Rotor assembly for electric machine and method for producing rotor assembly

Abstract

The invention relates to a rotor assembly (RA1, RA2) for an electric machine (EM), comprising a rotor (RT1, RT2) having an axis of rotation (DA1, DA2) extending in an axial direction of the rotor (RT1, RT2) and at least one first hole (AN11, AN12, AN21, AN21´, AN3) extending parallel to the axis of rotation (DA1, DA2) and radially spaced from the axis of rotation (DA1, DA2) by a first radial distance (A1, A21), and at least one first balancing element (WE1, WE21, WE3) for compensating an unbalance of the rotor (RT1, RT2) in rotation about the axis of rotation (DA1, DA2), wherein the at least one first balancing element (WE1, WE21, WE3) can be provided in the at least one first hole (AN11, AN12, AN21, AN21´, AN3) and can be fastened in the at least one first hole (AN11, AN12, AN21, AN21´, AN3) by means of a press fitting connection (PV) between the at least one first hole (AN11, AN12, AN21, AN21´, AN3) and the at least one first balancing element (WE1, WE21, WE3). Thus, a simple and economical possibility of balancing the rotor is provided.

Description

technical field [0001] The invention relates to a rotor assembly for an electric machine (or electric motor) and a method for producing the rotor assembly. Furthermore, the invention includes an electric machine having such a rotor assembly. Background technique [0002] Electric machines, especially those used to drive hybrid or electric vehicles, typically have a rotor that can often be accelerated to rotational speeds above 15,000 rpm (revolutions per minute) during operation of the electric machine. [0003] If a rotor rotating at such speeds becomes unbalanced, especially if the mass of the rotor is asymmetric about the axis of rotation of the rotor, this can lead to undesirable vibrations and increased wear on the motor. [0004] Therefore, in such machines, it is absolutely necessary to perform rotor balancing in order to reduce or avoid vibration or wear on the machine. [0005] It is conceivable to balance the rotor by selectively removing or adding weight materia...

AI Technical Summary

Problems solved by technology

It shows that this solution for balancing the rotor has the disadvantage that the rotor has to be provided before the additional weight material is selectively removed later, which overall results in a relatively heavy rotor weight and thus also in the electrical machine. high moment of inertia

[0007] Alternative, conceivable solutions for balancing rotors are very difficult and expensive for standardized or automated production processes by selectively adding weight material (for example by applying balancing paste to the rotor)

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