For an asynchronous machine (1), in particular for use in electric vehicles or hybrid vehicles, comprising a rotor (10) and a stator (20) which surrounds the rotor (10), wherein an external stator yoke (21) with a stator yoke height (h21) is formed on the stator (20) and a large number of radially inwardly projecting stator teeth (22) of the same length are formed on the stator yoke (21), wherein a stator slot (23) is respectively formed between adjacent stator teeth (22), wherein an internal rotor yoke (11) is formed on the rotor (10) and a large number of radially outwardly projecting rotor teeth (12) of the same length are formed by the rotor yoke (11), wherein a rotor slot (13) is respectively formed between adjacent rotor teeth (12), wherein the asynchronous machine is of six-phase design, it is proposed that a total number (N1) of stator slots, which denotes the total number of stator slots (23) formed on the stator (20), is seventy-two.

A method for manufacturing an induction rotor includes placing a lamination stack into a fixture in which the first end of the lamination stack is rotated in an opposite rotational direction from the second end of the lamination stack to skew the conduction bars to an angle . Vertical members are fixed to an outer perimeter of each of the plurality of laminates of the lamination stack. Hoop members are fixed to each of the plurality of vertical members and an outer edge of each of the plurality of conduction bars. A conduction ring is fixed on each of the ends of the lamination stack. An outer perimeter of the lamination stack is machined to remove the plurality of vertical members and the plurality of hoop members from the lamination stack.

A rotor assembly for an electrodynamic machine is provided. The rotor assembly comprises a lamination section and an end connector. The lamination section comprises rotor lamination sheets formed to define an annular array of axial cooling ducts mechanically supported by a plurality of radial and arched structural members that define an array of arched or angled supports to readily pass a magnetic flux via an optimal flux path. The lamination section further comprises rotor slots, with rotor conductor bars being disposed in the rotor slots. The end connector is supported by the rotor conductor bars. An axial space is formed in the lamination section by the annular array of axial cooling ducts for guiding a cooling fluid flow in an axial direction through the rotor assembly.

For an asynchronous machine (1), in particular for use in electric vehicles or hybrid vehicles, comprising a rotor (10) and a stator (20) which surrounds the rotor (10), wherein an external stator yoke (21) with a stator yoke height (h21) is formed on the stator (20) and a large number of radially inwardly projecting stator teeth (22) of the same length are formed on the stator yoke (21), wherein a stator slot (23) is respectively formed between adjacent stator teeth (22), wherein an internal rotor yoke (11) is formed on the rotor (10) and a large number of radially outwardly projecting rotor teeth (12) of the same length are formed by the rotor yoke (11), wherein a rotor slot (13) is respectively formed between adjacent rotor teeth (12), wherein the asynchronous machine is of six-phase design, it is proposed that a total number (N1) of stator slots, which denotes the total number of stator slots (23) formed on the stator (20), is seventy-two.

A method for manufacturing a rotor of a rotary electric machine, including a stack of magnetic laminations defining the slots in which bars made from a first electrically conducting material are received, in which method a second electrically conducting material, different from the first, is injected using an injection machine, from the front of the laminations stack, the bars being held at their rear end against the pressure associated with the injection by a positioning tool that passes through a cavity used for forming a short-circuiting ring at the rear of the laminations stack.

A method for manufacturing a rotor of a rotary electric machine, including a stack of magnetic laminations defining the slots in which bars made from a first electrically conducting material are received, in which method a second electrically conducting material, different from the first, is injected using an injection machine, from the front of the laminations stack, the bars being held at their rear end against the pressure associated with the injection by a positioning tool that passes through a cavity used for forming a short-circuiting ring at the rear of the laminations stack.

A squirrel cage rotor, is made up of a shaft, a rotor laminated core with rotor bars which are arranged in the interior, and short-circuiting rings with clearances through which the bar ends of the rotor bars extend out of the rotor laminated core. The rotor bars, on their surface, at least partially have an electrical insulation layer, wherein the electrical insulation layer is cohesively connected only to the surface of the rotor bars. The squirrel cage rotor is intended, in particular, for use in an asynchronous machine.

A rotor for an asynchronous machine includes a laminated rotor core which is made of a plurality of rotor laminations that are stacked in a longitudinal direction of the rotor, an intended rotational axis of the rotor running in the longitudinal direction; and a rotor cage that has a number of rotor bars, which run through the rotor laminations in the longitudinal direction, and at least one short circuit ring, which is arranged on a laminated rotor core end lying in the longitudinal direction such that the short circuit ring electrically connects the rotor bars together. The laminated rotor core contains at least one rotor lamination in a region at the end. This rotor lamination has a greater strength and/or a greater rigidity in a radial direction with respect to the rotational axis than the other rotor laminations.

A method for manufacturing an induction rotor includes placing a lamination stack into a fixture in which the first end of the lamination stack is rotated in an opposite rotational direction from the second end of the lamination stack to skew the conduction bars to an angle . Vertical members are fixed to an outer perimeter of each of the plurality of laminates of the lamination stack. Hoop members are fixed to each of the plurality of vertical members and an outer edge of each of the plurality of conduction bars. A conduction ring is fixed on each of the ends of the lamination stack. An outer perimeter of the lamination stack is machined to remove the plurality of vertical members and the plurality of hoop members from the lamination stack.

The invention relates to a method for producing a rotor of an electric machine, which rotor is preferably designed as a squirrel-cage rotor. The end rings and/or squirrel-cage bars are produced by means of a metal powder application method. The invention further relates to an end ring for a rotor of an electric machine, said end ring in particular being produced by means of said method.