An induction motor rotor includes a magnetic metal core; and an electrically conductive metal contiguous with the magnetic metal core. The electrically conductive metal includes rotor bars extending along the magnetic metal core and end segments formed onto opposite ends of the rotor bars. Each of the end segments includes a base section extending a first axial distance from the magnetic metal core and a protrusion extending a second axial distance from the magnetic metal core. The second axial distance is greater than the first axial distance. The induction motor rotor also includes a metal ring positioned on an outer circumferential surface of each of the end segments to prevent the end segments from separating from the rotor bars.

A rotor of an aircraft electric motor includes a shaft made of a first material, and a conductive assembly made of a second material different from the first material. The shaft includes a shoulder portion, the shoulder portion includes longitudinal notches. The notches include two contiguous notches radially superimposed in the shoulder portion, a first opening on a radially outer face of the shoulder portion, and a second opening connecting the two contiguous notches. The conductive assembly is a one-piece structure including a conductive bar that is positioned in one notch of the notches, and a skin that is fixed on the shoulder portion.

A motor component prepared by electrolyzing copper and a motor includes an iron core, guide bars, and end rings, wherein the guide bars are arranged in grooves on an outer circumference of the iron core, respectively, and the end rings are located at both ends of the iron core to connect the guide bars in short, the guide bars and the end rings together form an integral squirrel cage, and the guide bars and the end rings are made by a copper electrolyzing method. Thus, manufacturing processes of melting and casting refined copper are omitted, thereby lowering a requirement for energy efficiency of manufacturing process of a motor and achieving energy saving in the manufacturing process; there is no welding process, thereby avoiding welding points resulted from copper welding and improving the reliability of the motor component.

A lamination pack for a motor and method of forming the lamination pack is provided. The method includes inserting a plurality of conductor bars into a plurality of rotor slots defined by a lamination stack such that opposing bar ends of the conductor bars extend from opposing end faces of the lamination stack, skewing the lamination stack and the conductor bars to a skew angle relative to a rotation axis of the lamination stack, and subsequently bending the bar ends of the conductor bars in opposing radial directions to a locking angle greater than the skew angle, to lock each of the conductor bars in its respective rotor slot. The bent bar ends exert a compressive axial locking force on the lamination stack to prevent axial and radial movement of the laminations in the lamination stack and to prevent axial movement of the conductor bars relative to the lamination stack.

A method of manufacturing an induction motor rotor assembly, the method includes the steps of: providing a rotor; machining a plurality of re-entrant slots axially along an outer surface of the rotor; positioning a sleeve concentrically over the outer surface of the rotor; applying a friction stir welding process to the sleeve along each re-entrant slot axially along the outer surface of the rotor to cause the sleeve material to plasticise and flow into the axial re-entrant slot to form an axial re-entrant slot bar; and providing an electrical connection at each of the opposing axial ends of the rotor between respective ones of opposing ends of each of the axial re-entrant slot bars to thereby form the induction motor rotor.

The invention relates to a short-circuiting ring for an electric machine, comprising a single-piece serpentine ring member (7) made of a single-piece strip material. The invention also relates to a rotor for an electric machine.

Rotor of a rotary electric machine, comprising a body having two opposite lateral surfaces and a surface of revolution, two short-circuiting rings disposed in contact with each lateral surface of the body, and conductors disposed in slots formed on the surface of revolution of the body and each connected to the short-circuiting rings, characterised in that each conductor comprises at least one shoulder aligned with a lateral surface of the body.

A rotor of a dynamo-electric rotary machine includes a rotor core arranged concentrically to a rotor axis and including slots filled with electrically conductive material. A front ring is arranged at a front axial end of the slots and includes electrically conductive material, and a rear ring is arranged at a rear axial end of the slots and includes electrically conductive material. A rotor-core-distal surface of the front ring and/or rear ring has a bevel in axial direction from an outer circumference to an inner circumference, with the bevel defined by a bevel angle having a value of 3 to 30. A support element is at least partially connected to the front and/or rear ring with a positive fit and pressed thereon axially, with the support element being supported on a shaft and having a radial end which terminates at a radial end of the front and/or rear ring.

The invention relates to a joint between a copper short-circuiting ring (1) and a copper bar (2) of the damper winding in a permanent magnet synchronous machine, wherein the end of the bar is jointed to a hole (9) disposed in the short-circuiting ring by welding them together at the mating surfaces. Further, the invention relates to a corresponding method. According to the invention the short-circuiting ring (1) includes a blocking structure for limiting the heat flux from being conducted further into the short-circuiting ring from the weld between the short-circuiting ring and the bar.

A cage rotor of an asynchronous machine includes radially closed or partially opened slot recesses. Arranged in the slot recesses are conductor bars which are fixed in the slot recesses by a metal foam. The slot recesses can be produced by punching individual sheet metals which are then stacked to form a laminated core. A short-circuit ring can be attached at one end face of the laminated core to contact the conductor bars.