A rotor for an asynchronous machine has a laminated core and a short-circuit cage at least partially integrated in the laminated core. The short-circuit cage is designed with rods having or consisting of a first electrically conductive material and short-circuit rings having or consisting of a second electrically conductive material. At least one of the short-circuit rings is designed with a support ring, and each support ring is designed as a structure interlockingly and/or integrally cast onto or into the associated short-circuit ring.

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

A rotor for an asynchronous machine includes a laminated core and a short-circuit cage at least partially integrated in the laminated core. The short-circuit cage is designed with rods having or consisting of a first electrically conductive material and with short-circuit rings having or consisting of a second electrically conductive material. The short-circuit rings are indirectly or directly frictionally welded to the rods.

An induction motor is disclosed. The induction motor comprises a stator body assembly. The stator body assembly is characterized by a hollow cylindrical stator stack and a set of intertwined stator rods. The hollow cylindrical stator stack is fabricated with a plurality of rectangular shaped open slots on inner surface periphery and a plurality of cleating notches on outer surface periphery. The induction motor also comprises a rotor body assembly. The rotor body assembly is housed within the stator body assembly and configured to mount over multi-step shaft of the induction motor. The rotor body assembly is characterized by a hollow cylindrical rotor stack fabricated with a plurality of predesigned rotor slots on outer surface periphery, a plurality of vent holes and a notch on inner surface periphery. The rotor body assembly is also characterized by a set of rotor bars, housed within the plurality of predesigned rotor slots.

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

A cage rotor for an asynchronous machine is provided. The cage rotor includes a laminated rotor core made of a plurality of stacked rotor laminations, which each have a plurality of rotor lamination grooves distributed in the circumferential direction. The cage rotor also includes short-circuit rings which are provided on both sides of the laminated rotor core and which each have a plurality of short circuit ring grooves distributed in the circumferential direction, and short-circuit bars which are inserted in the rotor lamination grooves, which extend through the short circuit ring grooves and the ends of which project beyond the short circuit rings. The short circuit ring grooves are open radially outwards and the short circuit bars with the short circuit rings are connected to each other at the side of the short circuit grooves which is at least partially open radially outwards. A method for producing such a cage rotor is also provided.

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

A rotor for an electrical machine with one or a plurality of cooling ducts through which a cooling agent can flow. One end face of the rotor there is provided an annular space, bounded axially inwardly and radially outwardly and joined communicating with the cooling duct or ducts. A cover plate is provided, attached to the end face and bounding the annular space axially outwardly, having a central through-opening for introducing the cooling agent into the annular space.

A rotor casting includes a lamination stack and a cast structure including proximal and distal cast end rings respectively adjacent proximal and distal end faces of the lamination stack. Cast axial ribs are distributed radially on a peripheral surface of the lamination stack and extend between the proximal and distal cast end rings. Cast feed members extend axially from the proximal cast end ring and are respectively positioned radially between an adjacent pair of axial ribs. In one example, cast bar segments integral to the proximal and distal cast end rings are formed in axial slots of the lamination stack. In one example, a bar insert in each axial slot has insert ends that extend respectively from the proximal and distal end faces of the lamination stack and are fully encapsulated respectively in the proximal and distal cast end rings. A method of forming the rotor casting is provided.

There is a growing need for line-start single-phase electric motors that provide in combination high starting torque, high efficiency and low acoustic signature, particularly for use in hermetically sealed devices including, but not limited to, reciprocating piston systems for power generation and gas compression. This disclosure provides is a single-phase induction machine that meets this need.