Wind Turbine Eccentric Shaft Transmission for Asynchronous Drive
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Solution Overview
Problem
Existing wind turbine configurations where multiple turbines are mechanically rigidly connected hinder effective energy generation under varying wind conditions, as they do not allow for independent contribution of each turbine to energy production.
Innovation Solution
A mechanical transmission system utilizing an eccentric shaft with a lifting rod and coupling devices allows for asynchronous operation of wind turbines, enabling them to contribute energy only when wind conditions are sufficient, with a common generator driven by synchronized collecting shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple wind turbines are mechanically rigidly connected to drive a common generator, then a single generator can be used to reduce device complexity, but the wind turbines cannot operate independently under varying wind conditions, reducing adaptability
Solution Approach 1:
The patent applies the dynamics principle by introducing a mechanical transmission system with eccentric shafts and lifting rods that converts rotational motion to linear motion, enabling each wind turbine to independently control its power transmission to the common generator. This dynamic mechanism allows turbines to engage or disengage from the common drive system based on individual wind conditions, resolving the contradiction between using a single generator and maintaining independent operation capability.
2Device complexity
If wind turbines are coupled via a common mechanical gear, then device complexity is reduced, but mechanical stress increases when turbines operate at different speeds
Solution Approach 1:
The patent applies segmentation by dividing the common drive system into independent transmission units, where each wind turbine has its own eccentric shaft and lifting rod assembly that can operate independently. This segmentation allows each turbine to transmit power only when wind conditions are favorable, preventing mechanical stress conflicts that would occur in a rigidly coupled system where all turbines must operate at synchronized speeds.
Solution Approach 2:
The dynamic mechanical transmission system with eccentric shafts and lifting rods enables each turbine to independently control its power transmission timing and magnitude. This dynamic capability allows the system to accommodate varying wind speeds across different turbines without creating excessive mechanical stress, as each turbine can engage or disengage from the common generator drive based on its own operational conditions.
3Ease of operation
If all wind turbines must operate at the same rotational speed to drive a common generator, then the generator operation is simplified, but energy generation efficiency decreases when wind conditions vary
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic mechanical transmission system where each turbine's rotational motion is converted to linear motion via eccentric shafts and lifting rods, which then drives the common generator independently. This allows turbines to operate at different rotational speeds determined by local wind conditions while still contributing to the common generator output, maintaining both operational simplicity and energy generation efficiency.
Solution Approach 2:
The patent applies parameter changes by transforming the rotational speed parameter of each turbine into a controlled linear motion parameter through the eccentric shaft mechanism. This parameter transformation allows the system to accommodate varying rotational speeds from different turbines (due to varying wind conditions) while maintaining consistent operational input to the common generator, thereby preserving both ease of operation and productivity.
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 design allows for optimized energy generation by decoupling slower turbines and ensuring continuous operation of the system, reducing mechanical stress and enabling modular expansion of wind turbine capacity.
Implementation Method 1
The mechanical transmission on each wind turbine comprises an eccentric shaft with an associated lifting rod. This arrangement is preferably implemented by designing each rotor shaft as an eccentric shaft. A disc is arranged on each rotor shaft, to which a lifting rod is pivoted, offset from the axis of rotation. The rotational movement of the rotor shaft is converted into an up-and-down movement of the lifting rod.
Implementation Method 2
Two mechanical coupling devices are arranged on each lifting rod, which transmit power from the lifting rod or a lifting part described below to one of the two collecting shafts. These coupling devices each have a freewheel in one direction of movement, i.e., an upward or downward movement of the lifting rod or lifting part, in which they are mechanically decoupled from the associated collecting shaft.
Data Source
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AI summary
The invention relates to a wind power plant (1) comprising a plurality of wind turbines (2a, 2b, 2c, ...), wherein each wind turbine (2) comprises a tower (3) having a rotatable nacelle (4) and comprises a rotor (5) on the nacelle (4) having a rotor shaft (6), and a plurality of wind turbines (2a, 2b, 2c, ...) are coupled to one another via a mechanical transmission (7) in order to drive a common generator (8) for generating electrical energy, wherein, for the purpose of a simple and modular design, the transmission (8) is designed such that each rotor shaft (6) is an eccentric shaft which cooperates with a lifting rod (9), wherein an upward and downward movement (a) can be transferred from the lifting rod (9) via two coupling elements (10a, 10b) to two collecting shafts (11a, 11b), in each case into a rotational movement (D), and the collecting shafts (11a, 11b) are designed to drive the common generator (8).