Temperature-Adaptive Eddy Current Damper for Stable High-Heat Damping
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Solution Overview
Problem
Eddy current dampers in wind turbines experience significant efficiency loss due to temperature dependence, leading to reduced damping effectiveness as the conductivity of conductors decreases with increasing temperature, resulting in inefficiencies and potential damage from excessive heat generation.
Innovation Solution
A temperature-adaptive eddy current rotary oscillation damper with a displacement element that adjusts the gap between a rotating magnetic disk and a stationary conductor element based on temperature changes, using a material with a higher expansion coefficient to maintain a consistent damping effect by varying the gap distance, and incorporating a cooling mechanism to dissipate heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductor element is used to generate eddy current damping, then damping effect is achieved, but heat is generated and conductivity decreases with increasing temperature
Solution Approach 1:
The patent employs a displacement element made of material with high thermal expansion coefficient that expands when heated by eddy current, automatically reducing the gap between magnetic and conductor elements to maintain damping effectiveness. This thermal expansion mechanism provides self-regulating temperature compensation without external control systems.
Solution Approach 2:
The displacement element utilizes the heat generated by eddy current itself to trigger the gap adjustment mechanism. The thermal expansion of the displacement element directly responds to the temperature rise, creating a self-regulating system that automatically compensates for temperature effects without requiring external sensors or actuators.
2Reliability
If the gap between magnetic disk and conductor element is reduced to maintain damping at high temperature, then damping efficiency is preserved, but heat generation increases
Solution Approach 1:
The patent dynamically changes the gap parameter in response to temperature variations. At elevated temperatures, the thermal expansion of the displacement element reduces the gap to compensate for decreased conductor conductivity, thereby maintaining damping efficiency. The system adapts the geometric parameter (gap distance) based on operating conditions.
Solution Approach 2:
The gap between magnetic and conductor elements is made dynamic rather than fixed. The displacement element allows automatic adjustment of the gap distance based on real-time temperature conditions, transitioning the system from a static to a dynamically adapting configuration that responds to thermal changes.
3Device complexity
If a fixed gap is used between magnetic and conductor elements, then device simplicity is maintained, but damping efficiency varies with temperature
Solution Approach 1:
The displacement element is designed with material properties that provide significant thermal expansion, creating a passive yet effective mechanism for gap adjustment. This approach maintains relative simplicity while achieving temperature-compensated damping through the inherent thermal response of the material.
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
Maintains high damping efficiency across a wide temperature range by self-regulating the gap distance between magnetic and conductor elements, effectively dissipating heat, and preventing excessive temperatures, thus ensuring reliable operation of wind turbines.
Implementation Method 1
a current is induced in an electrical conductor (conductor element) which is moved by a changing magnetic field (magnetic element/permanent magnets). This induced current, also called eddy current
Implementation Method 2
The functional principle of such dampers is based on the fact that a current is induced in an electrical conductor (conductor element) which is moved by a changing magnetic field
Implementation Method 3
considerable heat is generated by conversion of the kinetic energy. In the case of the eddy current dampers used in wind turbines, the heat output generated by the damping system can be between approximately 3 and 10 kW
Implementation Method 4
since the conductivity of available eddy current conductors (aluminum, copper, etc.) decreases with increasing temperature, the eddy current power is also significantly reduced
Implementation Method 5
having a temperature-dependent expansion volume which acts on the displacement element by having an expansion coefficient which is greater than that of the displacement element, such that the displacement element (a) upon expansion of the volume by an increase in temperature
Data Source
AI summary
The invention relates to an oscillation damper which is in particular suitable for wind turbines and which is based on the eddy current principle and is temperature-controlled in such a way that it can not only effectively dissipate the heat generated by the eddy current but can also effectively and self-adjustingly compensate for the damping loss occurring at higher temperatures.