Amortisseur Assembly Rotor Vent Hole Alignment
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Solution Overview
Problem
The migration of slot amortisseurs and slot springs in rotor assemblies due to high rotations per minute, high accelerations, and vibrations leads to misalignment of vent holes, causing overheating and physical imbalance in generators.
Innovation Solution
The proposed solution involves an amortisseur assembly with end winding amortisseurs having finger elements and stop blocks, and slot amortisseurs with stop blocks, along with longer slot springs to enhance friction and maintain alignment, reducing the likelihood of migration and misalignment of vent holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rotor components (amortisseurs, springs, wedges) are tightly fitted in rotor slots to maintain alignment, then manufacturing precision and alignment are improved, but the components are more susceptible to migration due to high rotations, accelerations, and vibrations
Solution Approach 1:
The slot wedges are designed with an interference fit in the dovetail-shaped rotor slots, creating a preliminary mechanical constraint that prevents migration before operational forces act on the components. This preliminary action establishes a stable baseline alignment that resists the high rotations, accelerations, and vibrations during operation.
Solution Approach 2:
The slot springs serve as an intermediary element between the amortisseurs and slot wedges, providing continuous elastic pressure to maintain alignment. The springs act as a mediator that absorbs mechanical stresses from rotation and vibration while maintaining constant contact pressure to prevent component migration and vent hole misalignment.
2Reliability
If slot springs are made longer to enhance friction and reduce migration, then reliability is improved, but device complexity increases
Solution Approach 1:
The slot springs are designed with extended length as a parameter change to increase frictional force and contact pressure. This single parameter modification (increasing length) provides the necessary mechanical constraint to prevent amortisseur migration during high-speed operation, achieving improved reliability through a straightforward dimensional change rather than complex structural modifications.
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 effectively reduces the migration of rotor components and maintains the alignment of vent holes, preventing overheating and physical imbalance, thereby enhancing the operational efficiency and integrity of the generator.
Implementation Method 1
The slot springs can be leaf springs or other types of springs. In order to facilitate the radial flow cooling, each slot wedge, slot amortisseur, and slot spring, when used, has one or more vent hole so that over a length of a rotor slot, a plurality of vent holes can be spaced.
Implementation Method 2
The proposed solution involves an amortisseur assembly with end winding amortisseurs having finger elements and stop blocks, and slot amortisseurs with stop blocks, along with longer slot springs to enhance friction and maintain alignment, reducing the likelihood of migration and misalignment of vent holes.
Data Source
AI summary
An amortisseur assembly comprises an end winding amortisseur. The end winding amortisseur comprises a body, at least one finger element, and a stop block. The body comprises a first edge. The finger element extends from the first edge of the body, and comprises a first surface. The stop block can attached to the first surface. The amortisseur assembly can further comprise a slot amortisseur so that the stop block abuts an end of the slot amortisseur. The amortisseur assembly can be assembled on a radial-flow cooled rotor. A method of forming an amortisseur assembly for a rotor comprises providing one or more slot amortisseurs and one or more of the end winding amortisseurs. The slot amortisseurs can be provided by shortening existing slot amortisseurs. The slot springs can replace existing slot springs, and the one or more slot springs can be longer than the existing slot springs.