Abstract: A rotary actuator includes a stator assembly positioned within an outer enclosure. A rotor assembly is positioned adjacent to the stator and is configured to rotate relative thereto and about a centerline axis of the rotary actuator. Each of the outer enclosure, the stator assembly, and the rotor assembly are arranged to carry a magnetic flux therethrough and form a flux path loop, such that as a magnetic flux flows through the outer enclosure, the stator assembly, and the rotor assembly, a torque is generated by rotation of the rotor assembly relative to the stator assembly.

Abstract: A laminated stator core 10 and a manufacturing method thereof, the method including producing a plurality of core sheets 15 and 16 from a strip 33, ends 34 of the strip 33 being a part of a product without being cut twice, and rotating and laminating the core sheets. A laminated stator core formed by core sheets blanked from a magnetic strip, both ends of the magnetic strip being one of the sides of the core sheets, wherein the identically shaped core sheets each have a rotor space in the center thereof, each rotor space having a center located off-center in one direction with respect to each center of the core sheets, and the core sheets are rotated by a predetermined angle before being laminated with the rotor spaces vertically aligned.

Abstract: A stator includes a core holder and a stator core configured by split cores arranged so as to form the annular shape, and press-fitted into the core holder. Each of the split cores is configured so that a plurality of metal plates is layered and fixed to each other by dowel-fastening. Each of the split cores includes an outer circumference groove portion and a dowel-fastening portion, the outer circumference groove portion being formed at a portion of an outer circumferential surface of the split core radially outer than the dowel-fastening portion so as to be recessed in a radially inward direction of the stator core to include a predetermined depth.

Abstract: A stator core 10 and its manufacturing method, the stator core 10 including laminated stator core sheets 17, each of the stator core sheets 17 punched out from a magnetic metal sheet 32, a central portion of the magnetic metal sheet 32 previously punched out to form a rotor core sheet 36, the stator core 10 including a thin section 24 formed in a magnetic pole piece 19 of each of the stator core sheets 17, the thin section 24 formed by pressing both sides of the magnetic pole piece 19 in a thickness direction and radially-inwardly elongating the magnetic pole piece 19. The present invention prevents the magnetic pole piece 19 from being curved and improves interlocking accuracies and dimensional accuracies in blanking the rotor core sheet 36 and the start core sheet 17 from one magnetic metal sheet 32.

Abstract: An electric motor has a rotor (52) and a stator (60) equipped with salient poles on each of which is provided a winding (88 to 99), which windings together form a winding arrangement (85?), electrical connecting leads (88? to 99?) being provided between at least some of the windings. The stator (60) further has electrical connecting elements (108 to 119) that are arranged on at least one insulating carrier (102) and are equipped with contact elements (108? to 119?) and with mounting elements (108?? to 119??), which latter serve for electrical and mechanical connection to the connecting leads (88? to 99?). The use of a printed circuit board (140) formed with press-fit seats, to receive the contact elements, facilitates rapid, secure and automated connection of stator windings to other circuit parts, which is particularly useful in making low-voltage, high-current motors such as those used in mining.

Abstract: A rotor for a dynamoelectric machine may include a rotor shaft having a first shaft and a second shaft within the first shaft. The two shafts include discharge orifices for communicating a cooling fluid through the machine. A rotor core of the machine includes a lamination having an annular portion that circumscribes an open center, a plurality of pole portions extending outwardly from the annular portion, and coil winding regions adjacent to the pole portions. One or more channels extend between the open center and the coil winding regions to communicate a cooling fluid. Coil windings of the machine may be at least partially encased in insulators. Each insulator may include a fluid entry orifice located between the insulator ends to communicate a cooling fluid. An end plate of the machine may include fluid discharge outlets for communicating cooling fluid received from the coil windings.

Abstract: In a vehicle AC generator, a stator core (42) is formed by laminating thin steel sheets, the stator core (42) being provided with a plurality of slot portions (43) which accommodate a stator winding (41) and tooth portions (44) which define adjacent ones of the slot portions; the stator winding (41) is disposed in the slot portions to constitute a stator (4); the stator core (42) is filled with varnish (45) between laminates of each tooth (44) at least in an inner diameter end surface region which faces the rotor (3) and is coated with epoxy resin varnish (46) on the tooth surface of the inner diameter end surface region to form an anti-rust film.

Abstract: The present invention provides a dynamoelectric machine that suppresses the occurrence of insulation failure that accompanies oxidation of a stator core without lowering output, and that also suppresses stator temperature increases by transferring heat that is generated in a stator coil efficiently to a frame. A stator core is configured by laminating and integrating thin magnetic plates, and has an outer circumferential surface that has a cylindrical surface, and receiving grooves are formed on inner circumferences of openings of frames. The receiving grooves are constituted by: an annular axial surface that is constituted by a flat surface that is perpendicular to a central axis of the stator core; and a radial surface that is constituted by a cylindrical surface that is centered around the central axis. Metal surfaces of the thin magnetic plates at two axial ends of the stator core are held between each of the axial surfaces of the pair of frames in a state of close contact around an entire circumference.

Abstract: A rotating portion of a rotary electric machine includes a shaft arranged to extend along a central axis, and a rotor core fixed to the shaft. The rotor core includes a through hole group including a plurality of through holes extending through the rotor core in an axial direction. The through hole group is arranged not to be symmetrical with respect to any imaginary plane including the central axis.

Abstract: A method of manufacturing a laminated iron core using a die, includes punching out iron core pieces from a thin steel sheet material by a first working row, each piece having a spindle hole and a plurality of slot holes of a given configuration. Electrically insulating sheet pieces are punched out from an electrically insulating thin sheet material by a second working row, each piece having a spindle hole and a plurality of slot holes with a configuration similar to, but smaller than, the slot holes of the iron core pieces. Thereafter, the iron core pieces and electrically insulating sheet pieces are stacked such that edges of the slot holes of the electrically insulating sheet pieces extend outwardly beyond edges of the slot holes of the iron core pieces.

Abstract: In a method for manufacturing a lamination for a motor or generator where a plurality of the laminations are used to form a core of the motor or generator, a material strip of electrical steel is provided having a width substantially corresponding to half of an outer diameter of the lamination to be created. Slant cuts are made along the material strip to form trapezoids of substantially a same area. Two of the trapezoids are joined together along a side edge of each to form a hexagon. The lamination is then stamped from the hexagon.

Abstract: Disclosed is a core including a plurality of core layers in a laminated structure formed through one-directional press shearing and having an insulating layer formed on the surface thereof prevented from being damaged by burrs formed through the press shearing when a winding coil is wound on and around the core, and a motor having the core. The core for a motor includes: a plurality of core plates having a laminated structure formed through one-directional press shearing; and a chamfered portion formed on at least some of the corners of a face opposed to one face of the core plate to which force is applied by the press shearing.

Abstract: A rotor includes: a rotor core fixedly attached to a rotational shaft and having a magnet-inserted hole portion; a magnet inserted into the magnet-inserted hole portion; and a resin portion injected into the magnet-inserted hole portion. The rotor core is constructed by axially stacking a plurality of electromagnetic steel sheets. The electromagnetic steel sheets include: an electromagnetic steel sheet having the magnet-inserted hole portion and a weight-reducing-purpose hole portion provided separately from the magnet-inserted hole portion; and an electromagnetic steel sheet located on at least one axial end of the rotor core and having a portion covering the hole portion formed in the electromagnetic steel sheet.

Abstract: In a method for manufacture of electrical steel a liquid steel mixture is created with a specified mixture chemistry. A continuous casting is performed to convert the liquid steel mixture to a slab. Hot roll steel band is created from the slab which is then pickled and hot band annealed, and then a cold rolled steel strip is formed. In a continuous annealing line, the cold rolled strip is annealed to achieve a partial recrystallization with a smaller grain size than would be the grain size with a complete recrystallization. Electrical steel created by the method is used for rotors and matching stators of a motor with properties at high strength and low electrical losses.

Abstract: The invention relates to a rotor for an electric motor, comprising a rotor shaft, a rotor core stack that is attached to the rotor shaft, a ring member which surrounds the rotor core stack, and a gap located between the rotor core stack and the ring member. Adhesive is introduced into the gap for fastening the ring member to the rotor core stack. Molded articles that are used as spacers are admixed to the adhesive.

Abstract: A rotor for an electric rotating machine includes a rotor core and a plurality of magnetic poles. The rotor core is formed of a plurality of magnetic steel sheets laminated in the axial direction of the rotor core. The magnetic poles are formed on a radially outer periphery of the rotor core. The magnetic poles are arranged at predetermined intervals in the circumferential direction of the rotor core so that the polarities of the magnetic poles alternate between north and south in the circumferential direction. Furthermore, the magnetic steel sheets forming the rotor core are welded so that a plurality of welds are formed on one of radially outer and inner surfaces of the rotor core. Each of the welds has a pair of axial end portions that are offset from each other in the circumferential direction of the rotor core and electrically connected to each other.

Abstract: A rotor for an electric machine having a number of poles includes a shaft that extends along a portion of an axis and defines an outer surface. A first core portion is formed as a single inseparable component and includes a first portion that extends from the outer surface to a first outside diameter to define a first thickness, and a second portion spaced axially from the first portion that includes a reduced back portion that extends from an inside diameter to the first outside diameter to define a second thickness that is less than the first thickness. A second core portion is connected to the first core portion and includes a second outside diameter that is substantially the same as the first outside diameter.

Abstract: An object of the present invention is to provide a squirrel-cage induction motor with high efficiency. In a squirrel-cage induction motor including a stator in which stator windings are wound in a number of stator slots arranged at intervals in the vicinity of the inner periphery of a stator core and a rotor in which rotor conductors are embedded in a number of rotor slots arranged at intervals in the vicinity of the outer periphery of a rotor core and end rings are provided at both ends of the rotor core, the rotor core is formed of a plurality of blocks, an annular short-circuit ring is provided between respective blocks of the rotor core to short-circuit the rotor conductors, and laminated thickness of the rotor core is made larger than laminated thickness of the stator core.

Abstract: A stator for an electrical machine, in particular a rotary current generator, is proposed, in which the stator (36) is made by the flat-packet technique and comprises at least one stator iron (10) and a stator winding (30), and the stator iron (10) has a substantially annular-cylindrical shape, and the stator iron (10) has an axial direction (a) which is oriented in the direction of a cylinder axis, and the stator iron (10) has an end face, oriented in the direction of the cylinder axis and defining a slot area (ANut), and a ratio (A) formed of the slot area (ANut) and the end face area amounts to between 0.4 and 0.8.

Abstract: A motor includes an output shaft rotatably provided, a rotor fixed to the output shaft and rotatable with the output shaft, a stator formed by a lamination of plurality of electrical steel sheets made by a magnetic material, the electrical steel sheets being punched by means of a press working, a coil wound at the stator, and a case accommodating the stator and the rotor and including a holder for holding the stator. The electrical steel sheets are arranged at one end of the stator in a lamination direction thereof and at the other end of the stator in the lamination direction thereof respectively. The electrical steel sheets include surfaces each at which a shear droop is formed. The surfaces of the electrical steel sheets face each other.

Abstract: A rotary actuator includes a stator assembly positioned within an outer enclosure. A rotor assembly is positioned adjacent to the stator and is configured to rotate relative thereto and about a centerline axis of the rotary actuator. Each of the outer enclosure, the stator assembly, and the rotor assembly are arranged to carry a magnetic flux therethrough and form a flux path loop, such that as a magnetic flux flows through the outer enclosure, the stator assembly, and the rotor assembly, a torque is generated by rotation of the rotor assembly relative to the stator assembly.

Abstract: A first laminated body includes first and second laminated groups including respective convex parts alternately disposed. A second laminated body includes third and fourth laminated groups including respective concave parts alternately disposed. The convex part of the first laminated group is shaped to not be inserted into the concave part of the third laminated group and to be inserted into the concave part of the fourth laminated group, from a lamination horizontal direction. The convex part of the second laminated group is shaped to be inserted into the concave part of the third laminated group and the concave part of the fourth laminated group, from the lamination horizontal direction. The convex part of the first laminated group is press-inserted in the concave part of the third laminated group, and the convex part of the second laminated group is inserted in the concave part of the fourth laminated group.

Abstract: A laminated stator core 10, formed by laminating stator core sheets 17, each of the stator core sheets 17 punched out from a magnetic metal sheet 32 so as to have a common axis with a rotor core sheet 36 which punched out from the magnetic metal sheet 32 before the stator core sheet 17 is punched out; the stator core sheet 17 including a thin section 24 in a magnetic pole shaft piece 20; the thin section 24 formed by pressing a part or a whole of a magnetic pole shaft piece 20 in a thickness direction, and elongating the same in a radially inward direction; and further the thin section 24 having a thickness within 50-95% of that of the magnetic metal sheet 32 and a radial length within 30-100% of that of the magnetic pole shaft piece 20. This enables a magnetic pole piece 19 to be elongated to form the thin section 24 without adverse effect on magnetic characteristics thereof, and improves caulking accuracy and dimensional accuracy for blanking both of the core sheets 17, 36 from one magnetic metal sheet 32.

Abstract: A method for manufacturing a stator core (20) for an electric machine, in which a plurality of strip-shaped laminations (21) are first stacked to form an essentially block-shaped lamellas packet (40) that is then shaped into an annular form by means of roller bending in one of the subsequent steps so that the outer teeth are provided on the outer circumference of the lamination packets and has an axial direction (a) that corresponds to a cylinder axis (z), the annular form having axial end surfaces (46), wherein in another of the subsequent steps, the annular lamination packet (40) is plastically deformed in the axial direction (a) only on the outer teeth (70) of the axial end surfaces (46).

Abstract: A gap winding motor includes a stator and a rotor. The stator includes a stator core and air-core coils for generating a rotating magnetic field which are attached to an inner peripheral surface of the stator core. The rotor is disposed so as to face the stator with an air gap therebetween. A stator core is divided into two core portions in an axial direction of the motor, and a spacer is disposed between the core portions. A unique air-gap section is provided between the core portions, and coil terminal processes are performed in the air-gap section between the core portions.

Abstract: In a stator winding method for winding conductive wires 8 around teeth 4a to 4f of a stator core 4 having 3n teeth 4a to 4f and 3n slots 5a to 5f by use of a bobbin machine 12 having three nozzles 13, the slots 5a to 5f on both sides of the teeth 4a, 4d, 4f in the nth winding process are formed, in respective slot portions on the side of the teeth 4a, 4d, 4f in the nth winding process, so that respective depths “A” are all smaller than respective depths “B” of the remaining portions. At the final stage of the nth winding process, the nozzles 13 are moved from the interior side of the slots 5a to 5f toward the inner circumferential side of the stator core 3 and furthermore, the conductive wires 8 are wound around the teeth 4b, 4d, 4f so that each gap 14 between the conductive wires 8 wound around the teeth 4b, 4d, 4f and the conductive wires 8 wound around the teeth 4a, 4c, 4e is smaller than an outer diameter of the nozzle 13.

Abstract: A rotor for an electrodynamic machine includes a laminated core having a plurality of lamination segments arranged in series in an axial direction, wherein the laminated core includes cooling ducts formed by duct spacers disposed between axially adjacent lamination segments, wherein the duct spacers are configured to resist centrifugal forces acting on the duct spacers and are supported by axial bolts extending through the laminated core in the axial direction.

Abstract: A resolver rotor for a variable reluctance resolver includes a plurality of axially stacked rotor pieces. The rotor pieces are jointly fitted into one body. In the fitting of the rotor pieces, deformed portions are provided between a center of the radial thickness of the resolver rotor and a side surface thereof which is opposite to a stator-side surface thereof. The number of deformed portions is the same as that of projecting poles of the resolver rotor. The deformed portions are arranged at circumferential positions of peaks of the respective projecting poles. At those positions, concave portions are provided on the side surface to receive deformations caused by fitting the rotor pieces together. Thus, the stator-side surface of the resolver rotor is less affected by fitting of the rotor pieces together, preventing a reduction in the detection accuracy of the resolver.

Abstract: In an embedded magnet motor, radial magnets and first inclined magnets form north poles. The radial magnets and second inclined magnets form south poles. Core sheets each include preformed radial accommodating slots the number of which is expressed by P/2. Some of the preformed radial accommodating slots are short slots and the rest are long slots. The short slots are located at some parts of each radial accommodating slot along the axial direction. Radially inner ends of the short slots restrict the radial magnets from moving radially inward.

Abstract: Direct driven wind turbine includes a tower, a nacelle, a rotor blade, a radial flux generator with a stator and a rotor, wherein the lamination package of the generator is essential for the transfer of the torque in axial direction. By introducing this additional function to the lamination package, the generator can be provided without additional torque transferring housing. Preferably, the lamination package obtains this additional function by pressing together the laminations between the front plate and end plate by tensile bolts. This gives sufficient strength to transport the torque in axial direction through the laminations to the mounting points of the generator. Preferably, the laminations include cooling fins. Due to these measures the cooling of the generator improves and active cooling may become superfluous or the power can be increased. The housing of the laminations is an expensive, heavy and labour intensive part which is no longer required due to the invention.

Abstract: A motor includes a stator, a rotor, a shaft (50) and two end caps (10, 40), which are assembled together. According to the precision requirements, the outer circumference of the rotor core (20), and the outer circumference, the inner bore (33), the end surfaces of the stator core (30) are subjected to grind. The ground rotor core (20) is nested in the ground stator core inner bore (33), wherein the punched outer diameter of the rotor core (20) is equal to the punched diameter of the inner bore (33) of the stator core (30). The shaft (50) is pressed directly into the shaft bore of the rotor core (20) so as to tightly fit with the shaft bore of the rotor core (20).

Abstract: A method of making a motor stator core having a back iron and a plurality of teeth extending radially inward from the back iron includes providing the plurality of teeth and the back iron from oriented steel so that a magnetic flux transmission path is formed with superior properties in essentially one direction. At least one of the plurality of teeth and the back iron is annealed in selected portions so as to improve magnetic flux transmission in a second direction, different from the one direction.

Abstract: A laminated core (10) and a method for manufacturing the same, the laminated core (10) formed with a plurality of continuous segment core sheets (13) wound and laminated in a spiral form while connecting portions (12) mutually connecting the adjacent segment core sheets (13) are bent and side edges of the adjacent segment core sheets (13) are fitted with each other, the connecting portions (12) being located in an outer peripheral portion (11) of the laminated core (10), the laminated core (10) comprising: a concave cutout (19) provided at a radially outward side of the connecting portion (12), the concave cutout (19) allowing a radial bulge (18) to be accommodated within an outer circle of the laminated core (19), the radial bulge (18) formed at a radially outward side of the connecting portion (12) by bending the connecting portion (12); and an inward cutout (20) provided at a radially inward side of the connecting portion (12), the inward cutout (20) defining a bending position of the connecting portion (1

Abstract: A stator component whose composition and processing enable the component to axially compress magnetic sheets of a stator and also inhibit joule heating of the component to the extent that the need for a separate flux shield can be eliminated. The component is formed of a ductile iron alloy containing, by weight, about 3.25 to about 3.40% carbon, about 3.70 to about 3.80% silicon, about 4.50 to about 4.70% nickel, up to about 0.20% manganese, up to about 0.06% magnesium, less than 0.02% phosphorus, less than 0.02% sulfur, with the balance being iron and incidental impurities. Following heat treatment, the component exhibits properties that inhibit joule heating of the component by eddy currents induced by alternating magnetic fields of the stator.

Abstract: A rotating electric machine includes a shaft and an armature with a core that includes a shaft hole. The core includes a plurality of core materials that are laminated. When pressing in and fixing the shaft to the shaft hole, the shaft hole is applied with an ironing process in advance in order to rectify a cylindrical hole shape of the shaft hole.

Abstract: A method of manufacturing an electric rotating machine having a stator that includes a stator core having slots formed at an inner periphery thereof, and a stator winding constituted by conductive wires wound on the slots. The stator winding includes in-slot portions accommodated in the slots and turn portions each connecting each adjacent two of the in-slot portions outside the slots. The stator core includes a core member having at least three tooth portions extending in a radial direction of the stator core and a core back portion integrally connecting the tooth portions at a radially end side thereof. The core member is configured such that each of the first tooth portions folded toward the core back portion is capable of unfolding to extend between a corresponding adjacent two of the in-slot portions when the core member is at a predetermined axial position with respect to the stator winding.

Abstract: The electric rotary machine comprises a stator and a rotor. The rotor is incorporated rotatablly inside the stator keeping an air gap between the rotor and the stator, the rotor being divided into at least two of a first rotor and a second rotor in a direction of a rotating shaft thereof, and each of the first and second rotors having field magnets with different polarities disposed alternatively in a rotating direction of the rotor. A magnetic flux control mechanism controls effective magnetic fluxes by varying positions of the field magnets of the second rotor relatively with respect to that of the first rotor in at least the rotating direction of the rotor. The stator core is provided with a magnetoresistive layer that is interposed in the path of the effective magnetic fluxes in the stator core.

Abstract: A motor comprises a stator having a plurality of magnetic poles disposed at first predetermined intervals along an outer periphery thereof, and a rotor having a permanent magnet with poles magnetized alternately to have different polarities at second predetermined intervals and disposed rotatably around the outer periphery of the stator with a predetermined gap. The magnetic poles of the stator has extended portions formed in a manner to extend from magnetic polar bases into a direction generally parallel to the permanent magnet, and the extended portions are formed of a high-permeability magnetic steel sheet with silicon content less than 3.0 wt-%.

Abstract: A stator assembly adapted for use in an external rotor electric motor. The assembly includes a stator core having a hub, a plurality of teeth extending radially outward from the hub, a root tooth diameter and an outer diameter. Each tooth has a root, a neck extending from the root and a head opposite the root. The neck has a maximum width. Each adjacent pair of teeth has a pitch measured at the roots of the corresponding teeth. The assembly includes a winding wrapped around each tooth of at least three teeth of the stator core. A ratio of the root tooth diameter of the stator core to the outer diameter of the stator core is less than about 0.75. A ratio of the maximum tooth neck width to the tooth pitch measured at the root of the teeth is greater than about 0.36.

Abstract: An induction motor embodiment includes a stator defining a stator bore, the stator including a stator yoke having a stator yoke thickness and a plurality of stator teeth, the teeth having a common length, with each of the stator teeth including a stator tooth center portion that extends from a stator tooth bottom portion proximal the yoke to a stator tooth tip portion, with adjacent stator teeth defining a stator slot between them, each stator slot having a stator slot bottom that extends along a stator slot bottom length. In the embodiment, the center portion has a stator tooth width that is less than or equal to one half the stator slot bottom length. In the embodiment, the stator tooth width is smaller than a stator slot opening width distance. In the embodiment, a ratio of stator yoke thickness to stator tooth width is at least 5:1. A rotor is rotably mounted in the stator.

Abstract: A rotor for an electric machine includes a rotor carrier having a cylindrical axial support portion which extends axially with respect to an axis of rotation of the rotor, a sheet pack which includes a plurality of lamellar sheets and is attached to the axial support portion at an attachment area, and a first weld in the sheet pack at a predetermined distance away from the attachment area to fasten a plurality of the lamellar sheets together.

Abstract: The stator core is configured into a cylindrical shape by abutting a laminated core that is obtained by bending and forming a rectangular parallelepiped lamination and integrating the stator core by welding. The lamination is configured by laminating a predetermined number of thin strip-shaped magnetic plates that are formed so as to have a flat rectangular shape, and in addition at least two thin sheet coupling weld portions that integrate the predetermined number of thin strip-shaped magnetic plates by welding are formed so as to extend from a first end to a second end in a direction of lamination on an outer wall surface of the lamination and so as to have a predetermined spacing in a longitudinal direction of the lamination. The stator core is formed such that an axial length A at the thin sheet coupling weld portions and a maximum axial length B between the thin sheet coupling weld portions satisfy an expression: 0.0 mm?B·A?0.2 mm.

Abstract: The invention relates to a stator module for a synchronous machine with transversal flux guidance, in particular a transversal flux machine having at least one phase, having a stator unit that is provided for the single phase and bearing an armature winding and that, in the assembled position, is provided for a rotor with the formation of an air gap, which is arranged in the radial direction in relation to the axis of rotation of the rotor of the synchronous machine. Said stator unit comprises two rows of teeth that are arranged in succession in the circumferential direction, the rows being connected together by means of a yoke unit for conduction of the magnetic flux. The invention is characterized by the following features: the yoke has an annular design; the yoke unit comprises magnetic lamination sheets stacked in succession in the circumferential direction.

Abstract: A two-phase synchronous electric motor, comprising a permanent-magnet rotor rotating around a rotation axis, and a core lamination pack stator. First and second pairs of pole pieces define: a housing/rotation seat for the rotor. Each pole piece comprises a core, having an end associated to the core lamination pack, a free end portion facing the rotor housing/rotation seat, and a coil. The free end portion of the core of each pole piece comprises a core lamination pack extending in parallel planes to the rotation axis of the rotor. The core laminations have a variable length to form a surface of the free end portion of the core of each pole piece that is concave in the axial direction and partially wraps the rotor. A coupling between the rotor and a load is through a motion transmission joint having driving and driven elements associated in a kinematic series.

Abstract: A laminated core for a motor includes a plurality of laminations each of which are disposed in a non-spaced relation to an adjacent lamination and each of which have a disc-like configuration and wherein the plurality of laminations are each dimensioned and configured to provide for a flow of a cooling fluid traveling in a radial direction to a rotational axis of the motor. A method of cooling a motor is also presented.

Abstract: An AC-induction-motor rotor lamination has a longitudinal axis and circumferentially spaced apart and closed rotor slots. Each rotor slot includes first through fifth corners, a straight slot base, straight first and second slot sides, and first and second curved sides. The slot base extends from the first corner to the second corner, the first slot side extends substantially radially inward from the second corner to the third corner, and the second slot side extends substantially radially inward from the first corner to the fourth corner. The first and second curved sides extend from a corresponding one of the third and fourth corners to the fifth corner. A rotor lamination having slot sides extending substantially radially outwardly from the second and first corners, and rotor laminations having open rotor slots (with slot sides extending substantially radially inward or outward) are also described.

Abstract: An electric arc welding system is powered by a power generator with a rotor assembly circumferentially surrounding a stator assembly. The arc welding system generates a three phase AC current, which is converted into a DC current by a converter. An electrode coupled to the converter receives the DC current, wherein a welding arc is created between the electrode and a workpiece. A controller is coupled to the converter. The controller is operable to apply a control signal to the converter to cause the converter to vary the magnitude of the DC current.

Abstract: There is provided a stator in which a plurality of divided stators are annularly combined with each other, and each divided stator includes: a divided lamination iron core having teeth portion and a yoke portion, and constructed by laminating electromagnetic steel sheets divided by the teeth unit; insulating bodies provided at the divided lamination iron core; and concentrated winding wound around the divided lamination iron core through the insulating body. In this case, the divided lamination iron core is held by the insulating bodies and the concentrated winding.

Abstract: A stator assembly adapted for use in an external rotor electric motor. The assembly includes a stator core having a hub, a plurality of teeth extending radially outward from the hub, a root tooth diameter and an outer diameter. Each tooth has a root, a neck extending from the root and a head opposite the root. The neck has a maximum width. Each adjacent pair of teeth has a pitch measured at the roots of the corresponding teeth. The assembly includes a winding wrapped around each tooth of at least three teeth of the stator core. A ratio of the root tooth diameter of the stator core to the outer diameter of the stator core is less than about 0.75. A ratio of the maximum tooth neck width to the tooth pitch measured at the root of the teeth is greater than about 0.36.

Abstract: The invention concerns a polyphase stator (5) for a with rotating electrical machine claw-pole rotor comprising five or seven phases (132), a stator body having internally a plurality of notches delimited by teeth, each phase including at least one winding, each winding including coils with multiple turns, each coil enclosing a single tooth (61). The invention also concerns an alternator or an alternator starter comprising such a stator.