Electric Machine Housing With Segmented Damping Modules
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Solution Overview
Problem
Conventional electric-machine housings with integral damping structures face challenges in manufacturing, including high difficulty, long processing cycles, and high costs, making mass production impractical, particularly for electric vehicles where noise and vibration issues are critical.
Innovation Solution
The electric-machine housing structure comprises an outer housing, an inner housing, and intermediate pieces with protrusions and grooves for secure fixation, featuring hollow arcuate structures that can be filled with damping media to absorb vibrations and noise, and an S-shaped cooling channel for efficient heat dissipation, allowing for simpler manufacturing and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integral damping structure is used in the electric-machine housing, then the damping performance is improved, but the manufacturing difficulty increases and the processing cycle lengthens
Solution Approach 1:
The housing is divided into multiple modular sections (first housing, second housing, third housing) that can be manufactured separately and then assembled. Each section can be produced using standard manufacturing processes, avoiding the complexity of creating a single integral damping structure while maintaining effective damping through the coordinated arrangement of separate components.
2Reliability
If an integral damping structure is used in the electric-machine housing, then the damping performance is improved, but the manufacturing cost increases
Solution Approach 1:
By segmenting the housing into standardized modules that can be manufactured using conventional processes, the overall manufacturing cost is reduced compared to producing a single complex integral structure. The modular design allows for economies of scale and easier quality control.
Solution Approach 2:
Multiple functional elements (housing structures, damping features, mounting interfaces) are combined into integrated modular units. This merging approach maintains the damping effectiveness of integral structures while enabling more efficient manufacturing through standardized module production and assembly.
3Reliability
If an integral damping structure is used in the electric-machine housing, then the damping performance is improved, but the processing cycle lengthens
Solution Approach 1:
The housing components are segmented into separate modules that can be manufactured simultaneously using parallel processing. This eliminates the sequential processing required for integral structures, significantly reducing the overall processing cycle while maintaining damping performance through proper module assembly.
4Device complexity
If conventional integral housing design is used, then the structural simplicity is maintained, but the NVH performance deteriorates
Solution Approach 1:
The housing is segmented into multiple sections with specific damping features incorporated into each module. This segmentation allows for targeted vibration control in different regions without requiring a completely complex overall structure, maintaining relative simplicity while improving NVH performance.
Solution Approach 2:
Damping features and structural characteristics are optimized locally in different housing sections based on specific vibration and noise requirements. Each module can have tailored properties (wall thickness, material composition, geometric features) to address local NVH issues while maintaining overall structural simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces vibration and noise transmission, enhances damping coefficients, and facilitates mass production with a simpler and faster manufacturing process, improving user comfort and reducing manufacturing expenses.
Implementation Method 1
the intermediate pieces are overall hollow arcuate structures or annular structures, upper surfaces and lower surfaces of the intermediate pieces are provided with a plurality of protrusions and/or grooves... filled with a damping medium
Implementation Method 2
an S-shaped cooling channel for efficient heat dissipation
Data Source
AI summary
The present disclosure discloses an electric-machine housing structure, wherein the electric-machine housing structure includes an outer housing, an inner housing and a plurality of intermediate pieces provided between the outer housing and the inner housing; and the intermediate pieces are overall hollow arcuate structures or annular structures, upper surfaces and lower surfaces of the intermediate pieces are provided with a plurality of protrusions and/or grooves, the protrusions and/or grooves of the upper surfaces match with and are fixed to grooves and/or protrusions on an inner circumferential face of the outer housing, and the protrusions and/or grooves of the lower surfaces match with and are fixed to grooves and/or protrusions on an outer circumferential face of the inner housing.