiconductor layer disposed between the subconductor packets and the insulating sleeve, the conductor bar having a straight portion and narrow sides having a given width, a narrow-side subconductor bar crossing from one subconductor packet to another, the narrow-side subconductor bar being disposed at a given height filling a portion of the given width of the narrow side leaving a remaining width, hardenable cement layers being disposed substantially at the given height flanking the narrow-side conductor bar in vicinity of the crossing and filling the remaining width.

Abstract: A dynamoelectric machine having a generally cylindrical armature, the armature having a core including a plurality of slots in the circumferential edge thereof, in which a plurality of coils are wound in a plurality of poles and phases, the coils having a plurality of separate individual strands, wherein the strands of the coils are overlapped in a plurality of levels with each strand being transposed along the length of the coils in relation to the other strands such that they are transposed in the slot sections by an angle of substantially 360 degrees divided by the number of segments or strand groups over which the strands are to be transposed, and are reverse transposed at the end connecting portions by an angle of substantially 360 degrees divided by twice the number of segments or strand groups over which the strands are to be transposed, such that a total transposition substantially equal to 360 degrees will be achieved across all the segments or strand groups, whereby even in devices with short armatu

Abstract: A multiplanar conductor bar for electric machines comprising subconductors superimposed radially in a number n of circumferentially mutually adjacent planes, n being a whole, even number between six and ten, inclusive, and transposed by at least 360.degree.. A total of two groups of two adjacent subconductor planes, respectively, are formed at upper and lower sides of the multiplanar conductor bar by exclusively mutual crossover of the semiconductors of the two adjacent planes. A total of n/2-1 groups of four adjacent subconductor planes, respectively, are formed at the upper and lower sides of the multiplanar conductor bar by exclusively mutual crossover of the subconductors of the respective four adjacent subconductor planes and exclusively in a transition between the respective outer and the respective inner planes of the four planes. The respective groups of four adjacent planes are mutually offset at the lower side with respect to the upper side by two subconductor planes.

Abstract: A heat shrunken polymeric material is wrapped around a plurality of adhesive coated, insulated wire strands juxtaposed in a transposed configuration to compact the metal strands into intersurface contacting relation, and thus promote improved bonding together of the metal strands for enhanced short circuit withstand.

Abstract: A large electrical machine, includes bar windings composed of twisted individual conductors with irregularities formed at the narrow edges of the bar winding. The bar winding is composed of individual insulated conductors and uninsulated conductors. A synthetic mica-resin putty pressed between the conductors fills the spaces between the conductors. Electrically conductive strips covering the putty are electrically connected to the uninsulated conductors.

Abstract: A coil for a two or multi-layer winding of an electrical machine includes twisted subconductors in each coil side and an end portion connecting the subconductors of each coil side. The degree of twist in each coil side is less than a full turn of 360.degree.. If the subconductors in the end portion are parallel to one another, the direction of twist in each coil side is the same. If the subconductors in the end portion reverse their positions, the directions of twist in the two coil sides are opposite.

Abstract: The insulation requirements of a lattice bar for inhibiting glow discharges can be reduced by providing longitudinal notches in the bending portions of the flat spacing conductors in the lattice bar. The notches can be provided on one or both sides of the spacing conductors in dependence upon the degree of twist of the conductors in the lattice bar. The extent to which the notches extend across the spacing conductors can also be a function of the degree of twist.

Abstract: In a busway having plural busbars disposed with their broad sides in face-to-face relation, the ends of longitudinally aligned outside busbars are cut at complementary angles to create a single edge connecting segment for each busbar which extends through a phase transposition zone. Upper and lower transverse connectors are welded at their opposed ends to transversely aligned edge connecting segments to effectively reverse the phase positions of the busbars upstream and downstream of the transposition zone. If the busway includes two inside busbars, phase transposition is achieved in similar fashion. Once insulatively coated, the phase transpositioned busbars are nested together to create a compact transposition zone having a transverse dimension no greater than the busway therebeyond.

Abstract: A high efficiency conductor bar is provided for use in a high flux density environment. The bar is made up of a number of subconductors, each of which consists of strands of small size, insulated copper wire wound into twisted bundles and cables so as to be completely transposed. The subconductors and a tube for coolant fluid are then assembled into a conventionally transposed conductor bar.

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: A winding conductor is provided for large dynamoelectric machines, such as turbine generators, consisting of two parallel bars each comprising two stacks of strands transposed between the stacks. The radial flux in the machine causes circulating currents with unequal distribution of current between the two parallel bars of such a conductor, causing excessive heating in one of the bars. The two bars of each conductor are, therefore, made of different cross-sectional areas substantially proportional to the different currents, so that in normal operation, the current density is the same in both bars and overheating is prevented.

Abstract: A novel winding assembly of the gap winding type electric rotary machine is arranged on the inner periphery of the slotless magnetic core of the machine. The winding comprises a plurality of congregated twisted strands each including a plurality of insulated thin wires. The congregated strands are twisted in opposite directions in such a manner as to offset the effect of magnetic fluxes produced in adjacent twisted strands axially thereof, thereby reducing the reactance of the winding on the one hand and dampening the vibration and propulsive force which otherwise might be generated in the electric rotary machine.

Abstract: A composite tape insulation for use in winding onto electrical conductors to be further processed for installation in an electrical machine comprises an internal insulation structure having a layer of glass cloth or polyester fleece and a layer of fine mica impregnated with a cured synthetic resin such as an epoxide resin, and outer facing layers of a synthetic material such as a polycarbonate resin bonded to opposite sides of the internal insulation structure by the impregnating resin.

Abstract: In a transposed bar, the partial conductors of which traverse different height levels and are twisted by offsetting from one layer to the next, the partial conductors are disposed next to each other in four layers, and the twisting is carried out so that always two adjacent partial conductors are jointly offset.