The invention relates to a squirrel-cage rotor of an asynchronous machine (1), comprising conductors (9) in grooves (12) of a magnetic field-conducting rotor, and electrically conducting rotor end rings (6) which are located in the region of the end faces of the magnetic field-conducting rotor, electrically connect the conductors (9) and have at least two materials that conduct electricity differently.

An asynchronous starting and synchronous reluctance electric motor rotor, an electric motor and a compressor. The asynchronous starting and synchronous reluctance electric motor rotor includes a rotor core. The rotor core includes: a first magnetic barrier structure, with multiple groups of first magnetic barrier portions arranged at interval along a d-axis of the rotor core; and a second magnetic barrier structure, including two communicating magnetic barrier slots arranged at interval along the d-axis, the two communicating magnetic barrier slots being respectively located on two sides of the first magnetic barrier structure, the communicating magnetic barrier slots being arc-shaped slots extending circumferentially along the rotor core, and slot walls of two ends of the arc-shaped slots being arranged parallel to a q-axis.

A method for producing a rotor for an electric rotating machine includes spraying in a rolling manner a first metallic material and a second metallic material, which is different from the first metallic material, onto at least part of a substantially cylindrical outer surface of a shaft body by a thermal spraying method to form on the shaft body a coating which forms at least part of a squirrel cage.

Provided is a rotor for an asynchronous rotary electrical machine with non-through shaft that includes a cylindrical magnetic mass gripped between two mounting flanges of two half-shafts, a cooling means capable of cooling the rotor and conductive bars housed within the magnetic mass and distributed substantially uniformly over a diameter of the magnetic mass. The cooling means includes, for each conductive bar, at least one cooling channel, opening onto the conductive bar according to an axial direction and located within the magnetic mass and at least one through hole arranged within each conductive bar in such a way that the cooling channel communicates with at least one hole arranged on the outer periphery of the magnetic mass.

Provided is a rotor for an asynchronous rotary electrical machine with non-through shaft that includes a cylindrical magnetic mass gripped between two mounting flanges of two half-shafts, a cooling means capable of cooling the rotor and conductive bars housed within the magnetic mass and distributed substantially uniformly over a diameter of the magnetic mass. The cooling means includes, for each conductive bar, at least one cooling channel, opening onto the conductive bar according to an axial direction and located within the magnetic mass and at least one through hole arranged within each conductive bar in such a way that the cooling channel communicates with at least one hole arranged on the outer periphery of the magnetic mass.

The invention relates to an energy efficient induction motor (100) comprising a stator (102), a main winding (M) of the stator (102) for generating a rotating magnetic field (RMF) (108), and a rotor (104) disposed to rotate relative to the main winding (M) of the stator (102) due to the RMF (108). The stator (102) comprises additional winding(s) (A) for producing an alternating EMF (110) which is induced in the one or more additional windings (A) due to the rotation of the rotor (104). The alternating EMF (110) produced in the one or more additional windings (A) is fed back simultaneously to the main winding (M) of the stator (102) throughout the complete rotation cycle of the rotor (104) through an electronic control unit (112) coupled to the stator (102), producing a resultant AC output power (116) that is fed continuously to the main winding (M) of the stator (102).

A method and system for sensorless determination of the orientation of the rotor of an ironless PMSM motor from a known rotor angle is described. The method and system include: specifying a rotor system according to the rotor angle; applying voltage pulses to the phases of the motor in the torque-forming direction of the rotor system; measuring the current in the phases of the motor; determining the expected back EMF along the flux-forming axis, based on the measured current; forming an integral of the expected back EMF by time integration of the expected back EMF along the flux-forming axis and/or a filter-based accumulation function; and determining the orientation of the rotor from the algebraic sign of the integral of the expected back EMF and/or the accumulation function.

Various embodiments may include a rotor for an electric machine, the rotor comprising: a first shaft journal; a second shaft journal; a laminated rotor core; a filler body cast onto the laminated rotor core wherein the filler body and the laminated rotor core rotate conjointly; and a cooling duct extending through the shaft journals and the filler body along an axis of the filler body and the rotor core. The filler body rotates with the shaft journals and a torque applied to the shaft journals is transmitted to the laminated rotor core.

The rotor (4) for a squirrel-cage asynchronous rotating electrical machine comprises two compaction elements (6) clamping a cylindrical magnetic mass (7), short-circuit disks (8) inserted between the magnetic mass and the compaction elements, and conductive bars (9) housed in housings (10) of the magnetic mass and evenly distributed over at least one diameter of the magnetic mass, so that the short-circuit disks and the conductive bars form a squirrel-cage, at least one of the compaction elements and the short-circuit disks comprising insertion holes (Sa, 12) each disposed facing a housing. Retention means are inserted into each insertion hole to retain the conductive bars in the housings.

An electric drive comprises a bearingless electric machine, a converter, and a control device. The stator of the electric machine has a cage winding including bars connected to a conductor ring. The control device controls the converter to supply torque generating current components to the bars so that torque is generated in accordance with electric machine control and to supply levitation current components to the bars so that the rotor of the bearingless electric machine is levitated in accordance with levitation control. The cage winding allows the currents of the bars to be controlled so that different current sheet distributions can be generated so as to generate desired torque and magnetic force.