Stator Frame Partition Walls for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stator housing designs for large rotating electrical machines fail to effectively reduce noise emissions while maintaining mechanical strength and centering of the laminated core, often requiring complex designs and materials that are prone to aging and limited in decoupling effectiveness.
Innovation Solution
A stator housing with dynamically designed elastic elements in the intermediate walls, featuring open slots and supplementary masses, which creates a dynamic system for vibration decoupling that operates above the natural frequency, providing both high mechanical strength and effective noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid partition walls are used to maintain mechanical strength and centering, then structural stability is improved, but noise reduction capability deteriorates
Solution Approach 1:
The partition wall is designed with elastic elements that allow dynamic deformation under vibrational loads while maintaining static structural integrity. The elastic elements enable the partition to adapt its stiffness characteristics - rigid at static loads for mechanical strength, and flexible at dynamic frequencies for noise reduction.
Solution Approach 2:
The partition wall combines rigid structural components with elastic damping elements to create a composite structure. This composite design integrates materials with different mechanical properties - rigid materials for structural strength and elastic materials for vibration isolation and noise reduction.
2Object-generated harmful factors
If elastic elements are added to reduce noise, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The elastic elements are integrated directly into the partition wall structure, merging the noise reduction function with the existing structural component. This combination eliminates the need for separate noise isolation systems and reduces overall device complexity.
Solution Approach 2:
The partition wall serves multiple functions simultaneously: structural support, centering of the stator core, torque transmission, and noise reduction. By making the partition wall multi-functional, the design avoids adding separate components for each function, thereby reducing complexity.
3Object-generated harmful factors
If elastomeric elements are used for vibration damping, then noise reduction is improved, but reliability deteriorates due to aging
Solution Approach 1:
The design uses simple elastic elements that can be easily replaced if needed, rather than complex elastomeric systems that degrade over time. The focus is on a straightforward mechanical solution that maintains reliability through simplicity rather than through durable elastomeric materials.
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
The solution achieves significant noise reduction by decoupling vibrations above the resonance frequency, maintaining mechanical rigidity for torque transmission and centering, and is structurally simple and cost-effective for universal application in medium to large electrical machines.
Implementation Method 1
open slots 4f are arranged in the intermediate walls 4 of the stator housing 1 on a radius in the form of a circular ring, evenly or unevenly distributed, such that a certain number of directed webs 4c are formed between an inner ring 4a and an outer area of the intermediate wall 4e. These directed ridges 4c act as elastic members in the radial direction by means of the open slots 4f
Implementation Method 2
In the circumferential direction, i.e. viewed tangentially or almost tangentially, the directed webs 4c, on the other hand, transfer the static moments coming from the stator core outwards to the outer, more stable parts
Implementation Method 3
a dynamic system for sound insulation. Furthermore, this has the advantage that this dynamic Sound insulation system can be dimensioned specifically for each individual version of such electrical machines by this increase in mass
Implementation Method 4
The solution achieves significant noise reduction by decoupling vibrations above the resonance frequency
Data Source
AI summary
The invention relates to a stator frame for a medium or large electrical machine for noise reduction. The problem to be solved by the invention is the creating of a stator frame (1) for a medium or large rotating electrical machine for noise reduction that enables both very high mechanical stiffness and a certain elasticity, is simple in design, inexpensive to produce, and can be used universally in electrical machines of different sizes. In the stator frame (1), specially designed elastic elements are arranged in the partition walls (4) of the thereby reinforced stator frame (1) for noise reduction, as vibration-reducing elements. Open slots (4f) are arranged in the partition walls (4) of the stator frame (2) on a radius, distributed regularly or irregularly in a circular shape, such that a certain number of directed webs (4c) are formed between an inner ring (4a) and an outer region of the partition wall (4e). Said directed webs (4c) have effect as elastic elements by means of the open slots (4f) in the radial direction; that is, they dampen or decouple vibrations, while the directed webs (4c), in contrast, considered in the circumferential direction, i.e. in the tangential or nearly tangential direction, transfer the tensile stress waves and torque oscillations coming from the stator plate pack to the outside, to the outer, more stable parts, i.e. to the outer region of the partition wall (4e) of the solid stator frame (1). Furthermore, the partition walls in the outer regions (4e) are reinforced by material, or additional, supplemented masses are arranged. The invention can be used for medium and large rotating electrical machines in the power range greater than 200 KW.