Enameled Flat Wire Coating Die Protrusions for Thickness Uniformity
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Solution Overview
Problem
Conventional coating dies for enameled flat wires suffer from circumferential nonuniformity in coating thickness, leading to undesirable local thickening/thinning phenomena, which degrade electrical insulation and hinder accurate coil winding.
Innovation Solution
A solid die with inwardly projecting protrusions on its inner surface to streamline varnish flow and prevent misalignment, ensuring uniform enamel coating thickness across the entire surface of flat wire conductors by creating regions with larger surface curvature differences that retard varnish flow from corners to flat surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating dies are used to apply insulation enamel to flat wires, then the coating process can be completed, but circumferential nonuniformity in coating thickness occurs leading to local thickening and thinning
Solution Approach 1:
The die inner surface is equipped with protrusions at specific locations (corners and side centers) that create localized variations in the gap between the die and conductor. These protrusions generate larger surface curvature differences at corners compared to side centers, which locally retards varnish flow from corners to flat surfaces, thereby achieving uniform coating thickness across different regions of the conductor
Solution Approach 2:
The protrusions on the die inner surface are designed to preemptively counteract the natural tendency of varnish to flow from corners to flat surfaces during coating. By creating larger surface curvature differences at corners before varnish application, the die structure pre-establishes conditions that prevent excessive varnish migration, ensuring uniform coating thickness is achieved during the coating process
2Adaptability or versatility
If die assemblies are used to accommodate different size flat wire conductors, then adaptability is improved, but accurate control of gap between die hole and conductor is difficult
Solution Approach 1:
The die incorporates protrusions at specific locations (corners and side centers) that create localized gap variations. These protrusions ensure that even when accommodating different conductor sizes, the gap between die and conductor is precisely controlled at critical regions, maintaining accurate coating thickness control while preserving adaptability to various conductor dimensions
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 achieves a uniform enamel coating thickness with minimal differences between maximum and minimum thicknesses, enhancing electrical insulation and coil winding accuracy while maintaining a high filling factor.
Implementation Method 1
by creating regions with larger surface curvature differences that retard varnish flow from corners to flat surfaces
Data Source
AI summary
An enameled flat wire includes a flat wire and an enamel coating. The difference in thickness of the enamel coating on flat surfaces between a maximum thickness and a minimum thickness is equal to or less than 25% of the predetermined thickness. The enamel coating prior to baking includes a maximum surface curvature on each of the rounded corners of the wire, and a depression on at least one of the flat surfaces of the wire, the depression has a maximum surface curvature. The maximum surface curvature of the depression is larger than the maximum surface curvature of the enamel coating prior to baking on at least one of the rounded corners thereof.