Abstract: A motor includes a rotor assembly and a stator. The rotor assembly includes a rotatable shaft extending in an axial direction, a rotor core coupled to the rotatable shaft and having a plurality of holes penetrating through the rotor core in the axial direction, a first end ring coupled to one end of the rotor core and configured to guide oil supplied to the rotor assembly into the plurality of holes, and a second end ring coupled to the opposite end of the rotor core and configured to guide oil passing through the plurality of holes in a radial direction.

Abstract: A generator rotor system having various features is disclosed. The generator rotor system has at least one main generator rotor with winding-pole sets spaced annularly about the rotor. The tendency of the rotor laminations of the poles to distort and or displace under the centrifugal force of the spinning rotor is ameliorated by a lamination clamping structure disposed axially outboard of the winding-pole sets.

Abstract: An electrical machine includes an armature defining a winding slot that houses a winding. A slot opening connects into the winding slot. A flux repeller is disposed in the slot opening to reduce slot leakage flux. In certain embodiments the armature is a stationary armature defining a plurality of winding slots, each winding slot housing a winding. A rotor is disposed radially apart from the stationary armature with a radial gap defined between the armature and rotor core. Each winding slot has a slot opening that connects the winding slot to the gap. A plurality of flux repellers is included as described above, with a respective one of the flux repellers disposed in each respective slot opening to reduce slot leakage flux.

Abstract: In an induction motor, when dimensions of respective elements of a rotor slot are defined as TB: a shortest distance between a center side of an inner circumferential slot and an outer circumference of the rotor; TC: a circumferential width of an innermost circumference of an outer circumferential slot; TD: a circumferential width of an outermost circumference of the inner circumference slot; and TE: a shortest distance between an end side of the inner circumferential slot and the outer circumference of the rotor, and when dimensions of respective elements of a stator iron core are defined as TF: a width of teeth; TG: a width of a teeth tip end; and TH: a width of a slot opening part, the dimensions of the respective elements of the rotor slot and the dimensions of the respective elements of the stator iron core satisfy the following relationships: TF/(TG+TH)×TD/2?TB?TD/2; and TF/(TG+TH)×TD/2?TE?TD/2.

Abstract: In one embodiment, a rotor for an induction motor comprises a punching assembly, a plurality of conductive bars, and an end-ring. The plurality of conductive bars may be substantially parallel to an axis of the rotor and connected to the punching assembly at a periphery of the punching assembly. Each conductive bar includes an end connected to the end-ring. The end-ring comprises a punching side having a surface facing the punching assembly and a housing side having a surface opposite the punching surface. The end-ring may be thicker on the punching side than the housing side. In this manner, the peak end ring stresses may be reduced at higher speeds and the mean time between failures of the rotor may be increased. Alternatively, the threshold speed may be increased and the top-speed of the off-highway vehicle may be increased for a given expected mean time between failures of the rotor.

Abstract: Winding start sections and winding end sections of winding wires are pulled out from slots of an armature core and are guided by wire guides of an insulator. Thereafter, each corresponding one of the winding start sections and the winding end sections is guided by a corresponding winding holding portion and is directly connected to a corresponding one of power supply terminal elements of a circuit apparatus without using an intermediate terminal.

Abstract: The invention pertains to the field of power generation and can be used in electromechanical energy conversion systems, in particular in asynchronous short-circuited machines. The essence of the proposed invention is that the action of a rotating electromagnetic field of a stator on the short-circuited turns of a rotor winding extending through areas adjacent to the pole pitch limits of the stator is supplemented by the additional action of a rotating electromagnetic field of the stator on sections of the short-circuited turns of the rotor winding extending through areas adjacent to the limits of a half pole pitch of the stator.

Abstract: A stator has four or more magnetic poles. A commutator has a plurality of segments arranged in the circumferential direction and a short-circuit conductor for short-circuiting predetermined segments from among these segments. Each segment has an angular width WS, and there is a gap of an angular width WU between the segments. A substantial angular width WB of each of an anode brush and a cathode brush satisfies (n?1)(WS+WU)+WU<WB<n(WS+WU)+WU, where n is an integer no less than two. A plurality of coils are each connected to the corresponding one of the segments in order to form n closed loops. The closed loops each pass through the corresponding segments and are electrically independent of each other.

Abstract: An armature winding of an electric rotating machine is provided, which includes at least one armature winding bar composed of a plurality of element wire conductors, wherein the armature winding bar includes an element wire conductor configured to have twisted transposing angles of 180 degrees at one border zone and a middle zone in a winding slot and a twisted transposing angle different from 180 degrees at the other border zone of the winding slot of the element wire conductor.

Abstract: Sub core sections are arranged at the end portions and the center portion of a stator core, and strand conductors are twisted and transposed by 360 degrees continuously toward the extending direction of winding slot. The length corresponding to transposition pitch 180 degrees of the strand conductors of the stator core is set as one core unit area, the sub core sections including portions whose space factors are different are arranged such that the sum of voltages in the strands induced in the strand conductors in the odd-numbered core unit area from one end portion of the stator core offsets the sum of voltages in the strands induced in the strand conductors in the even-numbered core unit area from the end portion of the core.

Abstract: A coil of a winding is wound around teeth of an armature core for a predetermined number of times in a motor. A start lead of the winding connects between the coil and a corresponding start segment among a plurality of segments of a commutator. A finish lead of the winding connects between the coil and a corresponding finish segment among the plurality of segments. The finish segment is located adjacent to a diametrically opposed one of the plurality of segments, which is circumferentially displaced by about 180 degrees from the start segment and is thereby diametrically opposed to the start segment.

Abstract: A modified armature winding for a stator of an electrical generator having a pigtail shape to promote cooling of the stator. At least one turn of the windings is extended outside the circumferential periphery of the stator, preferably forming a loop. An electrical short is created near the circumferential periphery of the stator between the winding segments to prevent current from flowing through the pigtail winding segment.

Abstract: An armature winding of an electric rotating machine is provided, which includes at least one armature winding bar composed of a plurality of element wire conductors, wherein the armature winding bar includes an element wire conductor configured to have twisted transposing angles of 180 degrees at one border zone and a middle zone in a winding slot and a twisted transposing angle different from 180 degrees at the other border zone of the winding slot of the element wire conductor.

Abstract: A stator has four or more magnetic poles. A commutator has a plurality of segments arranged in the circumferential direction and a short-circuit conductor for short-circuiting predetermined segments from among these segments. Each segment has an angular width WS, and there is a gap of an angular width WU between the segments. A substantial angular width WB of each of an anode brush and a cathode brush satisfies (n?1)(WS+WU)+WU<WB<n(WS+WU)+WU, where n is an integer no less than two. A plurality of coils are each connected to the corresponding one of the segments in order to form n closed loops. The closed loops each pass through the corresponding segments and are electrically independent of each other.

Abstract: An electric AC machine with a primary section and a secondary section is disclosed. The primary section has a region facing the secondary section and a region facing away from the secondary section. The region facing the secondary section has windings adapted to receive an AC current. The winding of the primary section has at least one phase conductor which at least partially extends in or on the region of the primary section facing away from the secondary section, thereby producing a magnetic field that extends outside the secondary section. This arrangement can reduce overvoltages and eliminate voltage breakdowns at the star point of winding strands of a synchronous motor.

Abstract: A motor has a plurality of excitation coils, a commutator having a plurality of segments, a plurality of supply brushes and a short-circuit line. Each coil is connected to corresponding ones of the segments. The supply brushes include a plurality of supply brushes each having one of an anode and a cathode. At least one supply brush has the other one of an anode and a cathode. The supply brushes each simultaneously contact different one of the segments. The short-circuit line short-circuits segments that simultaneously contact the supply brushes of the same pole. The supply brushes of the same pole separate from the short-circuited segments at different times.

Abstract: A power generator that operates at a reduced keybar voltages and currents, flange currents, and keybar voltage differentials includes a keybar shield that reduces the amount of magnetic flux coupling into a keybar of multiple keybars during operation of the generator. By reducing the amount of coupled flux, the keybar shield reduces a keybar voltage and a keybar current in a keybar, reduces keybar current flowing into a flange, and reduces a voltage differential between voltages induced by the flux in the multiple keybars.

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: A thermal control and keybar voltage differential reduction mechanism is provided for use in a power generator having multiple keybars that are each coupled to a flange. The mechanism includes an electrically conductive coupler capable of being electrically coupled to each of a first keybar and a second keybar of the multiple keybars. The coupler facilitates a flow of a current from the first keybar to the second keybar in response to a rotation of a rotor of the power generator, shunting the current away from the flange and producing a first magnetic field that opposes a second magnetic field induced by the rotation of the rotor.

Abstract: A dynamo-electric machine comprises: a shaft; a core secured to the shaft having slots formed therein extending in the axial direction; a winding composed of a wire or wires wound by a lap winding method through the slots; a commutator having commutator segments being disposed at one end of the core and secured to the shaft; and equalizing connectors electrically connecting commutator segments which should have the same electric potential; wherein one end portion of each of the equalizing connectors is connected to one of the commutator segments and the other end portion of each of the equalizing connectors passes through the slots and is connected to the other of the commutator segments.

Abstract: A stator of an electric motor with four poles which are all parallel to each other and arranged in mutually opposite pairs around the rotor cavity. Each pole has a pole shoe which is inclined toward the inside of the stator so as to form, in practice, the rotor cavity. The mutually closer ends of the four pole shoes are mutually rigidly coupled by two thin bridges which are parallel to the axes of the poles and by two similar thin bridges arranged transversely to the axes of the poles. The poles of each pairs of parallel poles are also mutually rigidly coupled by transverse cores which can be inserted in them and removed from them, so as to allow the insertion of the bobbins of the winding coils on the cores before the cores are fitted on the respective poles.

Abstract: An electric machine, such as a motor or a generator, comprises a stator having a plurality of stator poles defining a plurality of slots, a rotor positioned within the stator, and at least a two sets of stator windings wound on the stator poles and occupying said stator slots such that the boundary windings of each set of stator windings occupies a common slot. These boundary windings of each set of stator windings are non-overlapping and include insulation positioned between them. The sets of stator windings are wound on the stator poles in a single pitch winding configuration significantly reducing the number of wire crossings resulting. In particular, the endturns defined by the individual phase coils are non-intersecting. Such a machine provides continued operation under various fault conditions.

Abstract: An inductive element in the form of a shorting turn is added to the rotor of a permanent magnet synchronous motor. Changes in inductive coupling between the rotor and a stationary coil as the rotor rotates permits inductive measurements to be used to deduce rotor position information such as position velocity and acceleration.

Abstract: A switched reluctance electric motor is disclosed that includes a stator portion having a plurality of stator poles. Adjacent stator poles are wound with energizing windings and which are connected in-series to form a respective one of a plurality of motor phases of the electric motor. A rotor portion of the electric motor is also disclosed, and is supported for rotation relative to the stator, and which also includes a plurality of rotor poles. An electrical conductor having first and second ends is disposed about the adjacent stator poles for each one of the plurality of motor phases. The first and second ends of each electrical conductor are shorted together to thereby minimize induced flux linkages in non-energized motor phases when one of the motor phases is energized.

Abstract: A polyphase electric motor includes a stator having a field winding and a field backiron, and a rotor disposed within the stator including a permanent magnet with a plurality of pole pairs, wherein the field winding includes a plurality of coil segments, each coil segment having a plurality of electrically conductive turns of a polygonal shape, the turns in each coil segment having circumferentially opposite sides, the circumferentially opposite sides of relatively adjacent turns being circumferentially offset with respect to one another in the same circumferential direction so that each coil segment occupies a length generally equal to the arcuate length of two pole faces, each coil segment further including a subsegment of turns electrically commutated in accordance with a different one of a plurality of field phases.

Abstract: For a squirrel-cage rotor of an electric machine, having a cage that passes through the stack axially and is made of electrically well-conductive short-circuit rods that are connected by short-circuit rings at the ends projecting from the stack, oscillation problems that result during operation with frequency converters are intended to be solved. In addition, higher natural torsion frequencies are intended to be achieved on the rotor, that is, the construction is to be made less sensitive by simple modifications to the squirrel cage in order to prevent the resonance effects. This object is attained in that respectively two, three or more short-circuit rods are guided together to rod assemblies at their ends, and these are connected to the short-circuit rings with material-to-material bonding.

Abstract: A switched reluctance machine comprises a stator having an even plurality of salient stator poles, each of which having a stator winding disposed thereon and electrically coupled one to another to form diametrically opposed pole pairs which may be coupled to an external source of electrical energy, a rotor having an even plurality of salient rotor poles, and at least one compensation coil disposed on each of the rotor poles. The compensation coils are electrically coupled one to another to form diametrically opposed compensation pairs in which flows a flux generating current when one of the stator windings of a pole pair is either open of shorted. The flux generated equalizes the unbalance forces resulting from the faulted stator winding, thereby increasing the fault tolerant capability of the switched reluctance machine.

Abstract: A rotor for short-circuited alternating current motors, having a pack of circular rotor blades fixedly mounted on a shaft, the plates have, uniformly around the peripheral edges thereof, a number of recesses which, when the plates are packed, form generally axially extending rotor slots, and each rotor slot includes a first recess or cavity whose peripheral edge forms a closed contour and which accommodates a conductor radially inwards of the mantle surface of the rotor, the peripheral edge of said first recess has a concavity which faces towards said peripheral edge, and a second recess which forms a radially extending slot which extends from a point close to the concavity and out towards said peripheral edge, a bridge is formed between the first recess and the second recess, and the second recess has a widened part which is located between the concavity of the first recess and the peripheral edge.

Abstract: A rotor 14 for a high speed induction type ac motor having a construction such that the rotor is provided with an iron core 20 provided, at the periphery thereof, with a plurality of through-bores 22 in which electro-conductive rods 24 made of aluminum rod members are forcibly inserted in a press-fitting manner so as to form opposite projections from the axial opposite ends of the iron core 20, electro-conductive end rings 26 connected to the projections of the electro-conductive rods 24, and slitted pins 30 press-fit in small blind bores 32 formed in the projections of the electro-conductive rods 24 to thereby fixedly attach the electro-conductive rings 26 to the opposite end faces of the iron core 20.

Abstract: A variable reluctance drive system including a motor and corresponding converter for improved current commutation is described. The motor incorporates a salient pole rotor and a salient pole stator having one or more full pitch windings which operate by mutual inductance to transfer the current from the active short pitch winding following phase alignment. This increases output torque and/or speed and permits a number of simple and economical converter circuits.

Abstract: A slotless, brushless, large air gap electric motor comprises a stator having a field winding and field backiron, the field winding being composed of a plurality of successively offset polygonal shaped turns so as to provide a substantially flat winding, and a rotor disposed within the stator including a shaft with a permanent magnet mounted thereon. The field winding turns are preferably in the shape of a rectangle or a hexagonal. Also disclosed is a commutation scheme which dissipates energy stored in a section of the field winding previously energized to the section of the field winding subsequently energized; an integrated circuit for control of any motor using that commutation scheme; a winding configuration suitable for use with both an alternating and direct current power supply; and efficiency increasing magnetically permeable flux shorting elements.

Abstract: A rotor for use in a generator or a motor wherein damper bars extend through rotor laminations and at least one of the damper bars extends from the laminations to provide support for a coil portion. In a preferred manner the damper bar extends from opposing ends of the laminations.

Abstract: An asynchronous motor comprising a stator 1, a rotor including a core 2 and a multilayer screen 3. Each layer 4 of the screen 3 is made of an iron-containing alloy of high electrical conductivity, the value of electrical conductivity in each of the succeeding layers, in the direction of the rotor axis, being assumed to be decreasing.

Abstract: A variable speed controllable induction motor comprises a single rotor formed in one-piece having different sets of rotor conductive members effective respectively at different speed ranges, that is, at least a set of first conductive members specifically effective for a lower speed range and a set of second conductive members specifically effective for a higher speed ranges; a plurality of stators disposed side by side surrounding and facing respective portions of said rotor; and a phase shifting apparatus for producing phase differences on the respective portions of the rotor conductive members. The motor can achieve an overall wide range speed control due to the combined effects of the characteristics obtained respectively from the different set of the rotor conductive members.

Abstract: In an end-plate-less formed pole (1) for electric machines with salient poles, combined clamping and support elements (26, 27) which are used both for clamping together the single laminations (2) and for supporting the pole coils (41) are provided in the area close to the axis, in addition to the conventional clamping elements (8, 10). In addition, these elements are used for anchoring the damper plates (44, 45) and flexible link pieces (46) of the damper rods (43).

Abstract: An alternating-current electrical generator including a permanent magnet rotor, a toothed stator and at least two non-overlapping windings associated with the teeth of the stator. Each winding is substantially similar to but independent of the other winding or windings. An end of each winding is separated from an adjacent end of an adjacent winding by at least one tooth having thereon a short-circuited low-resistance winding.

Abstract: A rotor for an electric motor with a spherical surface consists of a ring of soft iron and a squirrel cage made preferably from copper. The squirrel cage consists of copper bars lying in spiral grooves and a cooper ring on each axial end of the iron ring, short-circuiting all bars. The pole segments between the grooves do not have pole shoes. A cap made of ferro-magnetic metal covers the windings and acts magnetically in the same way as pole shoes. The cap surrounds the hollow spaces between the ring and the cap. The squirrel cage will preferably be cast by filling the spaces with molten copper during manufacture.

Abstract: A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator being driven by a shaft coupled to the motive power source and power converters mounted on the shaft to transfer power between the exciter and the main generator. At shaft speeds below synchronous speed, i.e. that speed which would produce the desired output frequency when DC power is coupled to the main generator field windings, the exciter output is rectified and inverted so that alternating current power of proper frequency is delivered to the field windings of the main generator to maintain the output of the generator at a constant frequency. At synchronous speed, the power converters transfer substantially only DC power to the main generator windings.

Abstract: A synchronous motor which has a ring-shaped stator with a radially magnetized ring-shaped permanent magnet and an external housing of a material of high permeability to complete the magnetic circuit. At the inner side of this ring-shaped stator lies a rotor having a central core provided at its ends with pole rings of a material of high permeability. The coil of the motor is provided in the center of the stator and mounted between the pole rings. This construction gives rise to a high magnetic flux in the permanent magnet in the region of the poles of the rotor, which in turn, provides a high driving torque; while the rotor is made exclusively of material of high permeability, having a low weight and a low moment of inertia. Such motors, even when constructed to operate at relatively high power, are thus assured of positive starting.

Abstract: An end portion of a free conductor bar of a pole-face winding for the rotor of a large dynamoelectric machine includes a flat at its radially outermost extremity. The end fits loosely within an oversized hole in an amortisseur ring. The presence of the flat displaces the contact line between the end portion and the hole from a thin bridge region of the amortisseur ring to two lines of contact displaced inward into the body of the material of the amortisseur ring. The reduced contact force and the repositioning of the contact location avoids cracking in the amortisseur rings of large dynamoelectric machines.

Abstract: A turbine type synchronous motor capable of starting directly and asynchronously when coupled to a work-performing machine is constructed with a drum rotor of high mass, made of solid magnetic material containing iron, and having no damper winding. The field windings, short-circuited or closed through a resistance during starting, are radially disposed in insulated slots which are closed by insulated wedges wherein the insulation is of highly temperature resistant material.

Abstract: A laminated electromagnetic core incorporates a double layer winding with the core being formed from first and second sets of apertured laminations of which one set accommodates the conductors of one layer of the winding and the other set accommodates the conductors of the other layer of the winding the conductors being interconnected by end windings and adjacent laminations in each lamination set are displaced from mutual alignment to permit the conductor end windings to be of minimal length such that conductor ends which are to be interconnected adjoin one another, the end windings being formed as in situ castings.

Abstract: A four pole d.c. motor speed control is provided by connecting two of the opposed brushes together to ground and the intermediate brushes to separate terminals of a switch means which in energized positions connects a grounded power supply to at least one of the brushes. The switch means supplies various combinations including direct connection of the power supply to one or both of the brushes. Connection of the power supply through resistance means, connection of the other brush to provide a closed circuit across the windings or to provide a resistance in series with those windings.

Abstract: In a superconducting generator rotor, inner and outer rotor structures are rigidly connected against torsional and axial relative movement at one end of the rotor. At the opposite end of the rotor a sliding support permits relative axial movement of the inner rotor relative to the outer rotor during cool down. The sliding support connection of the inner rotor to the rotating outer rotor and stub shaft of the generator power train is closed by a flexible diaphragm which has protruding axially therefrom a plurality of integrally attached fingers. These fingers, at an outside radial surface, bear into a complementary cylindrical cavity in the end of the stub shaft having female spline receiving concavities. During thermal axial excursion incident to cool down, the fingers by sliding into and out of the spline concavities in the stub shaft accommodate relative axial movement of the inner rotor relative to the outer rotor.

Abstract: Alternating-current, brushless, stator-controlled, asynchronous or synchronous-running, induction machines having a rotor with asymmetry in two axes electrically at right-angles, comprising two machine units coupled mechanically and electrically, to avoid the disadvantage of low-frequency currents in the mains supply experienced with single units. The coupled machine units are preferably combined in a single frame, providing right-angle electrical displacement between the two units. In one form, a single rotor is common to both stator elements. Asynchronous running is effected by extracting slip energy. Also synchronous running can be effected by d.c., as well as a.c., energizing of the stator windings. In neither mode of operation are connections to the rotor required.

Abstract: A dynamoelectric machine, having a laminated stator core and having low impedance short-circuiting rings positioned between end flanges to minimize voltage differences between key bars. Circumferentially spaced key bars are used to effect assembly of the laminations and the end flanges. Circumferentially aligned recesses are formed in the key bars spaced inwardly from the end flanges, and each short-circuiting ring is positioned within aligned recesses. The short-circuiting rings comprise a plurality of arcuate ring segments and are formed of a material of high conductivity. Bolts secure the segments to the key bars.

Abstract: Fractional horsepower induction motors having a fixed number of poles (and, accordingly, a single no load synchronous speed) that are particularly adapted for multi-speed operation when driving a fan load by changing the field strength of the main winding. Induction motors of N fundamental poles have squirrel cage rotor having a plurality of interrelated conductor bars and end rings that are arranged so that multiple sets of the rotor bars establish a predetermined number of separately identifiable cage sets such that the fundamental pole structure of the stator field is coupled with the rotor and such that the third harmonic of the stator field is not coupled with the rotor. The rotor slot number and total number of separately identifiable cage sets are selected so that a cage set pattern is provided that has two-thirds of a fundamental pole pitch.

Abstract: A shaded pole electric motor comprising a rotor, a stator. The stator has a plurality of generally radially extending poles each with a neck portion of lesser circumferential extent than the radially innermost ends of the poles. Adjacent neck portions of the poles form a kidney slot for receiving portions of stator windings. A main winding is wound around the neck portion of each pole. A shading coil slot which has its radially innermost end nearer the pole center than its radially outermost end. A shading coil and winding is positioned in such a manner that no portion of the main winding overlies the axially outer ends of the shading coil.

Abstract: A turbo-generator with a rotor winding includes a plurality of slots in which the rotor windings are inserted and a plurality of slot wedges, at least two slot wedges lying in each slot on the outside of the winding and being electrically connected with each other. A plurality of relatively thin pressure tubes of a deformable material such as copper are positioned in the slots between the wedges and the windings. Thereafter, the pressure tubes are supplied with a thermosetting resin through feed tubes, the resin being supplied at a sufficient pressure and in a sufficient amount to produce an expansion of the space within the tube by at least 50 per cent. The feed tube is then subjected to heat in a localized area, thus accelerating the curing of the resin in this area of the tube and forming a plug, after which the supply of pressure to the pressure tube is disconnected. After the resin in the pressure tube has hardened, the feed tube is removed.