Segmented Stator Coil Schematic for Dynamo Electric Machines
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Solution Overview
Problem
The assembly and transportation of large gearless dynamoelectric machines, such as wind turbines and tidal power generators, are complicated by the need for complex electrical connections between stator segments, which are difficult to maintain and repair due to the requirement of subsequent insulation and lack of non-destructive separation capabilities.
Innovation Solution
Designing stator segments with closed coils that connect via extended end connections, allowing each segment to be impregnated and assembled as a self-contained unit, eliminating the need for subsequent coil connections across segment boundaries, enabling easier assembly, maintenance, and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stator segments are divided into multiple segments for easier transport and assembly, then the transportability and assembly ease are improved, but complex electrical connections are required between segments which increases device complexity and makes maintenance difficult
Solution Approach 1:
The stator is divided into multiple segments that can be transported and assembled separately. Each segment contains complete closed coils, eliminating the need for complex inter-segment electrical connections. The segmentation principle is applied to the stator structure while maintaining electrical independence of each segment.
Solution Approach 2:
The electrical connection problem between segments is extracted and eliminated by designing closed coils within each segment. The coils are contained entirely within individual segments, removing the need for external connection elements and simplifying the overall system architecture.
2Reliability
If subsequent insulation and coil connections are required after segment assembly, then electrical connectivity between segments is achieved, but maintenance and repair capabilities are reduced due to inability to non-destructively separate segments
Solution Approach 1:
The coils are designed as closed loops within each segment before assembly, performing the electrical connection function in advance. This preliminary design eliminates the need for subsequent insulation and connection operations, allowing segments to be easily separated for maintenance while maintaining electrical integrity during operation.
3Power
If very large generators are used in gearless wind turbines to achieve high power output, then power generation capability is improved, but the machine size and weight increase making transport and assembly more difficult
Solution Approach 1:
The large-diameter stator is segmented into multiple smaller, more manageable sections that can be transported separately and assembled on-site. This segmentation maintains the power generation capability of the large machine while improving transportability and assembly ease by breaking down the structure into modular 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
This configuration simplifies the assembly and transportation of large machines by allowing individual segments to be easily replaced and maintained, reducing downtime and logistical challenges, and facilitating the use of smaller, more manageable components for transport.
Implementation Method 1
The first conductor arranged at the first segment boundary is connected to the second conductor arranged at the second segment boundary via an extended end connection on the end winding
Implementation Method 2
EP 2 166 645 A1 discloses an extended end connection
Data Source
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AI summary
Winding scheme for a segmented stator of a dynamo-electric machine. The invention relates to a segment (1) for an annular stator of a dynamo-electric machine (14). Transport and assembly of such a machine (14) is simplified by the fact that the segment comprises: - a substantially circular arc-shaped cross-section, - a first and a second segment boundary (2, 3) to which a further segment (4) can be attached, - at least one coil (5, 6, 7) for each phase of a three-phase system, - at least one first conductor (8), - at least one second conductor (9), - wherein the first conductor (8) is connected to the second conductor (9) via an end connection (10) in the region of the winding ends, so that the coil (5) thus formed encloses at least the two remaining coils (6, 7).