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Flat Copper Winding Wire

Flat enameled copper winding wire—also known as flat enameled copper wire, rectangular enameled copper wire, or “Flat Enameled Copper Winding Wire”—is a specialized electromagnetic winding wire with a rectangular cross-section. It is manufactured using high-purity oxygen-free copper as the conductor base material, followed by precision rolling, annealing, continuous multi-layer application of insulating varnish, and high-temperature curing.
Specification range Square:4-65mm² Flat:a:0.80-4.50mm; b:2.80-16.00mm
Execution Standard IEC 60371; NEMA MW 1000; GB/T 7095.3-2008
Thermal Index Class 155,Class 180,Class 200, Class 220
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Product Briefing
Flat Enameled Copper Winding Wire — Application
High-Temperature Flat Enamelled Copper Wire
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Product Briefing

Unlike the circular cross-section of conventional round enameled wire, flat enameled copper wire features a uniform rectangular cross-section design with precision-rounded corners. This design balances conductor electrical efficiency, insulation reliability, bendability, and winding compactness, making it a high-end winding material specifically developed for high-power, high-density, high-heat-dissipation, and high-durability electromagnetic winding applications.

The product strictly complies with the IEC 60317 International Electrotechnical Standard,the GB/T 6109.4 national standard, and the IATF 16949 automotive quality management system standard. Its dimensional accuracy, insulation consistency, mechanical properties, and electrical performance far exceed those of ordinary general-purpose electromagnetic wire.

Flat Copper Winding Wire
Flat Enameled Copper Winding Wire — Application

Application

Operating Conditions

Recommended Wire Characteristics

Key Benefits

New Energy Vehicle Drive Motors

800V platforms, high-frequency SiC pulses, oil cooling, up to 20,000 rpm, −40°C to 180°C, vibration and shock

220°C corona-resistant and oil-resistant flat enameled copper wire; high structural strength

High slot fill factor, low losses, high temperature resistance, vibration resistance, increased power density

High- & Low-Voltage Transformers

Concentrated electric fields, dense windings, long-term voltage operation, heat accumulation

200°C composite-insulated flat wire for high-power grid transformers; 180°C standard flat wire for residential distribution transformers

Consistent insulation, low partial discharge, low losses, improved heat dissipation, grid-connection compliance

Industrial High-Efficiency & Servo Motors

Continuous 24-hour operation, variable-frequency control, precision motion, high-speed rotation

Low-loss flat enameled copper wire with high structural stability

Improved energy efficiency, lower temperature rise, reduced noise, stable speed performance

Wind Power & Generator Sets

Outdoor operation, temperature fluctuations, vibration, fatigue, grid harmonics

Flat enameled copper wire with fatigue resistance, weather resistance, and low harmonic losses

Long-term operating stability, reduced winding aging, controlled temperature rise, improved reliability

Rail Transit & Specialized Industrial Equipment

Severe vibration and shock, frequent load fluctuations, dust, humidity

High-rigidity, vibration-resistant, damp-heat-resistant and impact-resistant flat wire

Reliable operation under harsh conditions, mechanical stability, resistance to environmental stress

Precision Industrial Control & Energy Storage

High-frequency operation, parameter stability requirements, harmonic interference

Low-loss flat wire with stable electrical parameters and interference-suppression capabilities

Reduced losses, improved grid stability, harmonic suppression, support for energy storage and power-system applications

Flat Aluminum Wire
High-Temperature Flat Enamelled Copper Wire

1. High-Purity Copper Conductor

  • Material: Oxygen-free electrolytic copper, purity ≥99.95%.

  • Electrical Performance: 100% IACS conductivity, low resistivity, high current-carrying capacity.

  • Mechanical Properties: High-temperature creep resistance, fatigue resistance, and deformation resistance.

  • Precision Forming: Controlled width-to-thickness ratio and fillet radius.

  • Application Suitability: Hairpin bending, tight winding, and high-voltage embedding.

2. Multi-Layer Composite Insulation

  • Insulation Systems: Polyester, polyimide, polyamide-imide (PAI), and nano-corona-resistant composite insulation.

  • Thermal Classes: 155°C, 180°C, 200°C, and 220°C.

  • Three-Layer Structure:

    • Base Coat: Enhances adhesion to the conductor.

    • Middle Coat: Provides high-voltage resistance and primary insulation.

    • Top Coat: Improves wear resistance and aging resistance.

3. Key Insulation Performance

  • Uniform and dense varnish film.

  • Reduced pinholes, bubbles, and thickness variations.

  • High-voltage and pulse resistance.

  • High-temperature and hydrolysis resistance.

  • Vibration and wear resistance.

Efficient Conductivity
Efficient Conductivity
High-Frequency Compatibility
Improved Insulation
Improved Packing Density
Space Optimization
Areas of application
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    Do you have the stock of the enameled winding wire?
    Generally the round enameled copper wire/round enameled aluminum wire are running on production every week, so some regular sizes can be at small quantity.