Abstract: A device which can be used for current measurement is described hereinafter. According to one exemplary embodiment, the device comprises the following: a coil carrier extending along a longitudinal axis having a base body which in a central region has a section having reduced cross-sectional area, which is smaller than the cross-sectional area outside the central region, and a magnetic field probe having a ferromagnetic sensor strip, which is fastened to the coil carrier in the section having reduced cross-sectional area, and having a sensor coil which is wound around the coil carrier in the central region so that it encloses the sensor strip. The device also comprises a film which at least partially covers the section having reduced cross-sectional area. A secondary winding is wound around the coil carrier, wherein the secondary winding is wound around the film in the section having reduced cross-sectional area.

Abstract: A rotor for an asynchronous machine includes a laminated core and a short-circuit cage at least partially integrated in the laminated core. The short-circuit cage is designed with rods having or consisting of a first electrically conductive material and with short-circuit rings having or consisting of a second electrically conductive material. The short-circuit rings are indirectly or directly frictionally welded to the rods.

Abstract: A rotor core is provided for an electric machine. The rotor core includes a body extending a length along, and being configured to rotate about, a central longitudinal axis. The body includes spokes arranged radially about the central longitudinal axis and conductor openings arranged radially about the central longitudinal axis. The radial arrangement of the spokes and conductor openings about the central longitudinal axis includes an alternating pattern of spokes and conductor openings. The spokes include slots extending therethrough along the central longitudinal axis. The slots are positioned radially about the central longitudinal axis between adjacent conductor openings. The rotor core also includes conductors extending within the conductor openings of the body.

Abstract: According to one embodiment, a rotor is configured by a rotor core and magnetic poles. Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.

Abstract: An increase of the magnetization current can be restrained during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor 1 is configured by a rotor core 2, permanent magnets 3 having a small value as the product of the coercivity and the thickness in the magnetization direction thereof, and permanent magnets 4 having a large value as the product. When reducing a flux linkage of the permanent magnets 3, a magnetic field directed to the reverse direction of the magnetization direction of the permanent magnets 3 due to a current of an armature coil is caused to act on them. When increasing a flux linkage of the permanent magnets 3, a magnetic field directed to the same direction as the magnetization direction of the permanent magnets 3 due to a current of an armature coil is caused to act on them.

Abstract: A rotor has rotor cores divided in the axial direction. A permanent magnet is mounted at the position of each of the magnetic poles of cores. The permanent magnet of each magnetic pole is configured by a single tabular member that penetrates the two divided cores in the axial direction. Convex parts are respectively provided on the outer peripheries of the respective magnetic poles of the rotor cores along the axial direction of the rotor. The convex parts are provided to positions that are displaced for each of the two divided cores. The magnetic flux density increases in the convex parts, which becomes the magnetic pole center. Since the convex parts positions are displaced to each other, a skew function can be exhibited even if the permanent magnet is mounted at the same position.

Abstract: An electrical rotating machine includes: a rotating shaft; a rotor, equipped with permanent magnets, and formed to rotate with the rotating shaft, a stator disposed in opposition on an outside-diametral side and via a clearance with respect to the rotor; and anti-demagnetization conductors extending in the axial direction of the shaft, the conductors each being disposed inside the rotor, wherein: the anti-demagnetization conductors are provided in pairs of two for each of magnetic poles of the rotor; the two anti-demagnetization conductors forming a pair are electrically interconnected; and, inside the rotor, the two paired anti-demagnetization conductors are disposed at different-polarity sides of two corresponding permanent magnets in a circumferential direction of the rotor, the different-polarity sides each being more adjacent to the circumferential direction of the rotor than to an end portion of one of the two corresponding permanent magnets existing close to each other in one magnetic pole.

Abstract: A rotor for an electrical inductor motor or an induction generator includes a core having spaces formed in the core. The rotor also has a first end ring. The first end ring has a first hub portion. A first ring is connected to the first hub portion by first spokes. The rotor also has a second end ring. The second end ring has a second hub portion. A second ring is connected to the second hub portion by second spokes. The first end ring is secured to the core. The second end ring is rotated a predetermined amount so the first spokes are misaligned with the second spokes. The second end ring is connected to the first end ring and the core. The core, the first end ring and the second end ring form a substrate. An aluminum conductor is cast to the substrate. The aluminum conductor fills in the spaces and around the first and second spokes to form a cast rotor.

Abstract: In a rotating machinery having armature windings constituted by a lot of strands, when the armature winding is constituted by four layers, a step number of the strands becomes half with respect to two layers of armature windings so as to facilitate manufacturing an armature winding of 540 degree transposition in which a transposition pitch is elongated and a circulating current loss is reduced, but since an output voltage becomes twice, for securing a voltage limit value caused by an isolation resisting force, one layer of armature windings are constituted by sub windings separated into at least two layers in a vertical direction, a transposition is independently applied to each of the sub windings, the sub windings are connected to the armature windings of the other slot while keeping an isolation of the sub winding at an armature winding end region by at least two connecting methods, and the sub winding constructs a parallel circuit by the armature windings of a plurality of slots.

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: A control system that can accommodate the wide variations in the output of a generator, such as a permanent magnet alternator, while providing an output with relatively uniform phase ripple. The control system includes a zero crossing detector and variable ramp generator for generating control signals to a switching rectifier to generate a regulated DC signal.

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 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: 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: An electrical machine includes one or more multiple-phase electrical power windings and an auxiliary winding. The auxiliary winding when closed generates electromagnetic fields which partially cancel fields generated during the operation of the electrical machine. The result is reduced audible noise from the electrical machine.

Abstract: A solid rotor for an electric machine includes a short circuit ring of a metal material having good electrical conductivity. The short circuit ring is attached to an end face of the rotor, and includes at least two portions formed of different materials. A first portion of the short circuit ring is of a material which has essentially similar characteristics to the characteristics of the material of the rotor.

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: A reluctance machine including one or more damping windings placed within the stator or within the rotor which are used to store and provide energy so as to reduce unwanted machine vibration and noise, improve current commutation, and improve the efficiency and torque output of the machine.

Abstract: An electric motor for an x-ray tube of a medical imaging system is described herein. The electric motor includes a stator and a substantially cylindrical rotor. The stator includes stator winding slots and stator windings injected into the stator winding slots. The stator also has a stator bore. The rotor is rotatably mounted within a stator bore so that the rotor is coaxial with the stator bore. The rotor includes a rotor core, a plurality of rotor bars, and end rings. The rotor bars are at located in rotor bar openings at a periphery of the rotor. At least one of the rotor bars has a different cross-sectional area than one of the other rotor bars.

Abstract: Damper winding (13) for an elevator motor provided with permanent magnets (14). The damper winding consists of frames (16) surrounding each permanent magnet (14). Each one of the frames is electrically connected to the adjacent frame (16) or the frames are integrated together. The damper winding (13) can be used as a jig for positioning the magnets when these are being fixed to the rotor disc (6). In one of the embodiments, the magnets and damper winding are fixed to the rotor disc by a form-fit interlocking arrangement.

Abstract: Known bar windings and pulled coils are made of bent bar conductors with a constant cross section and thus insufficiently use the space available in the winding overhang. In addition, because of the bending radii to be respected, in particular in high-pole machines, long connection sections are obtained in relation to the pitch value, so that weight losses are increased. The disclosed shaped conductors are produced without bending radii in a single piece according to their final shape. Their cross section varies in the winding overhangs, so that the space available is utilized to a high extent and short connection sections are produced. Successive shaped conductors are arranged in different layers, so that interlaced multiphase double layers are produced. The length of a conductor lane formed by shaped conductors connected in series is independent from the depth of the grooves and all phase conductors of an interlaced double layer have the same design.

Abstract: A passive magnetic bearing structure for radially supporting a rotor with respect to a stator is provided, in which a magnetic circuit is mounted on the rotor or stator for generating two strongly different axial magnetic fields in two concentric angular gaps coaxial to the rotation axis and radially spaced from one another. At least three shortened superconducting turns are mounted on the stator circumferentially around the rotation axis so that under any tolerable shift of the rotor, one edge of every turn will be placed in one annular gap comprising magnetic field, and the radially opposite edge will be placed in the other gap.

Abstract: A brushless synchronous machine, for example a synchronous generator, having an exciter, whose field excitation winding is powered via a regulator connected to a separate auxiliary winding in the stator of the main machine in which the auxiliary winding has a number of phases that differs from the harmonic number of the harmonic wave that is the strongest in the event of a short circuit. In the case of a strong third harmonic wave, the auxiliary winding has a four- or five-phase design.

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 two-phase unipolar driving brushless DC motor of a radial gap type having a rotor position detector includes a main-pole yoke having main-poles, an interpole yoke coaxially provided with the main-pole yoke in a superposed manner and having interpoles and an axial short-circuit portion or member provided in an axially extending portion in magnetic fluxes formed in the main-poles and interpoles. This structure allows for easy winding of coils around the main-poles and enhanced winding space factor in order to increase the starting torque and to improve the motor efficiency.

Abstract: In a squirrel-cage rotor for an asynchronous machine, having a laminated core (2) which is mounted on the shaft (1), held together at both ends by press rings and is intended for accommodating the cage bars (3), the latter are respectively permanently connected to a short-circuiting ring (4) outside the laminated core (2). Each short-circuiting ring (4) is supported in the radial direction by a support ring (6) fixed on the shaft. In order to couple the cage head to the rotor body over the entire speed range of the machine for the purpose of suppressing natural vibrations, the two press rings are axially spaced from the laminated core (2) and simultaneously form the support ring (6) for the short-circuiting ring (4). In order to ensure the ventilation of the winding overhang, there are provided between the end face of the laminated core (2) and the support ring (6) spacer webs (7) which are preferably constructed in one piece with the support ring (6).

Abstract: Slot wedges, electrically-conductive, used in rotor slots, between rotor teeth, and overlying the rotor coils, are serially arranged in the slots and have arcuate grooves in opposite ends thereof. Inserts, also electrically-conductive, are spring-loaded in the grooves to effect electrical continuity fully therealong, lengthwise of the rotor, from wedge to wedge.

Abstract: Electrically-conductive, segmental, slot wedges, with electrically-conductive inserts therebetween, and electrically-conductive interconnects, between end ones of the wedges and the annular, end retaining ring, of a rotor, define an amortisseur winding for the rotor. The inserts are spring-loaded in end slots formed in the wedges, and in an embodiment of the invention, are formed of beryllium copper and are silver-plated. As is typical of rotors in electrical, rotating equipment, the slot wedges are formed of aluminum.

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: The core of the secondary for use in a linear or other induction motor is a ladder-like stamping with two spaced apart rails and a number of bars extending between and having end portions of one piece with the rails. The bars of the cage can be inserted into the recesses of a core, and such recesses can be provided in one side or in two opposite sides of the core. Each recess can receive a single bar or the bars of two or more discrete cores. The bars can be confined in their recesses by slidable closures or by plugs of a hardened adhesive, a synthetic resin or an impregnating agent.

Abstract: A connector assembly for a rotary electric machine which has a rotor fixed around a rotary shaft, a stator positioned around the outer periphery of the rotor and having a stator core clamped between a pair of insulators and a plurality of coils attached to the insulators. The rotary electric machine is further provided with a mounting section on one side of the insulator and a mounting block having a plurality of pins to be connected to successive terminal ends and starting ends of respective coils.

Abstract: A voice coil motor includes an upper yoke having a lower surface, and a lower yoke having an upper surface. Two upper side yokes are attached to the lower surface of the upper yoke respectively at laterally opposite end positions on the lower surface of the upper yoke. Two lower side yokes are attached to the upper surface of the lower yoke respectively at laterally opposite end positions on the upper surface of the lower yoke. A central yoke has two distal end portions respectively sandwiched between the upper side yokes and the lower side yokes. An upper magnet is attached to the lower surface of the upper yoke and located above the central yoke. A lower magnet is attached to the upper surface of the lower yoke and located beneath the central yoke. A rotary arm is pivotally mounted on the upper yoke. The rotary arm has a coil wound around the central yoke with a spacing being maintained therebetween so that the rotary arm is allowed to pivot along the central yoke.

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 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.