Squirrel-cage Rotor And Method For Producing Such A Squirrel-cage Rotor

Abstract

The invention relates to a squirrel-cage rotor (1) and a method for producing such a squirrel-cage rotor, which comprises a rotor shaft (100 having a solid rotor section (11) composed of ferromagnetic material, which solid rotor section has a plurality of through-passages (12) that extend in an axial direction of the rotor shaft, a plurality of electrically conductive rod elements (20), which are each accommodated in one of the through-passages (12) so that the rod elements (20) extend through the solid rotor section (11) in the axial direction, wherein the rod elements (20) each have a first longitudinal end (20a) and a second longitudinal end (20b) facing away from the first longitudinal end, and two electrically conductive end elements (30, 40), which electrically connect the first longitudinal ends (20a) to each other and the second longitudinal ends (20b); to each other so that a squirrel-cage is formed by the rod elements (20) and the end elements (30, 40). The rod elements (20) are accommodated in the through-passages (12) in such a way that a relative motion in the axial direction of the rotor shaft (10) between the solid rotor section (11) and the rod elements (20) is enabled in the event of a length change of the rod elements (20) and / or of the solid rotor section (11).

Description

technical field [0001] The invention relates to a partially short-circuited rotor according to the preamble of claim 1 , also known as a squirrel-cage rotor, and to a method for producing such a short-circuited rotor. Background technique [0002] Rotors for electric motors that are laminated, ie constructed from a number of individual ferromagnetic plates, are known. [0003] For use at very high rotational speeds and / or in polluted, corrosive or uncontrolled environments, however, this stacked design may violate physical limits or become completely impermissible. [0004] The application of a one-piece, solid rotating part or rotor (solid rotor) made of ferromagnetic material can provide the desired solution here, because the structural form has the advantages of mechanical strength, rotor dynamic stability, simple Significant advantages are shown in terms of a substantial reduction of structures and components. [0005] Different designs of solid rotors are realized and...

AI Technical Summary

Problems solved by technology

As a result, during the heating of the short-circuit rotor, since the conductor bars generally consist of a different material than the solid rotor section and thus have different thermal expansion properties, the entire short-circuit rotor can be deformed, which can lead to imbalances or even fractures

[0008] This can lead to a reduction in the service life of the short-circuited rotor and thus to premature failure of the electric motor equipped in this way

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