Abstract: A transformer comprising a core and winding wound around a winding axis extending along a limb of the core, said winding terminating in an axial end surface extending in a direction perpendicular to said winding axis, said transformer comprising a ring comprising magnetic material, said ring being located outside said winding and adjacent to said axial end surface. The ring comprises a set of magnetic metal components, such as magnetic metal sheets, said magnetic metal components being distributed about the winding axis and electrically insulated from each other. The core comprises a yoke, said yoke extending radially across the ring, at one or more crossing locations, from a radial inside of the ring to a radial outside of the ring. The cross-sectional height of the ring varies about the winding axis such that magnetic metal components at the crossing locations have lower height along the winding axis than magnetic metal components further away from the crossing locations.

Abstract: A dual coil inductor assembly includes an inner coil assembly including an inner coil and first and second terminals, and an outer coil assembly including an outer coil and third and fourth terminals. The inner coil includes an inner metal foil, and an inner electrical insulator sheet spirally co-wound with the inner metal foil. The outer coil includes an outer metal foil, and an outer electrical insulator sheet spirally co-wound with the outer metal foil. The inner coil is disposed within an outer coil air core of the outer coil so that the outer coil circumferentially surrounds the inner coil. The first and second terminals are electrically connected to the inner metal foil at respective first and second locations spaced apart along the inner metal foil. The third and fourth terminals are electrically connected to the outer metal foil at respective third and fourth locations spaced apart along the outer metal foil.

Abstract: A coil includes a first winding portion having a first wire helically wound including at least one strand, and a second winding portion having a second wire helically wound including a plurality of strands electrically connected to the first winding portion and has an axis that is parallel to an axial direction of the first winding portion, wherein the strands included in the second wire are arranged in parallel in an axial direction of the second winding portion, the number of strands included in the second wire is greater than the number of strands included in the first wire, the cross-sectional area of the second wire is equal to or larger than the cross-sectional area of the first wire, and the cross-sectional area of each strand included in the second wire is equal to or smaller than the cross-sectional area of each strand included in the first wire.

Abstract: A common mode noise filter of the present disclosure includes: a first insulating layer; a second insulating layer formed under the first insulating layer; a first coil including a first coil conductor and a second coil conductor, the first coil conductor being electrically connected to the second coil conductor; a second coil including a third coil conductor and a fourth coil conductor, the third coil conductor being electrically connected to the fourth coil conductor; and a third coil including a fifth coil conductor and a sixth coil conductor, the fifth coil conductor being electrically connected to the sixth coil conductor. Further, the first coil conductor, the third coil conductor, and the fifth coil conductor are sequentially formed on the first insulating layer from the outer side. The sixth coil conductor, the fourth coil conductor, and the second coil conductor are sequentially formed on second insulating layer from the outer side.

Abstract: A stationary induction electrical apparatus includes a disc winding having a structure in which a flow path for a cooling medium is provided between coils where a low voltage is generated between shield wires, an L-shaped insulation barrier is provided between coils where a high voltage is generated between the shield wires, a horizontal portion of the L-shaped insulation barrier is provided so as to closely contact an upper surface or a lower surface of the disc coil, a tip end portion in an axial direction of the L-shaped insulation barrier is provided so as to closely contact an inner surface of the disc coil which is adjacent to a pressboard insulation cylinder, and a height of the tip end portion in the axial direction is lower than a thickness of one coil.

Abstract: A high frequency transformer with high conversion efficiency is provided. The high frequency transformer includes a first coil assembly 1 formed from a single flat wire, with first coils 1A that are configured by winding the flat wire edgewise plural times and that are formed at specific intervals, and a second coil assembly 2 formed from a single flat wire, with second coils 2A that are configured by winding the flat wire edgewise plural times and that are formed at specific intervals.

Abstract: A pulse transformer includes a winding drum and a coil portion in which wires are wound around the winding core. The coil portion includes a first general winding area, a second general winding area, and a low density winding area. In the first general winding area, the wires are mutually closely wound around the winding core. In the second general winding area, the wires continuing from the wires of the first general winding area are mutually closely wound around the winding core. The low density winding area is formed along a winding axis of the winding core between the first general winding area and the second general winding area and has a low winding density of the wires along the winding axis.

Abstract: An assembly conducting wire for a rotary electric machine winding includes a plurality of bundled wires, the plurality of wires being twisted in a circumferential direction of the assembly conducting wire, and the plurality of wires being welded together at a predetermined distance.

Abstract: Various embodiments may provide a monolithic transformer for a radio frequency (RF) power amplifier module, such as a microwave frequency power amplifier module. The transformer may include a plurality of pairs of edge-coupled transmission lines, with individual pairs including first and second edge-coupled transmission lines. The first transmission lines may include first ends coupled with one another and second ends coupled with an input terminal of the transformer. The second transmission lines may include first ends coupled with the input terminal and second ends coupled with an output terminal of the transformer. The transformer may pass a communication signal from the input terminal to the output terminal, and provide a first impedance at the input terminal and a second impedance at the output terminal. The second impedance may be higher than the first impedance (e.g., by a factor of four).

Abstract: An electromagnetic induction device having an array of linearly arranged wires spanning between a pair of conductor plates forming a parallel circuit between each of the wires. The wires are arranged forming a plurality of planes, which are stacked into layers. Multiple induction devices are assembled together providing at least one “inductor” and at least one “inductee”. A moving magnetic field comprised of concentric circles is created in and around the at least one inductor when a cyclic current flows in the said wires. A voltage and current is induced by the said moving magnetic field. The field propagates then collapses through the wires of the inductees in a perpendicular manner, inducing therein a cyclic voltage and a current flow. The “inductor” and “inductee” can be shaped and assembled in a variety of form factors, including a linear arrangement, a toroidal arrangement, a stacked arrangement, and the like.

Abstract: An assembled circuit comprising a substrate, a coil, a first conductive segment, a second conductive segment, a first through-hole connector and a second through-hole connector is disclosed. The first conductive segment is electrically connected to one end of the first through-hole connector, the other end of the first through-hole connector is electrically connected to one end of the second through-hole connector via the first conductive segment, and the other end of the second through-hole connector is electrically connected to the second conductive segment.

Abstract: Low-cost, high performance woven conductors and associated inductive apparatus, and methods for manufacturing and utilizing the same. In one embodiment, an eight (8) conductor wiring strand is used that results in a pattern in which a given conductor resides, on average, at an equal position throughout the braid grouping as any other conductor within the wire strand over a given length. Such a configuration enhances coupling among the conductors, which minimizes deleterious parasitic effects such as leakage inductance and distributed capacitance. Segmented woven wiring strands are also disclosed which are composed of both woven and non-woven portions. Examples of devices which can utilize the woven conductors include, without limitation, bobbins or other formers, headers, encapsulated electronic packages, modular jacks, form-less inductive devices and transmission lines.

Abstract: The interleaved common mode transformer is a transformer particularly well suited for providing low voltage, high current dc outputs. Improving the efficiency of low voltage, high current transformer circuits requires a multi-faceted approach. Ac terminations and ac currents in connecting circuitry are particularly troublesome, so the input and output terminations of the transformer are dc. To utilize the winding fully, a common-mode push-pull configuration with common mode capacitors is used. Stray capacitance is less of a concern than leakage inductance at low voltages, so the windings are highly interleaved. Separate parallel secondary windings are used, an ac winding primarily for the ac currents, and a dc winding primarily for dc currents and heat sinking. The ac windings are thin; approximately two times the penetration depth. The dc windings are substantial, for low voltage drop and good heat sinking.

Abstract: A magnetic pole for magnetically levitation vehicles is described comprising a core and a winding applied on said core. According to the present invention, the winding has two spaced disks formed of conductor strip sections (21a, 21b) wound in opposite winding sense and in several layers around said core and conductively connected to each other at ends near said core by a connection section (21c) which defines the axial distance of said two disks (11, 12) and the winding sense of the two conductor strip sections (21a, 21b).

Abstract: The invention relates to a converter circuit with coupled inductances L1 and L2 which have a core K having an air gap S which is asymmetrical with respect to the inductances.

Abstract: A micro device includes a first magnetic layer, a second magnetic layer and a thin film coil. The first magnetic layer and the second magnetic layer are formed so as to be opposite to each other and magnetically connected via a joint. The thin film coil includes a planer round portion winding around the joint in between the first and the second magnetic layers and a perpendicular round portion provided perpendicularly to the planer round portion.

Abstract: To simplify coil production, in particular coils used for high-voltage transformers, a conductor is wound on to a winding form. The conductor comprises a plurality of conductor portions. The conductor portions overlap one another partially and are insulated from one another. A conductor and a winding arrangement can be produce with this method.

Abstract: The invention relates to a coil comprising a hollow former on which a plurality of same-length conductors are wound, together with connection means between the conductors and an electrical power supply for the coil, according to the invention the conductors are insulated, mutually parallel, and angularly offset, being wound together no said former so that each conductor forms spiral turns that are stacked on and interposed between the spiral turns of the other conductors, said conductors forming first and second windings about a common winding axis, one of the free ends of each conductor being accessible on the outer periphery of the first winding while the other free end of the conductor is accessible on the outer periphery of the second winding.

Abstract: To simplify coil production, in particular coils used for high-voltage transformers, a conductor is wound on to a winding form. The conductor comprises a plurality of conductor portions. The conductor portions overlap one another partially and are insulated from one another. A conductor and a winding arrangement can be produce with this method.

Abstract: The stator winding of an electrical machine comprises conductor elements which are spaced apart from one another, are electrically insulated from one another and are surrounded over their entire length by common main insulation. The cavities, which are caused by the arrangement on both bar narrow sides of the conductor elements and the main insulation, are filled with an electrically semiconductive compound which, for its part, is covered by an electrically semiconductive strip. In order to provide a smooth bar surface, the electrically semiconductive strip is composed of a fiber-reinforced plastic, which has incisions on alternate sides of the narrow sides of the conductor bar oriented transversely with respect to the bar's longitudinal direction; these incisions are deeper than half the strip width and have a cut width which is on the order of magnitude of the strip thickness.

Abstract: A superconducting transformer comprises a superconducting primary layer arranged to conduct an externally supplied primary electric current around a primary core to establish a magnetic flux through the primary core. The superconducting primary layer is formed on a primary substrate of electrically insulating, non-magnetic material. A superconducting secondary layer is arranged to conduct a secondary electric current around a secondary core. The superconducting secondary layer is formed on a secondary substrate of electrically insulating, non-magnetic material. The primary and secondary cores are made of a non-saturating material. The secondary electric current is generated by stacking the layers to couple the magnetic flux from the primary core to the secondary core. Superconducting vias are formed through the primary, isolation, and secondary layers for making external connections to the transformer.

Abstract: An integrated magnetic exploding foil initiator fire set includes a DC-DC converter with a first transformer, a triggering mechanism with a second transformer, and an integrated magnetic structure for the respective transformers. Inductive interference is minimized in the respective transformers by the construction and placement of the transformer windings. The use of planar magnetic core material and flexprint or printed circuit technologies for the windings reduces the cost and weight of the structure and provides a compact construction. Thus, the triggering mechanism provides higher energy and voltage output and eliminate the need for expensive spark-gap switches.

Abstract: An improved core-form transformer is disclosed. The core-form transformer includes a c-wrapped ribbon conductor with opposing wide sides and opposing thin sides. The c-wrapped ribbon conductor is wound around a core to form a plurality of coil sections. Adhesive is applied directly to one of the wide sides of the ribbon conductor to form a strong mechanical coupling within the coil sections. A novel transposing fold of the ribbon conductor is employed to create coil transpositions. The core-form transformer of the invention reduces circulating current losses while utilizing only a small number of transposing folds, generally adjacent to a first coil section, a last coil section, and an intermediate coil section.

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 cooling tube (T) is incorporated into each conductor (C1) of the coil. The current carried by this conductor is divided between the strands which are maintained in thermal contact with the tube even in transposition or twist areas in which the conductor undergoes particularly marked deformations. The conductor features at least one half-turn twist between the electrical terminals of the coil.

Abstract: In a stationary electromagnetic induction unit according to this invention, a plate-like coil is constituted by a plurality of coil elements wound in parallel. Therefore, a conductor width of the coil element becomes small, and a stray loss caused by a leakage flux vertically interlinked with the surface of the coil element, namely, the plate-like coil is reduced.

Abstract: A high-voltage winding for core-form power transformers is disclosed that uses two different conductor configurations within a single coil to minimize eddy current losses. The winding includes a first elongated conductor bundle formed from a plurality of thin enamel coated conductor ribbons arranged in side by side relation. A plurality of second elongated conductor bundles are each formed from at least one bundle section having a multiplicity of elongated insulated conductor strands arranged in side by side relation. Each of the conductor strands is less than 40 mils thick. The coil includes a top end section, a body section and a bottom end section. The body section is spirally wound with the first conductor bundle. The top and bottom end sections are wound with the second conductor bundles. In windings that include tap connectors, the tap section is also wound with one of the second conductor bundles.

Abstract: A high voltage electrical winding for shell form transformers is disclosed that reduces eddy current and circulating current losses within the winding. The winding is fabricated from an elongated conductor bundle that is spirally wound into a plurality of turns. The conductor bundle is formed from a multiplicity of enamel coated elongated conductor strands arranged in side by side relation. Each of the conductor strands has a rectangular cross section with a thickness of less than approximately 40 mils between contacting surfaces. The strand's cross sectional height is preferably less than 120 mils. The conductor strands are mounted side by side such that their respective contact surfaces abut. The conductor bundle is preferably wrapped in an adhesive tape to give the bundle some structural support and to provide insulation between winding turns. The disclosed winding also has very good mechanical strength and impulse distribution.

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: A winding for a static induction apparatus such as a transformer, a reactor and the like comprises a plurality of interleaved coils each formed by winding an electrically insulated strand conductor in a radial spiral. The coils are stacked axially and electrically connected in series between a line terminal and another terminal such as a neutral terminal. The winding is divided into a plurality of blocks each including a plurality of ones of the interleaved coils. The number of turns of each coil belonging to the block on the other terminal side is decreased as compared with that of each coil belonging to the block located closer to the line terminal, to thereby reduce the series electrostatic capacitance of the coils stepwise from one to another block starting from the one located on the line terminal side. The distribution constant is thus decreased. Favorable surge withstanding characteristics are attained, reliable insulation is assured and the winding can be realized in a reduced size.

Abstract: A winding for a static induction apparatus such as a transformer, a reactor and the like comprises a plurality of interleaved coils each formed by winding an electrically insulated strand conductor in a radial spiral. The coils are stacked axially and electrically connected in series between a line terminal and another terminal such as a neutral terminal. The winding is divided into a plurality of blocks each including a plurality of ones of the interleaved coils. The number of turns of each coil belonging to the block on the other terminal side is decreased as compared with that of each coil belonging to the block located closer to the line terminal, to thereby reduce the series electrostatic capacitance of the coils stepwise from one to another block starting from the one located on the line terminal side. The distribution constant is thus decreased. Favorable surge withstanding characteristics are attained, reliable insulation is assured and the winding can be realized in a reduced size.

Abstract: Disk coil winding formed of interwound single or double coils wherein insulation of outer turns opposite inner and outer generated surfaces, respectively, of the winding is reinforced in comparison with normal insulation of conductors of the winding including auxiliary insulations angularly surrounding at least one edge of at least two turns, respectively, in at least the coils disposed at an input of the winding, starting from the inner and the outer generated surface, turn capacitance between turns free of auxiliary insulation being increased with respect to turn capacitance at turns provided with the auxiliary insulations.

Abstract: A disc coil winding of interwound coils is formed of winding conductors covered with normal insulation, the winding having a radially inner and a radially outer surface. A plurality of the coils are disposed at an input to the winding, and have respective turns thereof located at the inner and the outer surface of the winding as well as respective turns thereof located radially adjacent thereto. Supplemental insulations are provided for reinforcing the normal insulation, the supplemental insulations extending from respective starting locations both between the turn located at the inner surface and the turn adjacent thereto as well as between the turn located at the outer surface and the turn adjacent thereto for protecting at least one edge of the respective turns. The coils have a turn capacitance between respective turns thereof free of the supplemental insulations which is greater than the turn capacitance between the respective turns thereof provided with the supplemental insulations.

Abstract: Conductor bundles for the concentric coils of a dry inductor having no iron core. The coils define cooling air gaps therebetween, adjacent ones of the coils being electrically connected in parallel and each coil being comprised of turns of a conductor bundle of the same rectangular cross section, the coils having different numbers of said turns. The conductor bundles form the turns of the coils and comprise a plurality of conductors electrically insulated from each other and twisted together, the conductor bundles of all coils are structurally identical with respect to the number and cross-sectional dimension of the conductors, and the rectangular cross sections of the conductor bundles forming respective coils have different cross-sectional dimensions in the axial direction of the respective coil whereby the coils have the same dimension in said axial direction while the number of the turns of the coils differs.

Abstract: A power transformer characterized by inner and outer low voltage winding sections and a high voltage winding section disposed therebetween. The low voltage windings are comprised of a plurality of pancake coils, and the high voltage winding are comprised of a plurality of conductor strands spirally wound for a plurality of coil layers. The low and high voltage winding sections are laterally spaced with the low voltage windings disposed in side-by-side positions and adjacent to the high voltage windings. The high voltage windings having a smaller turn height than the low voltage windings and having conductor strands of smaller gauge than the pancake coils of the low voltage windings.

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: The invention relates to an electrical winding for a transformer, a choke coil or the like, particularly for high frequencies, wherein the conductor forming the winding is radially subdivided into n subconductors and within the winding the subconductors are twisted in such a manner that the initially innermost subconductor, after twisting comes to lie outermost, the subconductor in the second innermost position, after twisting comes to lie at the second outermost position, etc. If the subconductors are designed as conductor tapes, the subconductors 1 through (n-1) comprise two partially overlapping tape sections which in the overlap region are conductively connected together at the side edges of the tape, the n.sup.th conductor tape being made of one piece and forming one of the outwardly disposed subconductors of the conductor.

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 disk wound transformer winding employing at least two external electrostatic shields extending axially along the outside of the disk winding for grading the impulse voltage within the winding. The inner external shield closest to the winding is connected to the line terminal and the outer external shield is connected to ground. A substantially linear voltage gradient under impulse conditions is attained by the combination of a disk winding arrangement and a specifically tailored assembly of external shields extending along the outside of the winding.

Abstract: Windings for electrical inductive apparatus are disclosed which include a plurality of first and second pairs of disc coil sections arranged in a stack. Each of the second pairs of disc coil sections are disposed between the first pairs of disc coil sections. Each of the disc coil sections includes two conductors wound in parallel with each other. Each of the two conductors at the inner ends of each section in the first pair of disc coil sections are connected to each of the two conductors at the inner ends of each section in the second pair of disc coil sections, respectively. One conductor at the outer ends of the two sections in the second pair of disc coil sections is connected to one conductor at the outer ends of the two sections in the first pair of disc coil sections. Each of the three conductors at the outer end of two sections in the second pair of disc coil sections is connected to one of three conductors at the outer end of two sections in the next first pair of disc coil sections, respectively.

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: An interleaved turn, high series capacitance winding for electrical inductive apparatus having four mutually interleaved, electrically conductive paths through a plurality of axially spaced pancake coils. The pancake coils have a like number of total conductor turns, with each electrically conductive path, in each pancake coil, having an average of N+1/2 conductor turns.

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 primary coil and N secondary coils of insulated electrically conductive wire are wound side-by-side about a ferrite core. Every T turns, the wire forming the secondary coils is wound over a separator strip forming an array of loops. A pair of spaced parallel conductors, for displacing the separator strip, are inserted in the array of loops and are soldered to the loops. The loop portion in the space between the conductors is removed. The assembly is covered with a layer of insulating material. The windings are repeated in a second or more layers over the first layer until the desired number of primary and secondary turns is formed.

Abstract: The present invention concerns an induction furnace. It is the object of the invention to increase the power of such furnaces while maintaining their weight or space requirements, or, to reduce their weight or space requirements for a given power, or further to design machines more powerful than those known at the present time. There exist at this time crucible induction furnaces designed for a capacity of approximately 30 t of cast iron. The invention permits the adaptation of such a furnace to melt not case iron, but steel and to increase the capacity of said furnace to a higher order of magnitude, for example 100 t or more. To enable the furnace to satisfy the requirements of steel making, the invention also provides for an increase in specific power, presently limited to approximately 300 kW/t.

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: An electrostatic shielding arrangement for improving the initial distribution of voltage which in turn reduces the insulation stresses on disc-wound coils resulting from the application of impulse or steep wave-front voltages to such coils. Floating electrostatic shields are placed near or internal of the innermost or the innermost and outermost turns only of a disc coil section. Shields are connected together in pairs, with no more than one shield connection being made between adjacent coil sections.