Electrical Insulation Curing Profile Using Reaction Modeling
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Solution Overview
Problem
The manufacturing process of electrical insulation in rotors and stators of electric motors is costly due to high energy consumption, CO2 emissions, and inefficient use of resources, primarily in the immersed impregnation and hot air oven curing methods.
Innovation Solution
A method to determine the curing progression of an electrical insulation layer by using a reaction model based on measured enthalpies of reaction at different heating rates, integrated with a temperature progression, allowing precise control of the curing process through a thermocouple and UV curing, optimizing material consumption and energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot air oven curing is used for curing insulation material, then effective curing is achieved, but energy consumption and CO2 emissions increase significantly
Solution Approach 1:
The patent changes the curing parameters by using UV irradiation instead of thermal heating, fundamentally altering the curing mechanism from thermal to photopolymerization. This allows curing to occur at lower temperatures and reduces energy consumption while maintaining curing effectiveness
Solution Approach 2:
The patent replaces the thermal field (hot air oven) with a UV field (irradiation source), substituting one physical field for another more efficient one. This substitution enables precise control of curing progression and reduces overall energy requirements
2Reliability
If traditional immersed impregnation and hot air oven curing is used, then complete curing is achieved, but manufacturing cycle time and production costs increase
Solution Approach 1:
The patent uses periodic UV irradiation with controlled intensity and duration to achieve complete curing. By applying UV energy in controlled cycles rather than continuous heating, the process achieves thorough curing faster and allows for better process control and automation
Solution Approach 2:
The patent implements feedback control by measuring curing progression (through temperature monitoring and reaction model) and adjusting UV irradiation parameters accordingly. This ensures complete curing is achieved efficiently without unnecessary extended processing time
3Speed
If high temperature hot air curing is applied, then curing speed increases, but energy consumption and environmental impact worsen
Solution Approach 1:
The patent changes the fundamental curing parameter from temperature-based to UV intensity-based control. This allows fast curing speeds to be achieved through high-intensity UV irradiation rather than high temperature, avoiding the energy waste associated with heating large volumes of air and equipment
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 approach reduces manufacturing costs and energy consumption while ensuring effective curing of the insulation material, enabling faster production cycles and improved automation.
Implementation Method 1
providing a reaction model of the insulation material that gives the progression of curing of the insulation material on the basis of a temperature progression as input parameter and is modeled on the basis of measured enthalpies of reaction (h1, . . . , h6) of the insulation material (40) at at least two, or at least four, different heating rates
Implementation Method 2
The temperature progression (TC) is a measured temperature progression of an electrical product, especially a temperature progression measured with a thermocouple in an electrical winding system
Data Source
AI summary
Various embodiments of the teachings herein include a method of ascertaining a progression of curing on application of an electrical insulation layer of an insulation material in a liquid state to an electrical product. An example includes: providing a temperature progression that the electrical product undergoes in the course of application and curing of the insulation layer; providing a reaction model of the insulation material to give a progression of curing of the insulation material on the basis of a temperature progression as input parameter and modeled on the basis of measured enthalpies of reaction of the insulation material at two different heating rates; and ascertaining the progression of curing using the reaction model with the temperature progression.