EP-4740291-A1 - VIBRATION REDUCTION BY PREVENTING RADIAL SHIFTING OF ROTOR MODULES

Abstract

A rotor is designed for use in an electric machine and has a shaft on which a plurality of rotor components (16) is arranged. The individual rotor components (16) are positioned axially adjacent to one another and have a receptacle (24) for the shaft. A means (20) for preventing or reducing a relative movement between at least two adjacent rotor components (16) is provided on at least one axial end wall (22) of a rotor component (16).

Inventors

• FISCHER, DANIEL
• WEIGAND, ANDREAS
• HOFMANN, THOMAS

Assignees

• Schaeffler Technologies AG & Co. KG

Dates

Publication Date

20260513

Application Date

20240701

Claims (1)

1. patent claims 1. Rotor (10) for an electrical machine, comprising a shaft (12) on which a plurality of rotor components (16) are arranged, wherein the rotor components (16) are positioned axially adjacent to one another, characterized in that at least one means (22) for preventing or reducing a relative movement between at least two adjacent rotor components (16) is provided on at least one axial end wall (22) of at least one rotor component (16). 2. Rotor (10) according to claim 1, characterized in that the at least one means (22) comprises hard particles (26) for increasing the friction between at least two adjacent rotor components (16). 3. Rotor (10) according to claim 2, characterized in that the at least one means (22) comprises a disk body (14) arranged on the shaft (12) and between two rotor components (16) and provided with hard particles (26) on at least one axial end wall (30). 4. Rotor (10) according to claim 2 or 3, characterized in that the at least one means (22) comprises a textile carrier (28) arranged on the shaft (12) and between two rotor components (16) and provided with hard particles (26) on at least one axial end wall (30). 5. Rotor (10) according to one of claims 2 to 4, characterized in that the at least one means (22) comprises a coating comprising hard particles (26) on at least one axial end wall (22) of a rotor component (16). 6. Rotor (10) according to one of claims 2 to 5, characterized in that the hard particles (26) are selected from boron nitride particles, diamond particles, silicon carbide particles. 7. Rotor (10) according to one of claims 1 to 6, characterized in that the at least one means (22) comprises a tensioning means for increasing the contact tension of adjacent rotor components (16). 8. Rotor (10) according to one of claims 1 to 7, characterized in that the at least one means (22) comprises an axial material connection of at least two adjacent rotor components (16). 9. Rotor (10) according to claim 8, characterized in that at least one means (22) is provided for preventing or reducing a relative movement between all rotor components (16). 10. Electrical machine, comprising an arrangement of a rotor (10) and a stator, characterized in that the rotor (10) is designed according to one of claims 1 to 9.

Description

Description VIBRATION REDUCTION BY PREVENTING RADIAL MOVEMENT OF ROTOR MODULES The present invention relates to a rotor for an electrical machine. The present invention particularly relates to a rotor for an electrical machine which has low noise and vibration emissions during operation. The present invention further relates to an electrical machine which has such a rotor. Electric motors are becoming more and more of a focus in mobility. Electric motors, also known as electric machines, are often made up of a rotor and stator arrangement. The rotor often has a rotor package designed as a laminated core. When the electric machine is in operation, the laminated cores are excited to vibrate via the electromagnetic tooth forces. These vibrations form both over the circumference and over the axial length. Ultimately, these vibrations are transmitted to the housing and the air and perceived as noise, which is generally perceived as disturbing. There is a constant need to reduce the noise pollution emitted by a rotor or, in general, by an electrical machine. The solutions from the state of the art can thus be further improved, in particular with regard to low-noise and low-vibration operation of an electrical machine. It is therefore the object of the present invention to provide a solution by means of which at least one disadvantage of the prior art can be at least partially overcome. It is in particular an object of the present invention to provide a solution by means of which the noise and/or vibration load emanating from an electrical machine can be reduced. The solution to the problem is achieved by a rotor for an electrical machine with the features of claim 1. The solution to the problem is further achieved by an electrical machine with the features of claim 10. Preferred embodiments of the invention are described in the subclaims, in the description or in the figures, with further embodiments being described in the subclaims or in the Features described or shown in the description or in the figures, individually or in any combination, may constitute an object of the invention, unless the context clearly indicates otherwise. A rotor for an electrical machine is described, comprising a shaft on which a plurality of rotor components are arranged, wherein the rotor components are positioned axially adjacent to one another, wherein at least one means for preventing or reducing a relative movement between at least two adjacent rotor components is provided on at least one axial end wall of at least one rotor component. Such a rotor has significant advantages over state-of-the-art solutions, particularly with regard to reduced noise and/or vibration emissions. The rotor described here is part of a stator-rotor arrangement which is part of an electrical machine or an electric motor. In a manner known per se, the rotor is driven by the stator in order to drive, for example, a shaft or a wheel of a motor vehicle. Accordingly, the rotor is set in rotation, which can lead to noise emissions. To prevent this or at least reduce it, the rotor is constructed as described below. The rotor comprises a shaft on which a plurality of rotor components are arranged. In principle, the rotor components can be freely selected and can include, for example, a fan wheel, a compensating wheel or other attachments of the rotor located on the shaft, such as a rotor component. However, the rotor components preferably comprise one or more of the rotor packages, also referred to as stacks, and/or their attachments. Existing rotor packages can basically be designed as is known to those skilled in the art from electrical machines. In particular, the rotor packages can be designed as laminated cores. The rotor components are usually pressed onto the shaft and positioned in such a way that the rotor components are positioned axially adjacent to one another. For example, the rotor components can touch axially, form a particularly small gap between them or one or more Intermediate elements may be provided axially between two rotor components, as described below. According to the invention, a means for preventing or reducing a relative movement of at least two adjacent rotor components to one another is provided on at least one axial end wall of at least one rotor component, i.e. a rotor component located on the shaft. An axial end wall is to be understood in particular as meaning that this wall is a wall arranged on an axial end region and arranged in a radially extending plane, which corresponds approximately to the base area of a cylinder. A relative movement of the rotor components to one another can result in particular from the fact that when the rotor components are pressed onto a shaft, no axial force remains between the rotor components. This basically enables a relative rotational or axial movement between the rotor components. Because according to the invention appropriate means are provided which reduce or completely prevent relative