Abstract: A casting die includes a first ingate defining a first annular chamber and a second ingate defining a second annular chamber and spaced from the first ingate. The die includes a first end ring gate concentric with the first ingate and defining a first end ring chamber in fluid communication with the first annular chamber, and a second end ring gate concentric with the second ingate and defining a second end ring chamber in fluid communication with the second annular chamber. The die includes runners interconnecting the first and second end ring gates. Each of the runners defines a conductor bar channel in fluid communication with the first and second end ring chambers. The die includes an overflow gate disposed between the first and second ingates, wherein the overflow gate defines an annular overflow chamber in fluid communication with the conductor.

Abstract: Disclosed are various embodiments for an induction machine having a rotor comprising a plurality of rotor core assemblies configured to form a toroidal magnetic torque tunnel having at least a first inductive tunnel segment and a second inductive tunnel segment and a stator having a plurality of coils configured to form a coil winding assembly, the coil winding assembly positioned within the toroidal magnetic torque tunnel, such that at least one of the plurality of coils is surrounded by the first inductive tunnel segment or the second inductive tunnel segment, alternatively the rotor may be the coil winding assembly and the stator may be the toroidal magnetic torque tunnel.

Abstract: Asymmetric skewed rotors and an electric motor that incorporates said rotors. The rotor being are configured to rotate within a stator positioned to surround a portion of the rotors. The stator and rotors are aligned along a centerline (x). Each rotor includes an asymmetric feature, such that during operation dynamic balance results when the asymmetric feature on each rotor are aligned opposite one another perpendicular to the centerline (x) and static balance results when the asymmetric feature on each rotor are aligned opposite one another parallel to the centerline (x).

Abstract: An electromotive transmission device for a vehicle having an electric motor (2) comprising a stator winding (7) and a rotor (5). A drive shaft is driven by an input shaft (12) via a transmission. The transmission is arranged coaxially with the input shaft (12) and the electric motor (2). The stator winding (7) can be cooled by a cooling unit. The transmission has an annular support component, which is joined to the inner face of the radial end wall (11). Pressurized oil is supplied to a radially running annular passage (18) arranged in the end wall (11) and/or the annular support component. A plurality of spray outlets (19) are distributed around the circumference of the annular passage (18) or a radially running slot-like spray outlet. The spray or sprays from the spray outlets (19) are directed at the stator winding (7) and/or the rotor.

Abstract: A rotor is provided with injected fixing bars having functional pins formed in a single piece and including a bar and two functional pins. The functional pins include one or more fixing regions for tying of one or more rotor packages of plates of the rotor. A process is for manufacturing the rotor A rotary electric machine can include the rotor.

Abstract: Methods and systems for lubricating a rotating shaft are provided. The lubrication system, in one example, includes a pump coupled to a central lubricant channel, the rotating shaft having a plurality of channels, an air intake channel positioned parallel to an axis of rotation of the rotating shaft, and a first orifice of a first channel of the plurality of channels, where the first orifice is positioned between the air intake channel and the central lubricant channel.

Abstract: A rotating machine includes: an electric motor that includes a stator and a rotor that is rotatable relative to the stator; a rotary member to be rotated that is provided on the shaft; and a fastening member made of magnetic material and provided to fasten the rotary member to a shaft. The rotor includes: a rotor core made of magnetic material; a plurality of permanent magnets attached to the rotor core such that the permanent magnets are spaced from each other in a circumferential direction and magnetic poles of the permanent magnets that face an outer peripheral side of the rotor core in a radius direction of the rotor core have the same magnetic polarity; and the shaft. The shaft is made of magnetic material, provided to extend through a central part of the rotor core in an axial direction of the rotor core, and magnetized by part of magnetic fluxes generated from the permanent magnets.

Abstract: A compaction plate for magnetic mass is proposed. The compaction plate comprises a plurality of laminated magnetic sheets, the laminated magnetic sheets being fixed together with fixing and electric insulating means.

Abstract: A rotor includes a rotor iron core, a rotor shaft, and a fastening plate. The rotor iron core includes a first and a second end, and extends along an axial direction. The first fastening plate is fastened to at least the first or second end, and includes a through hole and a first runner. An inlet of the first runner communicates with the through hole. An outlet of the first runner is on a surface of a side of the fastening plate. The rotor shaft includes a second runner and a third runner in the rotor shaft. An inlet of the second runner is at one end of the at least one end of the rotor shaft. An outlet of the second runner communicates with an inlet of the third runner. An outlet of the third runner communicates with the inlet of the first runner.

Abstract: A stator assembly for a brushless DC motor includes a stator core including stator poles and an outer surface, at least one magnet wire wound on the poles forming stator windings, and a bus bar including a non-conductive mount arranged on the outer surface and conductive terminals. Each conductive terminal includes: a main portion mounted on the non-conductive mount substantially parallel to the longitudinal axis of the motor, a tang portion folded over the main portion from a first longitudinal end of the main portion, and a connection tab at a second longitudinal end of the main portion. At least a contact portion of the at least one magnet wire is wrapped around the tang portion and fused to make an electric connection to the conductive terminal, and the connection tab makes electric contact with a wire supplying electric power to the motor.

Abstract: The conductor bar for a squirrel-cage rotor comprises at least one end which is partially slit such that a section of the end forms two symmetrical branches relative to the slit. The centre of gravity of each branch is arranged such that the branches flare towards the outside of the bar under the effect of centrifugal force when the rotor is rotated.

Abstract: The disclosure relates to an electric induction machine in which a chamfer region is provided between each respective rotor groove and rotor bar at a position corresponding to a radially outer internal corner region of the rotor groove. Suitably, the chamfer region has a relative magnetic permeability less than that of the rotor frame, and an electrical resistivity higher than that of the rotor bar. Moreover, a minimum diameter of the chamfer region is suitably larger than a manufacturing-tolerances derived maximum clearance between the respective rotor groove and robot bar, if any.

Abstract: A stator assembly for a brushless DC motor includes a stator core including stator poles and an outer surface, at least one magnet wire wound on the poles forming stator windings, and a bus bar including a non-conductive mount and conductive terminals. Each conductive terminal includes: a main portion and a tang portion extending from a first longitudinal end of the main portion. At least a contact portion of the at least one magnet wire is wrapped around the tang portion and fused to make an electric connection to the conductive terminal. The tang portion has a smaller lateral width than the main portion and is folded over the main portion to capture the contact portion of the at least one magnet wire. A power wire supply electric power to the motor is coupled to the conductive terminal proximate the second longitudinal end of the main portion.

Abstract: A method for producing an electromagnetic component for an electric machine is provided. The method includes providing a metal sheet as a starting material; punching out a number of lamellae from the metal sheet; heat-treating the lamellae; and joining the heat-treated lamellae to form the component or a portion of the component. The electromagnetic component to be produced can be a laminated core, for example a stator core or a rotor core, and can be provided for use with the electric machine such as an electric motor.

Abstract: The rotor for a squirrel-cage asynchronous rotating electrical machine comprises two compaction elements clamping a cylindrical magnetic mass, short-circuit rings facing the face of the compaction elements opposite that in contact with the magnetic mass, and conductive bars housed in recesses in the magnetic mass and distributed evenly over at least one diameter of the magnetic mass such that the short-circuit rings and the conductive bars form a squirrel cage. Retaining means distributed over at least one diameter of each short-circuit ring and over at least one diameter of each compaction element interact so as to secure the short-circuit rings and the compaction elements together, the pitch circle diameters of the retaining means on the rings and the compaction elements being smaller than the pitch circle diameter of the conductive bars.

Abstract: An electric machine includes a stator and a rotor. The rotor includes stacked laminations forming a rotor core. The rotor rotates relative to the stator about a central axis. The rotor core has an outer diameter. Each lamination includes a plurality of magnet slots. Each magnet slot includes a ferrite permanent magnet located therein, adjacent pairs of the ferrite permanent magnets defining a number of poles. Each of the laminations includes a plurality of non-circular rotor bar apertures spaced about the central axis of the rotor and disposed adjacent to and radially inward of the rotor outer diameter. A non-cylindrical rotor bar is disposed in each respective of the plurality of rotor bar apertures. The rotor bars are formed of a conductive material, wherein at least some of the plurality of rotor bars collectively form a rotor bar cage.

Abstract: A rotor assembly of a generator includes a rotor core including a plurality of core poles defining a plurality of core slots therebetween. The core poles extend from a first axial end of the rotor core to a second axial end of the rotor core. A rotor winding is installed to the rotor core and has a plurality of core segments located in the plurality of core slots, and a plurality of end turns connecting the plurality of core segments. An end plate is located at at least one of the first axial end or the second axial end and includes a plate portion and a plurality of wedge ends extending from the plate portion. Each wedge end is located at a corresponding core slot. The end plate is supportive of the plurality of end turns of the rotor winding.

Abstract: A rotor of an induction machine includes a rotor core structure and a cage winding. The cage winding includes rotor bars in slots of the rotor core structure and end-rings connected to ends of the rotor bars. The ends of the rotor bars are attached to openings of the end-rings by expansion of the ends of the rotor bars in transverse directions of the rotor bars caused by axial press having been directed to the ends of the rotor bars. The material of the rotor bars is softer than the material of the end-rings. Thus, unwanted shape deformation of the end-rings can be avoided when the ends of the rotor bars are axially pressed. The material of the end-rings can be for example copper alloy with additions of chrome and zirconium, whereas the material of the rotor bars can be for example copper.

Abstract: A squirrel-cage induction rotating electrical machine comprises: a solid rotor, a stator, and bearings. The solid rotor includes a shaft part, a columnar-shaped rotor core part integrally formed with the shaft part and having rotor slots formed therein, and a plurality of conductor bars passing through the respective rotor slots and coupled together at both axial ends outside the rotor core part. The stator includes a cylindrical stator core provided radially outside the rotor core part, and stator windings passing through a plurality of respective stator slots which are formed in the radially inner surface of the stator core. An outer wall and an inner wall of each rotor slot are tilted at a predetermined angle or more with respect to a plane including a rotation axis of the shaft part.

Abstract: A device has a housing and rotors rotatably coupled to the housing. Each rotor has a magnet on at least one side of the rotor. Printed circuit board (PCB) stators are located axially between the rotors and coupled to the housing. The PCB stators have layers, and each layer has coils. The number of rotors disks is equal to the number of stators plus one. The stators are interleaved with the rotors. A shaft is coupled to the rotors and the housing. The shaft has a hollow section coupled to a source of a liquid coolant through a rotary connector and to radial channels in the shaft that dispense a liquid coolant between the rotors and PCB stators. The shaft has flanges with different diameters configured to receive the rotors disks with respective matching bore diameters. In addition, the housing has a sump to collect the liquid coolant.

Abstract: Methods and apparatus for open loop startup of a three-phase motor that reduces acoustic noise. During rotor alignment of the motor, there is a maximum level for a phase current to the motor. After the rotor alignment, open loop motor startup is performed during which the phase current has a first slope. At a selected time, such as when a frequency of the phase current reaches a first threshold, the phase current transitions to a second slope.

Abstract: An electromagnetic motor comprising an inner stator comprising a plurality of stator teeth, each surrounded by one or more turns of electrical wire, a controller which generates a set of currents that are applied to phase windings of the inner stator to generate a pattern of magnetic poles spaced around the inner stator, the spacing between the magnetic poles being larger than the spacing between adjacent teeth of the inner stator, an outer stator that is concentric with the inner stator and comprises an alternating set of magnet poles, the spacing between adjacent magnet poles being smaller than the spacing of the magnetic poles of a first array created by the controller, and an intermediate rotor part that is located between the inner stator and the outer stator and comprises an array of pole pieces, in which the pole pieces of the intermediate rotor part shape a magnetic flux acting between the inner and outer stators, and whereby in use the controller is arranged to control a torque applied to the rotor p

Abstract: A retarder-equipped rotating electrical machine includes a rotor, a stator, and a retarder rotor. The stator has teeth at regular intervals in a circumferential direction. One ends of the teeth are disposed to face the rotor. The retarder rotor has a magnetic member continuously in the circumferential direction. The retarder rotor is disposed to face the other ends of the teeth of the stator and configured to rotate integrally with the rotor. A rotor-to-stator pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the rotor and the stator. A stator-to-retarder rotor pole piece portion having pole pieces at regular intervals in the circumferential direction is disposed between the stator and the retarder rotor. Both pole piece portions are moved in the circumferential direction to switch between an operation as a motor or generator and an operation as a retarder.

Abstract: The magnetic sheet for rotor with a non-through shaft with no recess at the center thereof is intended to be inserted between two half-shafts of the rotor. It comprises at least one locking means intended to cooperate with adjacent elements so as to prevent a relative movement of said sheet relative to the adjacent elements.

Abstract: Provided is a rotor for an asynchronous rotating electrical machine that includes a cylindrical magnetic mass, two short-circuit disks, a non-through shaft that includes two half-shafts tightly holding the cylindrical magnetic mass and the two short-circuit disks each sandwiched between the half-shafts and one of the ends of the magnetic mass, and conducting bars housed inside the magnetic mass and distributed uniformly along at least one diameter of the magnetic mass such that the short-circuit disks and the conducting bars form a squirrel cage, and the half-shafts, the short-circuit disks and the magnetic mass form a gas-tight envelope.

Abstract: A rotor of a rotary electric machine includes a rotor shaft, a rotor core fixedly supported on an outer circumference of the rotor shaft. The rotor shaft is provided, in a cross section perpendicular to the rotation axis, with a first outer edge portion projecting in a radial direction of the rotor shaft, and a second outer edge portion arranged in line with the first outer edge portion one after the other in a circumferential direction of the rotor shaft. The rotor core has a core insertion hole into which the rotor shaft is inserted, and a shaft holding portion on an inner circumference forming the core insertion hole, the shaft holding portion being configured to hold the first outer edge portion from the opposite sides in the circumferential direction of the rotor shaft. The shaft holding portion is in a non-contact state with the second outer edge portion.

Abstract: Provided is a rotor for an asynchronous electrical machine having an end shaft that includes two half-shafts pressing against a cylindrical magnetic block and two short-circuit discs each placed between one different half-shaft and one of the ends of the cylindrical magnetic block. Each half-shaft includes at least one first means of retention, and each short-circuit disc includes on each of its faces at least one second means of retention and each end of the magnetic block includes at least one third means of retention, the first, second, and third means of retention mating with one another in such a way as to prevent the short-circuit discs from moving relative to the half-shafts and relative to the magnetic block.

Abstract: A rotor includes a rotor core having slots on an outer periphery to receive rotor bars, short-circuit rings bonded to ends of the rotor bars to electrically connect the rotor bars together, core retainers located across the rotor core in a direction along a rotating shaft, and a deformation prevention portion located between each short-circuit ring and the rotor core. The deformation prevention portion is fixed to the short-circuit ring and to at least a portion of at least one rotor bar to reduce bending deformation of the portion of the rotor bar in a direction tangent to an outer peripheral surface of a portion of the rotor core of the rotor bar.

Abstract: A rotor for an electric machine includes a laminated core and a groove which extend in axial direction from a first axial end to a second axial end along a rotation axis. The groove has a groove filling having a first material with a metal element of the periodic table. The groove filling has a cast metal region, which extends with an end region at the first axial end at least partially over the laminated core. The cast metal region extends through the groove from the first axial end to the second axial end, and fills up a first part of the groove with a first material. An insert fills up a second part of the groove with a second material which has the metal element of the periodic table. The insert part and the cast metal region are connected in a bonded manner by a connection zone.

Abstract: A method for producing a cage rotor for an asynchronous machine has the following steps: providing a laminated rotor core made of a plurality of stacked rotor laminations which each have a plurality of rotor lamination grooves distributed in the circumferential direction; placing rod-shaped wire bundles, which are each made up of a plurality of wires, into the rotor lamination grooves; rotating the individual rotor laminations relative to each other, thereby deforming the wire bundles; placing short-circuit rings on both end faces of the laminated rotor core, and connecting the wire bundles to the short-circuit rings.

Abstract: A method of manufacturing a laminated core includes supplying a stator material to a punching device and obtaining an electromagnetic steel plate corresponding to a rectangular processed body by punching the stator material. To obtain the electromagnetic steel plate ES, a slit is formed outside a processed body forming area in the stator material along a long side of the processed body forming area, and a center portion of the processed body forming area is punched out in a circular shape. Additionally, the processed body forming area is punched out after the slit is formed and the center portion is punched out. The laminated core is obtained by laminating and fastening a plurality of the electromagnetic steel plates.

Abstract: There is provided a rotary electric machine that ensures improving a maximum torque and a rated power factor while reducing an increase in a starting current. In view of this, the rotary electric machine includes a shaft, a rotor, and a stator. The rotor is fixed to an outer periphery of the shaft. The stator is located so as to surround an outer periphery of the rotor. The rotor includes a rotor iron core including a plurality of rotor slots located at predetermined intervals in a circumferential direction and rotor bars inserted into the rotor slots. Rotor slits communicate with outer peripheral sides of the rotor slots. The rotor slits have a width ws in a circumferential direction. The width ws is smaller than a height hs in a radial direction of the rotor slit, and when a rated current is denoted as I1, a turn ratio (primary/secondary) is denoted as Tr, and a magnetic permeability in a vacuum is denoted as ?0, a relationship of ws>?0×I1×Tr/0.6 is met.

Abstract: A producing method is for an electrical insulating structure to cover an outer surface of a to-be-insulated object. The method comprises: a tape production step of producing a main insulation tape by using a nanoparticle-containing joining macromolecular polymer; a taping step of winding a main insulation tape on outside of the to-be-insulated object to form a main insulated part; a vacuum drawing step, which is performed after the taping step, of vacuum drawing the tape-wound to-be-insulated object; and an impregnation step, which is performed after the vacuum drawing step, of injecting a impregnating macromolecular polymer to impregnate the main insulated part therewith.

Abstract: A producing method is for an electrical insulating structure covering an outer surface of a to-be-insulated object. The electrical insulating structure producing method comprises: a sheet production step of producing a main insulating sheet in which nanoparticles have been mixed; a cutting step in which the main insulating sheet is cut into main insulation tapes; a taping step of winding each of main insulation tapes on outside of the to-be-insulated object to produce a tape-wound to-be-insulated object in which a main insulated part is formed; a vacuum drawing step of vacuum drawing the tape-wound to-be-insulated object; an impregnation step of injecting a impregnating macromolecular polymer to impregnate the main insulated part in the tape-wound to-be-insulated object, and a solidifying step of raising the temperature of the insulated part to solidify the macromolecular polymer containing the nanoparticles.

Abstract: A repaired rotor of a multi-phase electric motor includes a plurality of annular laminations stacked to form a cylindrical core about a central axis, each of the laminations having notches aligned to form axially extending slots about a periphery of the core; a plurality of electrical conductors extending through the slots; a pair of conductive end rings, each attached to a different end of the cylindrical core and electrically connected to the plurality of electrical conductors; and an outer end ring abutting and electrically connected to one of the pair of conductive end rings and electrically connected to adjacent ends of the plurality of electrical conductors, the outer end ring providing an uninterrupted electrically conductive path connecting the plurality of electrical conductors.

Abstract: A rotor for an electric machine. A laminated core with a plurality of short-circuit bars that pass through it and are joined at both ends by way of a respective short-circuit ring. A support disc, which is made of a material that has a higher strength than the material of the short-circuit ring, is axially arranged at each short-circuit ring.

Abstract: A method of manufacturing a rotor of an electric motor or an electric generator includes positioning a plurality of amortisseur bars and using additive manufacturing to place electrically conductive material. More specifically, positioning the amortisseur bars may include circumferentially positioning the bars around a rotor stack and using additive manufacturing to place electrically conductive material may include forming a non-solid pattern of electrically conductive material, such as a pattern of electrically conductive traces, across opposite axial ends of the rotor stack to electrically interconnect an amortisseur circuit.

Abstract: Provided herein are systems, apparatuses, and methods of providing a centrifugally cast rotor assembly for an induction motor of an electric vehicle. The rotor assembly includes a rotor lamination stack with a cylindrical shape that terminates in a first end surface and a second end surface. The rotor lamination stack has multiple lamination discs, and each lamination disc has multiple rotor slots. The rotor assembly further includes copper bars disposed within the rotor slots, a first intermediary end ring disposed at the first end surface, and a second intermediary end ring disposed at the second end surface. A centrifugally cast first copper end ring that electrically and mechanically couples each of the copper bars is located proximate the first end surface, and a centrifugally cast second copper end ring that electrically and mechanically couples each of the copper bars is located proximate the second end surface.

Abstract: In a method for producing a squirrel-cage rotor for an asynchronous machine, conductor rods made from a first conductive material are inserted in substantially axial grooves of a laminated rotor core in such a manner that the conductor rods protrude from an end face of the laminated rotor core. A short circuit ring disc made from a second conductive material and heated above the recrystallization temperature is axially pressed onto the protruding conductor rods on the end face of the laminated rotor core, taking into account a temperature range, a deformation, and the rate of deformation of the short circuit ring, with a permissible shear stress of the first and second conductive materials being locally exceeded and material transitions being caused by diffusion at an interface between the conductor rods and the short circuit ring, thereby resulting in microwelding. Subsequently or simultaneously the short circuit ring disc is hot shaped.

Abstract: A machine (1) for homogenising a food substance has: a container (10) with a side wall (11) and a bottom wall (12) delimiting a cavity (10?); an impeller (30) with an impelling member (31) forming an impelling surface (31?,31?,31?) that is drivable in rotation (r) about a central axial direction (30?) of the impelling surface (31?,31?,31??) for imparting a mechanical effect to the food substance; and a module (20) which has a housing means (22?) that contains an inner chamber (22,22a) and that delimits a seat (21) for the container (10), the chamber (22,22a) containing an electric motor (24). The electric motor (24) has an output drive axis (24?) with a driver device (24?) configured to drive a follower device (35) of the impeller (30). The driver device (24?) and the follower device (35) are magnetically coupled through a sidewall (11) and/or bottom wall (12) of the container (10).

Abstract: An electrical machine includes a stator and a rotor in magnetic communication with the stator. The rotor has a cage construction, the rotor having a plurality of passages extending therethrough from a first end of the rotor to a second end of the rotor. A rotor cage has two end rings, one of the end rings disposed at each of the first end and the second end of the rotor, and having a plurality of conductor bars extending through the rotor from the first end to the second end and coupled with the end rings. The conductor bars each include a transition region adjacent to each end ring, and a central region disposed between the two transition regions. Each transition region includes at least one conductor bar dimension that increases proximate the end rings.

Abstract: The present disclosure provides a rotor mechanism includes a rotor core and a plurality of rotor bars. The rotor core has a plurality of insertion slots arranged along an edge of the rotor core. Each of the plurality of rotor bars has an insertion portion and two protruding portions. The insertion portions are respectively located in the plurality of insertion slots, wherein in each of the plurality of rotor bars, the two protruding portions are respectively connected to two opposite ends of the insertion portion and respectively protrude from two opposite sides of the rotor core, and the two protruding portions each has an extension direction, that has an angle with respect to an extension direction of the insertion portion, in order to clamp and fix the rotor core therebetween. In addition, the present disclosure also provides a method for manufacturing the rotor mechanism.

Abstract: A rotor fabrication method is provided. The rotor uses pre-fabricated conductive rotor bars in which the ends have been shaped and sized to fit within corresponding end cap receptacles. After assembly, the structure is compressed, thereby achieving mechanical and electrical coupling between the conductive rotor bars and the end caps. Locking members disposed at either end of the assembly maintain the desired level of axial compressive force on the structure.

Abstract: A method for producing a short circuit rotor, by providing a laminated rotor core with through openings for shorting bars of a squirrel cage as well as providing the shorting bars; inserting of the shorting bars into the through openings such that an axial overhang remains on both sides; placing a main disk with through openings on both sides for the shorting bars, whose axial length corresponds to the overhang, as well as an edge disk immediately adjacent to the main disk and the ends of the shorting bars. The main disk and the edge disk form a shorting ring of the squirrel cage, and the main disk and the edge disk are welded by radially encircling electron beam welding.

Abstract: A rotor for an asynchronous electrical machine comprising a magnetic ring comprising a plurality of layers of ferromagnetic metal sheets stacked axially and a squirrel cage having a plurality of conductive elements regularly distributed over the periphery of the magnetic ring and each having two opposite ends extending axially beyond the magnetic ring and each connected to a short-circuit crown, arranged axially on either side of the magnetic ring and intended to connect the ends of the conductive elements electrically. The rotor is segmented circumferentially into at least two rotor segments.

Abstract: A method of making an AC induction motor includes: providing a rotor and a stator for the AC induction motor; determining, for different geometries of an end ring of the rotor, a location of a first centroid of current density in the end ring; determining, for end turns of the stator, a location of a second centroid of current density in the end turns; selecting a geometry for at least the endring of the rotor so that an axial distance between the first centroid of current density and the second centroid of current density is minimized; and assembling the AC induction motor, wherein the end turns and the end ring have the selected geometries.

Abstract: An electric machine capable of easily and efficiently assembling a rotor core to a rotating shaft is provided. A rotor core is formed by laminating a first steel plate consisting of one or more electromagnetic steel plates having a first protrusion portion to be accommodated in a groove portion of a rotating shaft and a second steel plate consisting of one or more electromagnetic steel plates having a second protrusion portion to be accommodated in the groove portion of the rotating shaft. The first protrusion portion of the first steel plate has a first engaging portion deformed by a side surface of the groove portion of the rotating shaft. At least a part of the first engaging portion of the first steel plate is disposed in a space formed between a second protrusion portion of the second steel plate and the side surface of a groove portion of the rotating shaft.

Abstract: A rotor for an asynchronous machine includes a laminated core and a short-circuit cage which is at least partially integrated in the laminated core, in which the short-circuit cage is made of rods having or made from a first electrically conductive material and short-circuit rings having or made from a second electrically conductive material. A support ring is provided on at least one of the short-circuit rings and is in mechanical contact therewith. The at least one short-circuit ring and/or the support ring has a contour for creating the mechanical contact, and the mechanical contact is a press fit.

Abstract: A rotor for an induction motor includes a first shorting end ring, a second shorting end ring, and a plurality of conductor bars. Each conductor bar has a first end and a second end and is coated with an electrically conductive material. The first end of each conductor bar is in electrical and mechanical contact with the first shorting end ring, and the second end of each conductor bar is in electrical and mechanical contact with the second shorting end ring. The conductive material is disposed between each conductor bar and the respective shorting end rings.

Abstract: A damper pulley for a crankshaft includes a hub mounted on one end of the crankshaft, a rim connected to the hub, an oil seal mounted on an outer surface of the hub, and a wear-resistant insert member integrally mounted on the hub and making contact with the oil seal.