Electric machine comprising a housing
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Solution Overview
Problem
Existing electric machines face challenges in achieving optimal vibration characteristics and alignment between main modules, leading to inefficient force transmission and potential vibration transfer from the stator to the housing, which can result in suboptimal operation and non-compliance with vibration standards.
Innovation Solution
The electric machine employs stator-side and housing-side coupling elements, including screw connections and keys, to securely align and decouple the stator from the housing, optimizing force transmission and reducing vibration transfer, thereby enhancing the machine's stability and compliance with vibration standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stator is rigidly welded into the machine housing, then the connection strength between stator and housing is improved, but vibrations and body noise are transmitted to the housing structure
Solution Approach 1:
A coupling element is introduced as an intermediary component between the stator and the machine housing. This coupling element provides a controlled connection that transmits necessary forces while reducing the transmission of vibrations and body noise to the housing structure, thereby resolving the contradiction between connection strength and vibration transmission.
2Stability of the object's composition
If vibration dampers are attached below the feet of the machine housing, then the decoupling of the machine housing from the rest of the system is improved, but the complexity of the housing structure increases
Solution Approach 1:
The vibration damping function is extracted from the housing structure itself and implemented through separate vibration dampers attached to the feet of the housing. This allows the housing structure to remain relatively simple while still achieving effective decoupling and vibration reduction through the added dampers.
3Manufacturing precision
If shims are used to align the stator in the machine housing, then the alignment precision is improved, but additional components and handling apparatus are required
Solution Approach 1:
The alignment function is merged into the coupling element itself, which provides both the mechanical connection and the alignment capability through its integrated design. This eliminates the need for separate shims and reduces the number of components and handling steps required during assembly.
4Manufacturing precision
If additional components are added to the stator for vertical alignment, then the alignment capability is improved, but the flow of forces becomes less favorable and vibration excitation increases
Solution Approach 1:
The coupling element serves as an intermediary that provides alignment capability while maintaining favorable force flow. By designing the coupling element with appropriate geometry and connection features, it achieves precise alignment without the need for additional stator components that would create unfavorable force paths and vibration excitation.
Data Source
AI summary
An electric machine includes a stator and a housing. The stator includes a laminated stator core and a first stator-side coupling element located at a height of an axis of the electric machine in an area of the laminated core. The first stator-side coupling element includes a first slot. The stator includes annular stator elements accommodating the first stator-side coupling element. The housing includes a first housing-side coupling element located at the height of the axis of the electric machine in an area of the laminated core and having a second slot. Screw connections provide a connection between the first stator-side coupling element and the first housing-side coupling element, and a key forms part of the connection between the first stator-side coupling element and the first housing-side coupling element. The stator is aligned in relation to the housing by at least two keys.