Class / Patent application number | Description | Number of patent applications / Date published |
310211000 | Squirrel cage | 89 |
20080296993 | ROTOR FOR AN ELECTRIC MOTOR - The invention provides a method of making a squirrel cage rotor for an electrical motor, and to a rotor for such a motor. The rotor comprises a rotor stack of a magnetically conductive material and a squirrel cage of an electrically conductive material. At least one of the short circuit rings are made by compression and sintering of a powder in which a solid element is embedded. The solid element facilitates manufacturing by increasing strength of potentially weak areas of the rotor, e.g. around openings into the shaft bore, rotor slots etc. | 12-04-2008 |
20100007234 | SQUIRREL-CAGE ROTORS AND METHODS OF MANUFACTURING SAME - A method of manufacturing a squirrel-cage rotor includes: providing a laminated stack; attaching a plurality of rotor bars to the laminated stack, wherein the plurality of rotor bars each include opposite longitudinal ends; and die-casting a pair of end rings at the longitudinal ends of the plurality of rotor bars. | 01-14-2010 |
20100102666 | METHODS AND APPARATUS FOR AN ELECTRIC MACHINE WITH A CAST ROTOR - A squirrel cage rotor structure used in connection with an electrical machine is formed from a high-strength, high-conductivity, and heat-treatable aluminum alloy, e.g., a T61 tempered aluminum alloy, such as A6101-T61. The resulting structure has improved strength compared to conventional pure aluminum structures, while at the same time limiting the reduction in electrical conductivity. | 04-29-2010 |
20100171387 | Die Cast Rotor With Steel End Rings to Contain Aluminum - 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. | 07-08-2010 |
20100301698 | Rotating Electric Machine and Manufacturing Method Thereof - A rotating electric machine includes: a stator and a rotor, wherein the rotor includes a rotor core in which rotor plates punched from roll formed magnetic steel plate are laminated, and a spider that retains the rotor core; the rotor plates and the rotor core include a plurality of keys arranged in their inner circumference contacting with the spider; the spider includes a plurality of keyways arranged in its outer circumference contacting with the rotor; a plurality of keys of the rotor core and a plurality of keyways of the spider are formed in such a manner that they fit with each other; and the plurality of keys of the rotor core and the plurality of keyways of the spider fit in a combination that renders a weight imbalance of the rotor core due to lamination of the rotor plates and a weight imbalance of the spider cancel each other. | 12-02-2010 |
20110074240 | SQUIRREL-CAGE ROTOR FOR AN ELECTRIC MOTOR AND ITS PRODUCTION METHOD - To provide a well balanced squirrel-cage rotor for an electric motor, quantities of braze used to bond various rotor components are different from each other so as to serve as balance weight in order to improve balance. | 03-31-2011 |
20110080067 | SQUIRREL-CAGE ROTOR AND MANUFACTURING METHOD OF SQUIRREL-CAGE ROTOR - A squirrel-cage rotor including a rotor core provided with a plurality of circumferentially disposed slot holes opened in a rotational axis direction of the rotor; a pair of end rings disposed at opposite sides of the rotor core in the rotational axis direction of the rotor, each end ring being provided with a plurality of circumferentially disposed through holes opened corresponding to the plurality of circumferentially disposed slot holes; and a plurality of bar elements respectively inserted through the plurality of slot holes and the plurality of through holes. Each of the pair of end rings is prepared by laminating a plurality of sheet members, and opposite ends of each of the plurality of bar elements and the pair of end rings are brazed together through a brazing filler metal sandwiched between adjacent sheet members in advance, the brazing filler metal being adapted to melt and flow when the rotor is heated. | 04-07-2011 |
20110084568 | Rotor for electric motor optimized for high power - A rotor for a high power electric motor intended to operate at particularly high rotational speeds. It includes a magnetic mass, gripped on either side by short circuit rings, and passed through at a plurality of notches by main bars forming a squirrel cage. The rotor also includes secondary bars passing through the magnetic mass via notches. The shape and arrangement of each notch is defined so as to ensure contact between the main bars and the secondary bars sufficient to allow the passage of an electric current when the rotor is in rotation. In particular, the invention applies to asynchronous motors capable of operating at high peripheral speeds typically starting at 100 m.s | 04-14-2011 |
20110140565 | INDUCTION MOTOR ROTOR, INDUCTION MOTOR, COMPRESSOR, FAN, AND AIR CONDITIONER - To provide an indication motor rotor capable of improving motor performance by concentrating portions under magnetic saturation conditions of rotor teeth. The rotor of an induction motor of this invention may include slots formed approximately in the shape of a T. The slots may be formed so that top slots are arranged on an outer peripheral portion of a rotor core, and bottom slots are arranged on an inner side of the top slots. The width in the circumferential direction of the top slot is wider than the width in the circumferential direction of the bottom slot, and the width in the circumferential direction of a rotor tooth between adjacent top slots is narrower than the width in the circumferential direction of the rotor tooth between adjacent bottom slots. | 06-16-2011 |
20110163627 | ALUMINUM BASED COMPOSITE SQUIRREL CAGE FOR INDUCTION ROTOR AND METHODS OF MAKING - A method of making a rotor is provided. The method includes mixing aluminum and carbon nanotubes; forming the mixture into an aluminum-carbon nanotube composite conductor bar; providing a laminated steel stack having a plurality of longitudinal slots; placing a plurality of the conductor bars in the longitudinal slots, first and second ends of the plurality of conductor bars extending out of the logitudinal slots; placing the laminated steel stack with the plurality of conductor bars in a casting mold having cavities for a pair of end rings wherein the first and second ends of the plurality of conductor bars extend into the cavities; and filling the cavities with aluminum, aluminum alloys, an aluminum composite, or combinations thereof. Rotors made from aluminum-carbon nanotube composite are also described. | 07-07-2011 |
20110175484 | METHODS OF MANUFACTURING INDUCTION ROTORS WITH CONDUCTOR BARS HAVING HIGH CONDUCTIVITY AND ROTORS MADE THEREBY - Squirrel cage rotors of aluminum based material end rings joined with high conductive and durable material (such as copper) conductor bars for use in electric motors and methods of making them are described. The methods include forming conductor bars by casting or other metal forming methods in the slots of laminate steel stack, or positioning the preformed or premade solid conductor bars in the longitudinal slots of the stacked laminated steel, with bar ends extending out of the laminated steel stack ends, optionally coating the extended part of the conductors (bars) with a latent exoergic coating containing Al and one or more conductor bar chemical elements, positioning the laminated steel stack having conductors (bars) in a casting mold that forms the cavity of both end rings of the rotor, filling the end ring cavities with aluminum melt, and allowing the end rings to solidify under pressure. Alternatively, the conductor bars and end rings can be made separately and mechanically joined together. | 07-21-2011 |
20110198964 | INVESTMENT CASTING OF INDUCTION MOTOR ROTORS - A procedure for casting a shorted structure around a plurality of induction motor rotors is described. The method comprises forming a wax representation of the shorted structure around a lamination stack; mounting a plurality of such lamination stacks in a mounting fixture and attaching a suitable gating and runner system; forming an investment by coating the structure with refractory followed by melting out the wax; casting molten metal into the investment while it is rotating and aligning the mold to allow the centrifugal force generated to promote mold filling; and, continuing to rotate the investment until solidification is substantially complete. | 08-18-2011 |
20110234039 | SQUIRREL-CAGE INDUCTION MOTOR - 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. | 09-29-2011 |
20110241473 | Electric Motor Rotor - A rotor of an electric machine is disclosed that resists expansion of the rotor components even at high rotational speed. The rotor includes first and second pluralities of laminations having slots to accept rotor bars. A support disk, also having slots, is placed between the laminations. The support disk, into which the rotor bars are slid, restrains the rotor bars from bending outwardly at high rotational speeds of the rotor. The rotor bars are further restrained at the ends by end rings, which have apertures into which ends of the rotor bars are placed. In some embodiments, containment rings are placed over axial extension of the end rings to prevent outward bowing at high speeds. In some embodiments, the rotor includes a stiffener sleeve to provide additional resistance to expansion during high rotational speeds. | 10-06-2011 |
20110254400 | TRACTION MOTOR - In one embodiment, a rotor for an induction motor comprises a punching assembly, a plurality of conductive bars, and an end-ring. The plurality of conductive bars may be substantially parallel to an axis of the rotor and connected to the punching assembly at a periphery of the punching assembly. Each conductive bar includes an end connected to the end-ring. The end-ring comprises a punching side having a surface facing the punching assembly and a housing side having a surface opposite the punching surface. The end-ring may be thicker on the punching side than the housing side. In this manner, the peak end ring stresses may be reduced at higher speeds and the mean time between failures of the rotor may be increased. Alternatively, the threshold speed may be increased and the top-speed of the off-highway vehicle may be increased for a given expected mean time between failures of the rotor. | 10-20-2011 |
20110291516 | ELECTRIC MACHINE ROTOR BAR AND METHOD OF MAKING SAME - A method, system, and apparatus including an electric machine having a plurality of rotor bars and a first coupling component configured to electrically couple the plurality of rotor bars together. Each rotor bar of the plurality of rotor bars includes a first metallic material having a first electrical resistivity and a second metallic material cast about the first material, where the second metallic material has a second electrical resistivity greater than the first electrical resistivity. The first metallic material has a first end and a second end opposite the first end and the first coupling component is coupled to the first end of the first metallic material. | 12-01-2011 |
20110291517 | METHOD AND APPARATUS FOR FABRICATING A ROTOR FOR AN INDUCTION MOTOR - A method for forming a rotor for an induction motor includes providing a rotor core including a plurality of conductor bar grooves having first and second ends corresponding to first and second ends of the rotor core wherein the conductor bar grooves are progressively larger closer to the ends of the conductor bar grooves. The rotor core is placed into a casting mold, and molten metal is introduced into a first end of the casting mold. The molten metal flows from the first end of the casting mold through the plurality of conductor bar grooves to a second end of the casting mold. The molten metal solidifies to form conductor bars in the plurality of conductor bar grooves and to form shorting rings across exterior portions of the end elements within the first and second ends of the casting mold. | 12-01-2011 |
20110316380 | SQUIRREL-CAGE ROTOR - The invention relates to a squirrel-cage rotor for an asynchronous machine. In order to increase the electrical efficiency for a cage rotor composed of two materials, the cage rotor comprises a rotor core ( | 12-29-2011 |
20120019091 | METHOD FOR MANUFACTURING THE ROTOR OF INDUCTION MOTOR AND THE ROTOR USING IT - A rotor of an ultra high speed induction motor includes a stacked body having a plurality of loop type steel sheets stacked to form a cylinder, with a plurality of slots circumferentially formed in a lengthwise direction of the stacked body. Loop type upper, lower end rings are disposed on the upper and lower portions of the stacked body and having a plurality of upper and lower through-holes, respectively, to correspond to the slots. Conductive bars are coated with fusible bonding flux and are inserted into the upper through-holes, the slots, and the lower through-holes such that the conductive bars are integrally bonded into the upper through-holes, the slots, and the lower through-holes, following the fusion and solidification of the fusible bonding flux. | 01-26-2012 |
20120091850 | ROTATING ELECTRIC MACHINE - A rotor slot is asymmetrically shaped with respect to a straight line drawn from the central axis of the rotation of the rotor in a radial direction, and has a slot opening, the circumferential width of which is smaller than that of the rotor slot, at the top of the rotor slot, so that a loss generated in the rotor due to a carrier harmonic component can be reduced and the power factor can be improved, enabling a current generated in an armature winding to be suppressed and thereby improving efficiency in a rated operation. | 04-19-2012 |
20120126656 | ROTOR ASSEMBLY AND METHOD OF MANUFACTURING A ROTOR ASSEMBLY - A rotor assembly for an electric device includes a laminated stack of electric steel sheets defining a plurality of longitudinally extending grooves. A conductor bar is disposed within each of the grooves. Each of the conductor bars includes a first end and a second end extending longitudinal outward from opposing axial end surfaces of the laminated stack. The first end and the second end of the conductor bars include a macro-sized locking feature. A first end ring is cast in place over the first ends of the conductor bars, and a second end ring is cast in place over the second ends of the conductor bars. The macro-sized locking feature in the first ends and the second ends of the conductor bars mechanically interlocks with the cast in place first end ring and second end ring respectively. | 05-24-2012 |
20120126657 | ROTOR ASSEMBLY AND METHOD OF MANUFACTURING A ROTOR ASSEMBLY - A rotor assembly for an electric device includes a laminated stack of electric steel sheets defining a plurality of longitudinally extending grooves. A conductor bar is disposed within each of the grooves. Each of the conductor bars includes a first end and a second end extending longitudinal outward from opposing axial end surfaces of the laminated stack. The first end and the second end of the conductor bars include a textured surface having micro-sized surface irregularities. A first end ring is cast in place over the first ends of the conductor bars, and a second end ring is cast in place over the second ends of the conductor bars. The textured surface in the first ends and the second ends of the conductor bars mechanically interlocking with the cast in place first end ring and second end ring respectively. | 05-24-2012 |
20120133236 | METHOD FOR PRODUCING BEVELED CAGE ROTOR AND BEVELED CAGE ROTOR - The invention relates to a method for producing a beveled cage rotor ( | 05-31-2012 |
20120153766 | Induction Rotor Having Improved Conductor Bar Profiles and Method for Forming the Same - A rotor core for an induction motor. The rotor core includes a body that at least (i) extends axially from an outer surface of the body inward toward a central axis, (ii) extends from a first axial end to a second axial end, and (iii) defines a plurality of internal grooves. Further, each groove at least (iv) includes an opening at the outer surface of the body, (v) is defined by two opposing walls, (vi) extends from the first axial end to the second axial end, (vii) extends axially between the opening at the exterior surface and an inward end, and (viii) includes a body section. And wherein (ix) at least one wall of the opposing walls of the groove includes, in the body section of the groove, an extended segment forming a portion of increased breadth for the groove. | 06-21-2012 |
20120187796 | CAGE ROTOR WITH STARTING BAR - The invention relates to a cage rotor for an asynchronous machine ( | 07-26-2012 |
20120217837 | ROTOR FOR AN INDUCTION MOTOR AND METHOD FOR FABRICATING - A method for fabricating a rotor assembly for an induction motor includes assembling a shorting end ring onto the rotor assembly which includes a steel laminate stack and a plurality of conductor bars. The shorting end ring includes a plurality of grooves aligned with corresponding portions of the conductor bars extending from a first end of the steel laminate stack. Assembling includes inserting the corresponding portions of the conductor bars into the grooves of the shorting end ring. The shorting end ring is affixed to the rotor assembly by applying a compressive force around a perimeter of the shorting end ring to deform the conductor bars. | 08-30-2012 |
20120217838 | METHOD AND APPARATUS FOR PRODUCING AN INDUCTION ROTOR - A rotor for an induction motor includes a rotor core having first and second ends and a plurality of conductor bars. Each conductor bar has a respective first end extending beyond the first end of said rotor core. Each first exposed end has a respective enclosed opening. The rotor also includes an end ring comprising a casting of material flowed between the respective first ends of the conductor bars and through the respective closed openings. | 08-30-2012 |
20120217839 | SQUIRREL-CAGE ROTOR FOR INDUCTION MOTOR - A squirrel-cage rotor includes a rotor core formed having a plurality of slots, a plurality of conductor bars inserted into the slots respectively and made of copper or copper alloy, two conductor end rings joined to the plurality of conductor bars on both end faces of the rotor core and made of copper or copper alloy and a reinforcing-member end ring attached to at least one of the conductor end rings and made of material having a specific strength greater than that of either copper or copper alloy. The plurality of conductor bars are arranged so as to extend through the conductor end rings and the reinforcing-member end ring. Consequently, the rotor can be manufactured by any manufacturing method but die-casting. Further, the conductor end rings can be reinforced with an easily-obtainable material and additionally, the junction of conductor end rings can be easily viewed from an outside. | 08-30-2012 |
20120228985 | SQUIRREL-CAGE ROTOR OF INDUCTION MOTOR AND PRODUCTION METHOD THEREOF WHEREIN END RING IS BRAZED WITH BAR - A squirrel-cage rotor of an induction motor and a production method thereof, wherein locating of the brazing material is not necessary in order to reduce manhours for brazing, and a bar is easily connected to an end ring. Before assembling a rotor core, a silver plated layer is formed on at least one of an end ring and a conductive bar. In order to melt the silver plated layer, the rotor is heated to a temperature which is equal to or larger than the melting point of the silver plated layer. The melted layer functions as a brazing material, whereby the end ring and the conductive bar are connected. | 09-13-2012 |
20120262024 | Squirrel-Cage Rotor And Method For Producing Such A Squirrel-Cage Rotor - Squirrel cage rotor and method for the production thereof including a rotor shaft having a solid rotor portion formed of ferromagnetic material having a plurality of through-passages extending in an axial direction of the rotor shaft, a plurality of electrically conducting bar elements each received in a through-passage so that the respective bar elements extend in the axial direction. The bar elements each have a first longitudinal end and a second longitudinal end, and two electrically conducting end elements which electrically connect the longitudinal ends to form a squirrel cage is formed by the bar elements and end elements. The bar elements are received in the through-passages in such that relative movement in the axial direction between the solid rotor portion and the bar elements is enabled when there is a change in length of the bar elements and/or of the solid rotor portion. | 10-18-2012 |
20120267978 | SQUIRREL-CAGE ROTOR FOR ASYNCHRONOUS MOTORS - A squirrel-cage rotor for asynchronous motors is provided with a lamination stack made of a magnetic material and a plurality of bars, the intermediate portions of which engage respective slots of the lamination stack; the end portions of the bars protrude with respect to the lamination stack at both axial ends of the rotor and are fixed to two shorting rings; a plurality of spaces are defined, axially, by the lamination stack and the shorting rings, and tangentially by the end portions of the bars; part of such spaces is engaged by stiffening blocks arranged in contact with the end portions of the adjacent bars. | 10-25-2012 |
20120286617 | SUPERCONDUCTING ELECTRICAL MACHINE - A superconducting electrical machine | 11-15-2012 |
20120286618 | ELECTRIC MACHINE ROTOR BAR AND METHOD OF MAKING SAME - A method, system, and apparatus including an electric machine having a plurality of rotor bars and a first coupling component configured to electrically couple the plurality of rotor bars together. Each rotor bar of the plurality of rotor bars includes a first metallic material having a first electrical resistivity and a second metallic material cast about the first material, where the second metallic material has a second electrical resistivity greater than the first electrical resistivity. The first metallic material has a first end and a second end opposite the first end and the first coupling component is coupled to the first end of the first metallic material. | 11-15-2012 |
20120293036 | INDUCTION ROTOR ASSEMBLY AND METHOD OF MANUFACTURING SAME - A method of manufacturing a rotor assembly includes placing a generally cylindrical rotor core in a die. The rotor core has axial grooves spaced about a perimeter of the rotor core. The grooves may be formed by stacked laminated disks. Material is cast around the annular rotor core in the die such that the cast material forms conductor bars that fill the grooves and first end ring portions at opposing ends of the rotor core connected with the conductor bars. Each of the first end ring portions has substantially a first axial width. The rotor core with cast conductor bars and cast first end ring portions is then removed from the die. A respective second end ring portion is welded to each of the cast first end ring portions to form end ring assemblies. Each second end ring portion has a second axial width greater than the first axial width. | 11-22-2012 |
20130002084 | MOTOR ROTOR - A motor rotor has an outer casing, multiple silicon-steel sheets, multiple copper sheets and multiple copper bars. The silicon-steel sheets are stacked and mounted in the outer casing and each has multiple through holes formed through the silicon-steel sheet at intervals. The copper sheets are mounted in the through holes, extend out of the silicon-steel sheets and each has two side faces. Each side face of the copper sheet has a flat inner end and an outer end. The flat inner end of the side face of the copper sheet is flat to enable a distance between the outer ends of two adjacent copper sheets to be smaller than a distance between the flat inner ends of the adjacent copper sheets. The copper bars are inserted into the copper sheets from the flat inner ends to the outer ends of the side faces of the copper sheets. | 01-03-2013 |
20130020899 | METHOD AND APPARATUS FOR FABRICATING A ROTOR FOR AN INDUCTION MOTOR - A rotor core of an induction motor includes a cylindrically shaped steel laminate stack having a plurality of longitudinal grooves distributed around the periphery of the steel laminate stack. A plurality of conductor bars are each located in one of the plurality of longitudinal grooves and each includes a first end projecting from a first end of the steel laminate stack. A shorting end ring includes a plurality of grooves aligned with and mated to the first ends of the conductor bars. The shorting end ring is affixed to the rotor core assembly by a lock ring assembled when at a thermally expanded condition to the rotor core when at a thermally contracted condition. | 01-24-2013 |
20130026876 | STRENGTH CAST ROTOR FOR AN INDUCTION MOTOR - A rotor for an induction motor has a plurality of central laminations defining a central bore extending along an axis. End laminations are at each axial end of the central laminations. Metal is within gaps formed between lamination teeth. The end laminations have teeth extending radially outwardly from a central ring portion. A bore is formed in a face of the end laminations facing outwardly, and adjacent to where the teeth connect into the central ring portion. A motor and method are also described. | 01-31-2013 |
20130033144 | STIR-WELDED INDUCTION ROTOR - A stir-welded rotor includes a stack of laminations, where each of the laminations defines a plurality of spaced-apart slots arrayed on an outer circumference. A conductor bar may be registered with each of the spaced-apart slots of the stack of laminations, with each conductor bar including a first metal portion and a second metal portion having substantially dissimilar compositions. | 02-07-2013 |
20130043760 | ROTOR FOR ELECTRIC MOTOR AND BRAZING PROCESS - A plurality of conductor bars are positioned within slots of a laminated electric steel disc stack, and the ends of the conductor bars are brazed to end rings to manufacture a rotor. The method includes inserting the conductor bars into the slots of the disc stack, providing the end rings with slots for receiving the ends of the conductor bars; positioning spacers of braze material adjacent each end of each of the conductor bars to create a gap between the end rings and the steel disc stack; and applying heat to melt the braze material of the spacers whereby braze material is furnished by the spacers of braze material to braze the first and second ends of the conductor bars to the first and second end rings. Channels are provided in the face of the end rings facing the steel disc stack to drain away excess braze material. | 02-21-2013 |
20130062987 | CAGE ROTOR FOR AN ASYNCHRONOUS MACHINE AND METHOD FOR PRODUCING THE CAGE ROTOR - A method for producing a cage rotor for an asynchronous machine is provided. The method includes providing a rotor body having a conductor bar segment in which conductor bars are provided, producing conductor bar slots in the conductor bar segment, wherein one conductor bar slot is provided for each of the conductor bars and producing short circuit ring recesses for short circuit rings, wherein the conductor bar slots each open into the short circuit ring recesses, pressure die casting cage material in the conductor bar slots, in situ, so that the conductor bars are formed of the conductor bar material in the conductor bar slots and the short circuit rings are formed in the short circuit ring recesses, and generating an area in the conductor bar material and the rotor body material including a metallurgical bond between the conductor bar material and the rotor body material at interfaces between the conductor bars and the rotor body. | 03-14-2013 |
20130069476 | Rotor Design for an Electric Motor - A rotor assembly is provided in which a solid rotor ring is formed at either end of a stack of laminated discs, the solid rotor rings yielding improved electrical and mechanical characteristics in a low weight assembly. The solid rotor rings are fabricated by brazing slugs between the end portions of the rotor bars, the braze joints contacting a large percentage (at least 90%) of the rotor bar end portions. | 03-21-2013 |
20130093282 | CAST ROTOR AND METHOD - A method for forming a rotor assembly including a cast rotor frame includes positioning a preheated rotor core defining a plurality of passages in a mold cavity such that the mold cavity and the rotor core define the rotor frame including a plurality of conductor bars defined by the plurality of passages in fluid communication with first and second end portions of the mold cavity. Molten metal is quiescently introduced into the mold cavity through an ingate and simultaneously flowed through the plurality of passages prior to filling at least one of the first and second end portions of the mold cavity to form the cast rotor frame. Entrained air and impurities may be displaced from the passages by the flow of molten metal and vented or entrapped by a biscuit. The rotor frame and conductor bars thus formed may be characterized by high conductivity, negligible porosity, and minimal oxides. | 04-18-2013 |
20130106233 | SQUIRREL-CAGE ROTOR AND MANUFACTURING METHOD OF SQUIRREL-CAGE ROTOR | 05-02-2013 |
20130113331 | ROTOR OF AN ASYNCHRONOUS MACHINE WITH RETAINING ELEMENT - A squirrel-cage rotor of an asynchronous machine, in particular a die-cast rotor, includes a rotatable shaft, a laminated core being rotation-locked on the shaft and having grooves and opposing end faces. A squirrel-cage winding has rotor rods disposed in the grooves and a cage ring disposed on each of the end faces and electrically connecting the rotor rods. A pair of retaining elements is disposed on the shaft, wherein each retaining element extends in a radial direction in form of a disk or a spoke and has in an axial direction a wall and/or an axially extending finger. The wall overlaps on a radial periphery in the axial direction both the cage ring and a predefined axial section of the rotor rods that terminate in the cage ring, without increasing an external diameter of the laminated core. | 05-09-2013 |
20130127291 | ROTOR AND METHOD OF FORMING SAME - A method of forming a rotor, wherein the rotor includes a plurality of conductor bars each joined to a shorting ring, includes disposing an end of each of the plurality of conductor bars within a respective one of a plurality of cavities defined by the shorting ring. The method also includes, after disposing, deforming the end of each of the conductor bars, and brazing the end of each of the conductor bars to the shorting ring to form the rotor. A rotor includes a shorting ring defining a plurality of cavities therein each having a shape, a plurality of conductor bars each having an end disposed within a respective one of the cavities and joined to the shorting ring, wherein the end is deformable to the shape, and a braze material disposed in contact with the end of each of the conductor bars within a respective one of the cavities. | 05-23-2013 |
20130127292 | ROTORS OF INDUCTION MOTORS - A rotor for an induction motor includes a rotor body, the rotor body defining a central cavity configured to receive a motor shaft and having a plurality of radial slots formed therethrough, each radial slot of the plurality of radial slots extends outward radially from the central cavity to an outer surface of the rotor body, a plurality of conductive bars arranged within the plurality of radial slots of the rotor body, wherein each conductive bar of the plurality of conductive bars extend outward radially within each radial slot from the central cavity to the outer surface of the rotor body, a first end ring arranged on the rotor body in electrical communication with each conductive bar of the plurality of conductive bars, and a second end ring arranged on the rotor body in electrical communication with each conductive bar of the plurality of conductive bars. | 05-23-2013 |
20130154430 | INDUCTION ROTOR RETENTION STRUCTURE - A shorting ring support structure of a rotor of an electric machine has a radially outer ring and a member extending radially inwardly from the outer ring and defining a radial length, the radially extending member being spaced axially inwardly from opposing axial surfaces of a die-cast shorting ring whereby the radially extending member is fully embedded in the shorting ring for a substantial majority of its radial length. Rotor conductor bars and the shorting ring are formed of an integrally cast material that secures the shorting ring support structure to the rotor body. A method of manufacturing includes providing a shorting ring support structure and a rotor body, and then casting conductor bars in slots of the rotor body and a shorting ring on the rotor body to form a rotor, where an outer ring of the support structure defines the outer radial limit of the shorting ring. | 06-20-2013 |
20130175896 | ROTOR OF INDUCTION MOTOR, INDUCTION MOTOR, COMPRESSOR, AIR BLOWER, AND AIR CONDITIONER - A rotor of an induction motor according to the present invention is a rotor including a squirrel-cage secondary conductor, wherein the rotor slot is constituted by an outer circumferential slot formed near an outer circumference of the rotor and an inner circumferential slot communicating with the outer circumferential slot and formed inside of the outer circumferential slot, a circumferential width TC of an innermost circumference of the outer circumferential slot is smaller than a circumferential width TD of an outermost circumference of the inner circumferential slot, and a circumferential width of the outer circumferential slot is smaller as the outer circumferential slot approaches to the outer circumference of the rotor. | 07-11-2013 |
20130181570 | ROTOR OF INDUCTION MOTOR, AND INDUCTION MOTOR USING SAME | 07-18-2013 |
20130187511 | SQUIRREL-CAGE ROTOR OF AN ASYNCHRONOUS MACHINE AND METHOD FOR PRODUCING SUCH A ROTOR - A squirrel-cage rotor of an asynchronous machine includes a laminated core having grooves and positioned in fixed rotative engagement on a shaft, and a squirrel cage including short-circuit rods which are received in the grooves and have opposite front faces, and short-circuit rings which connect the short-circuit rods on the front faces. Shrink rings respectively surround the short-circuit rings at least radially outside and rest on the shaft. A pressure-resistant hardenable plastic is provided in a gap between the short-circuit rings and the shrink rings. | 07-25-2013 |
20130187512 | SQUIRREL-CAGE ROTOR - A squirrel-cage rotor of an asynchronous machine has a rotor bar ( | 07-25-2013 |
20130207505 | ROTOR WITH REINFORCED SQUIRREL-CAGE CONDUCTIVE BODY AND MANUFACTURING METHOD THEREOF - A rotor including a cylindrical iron core having a through hole for receiving a rotational shaft, and a squirrel-cage conductive body including a plurality of conductive bars and a pair of annular conductive end rings provided at both ends of the plurality of conductive bars is provided. The conductive bars extend along a direction in which the rotational shaft is received and are arranged at an outer circumference of the iron core at certain intervals. The rotor further includes a conductive reinforcing layer extends on at least a part of an outer surface of the conductive end ring. The conductive reinforcing layer is formed by spraying conductive particles in a solid phase onto the outer surface of the conductive end ring. | 08-15-2013 |
20130328436 | Squirrel-Cage Rotor and Rotating Electrical Machine - A squirrel-cage rotor includes a rotor core having in its circumferential direction a plurality of slots extending in an axial direction, a plurality of conductor bars stored in each slot of the rotor core and whose ends are projected from an axial direction end surface of the rotor core, and a pair of end rings arranged at the ends of the rotor core and each having a plurality of fitting portions into which the both ends of the conductor bars projecting from the axial direction end surface of the rotor core are fitted. In the conductor bar, among the cross-sectional shape in a plane perpendicular to the axial direction, the shape on the rotor central axis side is a circular arc shape. In the plane perpendicular to the axial direction, a gap is provided on the rotor central axis side of the fitting portion fitted with the conductor bar. | 12-12-2013 |
20140049134 | INDUCTION ELECTRICAL ROTATING MACHINE - Induction electrical rotating machine includes a stator which has plural stator slots | 02-20-2014 |
20140091668 | HYBRID ROTOR BAR ASSEMBLIES, ELECTRIC MOTORS INCLUDING HYBRID ROTOR BAR ASSEMBLIES, AND METHODS OF ASSEMBLYING SAME - Hybrid rotor bar assemblies and electric motors having hybrid rotor bar assemblies are disclosed, as are other aspects. The hybrid rotor tar assemblies have rotor bars lined with shims. The rotor bars can be copper rotor bars. In certain aspects, the shim may be about one fourth to about one eighth of a thickness of the rotor bar. Also disclosed are electric motors with shims lining the rotor bars and functioning as secondary rotor bars. | 04-03-2014 |
20140097720 | Production of die cast rotors with copper bars for electric motors - A rotor core for an electric motor includes a stack of laminations having peripherally spaced openings receiving copper bars with opposite end portions projecting from the stack. The core is mounted on an arbor and is inserted into a mold on a vertical die cast press having a shot chamber. The mold has upper and lower mold members defining annular cavities receiving end portions of the bars. Molten copper or aluminum is poured into the shot chamber and forced upwardly by a shot piston through passages in the lower mold member and into the cavity around the lower end portions of the bars. The pressurized molten metal solidifies and shrinks around the bar end portions to form an endring for the rotor. The core, endring and arbor are inverted and confined in the mold, and the casting steps are repeated to form the opposite endring. | 04-10-2014 |
20140132105 | CAST-IN-PLACE INDUCTION ROTOR END RINGS WITH IMPROVED INTERLOCKS - An induction motor has a rotor core including a plurality of conductor bars and a shorting end ring having a plurality of grooves aligned with and mated to the first ends of the conductor bars. The rotor core further includes a cylindrically shaped steel laminate stack including a plurality of longitudinal grooves distributed around the periphery of the steel laminate stack. The conductor bars are each located in one of the plurality of longitudinal grooves and each includes a first end projecting from a first end of the steel laminate stack. The rotor core further includes an end sheet located to the end of the steel laminate stack, the end sheet including a retention feature configured to retain the shorting end ring to the end sheet. | 05-15-2014 |
20140167554 | Squirrel Cage Rotor and Rotary Electric Machine - A squirrel cage rotor includes: a rotor core having a plurality of slots formed in a circumferential direction, each slot extending in an axial direction; a plurality of conductive bars housed within the respective slots of the rotor core and having both ends thereof projecting out from end faces in an axial direction of the rotor core; and a pair of end rings disposed at both ends of the rotor core, each end ring having a plurality of fitting portions into which respective end portions of the conductive bar projecting out from the end faces of the rotor core in the axial direction are fitted. A material of the conductive bar is an aluminum alloy having an aluminum component ratio of 99.00% or more, and a material of the end ring is an aluminum alloy having proof stress higher than that of the material of the conductive bar. | 06-19-2014 |
20140246943 | OPTIMUM ROTOR SKEW ANGLE FOR AN ELECTRIC MACHINE - An electric machine includes a stator core defining a number of stator slots (S) extending along a longitudinal axis and angularly spaced about the longitudinal axis. The machine includes a rotor assembly rotatable relative to the stator core and defining first and second ends. The rotor assembly includes a plurality of laminations stacked between the first and second ends. Each respective one of the plurality of laminations defines a number of rotor slots (R) positioned along an outer periphery. A stator slot pitch is defined as 360 divided by the number of stator slots (S). A rotor slot pitch is defined as 360 divided by the number of rotor slots (R) in each respective one of the plurality of laminations. The laminations are skewed relative to each other. An optimal rotor skew angle is determined by the greater of the stator slot pitch and rotor slot pitch. | 09-04-2014 |
20140246944 | ROTATING ELECTRICAL MACHINE AND ELECTRIC AUTOMOTIVE VEHICLE - A rotating electrical machine includes a stator having a stator core having a plurality of slots formed therein and a plurality of stator coils to be accommodated in the respective slots, and a rotor arranged on an inner peripheral side of the stator. The plurality of slots include a first slot and a second slot, and when a first ratio between the number of coils having the same phase to be accommodated within the first slot and the number of the plurality of coils exceeds a predetermined ratio, and a second ratio between the number of coils having the same phase to be accommodated in the second slot and the number of the plurality of coils is the predetermined ratio or lower, a width of a first slot opening that the first slot has so as to face the rotor side is 0 or wider, and is smaller than a width of a second slot opening that the second slot has so as to face the rotor side. | 09-04-2014 |
20140252910 | INDUCTION MACHINE - There is provided an induction machine having a squirrel-cage rotor, the rotor including: a rotor core; a plurality of rotor slots formed on the rotor core and aligned circumferentially at a predetermined interval; a plurality of rotor bars inserted into one of the plurality of rotor slots; and a plurality of rotor slits formed adjacent to the plurality of rotor slots on an outer circumferential side of the rotor core. The each rotor slit is formed as a hollow such that a cross sectional shape thereof is distinguished into three parts of a slit outer circumferential part, a slit intermediate part, and a slit inner circumferential part. A circumferential width of the each rotor slit on an innermost circumferential side is larger than that on an outermost circumferential side. A circumferential width of the slit intermediate part increases from an outer circumferential side toward an inner circumferential side. | 09-11-2014 |
20140285058 | SQUIRREL CAGE ROTOR AND INDIVIDUAL PARTS THEREOF AND METHOD FOR PRODUCING A SQUIRREL CAGE ROTOR - The invention comprises a squirrel cage rotor, in particular for use in an asynchronous machine, with a shaft, a laminated rotor core with cage bars and short-circuiting rings arranged within it, at least part of a short-circuiting ring consisting of a disk stack, which is built up in layers from disks with clearances, through which the ends of the cage bars extend out from the laminated rotor core, wherein the disks of a short-circuiting ring have, starting from the lateral surface as the outside face, over the outer circumference at least one bevel or step, which is directed radially inward, and wherein, by their respective bevels or steps, neighboring disks form in the disk stack a slot, in which there is a joining connection, at least in certain portions. | 09-25-2014 |
20140292135 | SQUIRREL-CAGE ROTOR AND ELECTRIC MOTOR HAVING SQUIRREL-CAGE ROTOR - A squirrel-cage rotor includes a laminated core provided on an outer circumference of a rotational axis, and a plurality of slots formed in the laminated core in a circumferential direction, so as to be spaced apart from each other. The cross-section shape of each slot includes an inner circumferential edge and an outer circumferential edge extending in the circumferential direction so as to face each other, and a first side portion and a second side portion extending in a radial direction so as to face each other. The radius of curvature of the inner circumferential edge is larger than that of corners on an inner circumferential side of the slot. The radius of curvature of the outer circumferential edge is larger than that of corners on an outer circumferential side of the slot. | 10-02-2014 |
20140306570 | CENTRIFUGAL CASTING APPARATUS AND METHOD - The centrifugal casting apparatus comprises: a lower half-mould ( | 10-16-2014 |
20140319956 | ALUMINUM ALLOY ROTOR FOR AN ELECTROMAGNETIC DEVICE - A rotor includes a shorting ring defining a plurality of cavities therein, and a plurality of conductor bars each integral with the shorting ring and having an end disposed within a respective one of the plurality of cavities. The shorting ring and each of the conductor bars are formed from an aluminum alloy including a lanthanoid present in an amount of from about 0.1 part by weight to about 0.5 parts by weight based on 100 parts by weight of the aluminum alloy. An aluminum alloy, and a method of forming a rotor are also disclosed. | 10-30-2014 |
20140319957 | LOW TORQUE RIPPLE ELECTRIC DRIVE SYSTEM FOR BAS APPLICATION - A BAS machine that includes a specific combination of the number of stator slots to the number of rotor bars to reduce torque ripple without the need for skewing the rotor bars. Particularly, the ratio of the number of stator slots to the number of rotor bars is selected to prevent first and second order harmonics between the stator slots and the rotor bars, where the ratio includes 36/26, 54/44, 72/56, 72/58 or 72/62 for a six pole machine, 48/36, 72/52, 72/58 or 84/86 for an eight pole machine, and 60/44 or 60/46 for a ten pole machine. | 10-30-2014 |
20140339950 | Rotor Assembly with Electron Beam Welded End Caps - A rotor assembly and a method for fabricating the same are provided in which a pair of end caps, positioned at either end of the stack of laminated discs, are fusion welded to the rotor bars using an electron beam welder, thereby yielding improved electrical and mechanical characteristics in a low weight assembly. | 11-20-2014 |
20150022049 | ROTOR FOR INDUCTION TORQUE MOTOR AND INDUCTION TORQUE MOTOR | 01-22-2015 |
20150084473 | INDUCTION MOTOR AND MANUFACTURING METHOD THEREOF - An induction motor includes multiple conductor bars buried and disposed in a rotor core in a circumferential direction, and end rings joined with the multiple conductor bars so as to cause respective both ends thereof to be electrically conducted. Each conductor bar includes a first bar-shape metal portion, and two second metal portions joined with both ends thereof. The second metal portion is formed in a solid block shape. The first and second metal portions are joined with each other by friction stir welding or friction welding. | 03-26-2015 |
20150102697 | ROTOR WITH 2-STEP SHAPED SLOT AND INDUCTION MOTOR HAVING THE SAME - A rotor with a two-step shaped slot may include a rotor core configured to include a plurality of shoe structures which have a two-step shaped slot, a plurality of rotor bars configured to be inserted into and coupled to the two-step shaped slot, and end rings configured to be coupled to both ends of the rotor core and to fix the rotor bars. | 04-16-2015 |
20150102698 | END-RING FOR INDUCTION MOTOR, ROTOR HAVING THE SAME - A rotor comprises a rotor core comprising a rotational axis and a plurality of slots, a plurality of rotor bars inserted in the plurality of slots, and a plurality of holders arranged around a rotational axis of the rotor. Each holder comprises an insertion groove configured to receive and engage with an end of one of the plurality of rotor bars. An end of another rotor bar among the plurality of rotor bars is interposed between and coupled to two immediately neighboring holders among the plurality of holders. | 04-16-2015 |
20150130321 | CASTING TECHNOLOGY FOR INDUCTION ROTOR ASSEMBLIES - An induction rotor assembly having an induction cage that is formed using a combination of liquid and solid materials. The first and second end plates of the induction cage may be fabricated before the casting of the conductors of the induction cage. According to certain embodiments, the first and second end plates may be assembled with first and second molds and a rotor core to form a casting assembly. A liquid casting material may be injected into the casting assembly, wherein the liquid casting material may solidify within one or more core passageways of the rotor core, thereby forming the conductors of the induction cage. The first and second end plates may also include flow channels that may be configured to facilitate the flow of the liquid casting material in the casting assembly, and increase the area of contact between the liquid casting material, when solidified, and the end plates. | 05-14-2015 |
20150295483 | CAGE ROTOR COMPRISING A DEFORMABLE BEARING - A cage rotor for an electric machine has a laminated rotor core having a groove, a rotor end ring that is cast on to one axial end of the laminated core and has a first material and a bar situated in the groove and supported by a deformable bearing having a bearing device. A laminated rotor core for a cage rotor includes a groove and a bearing device, an electric machine with a cage rotor, a method for producing a laminated rotor core by producing a bearing device on the laminated rotor core, and a method for producing a cage rotor by supporting a bar in a groove by a deformable bearing having a bearing device. | 10-15-2015 |
20150303781 | CAGE ROTOR AND BAR COMPRISING A NOTCH - A cage rotor for an electrical machine includes a rotor laminated core having a groove, and a short-circuiting ring having a first material and cast onto an axial end of the rotor laminated core. Arranged in the groove is a bar which has a bar end. The bar end penetrates into the first material of the short-circuiting ring and has a plurality of notches to provide the bar end with a greater flexibility. | 10-22-2015 |
20150333606 | ROTOR AND METHOD OF FORMING SAME - A method of forming a rotor includes inserting a conductor bar into a slot defined by a lamination stack to define a gap between the conductor bar and the lamination stack. The method further includes, after inserting, swelling the conductor bar within the slot to fill the gap and form the rotor. A rotor is also disclosed. | 11-19-2015 |
20150349616 | CAGE ROTOR OF AN ASYNCHRONOUS MACHINE - A cage rotor of a rotary asynchronous machine includes an axially laminated core having substantially axially extending grooves, at least one electrical conductor disposed in the grooves and composed of at least of two partial conductors constructed from materials having different electrical conductivities and different mechanical strengths, wherein the partial conductor made of the higher-strength material is disposed radially farther outwardly at least in sections of the groove, as viewed along the axial extent of the respective, and a short-circuit ring arranged on a respective end face side of the laminated core and electrically-conductively interconnecting the electrical conductors that are disposed in the respective grooves and protrude axially from the laminated core. | 12-03-2015 |
20150372576 | INDUCTION MOTOR SQUIRREL-CAGE ROTOR BAR RELIEF - A rotor bar relief system and a method of manufacturing a squirrel-cage rotor including a rotor bar relief system are disclosed where a plurality of rotor bars affixed within corresponding slots of an end cap of the shaft of the rotor and where each of the rotor bars has a relief formed in the end of the rotor bar affixed to the slots of the end cap. The reliefs may have a variety of cross sections and the slots may have a variety of shapes. The reliefs can be formed as the rotor bars are extruded or subsequent to production of the rotor bars. The rotor bars may be further inserted along a substantial portion of their lengths into slots in laminations of a core around the shaft. The rotor bars can be used in induction engines or induction generators and are useful in cryogenic systems. | 12-24-2015 |
20150372577 | Rotor, Reluctance Machine and Production Method for a Rotor - A rotor for a reluctance machine is provided. The rotor includes a cylindrical soft-magnetic element having cutouts for forming magnetic flux barriers. Some or all of the flux barriers are divided by one or more webs, with the profile of the individual webs forming a closed line which divides the rotor in the radial direction into an inner and an outer region. The cut-outs may be partially or fully filled with a a paramagnetic or diamagnetic filler material. | 12-24-2015 |
20160056698 | CAST COPPER ALLOY FOR ASYNCHRONOUS MACHINES - The invention relates to a copper alloy having the following composition (in % by weight): in each case 0.05 to 0.5% of at least three elements selected from the group consisting of Ag, Ni, Zn, Sn and Al, remainder Cu and unavoidable impurities, optionally 0.01 to 0.2% of one or more elements selected from the group consisting of Mg, Ti, Zr, B, P, As, Sb. The invention also relates to a current-carrying structural part made of a copper alloy and also to a cage rotor having a plurality of conductor bars and two short-circuiting rings, which are cast in one piece from a copper alloy. | 02-25-2016 |
20160079837 | SQUIRREL-CAGE ROTOR - The invention relates to a squirrel-cage rotor for an asynchronous machine, said squirrel-cage rotor having at least one laminated rotor core that comprises a plurality of grooves and said squirrel-cage rotor having at least one rotor cage comprising electrically conductive rotor bars that are embedded in the grooves of the laminated rotor core in such a manner that the rotor bars comprise at their two end regions an overlap beyond the laminated rotor core, and said rotor cage comprising short-circuit rings that are attached at the end face to the laminated rotor core and comprise a plurality of slots that are arranged in the region of their outer periphery and the end regions of the rotor bars protrude into said slots. The short-circuit rings comprise in each case at least two metal composite discs that comprise at least a first metal disc and a second metal disc that is connected in a planar manner to said first metal disc and is embodied from a different material thereto. Adjacent metal composite discs are arranged at least in part in such a manner that the first metal discs are facing one another. The rotor bars are bonded to the first metal discs in the region of the slots. | 03-17-2016 |
20160141944 | SHORT-CIRCUIT RING FOR AN ELECTRICAL ASYNCHRONOUS MACHINE, COMPOSED OF PARTIAL RING SEGMENTS - A short-circuit ring for a rotor of an electrical asynchronous machine is circular and has along its circumference a multiplicity of recesses extending in the axial direction, into which rods of a rotor cage of the asynchronous machine can be placed. The short-circuit ring is assembled from a plurality of partial ring segments. | 05-19-2016 |
20160156256 | GEOMETRY OF ROTOR END RING AND STATOR END TURNS | 06-02-2016 |
20160164387 | BASKET-TYPE ROTOR PRODUCTION METHOD AND BASKET-TYPE ROTOR - A squirrel-cage rotor manufacturing method capable of suppressing, at the time of performing die-casting, formation of gaps between closing portions and a rotor core at radially outer parts of rotor slots, or generation of a thermal stress in the rotor core as a result of expansion of the closing portions. The squirrel-cage rotor manufacturing method includes: arranging, through die-casting, conductors into rotor slots that are formed along a radially outer part of a rotor core; and performing the die-casting under a state in which radially outer parts of the rotor slots are closed with closing portions made of the same material as a material of the rotor core. | 06-09-2016 |
20160197539 | LAMINATION PACK AND METHOD OF FORMING SAME | 07-07-2016 |
20160204684 | SQUIRREL-CAGE ROTOR AND METHOD FOR MANUFACTURING SQUIRREL-CAGE ROTOR | 07-14-2016 |
20170237323 | ROTOR DESIGN FOR AN ELECTRIC MOTOR HAVING BRAZED STRUCTURE FOR CONNECTING ROTOR BARS | 08-17-2017 |
20180026505 | SQUIRREL-CAGE ROTOR, AND ASYNCHRONOUS MOTOR COMPRISING SUCH A ROTOR | 01-25-2018 |
20190149027 | SQUIRREL-CAGE ROTOR AND METHOD FOR PRODUCING A SQUIRREL-CAGE ROTOR | 05-16-2019 |
310212000 | Inherently variable impedance (double squirrel cage) | 1 |
20100253174 | INDUCTION MOTOR ROTOR, INDUCTION MOTOR, COMPRESSOR, FAN, AND AIR CONDITIONER - To provide an indication motor rotor capable of improving motor performance by concentrating portions under magnetic saturation conditions of rotor teeth. The rotor | 10-07-2010 |