Stator End Plate Lamination for Generator Efficiency
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Solution Overview
Problem
Traditional electric generator stator end plates cause inefficiencies due to eddy-current losses, heating, increased costs, and reduced cooling efficiency, as they are passive components that hinder airflow and are not actively involved in energy production.
Innovation Solution
The stator design incorporates a lamination stack as both the final stator lamination and end plate, providing mechanical support and reducing losses by eliminating full steel end plates, with a stepped or curved edge profile that minimizes axial flux losses and enhances cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional full steel end plates are used, then mechanical support for stator teeth is provided, but eddy-current losses occur causing heating and reduced generator efficiency
Solution Approach 1:
The end plate is segmented into multiple thin laminations stacked together, replacing the solid steel plate. This segmentation breaks up the continuous conductive path that causes eddy currents, thereby reducing energy losses while maintaining mechanical support functionality.
Solution Approach 2:
The end plate uses a composite structure of multiple laminated layers, combining electrical insulation properties with mechanical strength. The laminated construction creates a material that resists eddy currents while providing the necessary structural support for stator teeth.
2Strength
If traditional full steel end plates are used, then mechanical support is achieved, but cooling efficiency is reduced due to resistance to cooling air flow
Solution Approach 1:
The end plate is divided into multiple thin laminated layers with gaps between them, allowing cooling air to pass through more easily while still providing the necessary mechanical support. This segmentation reduces the resistance to cooling air flow.
Solution Approach 2:
The laminated structure creates a porous configuration with spaces between layers, allowing cooling air to penetrate through the end plate more effectively. This improves cooling efficiency while maintaining structural integrity.
3Strength
If traditional uniform single-part steel end plates are used, then mechanical support is provided, but manufacturing cost increases due to multiple fastening components
Solution Approach 1:
The end plate is segmented into laminations that can be stacked and assembled more simply, reducing the need for extensive fastening hardware. This segmentation simplifies the manufacturing process and reduces component count.
Solution Approach 2:
The lamination stack itself provides both the mechanical support function and the structural integrity, merging multiple functions into a single assembled component. This eliminates the need for separate fastening elements like bolts, nuts, and washers.
4Strength
If end plates are provided at stator longitudinal ends, then mechanical support for lamination and teeth is achieved, but axial leakage flux from coil heads creates additional heating
Solution Approach 1:
The end plate is segmented into laminated layers that interrupt the path of axial leakage flux, reducing the formation of eddy currents caused by this flux. This segmentation minimizes additional heating from leakage flux.
Solution Approach 2:
The electrical properties of the end plate are changed by using laminated construction instead of solid steel, altering the electrical resistance and reducing the impact of axial leakage flux. This parameter change reduces energy losses.
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 improves energy production efficiency, reduces costs, and simplifies the stator structure by using laminations for both mechanical support and energy production, while optimizing cooling and minimizing losses.
Implementation Method 1
The end plate may have a typical finger shape for following the shape of the stator teeth and establishing pressure on the stator lamination teeth
Implementation Method 2
the second end surface having a lower radial extension than the first end surface
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A stator (11) for an electric generator comprises: - a stator body (13) including a stator yoke (23) and a plurality of teeth (33) protruding according to a radial direction orthogonal to the longitudinal axis (Y) from the stator yoke (23) to respective tooth radial ends (38), each tooth extending longitudinally between the first longitudinal end (31) and the second longitudinal end (32), - at least one end plate (50) for longitudinally supporting the stator body (11) at the first longitudinal end (31) and/or the second longitudinal end (32), wherein end plate (50) longitudinally extends between a first end surface (50a) adjacent to the stator body (13) and a longitudinally opposite second end surface (50b), the second end surface (50b) having a lower radial extension than the first end surface (50a).