Filled Polyimide Magnet Wire Insulation for Corona Resistance
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Solution Overview
Problem
Magnet wire insulation is prone to degradation under high voltage and temperature conditions, leading to premature failures in electrical devices, and existing solutions either increase costs or reduce efficiency by adding additional components or reducing copper space.
Innovation Solution
Incorporating a filler material blend of titanium(IV) oxide and silica oxide into the polyimide insulation of magnet wire, along with additives like Cymel materials, to enhance corona resistance, thermal conductivity, and thermal life, while maintaining flexibility and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of insulation is increased to improve winding life, then the life of windings is improved, but the cost increases and the amount of space for copper decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the polyimide insulation by incorporating specific additives (silica oxide, titanium dioxide, zirconium oxide) and fillers. This modifies the insulation's properties to achieve higher corona resistance and thermal stability, allowing adequate protection at standard insulation thicknesses without increasing cost or reducing copper space.
Solution Approach 2:
The patent creates a composite insulation material by combining polyimide base resin with inorganic fillers (silica oxide, titanium dioxide, zirconium oxide) and additives. This composite structure provides enhanced corona resistance and thermal conductivity, achieving improved winding life protection without requiring increased insulation thickness, thus avoiding the trade-off between reliability and device complexity.
2Reliability
If the amount of insulation is increased to improve winding life, then the life of windings is improved, but the efficiency decreases due to reduced copper space
Solution Approach 1:
The patent modifies the insulation material parameters by adding inorganic fillers and additives to polyimide, enhancing its corona resistance and thermal properties. This allows the insulation to provide adequate protection at standard thicknesses, preventing the need to reduce copper space and thereby maintaining motor efficiency while improving winding life.
Solution Approach 2:
The composite insulation material combines polyimide with inorganic fillers (silica oxide, titanium dioxide, zirconium oxide) to achieve superior corona resistance. This enables the insulation system to protect windings effectively at standard thicknesses, avoiding the need to compromise copper space and preserving motor efficiency while extending winding life.
3Ease of manufacture
If standard polyimide insulation is used under high voltage conditions, then the manufacturing is simple, but the insulation degrades prematurely due to corona discharge
Solution Approach 1:
The patent modifies the chemical parameters of polyimide insulation by incorporating inorganic fillers (silica oxide, titanium dioxide, zirconium oxide) and additives. These parameter changes enhance the insulation's corona resistance and thermal stability, allowing it to withstand high voltage conditions without premature degradation while maintaining the existing enameling process and manufacturing simplicity.
Solution Approach 2:
The patent develops a composite insulation material by combining polyimide with inorganic fillers and additives. This composite structure provides superior corona resistance and thermal conductivity, enabling the insulation to survive high voltage conditions without premature failure. The manufacturing process remains simple as it uses conventional enameling techniques with modified resin composition.
4Ease of manufacture
If polymeric enamel insulation is used at maximum operating temperatures, then the manufacturing process is simple, but the insulation breaks down under high voltage conditions
Solution Approach 1:
The patent changes the thermal and electrical parameters of the polyimide insulation by incorporating inorganic fillers (silica oxide, titanium dioxide, zirconium oxide) and additives. These modifications enhance the insulation's thermal conductivity and corona resistance, allowing it to withstand high voltage conditions at maximum operating temperatures without breakdown, while maintaining the simple enameling manufacturing process.
Solution Approach 2:
The patent creates a composite insulation material by combining polyimide with inorganic fillers and additives. This composite provides enhanced thermal conductivity and corona resistance, enabling the insulation to resist voltage breakdown under high temperature conditions. The manufacturing process remains simple as it uses conventional enameling techniques with modified resin composition.
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 filled polyimide insulation significantly extends the life of magnet wire and electrical devices under adverse conditions, improves thermal conductivity, and allows for higher voltage operation without increasing costs or reducing efficiency.
Implementation Method 1
Incorporating a filler material blend of titanium(IV) oxide and silica oxide into the polyimide insulation of magnet wire, along with additives like Cymel materials, to enhance corona resistance, thermal conductivity, and thermal life
Implementation Method 2
Magnet wire that includes insulation formed from corona resistant polyimide designed to improve the life and thermal conductivity of motor windings
Data Source
AI summary
Magnet wire with corona resistant enamel insulation may include a conductor, and at least one layer of polymeric enamel insulation may be formed around the conductor. The polymeric enamel insulation may include a filler dispersed in a base polyimide material. Additionally, the polymeric enamel insulation may have a thermal index of at least 260° C.