Abstract: To provide a core component for making it possible to enhance the space factor of a conductor wire in a storage section, a motor component including the core component, and a forming method of the motor component, the motor component includes a core component 10 shaped like a letter T in transverse cross section and a coil made of a conductor wire 200 wound on a tooth 11 of the core component 10. The core component 10 includes the tooth 11, an outer peripheral piece 12 placed on one end side of the tooth 11, and an inner peripheral piece 13 placed on an opposite end side of the tooth, and a space surrounded by the outer peripheral surface of the tooth 11, an opposed face 12a of the outer peripheral piece 12 to the inner peripheral piece, and an opposed face 13a of the inner peripheral piece 13 to the outer peripheral piece is a coil storage section 14.

Abstract: An interphase insulating sheet of rotating electric machine is disclosed The interphase insulating sheet includes a first insulating portion, a second insulating portion, and at least one bridge piece. The first insulating portion includes at least one first coupling aid integrally provided with the first insulating portion to extend from an opposing end of the first insulating portion facing the second insulating portion. The second insulating portion includes at least one second coupling aid integrally provided with the second insulating portion to extend from an opposing end of the second insulating portion facing the first insulating portion. A first end portion of the bridge piece is heated welded to the first coupling aid. A second end portion of the bridge piece is heated welded to the second coupling aid. The first coupling aid has a first positioning hole. The second coupling aid has a second positioning hole.

Abstract: A method of spacing a plurality of electrical conductors for carrying electrical current in an electrical machine may include positioning between the electrical conductors an uncured spacer body. The uncured spacer body may include a curable material, and an activatable heat generating material mixed with the curable material. The method may further include activating the activatable heat generating material to heat the curable material to form a cured spacer to thereby space the electrical conductors in the electrical machine.

Abstract: An interphase insulating sheet of a rotating electric machine is disclosed. The interphase insulating sheet includes a first insulating portion arranged between first coil ends of two different phases, a second insulating portion arranged between second coil ends of two different phases, and bridge pieces inserted in slots. The first insulating portion and the second insulating portion each includes an outer surface facing radially outward of the stator core and an inner surface facing radially inward of the stator core. The bridge pieces each include a first end portion that is heat welded to the first insulating portion and a second end portion that is heat welded to the second insulating portion. When the first end portion is heat welded to the inner surface of the first insulating portion, the region including the edge of the first end portion is heat welded to the first insulating portion.

Abstract: A coil insulator of an electrical rotating machine used as a main insulator for insulating a bundle of conductors formed of a plurality of insulated wires to form an armature coil provided in a slot of a rotor core or a stator core of an electrical rotating machine, wherein the coil insulator includes a mica layer including at least one of a peeled-off mica and a composite mica, a woven- or unwoven cloth including at least one of inorganic and organic materials, hexagonal crystal boron nitride particles having a graphitization index of 1.8 or more, and thermosetting polymer organic resin which integrally connects the mica layer and the hexagonal crystal boron nitride particles to each other, and the hexagonal crystal boron nitride particles is oriented in a longitudinal direction of the coil.

Abstract: A motor includes a cylindrical stator. The stator includes a stator core having teeth, which project inwardly in the radial direction, and coils, which are formed by winding a conductive wire onto each tooth with first and second insulators. The first insulator includes a support extending axially from an outer restriction wall. Each of first to third bus bars is supported by the support of the first insulator in a state in which a main portion is exposed. The main portions of the first to third bus bars are thus in contact with ambient air.

Abstract: An arrangement for cooling an electric motor's stator winding coil is described. One area of a conductor insulation is removed to expose the copper conductor. The conductor is wound into a coil with bared, exposed conductor areas facing inward. The vertical edges of a slot or recess in an iron stator are lined with electrically insulating paper. A thermally conductive electrically insulating, ceramic substrate is bonded to the floor or base of the slot. The coil is inserted within the slot over the ceramic substrate with the exposed conductor facing and contacting the ceramic substrate. The coil is bonded to the ceramic substrate by thermally conductive and electrically insulative epoxy that fills the voids between the two. Heat flows from the conductor, through the bared copper surface, into the ceramic and the iron core stator with little resistance. A ceramic strip can be used alone or with copper traces bonded to the ceramic or conductor bared surface.

Abstract: A slot wedge for a generator stator includes a wedge body having top and bottom surfaces and a pair of oppositely inclined side surfaces, wherein at least the oppositely inclined surfaces are covered with a woven aramid fabric. A related method includes the steps of: (a) providing a wedge shaped body having top and bottom surfaces connected by oppositely inclined side surfaces; and (b) covering at least the oppositely inclined side surfaces with a woven aramid fabric.

Abstract: A stator for an inner rotor type motor includes a stator core 1, insulating members 10 and winding wire 3, 4. The stator core 1 includes: four divisional core elements 6 each integrally formed by setting up one tooth 2 to one yoke portion 8; and four divisional yoke elements 7. A rotor opening 11 is formed on top portions of the teeth 2 by arranging the divisional core elements 6 so that the teeth 2 are radially disposed. Four slots 9 are formed by respectively arranging the divisional yoke elements 7 between the yoke portions 8 of the adjacent divisional core elements 6. The winding wire 3, 4 is wound on the teeth 2. An inner surface of each yoke portion 8 is substantially perpendicular to the central axis of the corresponding tooth 2 while the insulating member 10 is provided on side surfaces of each tooth 2.

Abstract: A system is provided for cooling a stator coil of a rotating machine. In one embodiment, and by way of example only, the system includes a stator core, a radial core opening, and a sleeve. The stator core has an axially extending slot formed therein, an outer circumferential surface, and an inner circumferential surface. The radial core opening extends from the stator core outer circumferential surface to the axially extending slot. The sleeve is disposed within the axial slot and configured to surround the stator coil. The sleeve has a cooling fluid supply port formed therein that is aligned with the radial core opening.

Abstract: A method of replacing slot armor and slot liners in radial slots of generator rotors comprising: (a) removing a winding from respective radial slots in the generator rotor; (b) removing existing slot armors and slot liners from each of the radial slots in the generator rotor; (c) installing a pair of L-shaped slot armor components in each radial slot, each L-shaped armor component constructed of a powder-coated metal; and (d) installing a winding in the radial slots, wherein the L-shaped slot armor components substantially fill any space between the winding and adjacent walls of the radial slots.

Abstract: A phase insulator for a stator of a motor insulates between stator coils. The stator has plural stator coils inserted in slots in a stator core. The phase insulator insulates stator coils from each other. The phase insulator includes insulating sheet portions and bridge portions. The insulating sheet portions are disposed at both end portions of the stator core for insulating between the coil ends of the stator coils. The insulating sheet portions are made of a first material. The bridge portions connect the insulating sheet portions. The bridge portions are inserted in the slots of the stator core. The bridge portions are made of a second material. The second material has higher elastic characteristics than the first material.

Abstract: The invention relates to an insulating mask arrangement for electrically insulating an electric winding from an iron core (13) of an electrical machine (20), at least one mask element (11, 12) being arranged on the iron core (13). The invention provides that the iron core (13), in its axial extension (15), is covered throughout in its winding-guiding grooves (24) by one or more mask elements (11, 12). The invention also relates to an armature and to an electrical machine.

Abstract: A stator includes split cores arranged in a cylindrical shape. Coils are wound continuously around teeth of split cores forming the same electrical phase via a bridge line. On the outer surface of the split core, openings are formed at the upper end face and the lower end face. Through these openings, a convex portion of a jig is inserted to an engagement groove, whereby the split core is supported by the jig. A bridge line of each coil is led out from the teeth side to the outer surface side through an outlet. The led-out bridge lines are placed in storage grooves in a mutually non-contact manner.

Abstract: An insulator covering the teeth (31) of an armature (3) in an inner-rotor motor is composed of a tooth insulator (321), outer-side insulator (322), upper-end insulator (323), and lower-end insulator (324). The tooth insulator (321) is composed of substantially annular top and bottom members that are assembled from above and below to the teeth (31).

Abstract: When a rotating electrical machine winding is inserted into a slot with a protective insulation intervening between them, a semiconductive insulating layer is lap-wound between an interlayer insulating layer of the rotating electrical machine winding and the protective insulation, the semiconductive insulating layer being formed by center-folding a continuous semiconductive sheet in the longitudinal direction. A thermal stress relaxation layer is provided inside the center-folded continuous semiconductive sheet so that thermal stress exerted in thickness direction of the insulating layers is absorbed.

Abstract: Stator designs have wide-mouth slots between adjacent poles. Wire coils with high slot fill conductivity are formed around the poles. In some designs, the wire coils are wave wound around the poles. Thick bar conductors can be used for making the wire coils. The wire coils may be inserted using nozzle dispensers or transferred from a pre-form mandrel. In other designs, the wire coils are pre-formed on transferable pockets that are then mounted on the poles. Optional pole extensions or shoes can be attached to the stator poles after the wire coils are formed around the poles.

Abstract: An insulator includes a main body portion for axially covering one side face of a core that includes a plurality of teeth portions extending in a radial direction, and a plurality of extending portions extending from the main body portion in an axis direction of the core and covering a plurality of slots respectively formed between the teeth portions adjacent to each other. An extending length of one of the extending portions from the main body portion is specified longer than other extending portions.

Abstract: The present invention provides an outer rotor type motor for a drum type washing machine to reduce material and weight for fabrication, simplify fabrication process, provide stable assembly of a stator to a fixing side, such as a tub or a bearing housing, prevent unwinding of stacked steel plates in assembling a helical core, and reduce stress on the steel plates of the core.

Abstract: The present invention provides a rotary electric machine, of which the occupied volume can be reduced and which allows a space in an electric apparatus equipped therewith to be utilized effectively. A slot insulator 15 is integrally formed with a holder mounting portion 25, a whole or major part of which is positioned on one of end faces of a yoke 11 of a stator core 7. A lead wire holder 27 includes a connection holding portion 27a for disposing a plurality of connections 30, in which lead-out wires of windings are connected with corresponding core wires 29a of lead wires 29, at a predetermined interval so that the connections do not contact with each other. The lead wire holder 27 is arranged so that the connection holding portion 27a is positioned over a part of the windings 9 and the holder mounting portion 25 when the lead wire holder is attached to the holder mounting portion 25.

Abstract: A stator for rotary electric machines is provided, in which a volume occupied by winding portions may be increased and a connecting wire may readily be engaged to prevent from coming off. A plurality of connecting wire engaging hooks 23, with which the connecting wire extending from the winding portion is engaged, are respectively disposed in the vicinity of border portions between a plurality of magnetic pole sections 11 and a yoke 9, corresponding to the magnetic pole sections 11. A mounting location of a connecter 29 on a circuit substrate 7 is determined so that all of ends of a plurality of terminal conductors of the connecter may be located between adjoining two of the connecting wire engaging hooks 23. With this arrangement, all of the ends 31a of the plurality of terminal conductors 31 may be disposed between adjoining two of a plurality of the winding portions 3, and be spaced from the winding portions 3.

Abstract: An electric motor (10) comprising a stator core (11) in which slots (12) are formed, and a coil (20) is inserted in the slots. The slots are filled with an insulating resin (3), and the surface of the coil is coated with a coating layer, such as a phenol type epoxy powdery coating material or a phenol type varnish material. This prevents the insulating layer of the coil from being corroded by a strong alkaline liquid. The coating layer may have a thickness nearly equal to the thickness of an insulating paper. Further, the coating layer may have a thickness nearly equal to, or larger than, the thickness of the insulating paper.

Abstract: The invention provides means of limiting maximum current conducted through windings of an electric machine having a rotor and a stator. By encouraging an appropriate leakage flux around a winding, a leak impedance can be achieved which may be used, according to the invention, to limit the maximum current in the winding as a matter of machine design.

Abstract: An insulation structure of rotary electrical machinery which electrically insulates teeth of a stator from a winding wound on the teeth includes: an insulator made from hard insulation material, disposed on both axial ends of the teeth, and having a side wall disposed along a side surface of the teeth crossing to a circumferential direction thereof, and a high-heat-conductive electrical-insulation resin sheet disposed along the side surface of the teeth and insulating the teeth from the winding, wherein an axial end portion of the high-heat-conductive electrical-insulation resin sheet is disposed between the side wall of the insulator and the side surface of the teeth and is stacked on the side wall in a prescribed axial extent.

Abstract: The present invention relates to an insulator to be disposed in an armature core having a plurality of radially-formed salient poles. The insulator comprises a winding aligning portion having an approximately V shape (forming an angle of 60 degrees) and getting narrower from an outer side to an inner side in a radial direction of the armature core approximately at the middle between the salient poles to position a winding disposed at a first layer which is a most inner side in the radial direction of the armature core approximately at a middle between the salient poles. By this structure, it is possible to align the windings on the second layer and beyond, thereby preventing a dig-in and the like of the windings and hence preventing faulty insulation between the windings.

Abstract: A stator of a motor according to the invention includes a stator core 1 annularly continued, a plurality of insulators each having a body part which is engaged with an outer peripheral surface of a tooth part of the stator core and a flange part which is projected at a distal end side of the tooth part, and a coil which is wound around the tooth part by way of the insulator. A first magnetic body is provided on a surface of the flange part of the insulator opposed to a rotor, in a state magnetically connected to the tooth part.

Abstract: The present invention provides an outer rotor type motor for a drum type washing machine to reduce material and weight for fabrication, simplify fabrication process, provide stable assembly of a stator to a fixing side, such as a tub or a bearing housing, prevent unwinding of stacked steel plates in assembling a helical core, and reduce stress on the steel plates of the core.

Abstract: A slot insulator is provided and includes: an annular part; and a plurality of insulated winding parts disposed a circumference of the annular part. Each of the insulated winding parts has an insulated winding holding part and an insertion groove for housing a winding part of a tooth in a stator yoke. The insertion groove opens in one direction along a center axis of the annular plate and opens at both ends of the insertion groove in a radial direction of the annular plate.

Abstract: The object of the invention is an arrangement for an alternating-current machine that can be connected to an inverter and includes windings located in grooves and insulated from the plate core of the machine. According to the invention, an electrically conductive shield is fitted between the windings and the plate core, comprising a number of parallel strips. The strips are separated from each other and insulated from the plate core. The strips essentially extend over the length of the groove and are earthed or connected to the plate core.

Abstract: The present invention facilitates keeping the slot cells 8 of a generator rotor from migrating during operation of the rotor. The present invention utilizes a slot cell catch 10 that hold slot cells 8, both U-shaped and L-shaped, in position within a rotor body slot 6. The catch 10 limits movement to a pre-determined amount, usually only a fraction of an inch.

Abstract: A method of insulating the proximal portions of the coil edges of the stator. The insulation sheet has a folding portion for folding one or more coils of the same phase and two insertion portions extending from the folding portion so that distal ends are positioned away from a centerline of the folding portion. One or more coils of the same phase are folded by the folding portion and the two inserting portions are inserted into the slot or slots from which the one or more coils project. The inserting portions are drawn from inside of the stator core so that the folding portion spreads to fold the proximal portions of the coils. The inserting portions are securely held between the wall of the slots and the coils to prevent the insulation sheet from displacement, inclination and slip off to securely insulate the coils of different phases.

Abstract: An insulator covering the teeth (31) of an armature (3) in an inner-rotor motor is composed of a tooth insulator (321), outer-side insulator (322), upper-end insulator (323), and lower-end insulator (324). The tooth insulator (321) is composed of substantially annular top and bottom members that are assembled from above and below to the teeth (31).

Abstract: A rotor for an electrical machine, including axial conductors for the rotor field windings inserted into axial slots in the rotor body and are secured against the forces which occur during operation by peripherally arranged means, wherein a single conductor is disposed in each slot. The conductor is preferably disposed upright in the axial slot.

Abstract: An electric motor has a field assembly, such as a stator, for a dynamoelectric machine has field coils that are wound to a net shape. Lead wires are brought out from the ends of each field coil. The field coils are insulated with insulating sleeves or insulating slot liners. The field coils are assembled with stator core pieces, such as pole pieces and return path pieces, into the stator. The stator core pieces are formed prior to being assembled with the field coils. In an aspect of the invention, the pole pieces and return path pieces are separately formed and then assembled together with the field coils, which have also been separately formed.

Abstract: In a rotating electrical machine a stator winding is formed of flexible cables inserted in an open stator in the stator core. The stator slots extend from a radially outermost yoke part of the stator core radially inwards towards the rotor, the stator slots being separated by teeth. The stator slots are shaped as double slots with shoulders arranged in the slot walls such that each cable in the winding is secured between the previous cable in the stator slot and, seen from the slot opening, the next shoulder situated outside that particular cable. In a method for manufacturing such a winding the first cable is inserted through the opening of the stator slot and pressed firmly into a cable slot arranged at the bottom of the stator slot and designed to retain the cable when it has been pressed in.

Abstract: An electric motor capable of ensuring insulation of proximal portions of coil edges of a stator projecting from end of a stator core, and a method of insulating the proximal portions of the coil edges of the stator. The insulation sheet has a folding portion for folding one or more coils of the same phase and two insertion portions extending from the folding portion so that distal ends are positioned away from a centerline of the folding portion. One or more coils of the same phase are folded by the folding portion and the two inserting portions are inserted into the slot or slots from which the one or more coils project. The inserting portions are drawn from inside of the stator core so that the folding portion spreads to fold the proximal portions of the coils. The inserting portions are securely held between the wall of the slots and the coils to prevent the insulation sheet from displacement, inclination and slip off to securely insulate the coils of different phases.

Abstract: An improved generator rotor (30) and a method of repairing an existing generator rotor (12) are disclosed. Methods consistent with the present invention provide techniques for repairing existing stress-damaged rotors (12) to remove stress-induced cracks (29), without requiring new retaining rings (16), to significantly extend the useful life of a generator without the cost and complexity of conventional repair techniques. Improved generator rotors (30) consistent with the present invention provide a tooth-top design that is more resistant to stress-induced cracking than conventional designs, resulting in new generators with longer useful lives.

Abstract: The invention provides means of limiting maximum current conducted through windings of an electric machine having a rotor and a stator. By encouraging an appropriate leakage flux around a winding, a leak impedance can be achieved which may be used, according to the invention, to limit the maximum current in the winding as a matter of machine design.

Abstract: Magnet wires wound in slots in a lamination stack of a dynamoelectric machine are encapsulated, in whole or in part, with plastic. The plastic may be thermally conductive and have features molded therein that enhance heat transfer. The plastic may stiffen the armature and increase its critical speed. Characteristics of the plastic, its geometry and its distribution may be varied to adjust spinning inertia and resonant frequency of the armature. The magnet wires may be compressed into the slots, by application of iso-static pressure or by the pressure of the plastic being molded around them. Larger magnet wire can then be used which increases the power of the electric motor using the armature having the larger magnet wire. A two or three plate mold may be used to mold the plastic around the armature. Balancing features can be molded in place. The plastic can have a base polymer that is a blend of two or more polymers and various thermally conductive fillings.

Abstract: A stator assembly for a dynamoelectric machine in accordance with the present invention includes a generally cylindrically-shaped stator core having a plurality of core slots formed along the inner surface thereof and defined by a radial depth and wherein a stator coil is disposed. The plurality of core slots defines a plurality of teeth therebetween, which have caps along the inner surface of the stator core and are connected to the stator core by a yoke portion. The plurality of core slots is lined along respective inner surfaces by a plurality of insulation slot liners. The teeth caps include projections along an inner diameter of the plurality of core slots. The slot openings are delimited by the projections along the stator inner diameter. These projections are substantially equal to a width of the slot liners, and are such that the delimited slot openings are substantially equal to a width of a conductor wire to be inserted into the lined core slots.

Abstract: A commutator motor includes a stator and a rotor, and the stator includes a stator yoke and a field magnet. The field magnet is fixed onto the inner peripheral surface of the substantially cylindrical stator yoke. The stator yoke is configured by coaxially stacking a plurality of plate-like annular bodies, and the annular bodies are fixedly connected to each other by caulking at a caulking portion disposed on the annular body. In manufacture, the length of the stator yoke in the axial direction can be arbitrarily changed with the thickness of the annular body in the axial direction as a minimum unit. In case of manufacturing various stator yokes that are different in the axial length, the necessity of replacing a manufacturing machine is eliminated, thereby providing a commutator motor having the stator yoke which is low in the manufacturing costs.

Abstract: A method for mounting a tube in a space having a shape corresponding to the shape of the tube. The tube is inserted into the space, pressurized with a hot pressure medium causing the tube to expand until the space is filled, then a cold pressure medium is substituted for the hot pressure medium while maintaining constant pressure causing the tube to solidify in its expanded shape. Also, a rotating electric machine having such a tube between windings of a high-voltage cable in a stator slot.

Abstract: A slot armor component for use in a rotor of a dynamo-electric machine comprises a plurality of profile co-extruded polymer layers. The composite cross-section of the profile co-extruded layers may include a first leg portion and a second leg portion disposed at an angle to the first leg portion. The plurality of co-extruded polymer layers may include a glass-filled polymer layer arranged between two unfilled polymer layers such as a glass-filled Ultem layer having a glass-fill concentration equal to or less than 30% arranged between two unfilled Ultem layers or a glass-filled polyetheretherketone (PEEK) layer having a glass-fill concentration equal to or less than 30% arranged between two unfilled PEEK layers.

Abstract: An insulating paper piece for electric motors, capable of improving both electrical insulation between a coil and a stator core and electrical insulation between ends of coils of different phases without adversely affecting ease of coil insertion or the space taken up for the coil. A single insulating paper piece for electric motors contains at least two slot cell portions arranged in two slots of the stator core in which portions of one single pole coil are to be inserted, with two phase insulation portions arranged to connect respective ends of the two slot cell portions to form loops and disposed to face directly against coil ends of the single pole coil. The phase insulation portions comprise overlapping widthwise portions extended from both ends so that when a plurality of the insulating paper pieces for electric motors are mounted on the stator core, the respective overlapping portions of the adjacent insulating paper pieces overlap one another.

Abstract: A dynamoelectrical machine (20) has winding bars (13) which are inserted into slots provided for this purpose in the dynamoelectrical machine (20), with the slots each being closed by cover wedges (23), and with corrugated springs (16) being provided between the cover wedges (23) and the winding bars (13) located underneath them, which are prestressed by means of opposing wedges (21), which are arranged between the cover wedges (23) and the winding bars (13) located underneath them. In a machine such as this, fast and simple wedging is made possible in that the opposing wedges (21) are arranged between the cover wedges (23) and the corrugated springs (16), and in that fixed-position adjusting elements (22) are provided, by means of which it is possible to vary the distance between the cover wedges (23) and the opposing wedges (21).

Abstract: The invention relates to a rotary electric machine including a stator, powered by a polyphase current, having a magnetic circuit with teeth forming intervening slots for receiving electrical conductors. The magnetic circuit is made up of an assembly of sectors defining air-gaps intersecting the teeth at half-width.

Abstract: A rotating electrical machine and method for making the machine, where the machine includes a high-voltage stator winding and elongated support devices for supporting the winding. The machine and method employ an arrangement of cable that is made of inner conductive strands, covered with a first semiconducting layer, which is covered with an insulating layer, which is covered with a second semiconducting layer. The cable is wound in slots in the stator such that separate cable lead-throughs are positioned in specific arrangements with respect to each other and in slots of the stator. The arrangement of the cable in the stator protects the integrity of the respective components in the cable and particularly the second semiconducting layer.

Abstract: A stator 3 of an on-vehicle AC generator 1 denoting a dynamo-electric machine has a stator core 32 having slots 35 arranged in a line along a circumferential direction of the stator core 32, electric conductors which are inserted into the slots 35 to be protruded from an end surface of the stator core 32 in an axial direction of the stator core 32 and of which portions protruded from an end surface of the stator core 32 in an axial direction of the stator core 32 are bent in the circumferential direction, and an electric insulating member 34 which is arranged between an inner wall of each slot 35 of the stator core 32 and a peripheral surface of the electric conductor so as to surround the electric conductor and has at least two duplicate layers 34A and 34B formed by duplicating the electric insulating member 34.

Abstract: An electric motor has a housing with a plurality of stator discs. The discs have slots that align with one another, forming passages. A dielectric film tube inserts into the slots, each of the tubes having a continuous circumference. Each tube has a nonmeltable dielectric film layer of high temperature insulation. The dielectric film layer has overlapping edges and is bonded to a carrier layer of a meltable material. The tubes may be inserted into the slot passages by drawing a vacuum in the interior of each tube, causing it to collapse so that it can be readily inserted.

Abstract: An improved generator rotor (30) and a method of repairing an existing generator rotor (12) are disclosed. Methods consistent with the present invention provide techniques for repairing existing stress-damaged rotors (12) to remove stress-induced cracks (29), without requiring new retaining rings (16), to significantly extend the useful life of a generator without the cost and complexity of conventional repair techniques. Improved generator rotors (30) consistent with the present invention provide a tooth-top design that is more resistant to stress-induced cracking than conventional designs, resulting in new generators with longer useful lives.