Magnet Wire Thermoplastic Insulation Blend

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Solution Overview

Problem

Conventional magnet wire insulation methods face challenges in achieving high dielectric breakdown strength and partial discharge performance due to limitations in enamel thickness and adhesive force, leading to increased costs with high-performance thermoplastic resins and complexity in layering processes.

Innovation Solution

The development of magnet wire with thermoplastic insulation formed from a blend of two or more polymeric materials, which eliminates the need for adhesive layers and reduces costs by providing improved dielectric breakdown, thermal aging, and physical properties, while maintaining performance comparable to high-end thermoplastics like PEEK.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional enamel insulation is applied in successive layers to increase dielectric strength, then dielectric breakdown strength is improved, but adhesive force between layers deteriorates and manufacturing complexity increases

Engineering Contradiction:

Improvedielectric breakdown strengthVSAvoidlayering process complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent combines multiple enamel layers into a single extruded thermoplastic insulation layer, eliminating the need for successive layering and baking processes. This single-layer extrusion approach maintains dielectric strength while significantly reducing manufacturing complexity and process steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent changes the insulation material from conventional enamel to extruded thermoplastic resin, fundamentally altering the insulation structure from multiple thin layers to a single thicker layer with improved dielectric properties and simplified application process.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If high-performance thermoplastic resins are used to improve dielectric properties, then partial discharge inception voltage is improved, but material cost increases

Engineering Contradiction:

Improvepartial discharge inception voltageVSAvoidmaterial cost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent uses composite thermoplastic resin formulations that combine multiple polymers to achieve high dielectric strength and partial discharge resistance. This composite approach provides high-performance properties comparable to expensive single-resin systems while optimizing material cost through synergistic material combinations.

Inventive Principle:

Principle #40Composite materials

3Strength

If enamel layer thickness is increased to improve dielectric performance, then dielectric breakdown strength is improved, but flexibility deteriorates and solvent blisters form

Engineering Contradiction:

Improvedielectric breakdown strengthVSAvoidwire flexibility

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent changes from thick enamel layers to extruded thermoplastic insulation with optimized thickness parameters. The extrusion process creates a uniform insulation layer that maintains flexibility while providing sufficient dielectric strength, avoiding the solvent blistering and brittleness issues associated with thick enamel layers.

Inventive Principle:

Principle #35Parameter changes

4Strength

If adhesive layers are added to improve interlayer adhesion between thermoplastic and enamel, then bonding strength is improved, but manufacturing complexity and cost increase

Engineering Contradiction:

Improveinterlayer adhesionVSAvoidinsulation structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the adhesive layer from the insulation structure by using extruded thermoplastic resin that bonds directly to the conductor and to itself in multiple layers, removing the need for separate adhesive materials and simplifying the overall insulation structure.

Inventive Principle:

Principle #2Taking out (Extraction)

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 use of polymeric blends in magnet wire insulation enhances dielectric breakdown strength, partial discharge inception voltage, and thermal performance, reduces material costs, and simplifies processing, offering improved electrical and mechanical properties compared to conventional thermoplastic polymers.

Implementation Method 1

The insulation provides for electrical integrity and prevents shorts in the magnet wire

Methodology Applied

Scientific EffectDielectric: Dielectric

Implementation Method 2

The use of thermoplastic insulation can increase the partial discharge inception voltage ("PDIV"), dielectric breakdown strength, and other electrical properties of a magnet wire insulation system

Methodology Applied

Scientific EffectDielectric breakdown: Dielectric

Data Source

PatentUS11615914B2Magnet wire with thermoplastic insulation

Publication Date: 2023.03.28 ESSEX SOLUTIONS USA LLC

AI summary

Magnet wire included extruded insulation formed from a blend of two or more different polymeric materials is described. A magnet wire may include a conductor and insulation formed around the conductor. The insulation may include at least one layer of extruded insulation formed from a blend of a first polymeric material and a second polymeric material different than the first polymeric material. The first polymeric material may include one of polyetheretherketone, polyaryletherketone, polyetherketoneketone, polyphenylsulfone, polyphenylene sulfide, or polybenzimidazole. The second polymeric material may include one of polyphenylsulfone, polyetherimide, polyethersulfone, polyphenylene sulfide, polycarbonate, or polyester.