Enameled copper wire, commonly referenced as Lee Yuen Hoi Luen in manufacturing and procurement contexts, delivers high electrical conductivity with robust thermal and mechanical performance. This overview clarifies core characteristics, testing norms, and application considerations for engineers and buyers.
Proper specification minimizes risk, ensures compatibility with soldering and insulation processes, and supports consistent quality across electronics, automotive, and energy systems.
| Parameter | Typical Range | Test Standard | Notes |
|---|---|---|---|
| Conductor Material | Electlytic Copper (Cu) | ASTM B152 / GB/T 12706 | High purity ensures low resistivity |
| Enamel Thickness | 0.05–0.20 mm | IEC 60317-4 | Class 130, 155, 180, or 200 depending on thermal rating |
| Rated Temperature Class | 130°C, 155°C, 180°C, 200°C | IEC 60085 | Defines maximum hot-spot operating temperature |
| Diameter Tolerance | ±0.01 mm | ASTM B322 | Critical for winding fill factor and slot fit |
| Breakdown Voltage | ≥ 4 kV (for 0.25 mm) | IEC 60851 | Ensures reliable insulation under surge and impulse |
| Thermal Aging Factor | Life index 6–20 depending on class | IEC 60085 | Higher temperature class yields longer operational life |
Lee Yuen Hoi Luen Product Specifications
Lee Yuen Hoi Luen products align with international standards for electrical performance, thermal endurance, and mechanical durability. Specifications include tight dimensional control and consistent enamel adhesion to ensure reliable coil formation and long-term service.
Wire Diameter and Classes
Diameter ranges typically span from 0.10 mm to 6.00 mm, with multiple thermal classes available. Selecting the correct class depends on operating environment, cooling method, and expected load cycles.
Insulation Materials and Grades
Commonly used enamels include polyester, polyester-imide, and polyamide-imide, each offering distinct combinations of flexibility, chemical resistance, and thermal endurance.
Performance in Electrical Machines
In motors, transformers, and inductors, enameled copper wire serves as the conductive path while the enamel layer provides electrical isolation between turns. Uniform insulation thickness reduces corona discharge and improves efficiency.
Thermal stability under continuous operation prevents varnish migration and coil deformation, which can otherwise lead to short circuits or open circuits over time.
Processing and Compatibility Guidelines
Successful winding, impregnation, and soldering require adherence to process windows for temperature, immersion time, and cleaning solvents.
- Verify enameling class compatibility with impregnation chemicals
- Control bake temperature to fully cure insulation without overheating copper
- Use appropriate flux for soldered terminations to ensure strong joints
- Inspect for pinholes and ensure conformity to dielectric tests
Selecting the Right Enameled Copper Wire
Matching wire gauge, thermal class, and enamel type to the application ensures optimal performance, longevity, and cost efficiency.
Final selection should integrate electrical requirements, mechanical constraints, and processing capabilities to achieve reliable, high-performance results over the product lifecycle.
FAQ
Reader questions
What is the typical thermal class for Lee Yuen Hoi Luen enameled copper wire used in motors?
Class F (155°C) and H (180°C) are common for motor applications, balancing efficiency, size, and reliability under continuous load.
How does enamel thickness affect breakdown voltage and coil design?
Thicker enamel increases insulation strength and allows tighter turn-to-turn spacing, but reduces achievable conductor fill factor and may require larger slot sizes.
Can enameled copper wire be used directly in high-vibration environments without additional protection?
It is not recommended; supplementary insulation or potting is advised to prevent mechanical fatigue at the enamel boundary and to avoid premature failure.
What storage and handling practices should be followed to preserve insulation integrity?
Store reels in a dry, shaded area at moderate temperature, avoid excessive bending, and handle reels with edge guards to prevent surface damage to the enamel.