Glass-Ceramic Coil Insulation for High-Temperature Electromagnetic Machines
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Solution Overview
Problem
Conventional electromagnetic coils with polyamide wire insulation have limited operational temperatures, restricting power density and operating environments due to heat generation and transfer issues, necessitating improved thermal and environmental capabilities in stator assemblies.
Innovation Solution
The method involves pre-coating magnet wire with a high-temperature insulation precursor, winding it with a glass-ceramic slurry, thermally processing to form a wet-wound green coil, applying a second insulation layer, and further thermal processing to produce fully processed electromagnetic coils for high-temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyamide wire insulation is used in electromagnetic coils, then ease of manufacture is improved, but operational temperature capability deteriorates (limited to less than 240°C short term and less than 150°C long term)
Solution Approach 1:
The patent applies composite materials by combining glass-ceramic insulation material with magnet wire to create an electromagnetic coil capable of withstanding high temperatures. The glass-ceramic coating is applied to the magnet wire and then fired to form a composite structure that maintains electrical insulation properties while withstanding temperatures exceeding 240°C, thereby resolving the contradiction between ease of manufacture and operational temperature capability.
2Device complexity
If conventional insulation materials are used, then manufacturing simplicity is improved, but power density deteriorates due to temperature limitations
Solution Approach 1:
The patent applies parameter changes by modifying the insulation material's thermal parameter (temperature resistance) through the use of glass-ceramic coating. This enables the electromagnetic coil to operate at higher temperatures, which in turn allows for higher current densities and improved power density without significantly increasing manufacturing complexity, as the coating process can be integrated into existing manufacturing workflows.
3Power
If high current is applied to electromagnetic coils, then power output is improved, but heat generation increases causing insulation failure
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful effect of heat generation into a beneficial outcome. The glass-ceramic insulation material is specifically designed to withstand high temperatures, allowing the coil to operate at higher temperatures without insulation failure. This enables higher current application and improved power output, as the previously harmful heat is now managed effectively by the temperature-resistant insulation.
4Reliability
If cooling systems are added to manage heat, then operational reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent applies the taking out principle by removing the need for external cooling systems through the use of glass-ceramic insulation material. The high temperature resistance of the insulation allows the electromagnetic coil to dissipate heat more effectively without requiring additional cooling components, thereby maintaining operational reliability while reducing device complexity and weight.
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 process enhances the thermal and environmental capabilities of electromagnetic machines, allowing for higher power density and extended operating temperatures, reducing the need for cooling systems and improving efficiency.
Implementation Method 1
winding, while applying in-situ a glass-ceramic slurry, the pre-coated magnet wire into a predetermined coil shape to produce a wet-wound green coil; thermally processing the wet-wound green coil to produce an intermediately processed coil
Implementation Method 2
pre-coating magnet wire with a high-temperature insulation precursor to produce pre-coated magnet wire; applying a second layer of a high-temperature insulation to the intermediately processed coil
Implementation Method 3
current flow through the electromagnetic coils causes heat to be generated due, in part, to the resistance of the coils
Data Source
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AI summary
A method of making an electromagnetic coil for use in a high-temperature electromagnetic machine includes pre-coating magnet wire with a high-temperature insulation precursor to produce pre-coated magnet wire, winding, while applying in-situ a glass-ceramic slurry, the pre-coated magnet wire into a predetermined coil shape to produce a wet-wound green coil, and thermally processing the wet-wound green coil to produce a processed coil. In some instances, a second layer of a high-temperature insulation may be applied to the processed coil to produce a further insulated processed coil, and then thermally processing the further insulated processed coil to produce a further processed electromagnetic coil.