Synchronous Generator Stator Decoupling Units for Noise Reduction
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Solution Overview
Problem
Synchronous generators in wind turbines face challenges in reducing acoustic emissions, primarily due to the transmission of vibrations and structure-borne noise from the stator core to the stator ring, which affects operational efficiency and noise levels.
Innovation Solution
The integration of decoupling units with a vulcanized rubber pressure mat between the stator ring and stator core, allowing for the introduction of a pressure medium to increase the gap thickness and effectively decouple vibrations and noise, comprising first and second plates with a mat having a cavity and inlet valve, arranged in a circumferential gap to reduce noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the stator core is directly connected to the stator ring, then structural simplicity is maintained, but vibrations and structure-borne noise are transmitted from the stator core to the stator ring
Solution Approach 1:
A decoupling unit is introduced as an intermediary element between the stator core and stator ring. This decoupling unit includes a mat with cavity filled with pressure medium that acts as a mediator to block the transmission path of vibrations and structure-borne noise from the stator core to the stator ring, thereby reducing acoustic emissions without requiring complete structural redesign
Solution Approach 2:
The decoupling unit employs composite material construction, combining a mat (such as rubber or foam material) with a cavity filled with pressure medium. This composite structure leverages the vibration-absorbing properties of the mat material and the acoustic damping effects of the pressure medium to effectively reduce noise transmission while maintaining structural integrity
2Object-affected harmful factors
If a decoupling unit with pressure mat is introduced between stator ring and stator core, then acoustic emissions are reduced, but device complexity increases
Solution Approach 1:
The decoupling unit is designed as a segmented modular component that can be independently manufactured and installed between the stator ring and stator core. The segmentation allows the complex noise-reduction function to be achieved through a discrete, self-contained unit rather than requiring complex integration into the existing structure
Solution Approach 2:
The decoupling unit serves as a mediator component that bridges the stator ring and stator core while blocking noise transmission. By positioning this intermediary element in the gap between the two main components, the patent achieves noise reduction without requiring fundamental changes to the existing stator structure
3Object-affected harmful factors
If the gap between stator ring and stator core is increased to reduce noise, then acoustic emissions are reduced, but structural stability may be compromised
Solution Approach 1:
The decoupling unit uses composite material construction combining a mat (rubber or foam) with a cavity filled with pressure medium. This composite structure provides both vibration isolation and structural support, allowing the gap between stator ring and stator core to be effectively managed without compromising overall structural stability
Solution Approach 2:
The pressure medium in the cavity can be adjusted to change the stiffness and damping characteristics of the decoupling unit. By modifying parameters such as pressure medium type, cavity volume, and mat material properties, the system can be optimized to provide adequate vibration isolation while maintaining necessary structural stability
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 significantly reduces acoustic emissions by decoupling vibrations and structure-borne noise, enhancing the operational silence and efficiency of the synchronous generator in wind turbines.
Implementation Method 1
a pressure medium is introduced into the cavity of the mat between the first and the second plate, after the plurality of decoupling units have been inserted in the gap
Implementation Method 2
The decoupling unit has a first plate, which is matched to the (outer) contour of the stator core, and has a second plate, which is matched to the (inner) contour of the stator ring. A mat, having a cavity and an inlet valve, is provided between the first and the second plate
Implementation Method 3
the mat is designed as a vulcanized-in rubber pressure mat
Data Source
AI summary
The invention provides a synchronous-generator stator, comprising a stator ring, a stator core, a circumferential gap between the stator ring and the stator core, and a plurality of decoupling units in the gap, wherein the decoupling unit has a first plate, which is matched to a contour of the stator core, and has a second plate, which is matched to the contour of the stator ring, wherein a mat, having a cavity and an inlet valve, is provided between the first and the second plate.