Abstract: Squirrel cage rotors of aluminum end rings solid state welded to aluminum conductor bars for use in electric motors and methods of making them are described. In one embodiment, the method includes: providing a laminated steel stack having a plurality of longitudinal slots; placing a plurality of aluminum conductor bars in the longitudinal slots, the conductor bars having first and second ends extending out of the longitudinal slots; contacting the first and second ends of the conductor bars with a pair of aluminum end rings under pressure; and oscillating the first and second ends of the conductor bars, the end rings, or both to form an oscillation friction weld.

Abstract: 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.

Abstract: 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.

Abstract: 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 (1) having grooves (3), end rings (5) of a first material that are cast onto the rotor core on the end face, and conductors (4) that are arranged in the grooves and that are made of a second material that has an electric conductivity that is higher than the electric conductivity of the first material, wherein the conductors (4) comprise a coating (8) made of a coating material on the surface of the conductors, wherein the coating adjoins the second material of the conductors (4) by means of a first alloy layer (2) made of the second material and the coating material and adjoins the cast first material by means of a second alloy layer (9); made of the first material and the coating material.

Abstract: 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.

Abstract: 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.

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

Abstract: 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.

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

Abstract: A squirrel cage induction motor includes: a stator core (11); a plurality of stator slots (12) radially disposed in a circumferential direction of the stator core (11) with predetermined intervals; a plurality of stator windings (13) housed in the stator slots respectively; a rotor core (21); a plurality of rotor slots (22) radially disposed in a circumferential direction of the rotor core (22) with predetermined intervals; a plurality of rotor conductors (23) housed in the rotor slots (22) respectively. The stator windings (13) and the rotor conductors (23) includes electrically conductive materials mainly composed of copper. An area ratio of a total area of the stator slots (12) to a total area of the rotor slots (22) is not smaller than 2.7 and not greater than 8.0 to provide compatibility between the starting characteristic (starting torque) and the steady characteristic (for a high efficiency) can be provided.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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?1, in particular motors intended for gas or oil applications, whether land-, sea-, or undersea-based.

Abstract: A synchronous machine and a process for manufacturing a synchronous machine having permanent magnets arranged within the rotor such that the leak of magnetic flux generated by the magnets is reduced and having constructive characteristics that maximize the difference in the reluctances of direct axis and quadrature axis while providing the strength necessary for the good functioning of the equipment. Magnet-fixation grooves of the rotor are provided with elongated ends in a curved shape, a first elongated end extending from the first free end to a region adjacent the end of the rotor groove bottom, the first elongated end being configured from an opening in the rotor, forming reluctance-increase channels, a second elongated end of the fixation grooves being configured so as to form the reluctance-increase channel and extending from the respective second free-end portion toward the second free-end portion of the other fixation groove of the pair.

Abstract: 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.

Abstract: The invention relates to an asynchronous motor comprising a stator or a cage rotor, said cage rotor comprising a shaft (1) and a laminated bundle (2) and rotor rods (3) are arranged within the laminated bundle, running through the openings (10) of each end plate (9) at both ends of the laminated bundle (2) and terminated with a short-circuit ring (4) which electrically connects the ends of the rotor rods (3) on one side of the cage rotor. Each end plate (9) comprises a circumferential projection which at least partly covers the short circuit ring (4) on the outside thereof with a positive fit and each end plate (9) contains a part of the rotor rod (3) and a part of the short circuit ring (4).

Abstract: 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.

Abstract: In a rotary electric machine, for enhancing the reliability and reducing the size thereof, the rotary electric machine comprises a stator, and a rotor opposed to the stator and adapted to be rotated around a shaft, the rotor having an iron core formed therein with a plurality of axial holes formed in the iron core, a plurality of conductor bars inserted respectively in the holes, and end rings provided at the end parts of the conductor bars, wherein the outer peripheral parts of the end rings are electrically and mechanically joined to the conductor bars through friction stir welding, and the one end part of the conductor bar is axially projected from the end ring. With this configuration, it is possible to enhance the capability of heat radiation from the rotary electric machine and to enhance the design freedom of component parts around the stator and the rotor.

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

Abstract: The invention refers to a thermo dynamic system able to capture heat from the surrounding environment and transform it in mechanical energy which is to be used partially for self functioning while the rest is saved for a consumer. The system can work with any heat source, but is also designed for very small temperature differences between the warm and the cold source, which makes it fit for working with non-conventional energy, especially solar energy. The system can be used to provide heat, mechanical energy or electrical energy to both small and large consumers.

Abstract: The invention concerns a rotor of an electrical machine, particularly a driving motor for a hermetically enclosed refrigerant compressor with a body (4) comprising a magnetically conductive material, the rotor having a plurality of axially extending slots (5, 6), which are filled with an electrically conductive material. It is endeavored to achieve a good performance.

Abstract: The present invention relates generally to motor rotors. More particularly, the invention encompasses a motor rotor having at least one rotor bar. The invention also includes a system and method with a rotor having parallel sided rotor bars. The rotor bar preferably has a core and at least one layer of a rotor bar shim.

Abstract: 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.

Abstract: To provide an indication motor rotor capable of improving motor performance by concentrating portions under magnetic saturation conditions of rotor teeth. The rotor 1 of an induction motor of this invention may include slots 3 formed approximately in the shape of a T. The slots 3 may be formed so that top slots 3a are arranged on an outer peripheral portion of a rotor core 1a, and bottom slots 3b are arranged on an inner side of the top slots 3a. The width in the circumferential direction of the top slot 3a is wider than the width in the circumferential direction of the bottom slot 3b, and the width in the circumferential direction of a rotor tooth 4 between adjacent top slots 3a is narrower than the width in the circumferential direction of the rotor tooth 4 between adjacent bottom slots 3b.

Abstract: A rotor for an induction motor and a method of preparing same. The method includes making a squirrel-cage rotor made up of a cage and a laminate stack by forming a mold around the stack, heating the stack and introducing a molten metal into the mold such that the molten metal substantially fills a space defined in the stack that corresponds to the cage. In one form, the space includes slots or related channels formed in the stack that upon filling with the molten metal become longitudinal bars that form electric current loops with end rings of the cage. By heating the stack and maintaining it at a temperature high enough to keep the molten metal in a substantially molten state at least long enough for it to flow through the slots of the stack, premature freezing of the molten metal is avoided. In addition, by providing low pressure to the molten metal in conjunction with the elevated temperature in the stack, flow is promoted to ensure a substantially porosity-free, fully dense squirrel-cage for the rotor.

Abstract: There is disclosed a piezoelectric/electrostrictive body in which a polarization direction of a domain indicates reversible conversion in an electric field and a strain ratio increases, a manufacturing method of the same, and a piezoelectric/electrostrictive element. The piezoelectric/electrostrictive body includes a matrix phase represented by a composition formula ABO3, and an additional, material phase included in the matrix phase, having at least a crystal structure of tetragonal system, represented by a composition formula ABO3 and having a composition different from that of the matrix phase. For example, an alkali-niobate-based material of the tetragonal system, BaTiO3, PZT, PbTiO3, or (Bi0.5, Na0.5)TiO3 is added as an additional material forming the additional material phase to an alkali-niobate-based matrix material forming the matrix phase to form the piezoelectric/electrostrictive body.

Abstract: Provided are stir-welded rotors and methods of making these. An exemplary stir-welded rotor may include a stack of laminations that each has spaced-apart slots arrayed on an outer circumference. The slots register with slot bars that each has a first extremity extending above the stack of laminations and a second extremity extending below the stack of laminations. A first weld extends between first extremities of adjacent slot bars, and a second stir weld extending between adjacent second extremities of adjacent slot bars.

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

Abstract: A method and system for an engine starter/generator is provided. The starter/generator system includes a three phase squirrel cage induction machine, a three phase inverter/converter electrically coupled to the three phase squirrel cage induction machine. The starter/generator system also includes a bidirectional DC-DC converter electrically coupled to the three phase inverter/converter, and a digital control board configured to sensorlessly determine a rotor angle from a plurality of phase currents to the induction machine during a start mode. During the start mode, logic in the digital control board configures the starter/generator system into a combination of an induction motor, a three phase DC-AC inverter, and a DC-DC boost converter, and during a generate mode, the logic in the digital control board configures the starter/generator system into a combination of an induction generator, a three phase AC-DC converter, and a DC-DC buck converter.

Abstract: 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.

Abstract: A cryogenic pumping system for pumping a cryogenic fluid generally includes a rotor having a plurality of slots. The rotor includes at least one endring defining a plurality of openings. Each opening is aligned with a different one of the slots. A plurality of rotor bars are each positioned within a different one of the slots. Each rotor bar includes an end portion received within a different one of the openings and welded to the endring. The cryogenic pumping system can be used to pump a cryogenic fluid from a first location to a second location.

Abstract: A horizontal axis washing machine includes a clothing receptacle rotated by a 4 pole rotor. A 36 slot stator having an interior bore with an interior diameter receives the 4 pole rotor in magnetic coupling relation and capable of operating within a flux weakening range of at least 5:1. The stator has a ratio of an interior diameter to a minimum exterior diameter greater than or equal to 0.63:1.

Abstract: A self magnetizing motor and a compressor having the same is configured to require a lower starting voltage and to deliver superior performance. In the self magnetizing motor, a magnetic material on an exterior of the rotor is magnetized when power is supplied to a magnetizing unit of the stator. A plurality of conductive bars are inserted on the outer circumference of the rotor core. A spacing distance between outer portions of the conductive bars and inner circumference of the magnetizable material is longer than an air gap between the stator and the rotor. As a result, a magnetic strength of the magnetic material may be increased.

Abstract: 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.

Abstract: A rotor for an electric motor according to the invention comprises a substantially cylindrical core, conductive rods and two short-circuit rings. The cylindrical core is formed from a core material and provided with a plurality of longitudinal grooves which extend substantially in the direction of the cylinder axis. The conductive rods are formed from an electrically conductive material and are provided in the longitudinal grooves of the cylindrical core. The two short-circuit rings conductively connect the axial ends of the conductive rods to one another. A diffusion layer extends between the conductive rods and the cylindrical core. The diffusion layer comprises a diffusion material.

Abstract: An electric rotating machine comprises: a stator in which a coil is wound on a plurality of teeth in concentrated winding, and the coil is connected to a three-phase power supply; and a rotor disposed in opposition to the teeth of the stator; wherein a ratio between the number of poles and the number of slots of the stator is 1:3. There is no higher harmonics of magnetomotive force in low order close to fundamental wave, thus enabling efficient operation of the electric rotating machine. Furthermore, owing to the stator of concentrated winding, it is possible to provide an electric rotating machine of high productivity with small coil end, high mass production, and high space factor.

Abstract: The invention provides a rotor for an electrical motor. The rotor comprises both a squirrel cage and a number of magnets and can be inserted e.g. in a line-start motor. To secure the magnets in cavities in a core of the rotor, an end plate is attached to one axial end face by rivet means, and to simplify manufacturing of the rotor, the rivet means forms part of at least one of the short circuit rings of the squirrel cage.

Abstract: A method for building a device having fluidic and electrical functions includes the steps of: mounting a building part with fluidic and electrical functions on a substrate that is provided with a fluidic circuit; fluidically connecting the building part with the substrate; electrically connecting the building part with the substrate; and mechanically connecting the building part with the substrate. Flip-chip technology is utilized and a seal is made by of a gasket. With such a method, a hybrid microfluidic system can be built in which materials and processes for realizing the various connections (fluidic and mechanical and electrical) can be selected in principle independently of each other so the individual processes can be optimized independently of each other in a large measure. With the application of flip-chip technology, great accuracy in the positioning of the building parts can be achieved.

Abstract: The aim of the invention is to achieve a high torque yield in synchronous machines excited by permanent magnets. Said aim is achieved by using subharmonic air gap fields. The rotor comprises an induction cage as well as permanent magnets. The number of winding holes of the stator is greater than q=0.5. The number of poles of the rotor is greater than the base number of poles of the air gap field produced by the windings.

Abstract: A cryogenic pumping system for pumping a cryogenic fluid generally includes a rotor having a plurality of slots. The rotor includes at least one endring defining a plurality of openings. Each opening is aligned with a different one of the slots. A plurality of rotor bars are each positioned within a different one of the slots. Each rotor bar includes an end portion received within a different one of the openings and welded to the endring. The cryogenic pumping system can be used to pump a cryogenic fluid from a first location to a second location.

Abstract: The present invention provides a method for building a component for an electrical rotating machine and comprises: providing powdered magnetic material; providing electrically conductive material; positioning the powdered magnetic material and the electrically conductive material within a mold functional to provide the materials with the required dimensions after application of a hot isostatic pressing (HIP) procedure; and applying at least one HIP procedure to the materials in the mold. Temperatures and pressures of the process are chosen to ensure that the electrically conducting and magnetic portions of the component are bonded without the materials seeping into each other. In one aspect the present invention thus provides a method for building small compact motor systems using motor components formed from pressed powder. A technical advantage of this approach is that the component has uniform grain structure and thus consistent magnetic and structural properties.

Abstract: A rotor for an exciter to be used to energize the field winding of a generator-rotor of a generator, the rotor defining an axis and including at least two conductor bars aligned substantially parallel to the axis. The bars are connected on their first axial end to one of a plurality of collecting ring and on their second axial end individually to one of two rings. By means of at least one diode the flow of current in each bar is allowed in only one direction such that an alternating current induced in the conductor bars due to a static field is converted into a direct current in the two rings.

Abstract: A high strength induction machine, rotor, rotor cage end ring and bar joint, rotor end ring, and related methods are provided. An embodiment of an end ring and bar joint includes a main body adapted to substantially surround a rotor shaft when mounted thereto, a plurality of slots extending inwardly in a radial direction from outer peripheries of the main body, a thicker end ring section extending outwardly from a medial portion of the main body, being thicker than the outer peripheries of the main body, and also being adapted to substantially surround the rotor shaft, and a plurality of bosses extending axially and outwardly from outer peripheral portions in a direction opposite to the thicker end ring section and each adapted to receive an end portion of a rotor bar therein.

Abstract: It is an object to obtain a highly efficient synchronous induction motor by letting the magnetic flux hardly pass in the direction of a q axis without interrupting a magnetic path in the direction of a d axis and by increasing a salient pole difference. A slit next to a shaft 5 is extended towards the shaft along a circumference of the shaft 5 to form an extended part of slit 8a. In addition, a gas vent hole 7 is formed as a slender opening stretched in the direction of d axis, and a slit is projected along the circumference of the gas vent hole 7. Further, the gas vent hole 7 is formed as a slender opening stretched in the direction which is displaced by a predetermined angle from the d axis. Yet further, a rotor iron core 1 is formed by a plurality of rotor iron core portions in the laminating direction, and the rotor iron core portions have different shapes of slits, respectively.

Abstract: A cryogenic pumping system for pumping a cryogenic fluid generally includes a rotor having a plurality of slots. The rotor includes at least one endring defining a plurality of openings. Each opening is aligned with a different one of the slots. A plurality of rotor bars are each positioned within a different one of the slots. Each rotor bar includes an end portion received within a different one of the openings and welded to the endring. The cryogenic pumping system can be used to pump a cryogenic fluid from a first location to a second location.

Abstract: 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.

Abstract: The hybrid induction motor includes a housing; a stator installed in the housing and having a stator core portion and a stator coil portion; a rotor coupling body having a rotary shaft rotatably installed in at the housing, a cage rotor portion rotating integrally with the rotary shaft, and a permanent magnet rotor portion coupled to a circumference of the cage rotor portion with a certain air gap so as to rotate freely with respect to the rotary shaft; and a reverse rotation preventing switch, when the rotary shaft rotates reversibly, coming in contact with the permanent magnet rotor portion which is moved along the shaft by thrust generated by the rotor coupling body and cutting off power being supplied to the stator coil portion.

Abstract: An induction motor having a reverse-rotation preventing function, comprises: a stator provided with a winding coil generating flux by a current; an induction rotor provided with a cage and rotatably inserted in the stator, wherein a rotary shaft is coupled to its inside; a synchronous rotor provided with a permanent magnet and rotatably coupled between the stator and the induction rotor; an induction-force generating unit generating a force for moving the synchronous rotor in an axial direction; and a rotation preventing unit preventing a reverse rotation by fixing the synchronous rotor moved by the induction-force generating unit at the time of reverse rotation of the synchronous rotor.