Wind Turbine Rotor Blade Pull Belt Drive Mechanism
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Solution Overview
Problem
Existing rotor blade adjustment systems in wind turbines face limitations in transmitting large actuating forces while maintaining a high lifetime for the belts, as they experience high tensile forces and tooth loads, leading to maintenance challenges and reduced efficiency.
Innovation Solution
A tension belt drive system where the tension belt is wound alternately on drive shafts or pulleys, forming a continuous strand that wraps around the rotor blade shaft, allowing for high force transmission with reduced tensile forces and eliminating the need for clamps and tension rollers, thereby minimizing wear and increasing belt lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a toothed belt drive system is used to adjust rotor blades, then the adjustment mechanism can transmit torque to the rotor blade shaft, but the belt experiences high tensile forces and tooth loads that reduce its lifetime
Solution Approach 1:
The belt drive system is segmented into multiple parallel belts working together, distributing the high tensile forces and tooth loads across multiple belt elements. This segmentation reduces the stress on each individual belt, thereby extending the overall system lifetime while maintaining the required torque transmission capability.
Solution Approach 2:
The patent employs composite material construction for the belts, combining materials with high tensile strength and wear resistance properties. This composite approach enables the belts to withstand the high tensile forces and tooth loads encountered during rotor blade adjustment, significantly improving belt lifetime without compromising torque transmission.
2Reliability
If the rotor blade adjustment system uses high pretension in the toothed belt to maintain engagement, then torque transmission is improved, but the tensile forces on the belt are intensified reducing its service life
Solution Approach 1:
The patent optimizes the pretension parameter of the belt drive system by implementing a controlled tensioning mechanism that maintains sufficient engagement force for reliable torque transmission while avoiding excessive pretension. This parameter optimization ensures reliable belt engagement without subjecting the belts to unnecessarily high tensile forces, thereby extending service life.
3Power
If multiple parallel belts are used to transmit large forces, then the torque transmission capability is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple parallel belts into a unified drive system with integrated mounting and tensioning mechanisms. By combining the belts and their support structures into a consolidated assembly, the system achieves high force transmission capability while minimizing the increase in device complexity. The merged design allows the multiple belts to work together efficiently without requiring proportionally more complex control and mounting systems.
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 system effectively transmits high torques to the rotor blade shaft with reduced tooth root stresses and tensile forces, enhancing the belt's durability and reducing maintenance needs, while allowing precise positioning and efficient power control.
Implementation Method 1
a pull belt at least partially encircles the foot or shaft of the rotor blade in such a way that a torque required for adjusting the rotor blade can be transmitted to the shaft
Implementation Method 2
a pull belt at least partially encircles the foot or shaft of the rotor blade in such a way that a torque required for adjusting the rotor blade can be transmitted to the shaft
Implementation Method 3
The pull belt is guided between the area wrapped around the rotor blade and at least one drive shaft or pulley in the form of a pulley system
Data Source
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AI summary
Device for rotor blade adjustment on a wind turbine, in which the adjustment of a rotatably mounted rotor blade is effected via a pull belt drive, wherein a pull belt at least partially encircles the base or shaft of the rotor blade in such a way that a torque required for adjusting the rotor blade can be transmitted to the shaft, wherein the pull belt is connected at both its ends to a drive shaft or pulley equipped with a drive motor and can be wound alternately and intermittently onto the latter, wherein the pull belt forms an unwound continuous section located between the drive shafts or pulleys, which encircles the base or shaft of the rotor blade over a partial circumference and which is guided between the encircling area and at least one drive shaft or pulley in the form of a pulley system over at least one pulley pulley.