Abstract: A counter-rotating motor and a high speed blender is described. The counter-rotating motor includes a stator, an inverter, an inner rotor and an outer rotor, the stator is provided with an outer winding and an inner winding, and the outer winding and the inner winding have opposite phase sequences, the inverter is connected in parallel with the outer winding and the inner winding to synchronously supply excitation current to the outer winding and the inner winding, the inner rotor is provided in the inner winding and is used for rotating in a first direction under the effect of the inner winding, and the outer rotor is provided in the outer winding and is used for rotating in a second direction opposite to the first direction under the effect of the outer winding.

Abstract: A rotor for a bearingless induction motor is provided. A rotor core defines rotor slots. A rotor winding includes a common connector plate, a plurality of rotor connector plates, and a slot conductor mounted within each rotor slot. The common connector plate is mounted adjacent a first end of the rotor core. The plurality of rotor connector plates is mounted adjacent a second end of the rotor core. Each slot conductor is electrically connected to the common connector plate and to one rotor connector plate of the plurality of rotor connector plates. Each rotor connector plate of the plurality of rotor connector plates is configured to connect a group of slot conductors that includes at least two slot conductors. A number of slot conductors included in the group of slot conductors is defined based on a predefined number of suspension pole pairs selected to provide a radial suspension force.

Abstract: An electric machine assembly includes a rotor formed from one or more magnetically conductive sheets having elongated magnetic flux barriers separated from each other in radial directions that radially extend away from an axis of rotation of the rotor. The magnetic flux barriers are separated from each other by magnetic flux carrier portions of the one or more magnetically conductive sheets. The assembly also includes a non-magnetic post coupled with the magnetic flux carrier portions of the one or more magnetically conductive sheets on opposite sides of at least one of the magnetic flux barriers. The non-magnetic post is elongated in the radial directions from a first magnetic flux carrier portion to a second magnetic flux carrier portion of the magnetic flux carrier portions on the opposite sides of the at least one magnetic flux barrier.

Abstract: A rotating electric machine includes a case, a stator, a first rotary member including a rotor core and a first shaft, a second rotary member including a second shaft, and a multiple disc clutch. A first oil passage and a second oil passage are provided inside the case. The first oil passage starts from an inside of the first shaft or an inside of the second shaft, passes through the multiple disc clutch from an inner side to an outer side in a radial direction with respect to a rotation center, and reaches an inner side of the rotor core in the radial direction. The second oil passage starts from the inside of the first shaft or the inside of the second shaft and reaches the inner side of the rotor core in the radial direction without passing through the multiple disc clutch.

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

Abstract: 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.

Abstract: 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.

Abstract: 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.

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 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.

Abstract: 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.

Abstract: 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.

Abstract: The main problem to be solved by the invention is to provide a superconductive rotor, a superconductive rotating machine and a superconductive rotating-machine system which are capable of inductive and synchronous rotation while employing the induction machine configuration and also offer satisfactory heat dissipation performance, stability under an excessive load, and easy magnetic flux trap for synchronous rotation. To solve the problem, the invention provides a superconductive rotor, as shown in FIG.

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: The present invention relates to an induction motor having multi-stage rotors arranged concentrically and being usable as a generator. More particularly, the present invention relates to an induction motor, which includes a core having conductive bars arranged in multi stages and coils arranged in multi stages, and which is usable as a generator. The present invention may be applied to a hub type, in which a shaft is fixed and a housing of the induction motor is rotated, and a rotation type, in which the housing is fixed and the shaft is rotated. According to one aspect of the present invention, the induction motor according to the present invention includes a rotor and a stator.

Abstract: A continuously variable transmission ratio device with optimized system efficiency by maximizing power flows through the primary power flow paths. The device is constructed from more than one fixed gear ratio device and controlled via a variator that is connected between the fixed gear ratio devices. The construction and operation of the continuously variable transmission ratio device is such that it provides a wide range of speed ratios between connected input and output devices and optimized system efficiency subject to constraints on the power flow through the variator. This continuously variable transmission ratio device can be used effectively in energy generation applications where optimized system efficiency entails coupling input and output devices with varying speed ratios for optimal component efficiency.

Abstract: A rotor assembly comprising: an inner rotor and an outer rotor for rotating in a magnetic field of a motor, the inner rotor comprising a main inner rotor cavity, and a plurality of first holes being formed between the inner rotor and the outer rotor; two side boards, each side board having a main side board cavity, and being perforated by a plurality of second holes; two damping elements each damping element comprising a main damping element cavity; a plurality of rubber sleeves, each rubber sleeve having a rubber sleeve lip; and a plurality of third holes; an axle; and a plurality of positioning pins.

Abstract: A rotor includes: a magnet having a circular cylinder shape and having a hole formed through its axial center, wherein the hole has in axial cross section a regular polygonal shape having flat portions and angle portions, and wherein a recess having a truncated cone shape is disposed at an axial end of the magnet such that the recess has its maximum diameter portion located at the axial end and has its minimum diameter portion communicating with the hole; and a shaft fitted in the hole of the magnet, wherein the outer circumference of the shaft makes contact with the flat portions of the hole of the magnet thereby forming a plurality of gaps between the outer circumference of the shaft and the angle portions of the hole of the magnet, and adhesive is filled in the gaps.

Abstract: An ignition/fuel injection system adapted with an auxiliary power source to exclusively supply power needed for the operation of the system, and a separation charging power source to separate that from the batteries for starting the motor so to avoid affecting the normal start-up of an engine by the sudden drop of the working voltage of the ignition/fuel injection system while the voltage of the batteries significantly drops as greater amperage is required to start the motor during the start-up of the engine; or to provide normal working voltage to the ignition/fuel injection system to ensure of good ignition status in case of lower engine rpm and insufficient voltage of generator in case of an engine started manually without the installations of motor and batteries.

Abstract: A synchronous machine (10), in particular, for a starter-generator of an internal combustion engine, includes a stator, a rotor (22) having a rotor shaft (24), a stack of sheets (28), and squirrel cage (30) non-rotatably connected with the rotor shaft (24) and the stack of sheets (28). The squirrel cage (30) has a short circuit ring (36) on its opposite front ends, which is secured to an annular reinforcement element (40, 42). The reinforcement elements (40, 42) do not overlap adjacent, outer circumferential surfaces of the squirrel cage (32) or the short circuit rings (36).

Abstract: A rotor assembly comprising: a circular iron core having a top and bottom side spaced from each other; extruded aluminum bars inserted into and around the circumference of the circular iron core; and a pair of extruded circular end rings attached to the top and bottom of the iron core. The circular end rings are configured to have a plurality of openings configured to align with and receive a portion of the extruded aluminum bars when they are inserted into the iron core. A manufacturing process for manufacturing the rotor assembly is also described.

Abstract: A brushless doubly-fed induction machine comprising dual cage rotors, suitable for use in generator applications requiring a fixed-frequency electrical output that is independent of a rotational speed at which the machine is driven or motor applications requiring limited variable speed operation when connected to an AC mains. Various embodiments are disclosed, but each includes a stator frame in which first and second annular stators are mounted spaced-apart, end-to-end along a common axis. Each annular stator includes a core wound with polyphase distributed windings defining a plurality of poles. First and second rotors, mounted on a common shaft, are disposed within the first and second annular stators, respectively. Each of the rotors includes a laminated core having a plurality of longitudinally-extending slots defined around a periphery thereof, and at least one conductor is disposed in each slot.

Abstract: A rotor assembly for an induction motor has cast end rings located at each axial end of a magnetically permeable core. The end rings electrically connect conductor bars extending through conductor channels in the core to provide a squirrel cage arrangement. The end rings are configured to define an annular peak along which a plurality of mounting sprews are located. Preferably, the mounting sprews are positioned between adjacent pairs of radial fan blades. The annular peak may be formed by a tapered structure which advantageously provides a narrower end ring width near the rotor's outer diameter surface. The reduced width at this location presents a higher resistance in the lock rotor condition, thus yielding an improved lock rotor specification in many cases. Due to the "deep bar effect," current will flow through the thicker portion of the end rings at higher operating speeds (i.e., lower slip frequency). As a result, a lower resistance will be realized as the motor is brought up to speed.

Abstract: The present invention relates to a squirrel-cage induction motor for frequency converter use, in particular, which squirrel-cage induction motor comprises a stator, a stator winding arranged in its axial grooves, divided into at least two coil groups for each phase of the supplying alternating current and connected to the supplying alternating current in such a manner that the sum of basic frequency groove currents is substantially zero at each moment. In accordance with the invention, one half of the coil groups of each phase is connected to the supplying alternating current at one end of the stator and the other half of the coil groups of each phase at the other end of the stator.

Abstract: A rotor for an induction motor of the squirrel cage type wherein the rotor bars are exposed to a resilient anti-sparking compound in the rotor slots of the machine. The rotor bars are provided with a longitudinal slot to permit the insertion of the anti-sparking compound after assembly of the squirrel cage rotor. Alternatively, the laminations may be shaped to produce a longitudinal groove in the rotor bar slot to permit the insertion of the anti-sparking compound in the groove so produced. Of course, both the rotor bar and the rotor slot may both be provided with complimentary slots adjacent one another in which the anti-sparking compound may be injected.

Abstract: A squirrel cage type electric motor rotor assembly includes first and sec end plates of circular configuration, rigid tubes extending from the first plate to the second plate, the tubes being closed at either end thereof to define enclosed chambers therein, and granules of magnetic material disposed in the chambers, the granules being packed therein with a density leaving them readily movable to align with magnetic fields.

Abstract: A high-frequency motor comprises a squirrel-cage rotor. The rotor comprises an iron core having a plurality of circular slots, a plurality of conductive rods inserted into the slots, and short-circuit rings disposed at both ends of the conductive rods. The conductive rods are made of copper. A ratio of a product of the number N2 of the conductive rods and a diameter d2 of each conductive rod to an outer diameter D of the rotor is in an optimized range of 1.1 to 1.5, namely, 1.1.ltoreq.N2.multidot.d2/D.ltoreq.1.5. With this optimization, it becomes possible to achieve a maximum rotational speed of more than 120,000 min.sup.-1 and obtain an excellent motor efficiency.

Abstract: The present invention is applicable to any a.c. electromagnetic reduction device which is used to change voltage or current levels or to transfer energy between mechanical and electrical systems and includes, for each phase, a combined pair of windings which are conductively and inductively dependent. The dominant winding of each combined pair is electrically connected to an input/output phase, while the reflux winding of each pair is electrically connected in additive or subtractive series with the dominant winding by means of a variable capacitive reactance. The capacitive reactance is then adjusted to minimize the net reactive factor of the coupled windings and the net reflected impedance of the input/output circuitry.

Abstract: An induction synchronous motor includes a unitary rotor having first and second pole type rotor cores, first and second stators, a voltage phase shifting means, and DC magnetic excitation circuits. Both of the rotor cores are mounted on a common rotor axis with a predetermined space between them. The first and second rotor windings are wound on the first and second rotor cores, respectively. A plurality of diodes is each connected in parallel between series-connection nodes of the first and second rotor windings. A plurality of rotor conductors is provided on the peripheries of and extend through the first and second rotor cores. A pair of short-circuit rings short-circuits both ends of the plurality of rotor conductors. The first and second stators surround the first and second salient pole type rotor cores, respectively, and have the same number of poles as the first and second rotor cores. The voltage phase shifting means selectively produces a phase difference of 0.degree.

Abstract: A squirrel-cage rotor includes a rotor core composed of steel sheets. Each steel sheet has in the outer circumference a number of slot-forming punched portions along the outer circumference thereof, each punched portion including a main portion and an additional portion inclined toward one of two sides along the outer circumference of the rotor relative to the position of the main portion, such that each punched portion has an unsymmetrical shape. The units include those formed by laminating the steel sheets having the respective additional portions inclined in the direrction of one side, and those formed by laminating the steel sheets having the respective additional portions inclined toward the other side. Slots are formed so as to be parallel with the rotor axis.

Abstract: A modification of the squirrel cage of an alternating current motor reduces the starting current amperage. A conventional motor squirrel cage, which includes rotor bars and shorting rings, is modified so that the cage may have two or more controllable resistance values by segmenting the shorting rings. A high resistance cage is obtained for initial motor starting when the open segmented shorting rings provide a high resistance path within the squirrel cage circuit. Subsequent to the motor's attaining full rotation speed, a low resistance value of the squirrel cage is achieved by shunting the segmented shorting rings, which gives the motor its optimum running efficiency. In one embodiment, a mechanical means is used to accomplish the shunting of the shorting rings. In a second embodiment, a solid state control device is used to accomplish the shunting of the shorting rings.

Abstract: An electromagnetic torque transmission structure for transmitting torque from one shaft to a second aligned shaft, the structure including an excitation-rotor attached to a first shaft, an induction-rotor attached to a second shaft, and a magnetic field-exciter. An inner pole, an outer pole and a pole-connecter of the excitation-rotor surround the inner and outer surfaces and one end of the hollow induction-rotor cylinder. At least an inner or outer pole includes field concentrators. A stationary winding with magnetic circuitry provides an excitation field associated with the excitation-rotor. Magnetic fields from induced currents in the induction-rotor react with fields from the excitation-rotor to provide torque transmission between shafts.

Abstract: An induction-motor structure having a synchronous-rotor and an induction-rotor in which inner- and outer-synchronous-rotor poles and a synchronous-rotor-pole connector surround the inner-cylindrical surface of the hollow cylindrical induction rotor, the outer-cylindrical surface of a hollow cylindrical stator core having alternating-current windings and surround the ends of that induction rotor and that core. At least one of the rotor poles includes magnetic field concentrators. A stationary field winding mounted on the end of the stator may be used adjust power factor.

Abstract: An induction motor having a stator with a stator winding, and a rotor coupled with a shaft 10 and separated from the stator by an air gap 13, wherein the rotor includes a current conducting element 5,15 and a magnetically excitable member 4, and in the air gap 13 formed between the stator and the magnetically excitable member 4, a rotary element 6 is arranged, made from a permanent magnetic material and supported freely running with respect to the rotor.

Abstract: A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator being driven by a shaft coupled to the motive power source and power converters mounted on the shaft to transfer power between the exciter and the main generator. At shaft speeds below synchronous speed, i.e. that speed which would produce the desired output frequency when DC power is coupled to the main generator field windings, the exciter output is rectified and inverted so that alternating current power of proper frequency is delivered to the field windings of the main generator to maintain the output of the generator at a constant frequency. At synchronous speed, the power converters transfer substantially only DC power to the main generator windings.

Abstract: A self-cascaded reluctance motor is provided with an axially laminated rotor. The motor includes a stator winding having two sets of terminals and wound such that the number of poles between one set of terminals differs from the number of poles between the other set of terminals by more than two. The rotor includes a plurality of axially disposed conductive sheets and magnetic material laminations which are interleaved within each rotor segment to form groups of magnetic material laminations which lie between two of the conductive sheets. The number of conductive laminations is equal to one half of the total number of stator winding poles or an integral submultiple thereof, while the number of groups of magnetic material laminations is equal to one half of the total number of stator pole pairs or an integral submultiple thereof. Short-circuited coils can be substituted for the conductive sheets to provide better coupling between the two stator component windings and thus more output power.

Abstract: A squirrel-cage rotor for an induction motor is disclosed. In this rotor, each of end rings electrically connecting the associated ends of the conductor bars received in the slots of the rotor core comprises a first ring portion disposed in contact with the associated end face of the rotor core, and a second ring portion disposed on or coupled to the first ring portion through a member of a magnetic material in the axial direction of the motor, this second ring portion having a sectional area smaller than that of the first ring portion when the section is taken in a direction orthogonal with respect to the axis of the motor.

Abstract: Variable-speed electric induction motors are known with a closed fluid-flow circuit for coolant liquid driven by a pump operated by the motor. A disadvantage is that the coolant flow varies with speed of the motor. The improvement is that the motor has an ancillary shaft which drives the coolant pump and which is rotated at constant speed irrespective of the speed of the main drive rotor of the motor. The ancillary shaft may be driven by an ancillary rotor cooperating with the main stator of the motor. There may also be provided a coolant fan driven at constant speed, for example by the ancillary shaft and preferably through a releasable clutch.

Abstract: The disclosure is of a variable speed three-phase motor with a intermediate rotor and inner rotor, where the pack of laminations of the main rotor is prolonged as an annular pack of laminations in the direction of the longitudinal axis with short-circuit rods extending over the whole length of the stator, thereby forming an annular intermediate rotor inside which the inner rotor with its short-circuit rods rotates.