Rotating Machine Insulation Coating for Automated Corona Shielding
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Solution Overview
Problem
Existing insulation systems for electrical rotating machines, particularly those in high- and low-voltage sectors, face challenges with manual application and quality control issues, leading to inefficiencies and reduced lifespan due to partial discharges causing heating and breakdown of organic materials.
Innovation Solution
A powder coating or wet enamel formulation comprising a hydrocarbon-based resin component with epoxy groups and a silicon-oxygen-based resin component, along with a hardener and catalyst, is used to produce insulation components like main insulation, outer corona shields, and terminal corona shields, enabling automated application and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual application of mica tape is used for insulation system, then insulation quality can be maintained, but production efficiency is reduced and labor costs increase
Solution Approach 1:
The patent replaces the mechanical manual winding and application process with an automated spray application system. The coating composition is applied using spray equipment that can be integrated into automated production lines, eliminating the need for manual tape winding while maintaining consistent insulation quality through controlled spray parameters.
Solution Approach 2:
The invention changes the physical state and application parameters of the insulation material from solid mica tape to a sprayable coating composition. By adjusting viscosity, particle size distribution, and spray conditions, the system achieves uniform insulation layers that meet quality requirements while enabling high-speed automated production.
2Productivity
If automated production methods are implemented, then productivity increases, but manufacturing precision and quality control become more difficult
Solution Approach 1:
The patent incorporates feedback mechanisms through controlled spray parameters, atomization control, and curing conditions that ensure consistent coating thickness and quality. The formulation is designed to provide self-leveling properties and uniform curing characteristics that reduce variability in automated production.
Solution Approach 2:
By optimizing the coating composition parameters including particle size distribution, viscosity, and chemical composition, the system achieves consistent spray application characteristics and uniform curing behavior that maintain high manufacturing precision in automated production environments.
3Reliability
If traditional insulation materials are used, then proven reliability is maintained, but lifespan is limited due to partial discharge induced heating and breakdown
Solution Approach 1:
The patent employs a composite coating composition containing inorganic particles (such as alumina, silica, or mica) dispersed in an organic binder matrix. This composite structure provides both the proven reliability of traditional insulation materials and enhanced resistance to partial discharge, thermal degradation, and electrical breakdown, thereby extending insulation lifespan by up to 8 times.
Solution Approach 2:
The invention addresses the harmful effects of partial discharges by incorporating materials with high partial discharge resistance into the coating formulation. The inorganic particles and specialized binder components convert the previously harmful partial discharge energy into harmless dissipation, preventing the heating and breakdown that limited traditional insulation lifespans.
4Reliability
If hand application of corona shields is used, then quality assurance is maintained, but automation and productivity are compromised
Solution Approach 1:
The patent replaces manual corona shield application with automated spray equipment that can be integrated into continuous production lines. The coating composition is designed to provide self-leveling and uniform thickness characteristics that ensure quality assurance without requiring manual intervention, enabling full automation of the insulation system application process.
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 solution allows for automated production of insulation components, reducing manual labor and enhancing the lifespan of insulation systems by up to a factor of 8, while eliminating the need for mica tape application, thus improving the reliability and efficiency of electrical rotating machines.
Implementation Method 1
at least one curable resin-resin or resin-hardener mixture which is especially in solid form as a powder coating formulation at room temperature or has been processed in a solvent to give a wet enamel, comprising at least one first resin component which is hydrocarbon-based and has at least two epoxy groups, at least one second resin component which is silicon-oxygen-based and is especially a siloxane compound and/or a silsesquioxane compound or a compound derivatized from these parent compounds and has at least one hydroxyl functionality
Data Source
AI summary
Various embodiments of the teachings herein include a powder coating or wet enamel for production of an insulation system of an electrical machine including a curable resin-resin or resin-hardener mixture in solid form as a powder coating formulation at room temperature or processed in a solvent to give a wet enamel. The mixture may include: a first hydrocarbon-based resin component with at least two epoxy groups; a second silicon-oxygen-based resin component with at least one hydroxyl functionality; and a hardener and/or an initiating catalyst. The first resin component is predominant by composition.