Wind Turbine Drive Train Flexible Coupling Design
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Solution Overview
Problem
Direct-drive wind turbines require heavy and expensive main shafts to transmit torque and bending loads, which increases maintenance costs, especially for offshore installations due to the complexity and cost of supporting these components.
Innovation Solution
A direct-drive train design utilizing a flexible coupling between the main shaft or inner bearing race and the generator rotor, supported by a single rotary bearing, allowing for a shorter shaft and reduced component count, thereby saving weight, cost, and maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a long main shaft is used to transmit torque and bending loads in direct-drive trains, then the structural strength and load-bearing capacity are improved, but the weight and cost of the drive train increase
Solution Approach 1:
The patent divides the main shaft into two separate components: a shorter drive shaft and a generator shaft connected by a flexible coupling. This segmentation eliminates the need for a single long main shaft while maintaining load-bearing capacity through the combined system of shaft-coupling-generator shaft assembly.
Solution Approach 2:
The flexible coupling acts as an intermediary component between the drive shaft and generator shaft. It transmits torque while accommodating misalignments and reducing the load requirements on individual shaft segments, allowing each shaft to be shorter and lighter while maintaining overall system strength.
2Reliability
If two bearings are used to support the long main shaft, then the reliability of load transfer is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The bearing support system is segmented into two separate bearing locations: one supporting the drive shaft and another supporting the generator shaft. This segmentation distributes the load-bearing functions while reducing the complexity of a single long shaft support system.
Solution Approach 2:
The flexible coupling serves as a mediator that connects the two bearing-supported shaft segments. It allows each shaft to be independently supported by its own bearing, improving reliability through distributed support while maintaining system connectivity and torque transmission.
3Adaptability or versatility
If a flexible coupling is introduced between the main shaft and generator, then the adaptability to misalignments is improved, but the device complexity increases
Solution Approach 1:
The flexible coupling changes the mechanical parameters of the connection between shafts by introducing flexibility in radial, axial, and angular directions. This allows the system to adapt to misalignments while the coupling's inherent design keeps the added complexity manageable through standardized components.
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 design reduces the number of components, lowers maintenance costs, and makes the drive train more efficient by using a flexible coupling to accommodate misalignments and reduce the load on the bearing system, resulting in a more cost-effective and reliable direct-drive train.
Implementation Method 1
a flexible coupling member... to accommodate misalignments and reduce the load on the bearing system
Data Source
AI summary
A wind turbine drive train is provided. The wind turbine drive train includes a hub, a bearing system supporting the hub and having an inner race connected to the hub, and a generator gearlessly coupled to the inner race using a flexible coupling member.