Abstract: The present invention is intended to provide a winding arrangement of single star connection for a rotating electrical machine, capable of enhancing insulation performance in coils of the same phase. In such winding arrangement, a first coil U1 to a sixth coil U6 are formed respectively in coil arranging parts 1U to 6U. Next, a coil arranging part 7U is skipped and the seventh coil U7 is formed in a coil arranging part 8U. Then, a coil formed at the end of winding (eighth coil U8) is formed in the skipped coil arranging part 7U.

Abstract: An electric motor stator has a stator core and a plurality of windings wound around teeth of the stator core. Each of the windings has two tooth winding portions with a crossover wire extending therebetween. Each of the windings starts from a neutral wire and winds around a first tooth to form a first tooth winding portion and then winds around an opposed tooth to form a second tooth winding portion with the crossover wire extending as a power wire. Thus the second tooth winding portion is started from the power wire. A terminal end of the second tooth winding portion is drawn out and connected to the neutral wire. The stator core has an insulator having support portions for preventing the tooth winding portions from falling outwards. The power wire is held between the tooth winding portion and a slot bottom so as to be fixed.

Abstract: A stator structure includes: a stator core (104) having a large number of concave slots (105) and a large number of convex magnetic poles (106) circumferentially alternately arranged; and magnet wires (101) of rectangular cross section in each of which an insulating coating (103) is formed on the outer surface of a metal wire (102), wherein each of the slots (105) is formed so that the distance (W2) between both the side surfaces (109, 109) of the slot (105) gradually decreases from the bottom (107) to a distal opening (108) of the slot (105), each of the magnet wires (101) is wound around the associated magnetic pole (106) and inserted in tiers in the associated slot (105), and the magnet wire (101) is placed in the slot (105) so that the width (W1) thereof continuously or stepwise decreases from the bottom (107) to the distal opening (108) of the slot (105).

Abstract: A winding former with a winding support between a first plate and a second plate for a saddle coil winding made up from a thin layer HTSC, which is destined for a cylindrical armature of an electrical machine, and which has two longitudinal legs parallel to the armature axis between two winding ends, wherein the winding support for each winding end has a bearing surface, which enables the thin layer HTSC to be wound to form a saddle coil without damaging the HTSC thin layer.

Abstract: A servo unit is arranged to operate an actuator, and a brushless motor is utilized in the servo unit. The brushless motor includes a rotational portion provided with a shaft and a rotor magnet rotating integrally with the shaft, a bearing portion rotatably supporting the shaft, a housing provided with a cylindrical portion retaining the bearing portion and a base portion bulging radially outwards from an axially lower portion of the cylindrical portion, a stator provided with a stator core having an inner peripheral surface to radially oppose an outer peripheral surface of the cylindrical portion of the housing and coils formed by conductive wires wound around the stator core, and a motor circuit board disposed on an axially upper side of the base portion. The base portion of the housing is arranged on an outer peripheral surface with a substantially arcuate concave portion which is concave in a radially inward direction.

Abstract: An electric motor includes an armature core, a commutator including a plurality of commutator segments, a neck disposed between the armature core and the commutator, and a plurality of wires each connected between two adjacent commutator segments and wound around the armature core via the neck. The wires include a first wire connected between first two adjacent commutator segments and a second wire connected between second two adjacent commutator segments positioned opposite to the first two adjacent commutator segments with respect to the axis of the armature core. The first wire and the second wire extend along the neck such that they do not contact with each other.

Abstract: Disclosed is a stator core for a generator and a motor comprising a frame formed in a shape of a straight plate; and a plurality of coil winding portions spacedly formed in one side of the frame and projected from the one side thereof. The stator core forms a stator by bending the frame in a round shape so as to position the coil winding portions in an inner side of the frame, laminating the frame, and winding coils around the coil winding portions. Wherein projections are spacedly formed in the portions corresponding to the coil winding portions in the other side of the frame, and the projections compensates height differences generated on an outer wheel of the frame due to a plastic deformation that portions corresponding to grooves between the coil winding portions in the other side of the frame are projected when bending the frame in a round shape, thereby to maintain evenly a surface of the outer wheel of the frame.

Abstract: A motor-generator includes a rotor that rotates about an axis of rotation, and a stator that is stationary and magnetically interacts with the rotor. The rotor is constructed of two spaced apart rotor portions having magnetic poles that drive magnetic flux across an armature airgap formed therebetween. An armature, located in the armature airgap, has a substantially nonmagnetic and low electrical conductivity form onto which wire windings are wound. The form has a free end that extends inside the rotor, and a support end that attaches to the stationary portion of the motor-generator. The form is constructed with a thin backing portion and thicker raised portions extending from the backing portion in the direction of the magnetic flux. The wire windings have multiple individually insulated conductor wire. The conductors of a single wire are electrically connected together in parallel and electrically insulated between each other along their length inside the armature airgap.

Abstract: The invention relates to a multipolar, linear or rotating synchronous direct drive motor which comprises a primary part and a secondary part. The primary part comprises a yoke and a plurality of teeth and slots interposed between said teeth, and winding strands of a polyphase winding running inside the slots. Between two winding strands of the same phase order the winding strands of the other phase or phases are disposed so as to overlap them. The secondary part is arranged opposite the primary part and comprises a plurality of permanent magnets of changing polarities on a common reflux base. The slot exits have an even slot pitch T<SB>N</SB> and the permanent magnetic poles have an even pole pitch T<SB>P</SB>. According to the invention, the winding strand of a respective phase winding consists of a continuous highly flexible braided wire, said braided wire being guided through the slots so as to meander around a group of teeth.

Abstract: A variable-speed rotating electric machine includes at least two armatures having respective armature coils for multiple phases, and a rotor having permanent magnets. The armatures are arranged concentrically with each other in such a manner that electrical angular positions of the individual armatures can be relatively varied in a circumferential direction. The armature coils of each phase are series-connected and the rotor is arranged concentrically with the armatures on the inside thereof.

Abstract: An armature winding includes a plurality of strand groups each having strands transposed and bound in at least two rows and multiple tiers, and a main insulator for covering the strand group. The strands belonging to a strand group on one side of a central strand group has a cross-sectional area smaller than that of the control strand group, and the strands belonging to the strand group on the other side of the central strand group has a cross-sectional area larger than that of the central strand group.

Abstract: A pair of stators produce a magnetic field within a space between them a ferromagnetic toroidal rotor is rotationally mounted within the magnetic field. A plurality of windings are wound radially on the rotor and each winding provides a plurality of coils. Each of coils is interconnected through a switch, the switch configured for placing each of the coils within each winding alternatively in one of an electrical series connection, an electrical parallel connection, and an electrically isolated connection, so that when operated as a generator, a selected output voltage and current are produced by rotor rotation and when operated as a motor a selected output speed and torque are produced.

Abstract: A method of fabricating an inductive coil having inner and outer winding portions formed from one or more metal sheets. The method includes wrapping a fiber strand around an outer surface of the inner winding portion, positioning the outer winding portion around the inner winding portion, and electrically coupling the inner winding portion to the outer winding portion to form an electric circuit.

Abstract: The invention relates to electric motors, particularly to low-voltage gearless commutator motors, and can be used as motor-wheels in transportation vehicles and in other technologies. The aim of the present invention is to provide an electric motor with increased performance characteristics, relatively simple design, and high reliability.

Abstract: An armature for an electromotive device having a unitary coil and armature is disclosed. The armature may include a coil having inner and outer wave winding portions separated by an insulator, each of the wave winding portions comprising a plurality of sheet metal conductors, and a commutator having a plurality of sheet metal commutator segments each being integrally formed with one of the conductors. The armature may be fabricated from a pair of conductive sheets by forming in each of the conductive sheets a plurality of conductive bands each having first and second conductor portions, shaping the conductive sheets into inner and outer cylinders, positioning the inner cylindrical conductive sheet inside the outer cylindrical conductive sheet, forming a coil from the first conductor portions of the inner and outer cylindrical conductive sheets, and forming a commutator from the second conductor portions of the inner and outer cylindrical conductive sheets.

Abstract: Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “line current” (called the “quality” or “Q” of the tank) is (1) greater than one, (2) large enough to allow the percent efficiency of the electric motor to be equal to or greater than 95%, and (3) removes enough back emf or enough of the influence thereof so that criteria (1) and (2) can be realized throughout the entire operating range of the motor. Only one PIPRC is needed for a DC motor. Recontrolling and/or redesigning is done for two reasons.

Abstract: A stator (1) includes a core member (10) having a central portion (12) with an even number of pole members (14–17) extending radially and outwardly from the central portion, a winding having a same even number of winding portions (20a–d) wound around the pole members respectively, and a drive circuit (50) having the winding connected thereto. A half of the winding portions is arranged in parallel with the other half of the winding portions. During working, the electric current passes the whole winding in alternate direction to establish alternate magnetic fields to drive a rotor of the motor to run.

Abstract: A rotating electric machine (1) has a rotor, a stator (2), and stator windings (3, 4). The windings (3, 4) include high voltage cable drawn through slots (5, 6) in the stator (2). Support members (8) are arranged inside the slots (5, 6) along and in contact with the windings (3, 4), said support members (8) comprising a hose (8?) with a substantially triangular cross-section. A wire (9) is extending through and being attached to each support member (8). When mounting the support members (8) air inside a support member (8) is evacuated in order to shrink the support member (8). Then the wire (9) extending through the support member (8) is used to pull the evacuated support member (8) into a slot (5, 6), whereupon the evacuated support member (8) is expanded by releasing the vacuum inside in order to make it clamp a cable inside a slot (5, 6) of the stator (2).

Abstract: An electric motor includes a stator which carries permanent magnets, and a rotor which carries electromagnets. A particular arrangement of connecting up the windings of the electromagnets to the distributing collector and the selection of the ratio of stator magnets to rotor electromagnets enable higher torque to be achieved. The main field of application is in motor-wheels of vehicles.

Abstract: A method and apparatus for a generator coil includes a plurality of stacked windings in a rotor where individual turns are stacked in parallel sided radial slots in the rotor. Each successive turn has the same width substantially corresponding to a constant width of each slot, wherein a first turn has a first thickness and a second turn has a second thickness thicker than said first thickness. The second turn is employed in regions of high temperature thereby reducing the temperature thereof.

Abstract: In a plant containing a turbo-generator the magnetic circuit of the turbo-generator is included in an electric generator which directly supplies a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the generator is built up of a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by outer and inner semiconducting layers (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The phases of the winding are Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter.

Abstract: A stator for use in a rotating machine includes a first conductor; and a second conductor wound, in-hand, over the first conductor and along a longitudinal axis of the stator. The second conductor is electrically isolated from the first conductor along the length of the first and second conductors. The multiple conductor in-hand winding construction allows multiple conductors to be combined to increase the overall current handling capability of the stator while substantially maintaining the “packing factor” (i.e., ratio of current-carrying conductor to overall conductor). The packing factor is substantially maintained because the amount of turn-to-turn insulation winding between typical conductors is very small.

Abstract: An armature for an actuator for applying vibration to a body along an axis, the armature having at least two parallel wound helical windings on the axis, and a terminal arrangement connected to the ends of the windings for selective connection of the windings to two external A.C. drivelines, the terminal arrangement being switchable between a relatively low impedance mode, with at least two of the windings connected electrically in parallel, and a relatively high impedance mode, with two of the windings or two groups of parallel-connected windings connected in series.

Abstract: The magnetic circuit of a generator in a hydro-generator plant is arranged to directly supply a high supply voltage of 20-800 kV, preferably higher than 36 kV. The generator is provided with solid insulation and its winding includes a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter. The invention also relates to a hydro-generator plant, a generator included in the plant and a procedure for building such a plant.

Abstract: In a rotary electric machine stator, a stator coil is formed of plural U-shaped conductor segments. Each of the conductor segments has a U-shaped turn portion disposed at one end of a stator core to form one of said coil ends, a pair of in-slot portion extending from the turn portion and inserted into slots and end portions extending from the in-slot portions to form the other coil end. One of the end portions of one of the U-shaped conductor segments extends straight in an axial direction, and the other bends in a circumferential direction by a predetermined angle to provide a wide cooling surface.

Abstract: A brushless motor with a rotor having a magnet and a magnetic return, the magnet and magnetic return being arranged to form a gap therebetween, and a stator having a coil disposed in the gap.

Abstract: An inductive coil for an electromotive device includes a pair of concentric conductive sheet metal winding portions each comprising a plurality of axially extending conductive bands each being separated from an adjacent conductive band by a space, each of the conductive bands of one of the winding portions being coupled to one of the conductive bands of the other winding portion, the winding portions being encapsulated in a material that extends through at least one of the spaces from an exterior portion of the induction coil to an interior portion of the induction coil.

Abstract: An armature includes a plurality of equalizing connectors for permanently electrically connecting pairs of commutator segments that should have the same electric potential, so that each of the pairs of the commutator segments that should have the same electric potential has a substantially equal electrical potential. In one embodiment, at least one pair of adjacent coil portions share a common slot.

Abstract: When one of armature coils is in a beginning of a commutation process, a center line of a trailing end tooth of a corresponding group of teeth, around which the one of the armature coils is wound, is generally aligned with a corresponding boundary between magnets. When the one of the armature coils is in an end of the commutation process, a center line of a leading end tooth of the corresponding group of the teeth is generally aligned with another boundary between the magnets.

Abstract: The magnetic circuit of synchronous compensator plant is included in an electric machine which is directly connected to a high supply voltage of 20-800 kV, preferably higher than 36 kV. The electric machine is provided with solid insulation and its winding(s) is/are built up of a cable (6) intended for high voltage comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The phases of the winding are Y-connected, and the Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point is earthed via a suppression filter. A procedure is used in the manufacture of a synchronous compensator for such plant, in which the cable used is threaded into the openings in the core for the magnetic circuit of the synchronous compensator.

Abstract: An electromagnetic device comprises a magnetic field generating electrical circuit including a winding (1) having at least one electrical conductor (2). The winding comprises a solid insulation (4) surrounded by outer and inner layers (3, 5) serving for equalization of potential and having semiconducting properties. Said at least one electrical conductor (2) is arranged interiorly of the inner semiconducting layer (3). The invention also relates to methods for electric field control and production of a magnetic circuit as well as use of a cable for obtaining a winding.

Abstract: One slot arranged between two slots containing a first armature winding contains a second armature winding for a phase different from a phase of the first armature winding; one slot arranged between the two slots containing the first armature winding contains a third armature winding for a phase equal to the phase of the second armature winding; and, one of the second armature winding and the third armature winding is arranged in a coil end portion in an outer peripheral side of the first armature winding, and the other is arranged in an inner peripheral side of the armature winding. With this, the projected height of the coil end portion of the stator can be reduced.

Abstract: The invention relates to a multipole commutator motor (14) having at least four stator poles (16-19) and having armature coils (31-42) that work together with these stator poles and that, for the supply of power, are each connected electrically with two commutator bars (1-12) of a commutator (22), and whose number is greater than the number of the stator poles (16-19), it being provided that, in order to reduce the number of brushes (20, 21; 23, 24) contacting the commutator (22), armature coils (31-42), that form armature poles having identical magnetic orientation are connected in parallel through electrical bridge conductors (43-48) at the armature. For the commutator motor (14), it is proposed that the bridge conductors (43-48) be routed at least partially via armature slots (71-82).

Abstract: A rotating electric machine for direct connection to all types of high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a rotor, stator and windings. The winding comprising a conductor surrounded by a solid insulation system. The invention also relates to a method for manufacturing the same.

Abstract: The invention relates to a rotating electric machine, especially an alternator or alternator/starter for motor vehicles, including a stator surrounding a rotor (10) equipped with a pack of metal plates, a gap between the stator and the rotor, permanent magnets integrated into the rotor and excitation coils (14) integrated into the rotor, in which the excitation coils are wound around salient poles (1310) cut out in the pack of metal plates of the rotor, and the permanent magnets are accommodated in housings (13110) formed in the pack of plates of the rotor and open towards the periphery of the rotor, characterized in that the housings (13110) are closed axially at each of their ends by a non-magnetic retaining piece (13) equipped with a part intended to come into abutment with the magnets, and in that the retaining piece features recesses for accommodations [sic] of the buns of the excitation coils (14).

Abstract: The apparatus for cooling a high power electrical transformer and electrical motors uses thermally conductive material interleaved between the turn layers of a high power transformer and iron core laminates to provide a low resistant thermal path to ambient. The strips direct excess heat from within the interior to protrusions outside of the windings (and core) where forced air or thermally conductive potting compound extracts the heat. This technique provides for a significant reduction of weight and volume along with a substantial increase in the power density while operating at a modest elevated temperature above ambient.

Abstract: Winding assemblies of electrical machines, such as electric motors, are provided which include a connector scheme having at least one conduit that is electrically coupled via a wave soldered connection directly to at least two windings which are not axially adjacent. The conduit can include a common connector and/or a phase connector. The connector scheme can additionally or alternatively include a power connector that is electrically coupled via wave soldering directly to a single winding, and adapted to be electrically coupled to a power source. The winding assemblies of the invention can additionally provide a number of constructions which allow for minimally sized air gaps.

Abstract: A method includes the steps of forming a substantially U-shaped insulator having outwardly bent portions formed by bending the side portions thereof at bent parts so as to be apart from each other, forming winding assemblies including strands of wire wound in a predetermined wound state, mounting the insulator in each slot in a manner such that the outwardly bent portions of the insulator protrude from an opening of the slot, and inserting the winding assemblies in each insulator from an open side of the slot by being guided by the outwardly bent portions and pushing the winding assemblies together with the insulator into each slot.

Abstract: The present invention provides a dynamo-electric machine that suppresses vibrations caused by imbalance due to electromagnetic forces and that also suppresses imbalance in magnetic attraction forces generated owing to the difference in the number of coil portions among electric circuit portions. This dynamo-electric machine comprises an armature having a winding consisting of a plurality of coil portions each formed by lap-winding a conductor between a corresponding pair of slots formed in an outer circumferential surface portion of a core fixed to a shaft in such a way as to extend in an axial direction thereof, a commutator fixed to an end portion of the shaft and having a plurality of segments to which both end sections of said coil portions are electrically connected, brushes made to respectively abut against the surfaces of the segments of the commutator, and equalizers for connecting said segments, which are to be at equal electric potential, to each other.

Abstract: In a stator winding bar for an electrical machine without end winding transposition and with transposition in the active part of 450°, the middle part of the active part, in order to compensate the external fields acting in the region of the end windings and inducing circulating currents, has a length that is greater than ¾ of the total length of the active part.

Abstract: An automatic data logging kit is used with a hydraulic integrity test kit for testing a liquid cooled stator bar system. The automatic data logging kit includes a spool piece having end connectors attachable between the liquid cooled stator bar system and the hydraulic integrity test kit as well as a plurality of sensor receptacles. At least one temperature sensor insertable within an interior of the liquid cooled stator bar system is coupled with an output connector operatively securable in the first of the sensor receptacles in the spool piece. At least one pressure sensor is also operatively securable in one of the spool piece sensor receptacles. A control unit receives output from the sensors and calculates a leak rate based on the received sensor output. The automatic data logging kit provides automatic data logging capabilities for pressure-decay and vacuum-decay cycle tests, increased accuracy of the pressure-decay and vacuum-decay data and reduced cycle time in determining the leak rates.

Abstract: An arc length—contacting with a commutator—of two brushes in a rotational direction of a motor is defined as not more than 5% of an outer rim length of the commutator, i.e., not more than &pgr;×/20, where A is an outside diameter of the commutator. A number of shorted segments of the commutator—the short is caused by the brush—is minimized, so that reduction in output of the motor can be prevented. As a result, the motor employed in a car product or an electric tool can be downsized and light-weighted.

Abstract: The system includes a permanent magnet three-phase motor and an electronic current controlled inverter by pulse width modulation. The motor has twenty-two poles and twenty-four slots, three phases and a cylindrical outer rotor. This structure minimizes torque ripple and maximizes energy efficiently. All coil windings are wound around the stator teeth. Several winding configurations are proposed and a special one with only one coil per slot. The motor phases are supplied by alternating rectangular current waveforms. A specific inverter control system is described to maximize efficiency and reduce current ripple and electromagnetic interference under motorizing or generating operations. The current control is realized by using the mosfets voltage for the current measurement.

Abstract: An armature for a rotating electrical machine and more particularly to an insulating cover for the pole teeth around which the windings are formed that has good strength against the winding without risk of damage of the insulator due to increased thickness in the highly stressed areas.

Abstract: A stator with a radial winding and a method for manufacturing such a stator provides a plurality of pole plates made of a magnetically conductive material. Each pole plate comprises a hub and at least two poles extending radially outward from the hub. The poles are spaced by an identical angular interval. Each pole has a distal end with a magnetic pole face. A metal wire is wound around the poles of the pole plates, thereby forming a pole plate assembly. At least two of the pole plate assemblies are assembled together with the poles of the pole plate assemblies disposed alternately.

Abstract: A high voltage stator bar 20 (FIG. 7) is used in a power generation system and includes a core section having a core 32 and stator coil 23, including at least one coil involute. A ground wall insulation layer 40 overlies and surrounds the stator coil. An inner grounding electrode 42 overlies and surrounds at least a portion of the ground wall insulation layer and includes the at least one coil involute. An insulator 46 overlies and surrounds the inner grounding electrode and leaves at least one exposed area 51 of the inner grounding electrode. An outer grounding electrode 52 overlies and surrounds the insulator and is electrically connected to the inner grounding electrode at the at least one exposed area of the inner grounding electrode for relieving a build-up of internal voltage, thereby preventing partial discharge.

Abstract: The invention relates to a rotor (1) for a turbogenerator having a field winding (4) which is formed from hollow conductors (3), having a damper bar (8), having insulation (9) arranged between the damper bar and the field winding, having a wedge (15) and having a gas outlet zone (5) which is located in the central rotor region. In order to reduce the distance between the field winding and the wedge, provision is made for the damper bar to be interrupted and to be replaced by an insulating piece (10) in the gas outlet zone (5), and for the damper bar parts (8) to be electrically conductively bridged by the wedge (15).

Abstract: A generator rotor includes a rotor body having defined pole regions with pole faces and parallel sides adjacent the pole faces. A winding module is fitted over the parallel sides of the rotor body, and a pair of spindles are secured to respective ends of the rotor body. The spindles secure opposite sides of the winding module to the rotor body. The spindles preferably include a notch that is shaped to receive one side, respectively, of the winding module. With this construction, flat windings can be used for the winding module, eliminating the need for a curved module to fit over the spindle.

Abstract: An adjustable strength permanent magnetic rotor for an alternator, comprising a pole piece assembly, and an adjustable magnetic ring assembly operably secured to the pole piece assembly. An adjustable ring retainer is operably secured to the adjustable magnetic ring assembly and a plurality of magnets are operably positioned adjacent to the pole piece assembly. A return path ring is secured and positioned adjacent to the plurality of magnets.

Abstract: An insulating material (10) for an electrical generator rotor and method of forming the same. An insulating substrate (12) is formed from a single layer of woven glass fabric (16) having a necessary thickness and coated with a thermosetting resin (18). A first side of the substrate (12) is adhered to a first layer of copper winding material (20) of an electrical generator. A second side of the substrate (12) is covered with a layer of contacting material (14), such as plastic film, paper, treated felt or coated glass fabric, to cover the rough as-formed surface of the substrate (12) resulting from the coating of the necessarily thick layer of fabric (16). The contacting material (14) provides a desired coefficient of friction to form a slip surface permitting relative movement between the first layer of copper winding material (20) and a second layer of copper winding material (24) disposed over the insulating material (10).