Stator Acoustic Decoupling via Segmented Rings
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Solution Overview
Problem
Conventional electric motor designs face challenges in achieving adequate acoustic decoupling of the stator from the housing while ensuring proper fixation and centering, leading to high noise levels due to uncontrolled vibration transmission.
Innovation Solution
The arrangement includes concentrically positioned cylindrical decoupling rings with recesses on their peripheral surfaces, which are fixed to both the stator and the housing, allowing for effective vibration compensation and acoustic decoupling, while pegs and grooves ensure precise centering and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid connection between the stator and housing is used, then structural stability and fixation are improved, but acoustic decoupling deteriorates and noise levels increase
Solution Approach 1:
The decoupling ring is segmented with recesses distributed around its circumference, dividing the continuous rigid connection into discrete connection points. This segmentation allows the structure to maintain overall stability while creating compliance zones that reduce vibration transmission to the housing.
Solution Approach 2:
The decoupling ring changes the mechanical parameter of connection rigidity by introducing recesses that reduce stiffness in specific directions. This allows the connection to remain stable for fixation purposes while becoming compliant enough to decouple acoustic vibrations, effectively changing the rigidity parameter to achieve both goals.
2Object-affected harmful factors
If elastic components are used to suspend the stator, then acoustic decoupling is improved, but fixation and centering precision deteriorates
Solution Approach 1:
The decoupling ring is divided into multiple segments by recesses around its circumference, creating a structure that is compliant for vibration decoupling while maintaining geometric precision for centering. The segmented design allows elastic deformation for damping while preserving the overall circular geometry needed for accurate centering.
Solution Approach 2:
The decoupling ring combines rigid structural elements with compliant features (recesses), creating a composite structure that exhibits both rigid geometric stability for centering and elastic compliance for vibration decoupling. This composite approach integrates both functions in a single component.
3Object-affected harmful factors
If the stator is positioned at a distance from the housing wall, then acoustic decoupling is improved, but structural support and fixation become more difficult
Solution Approach 1:
The decoupling ring acts as an intermediary component between the stator and housing, providing both mechanical support and acoustic decoupling. This intermediary element simplifies the fixation system by integrating multiple functions (support, centering, and decoupling) into a single component that bridges the gap between the stator and housing wall.
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 solution effectively reduces noise transmission by decoupling vibrations and ensuring the stator is accurately positioned within the housing, balancing acoustic performance and structural integrity.
Implementation Method 1
the laminated core seat has a tube on the inside of which the laminated core is fastened via a laminated core seat, the tube wall having perforations distributed around its circumference
Implementation Method 2
The soundproofing can be further improved in that the tube wall of the tube is at least partially surrounded by a non-load-bearing wall of the stator housing
Implementation Method 3
the motor stator is suspended in the housing of the vacuum pump with the aid of elastic components, for example elastomer rings, which leads to a vibration-related decoupling of the motor stator
Data Source
AI summary
The invention relates to an arrangement for acoustic decoupling of a stator (10) of an electric motor (11) having two substantially cylindrical decoupling rings (15; 42) disposed on both sides of the stator (10) and concentric to a motor shaft, each fixed to a front side (20) of the stator (10) on one side and each fixed to a housing (12; 40) enclosing the stator on the other side, and comprising recesses (16) on the circumferential surfaces thereof. The decoupling rings (15; 42) hold the stator (19) in a centered position at a distance from the housing. The recesses (16) allow targeted acoustic decoupling. The invention is particularly applicable for electric motors in steering systems for motor vehicles.