130/155 class polyester enamelled aluminum (copper) rectangular wire

Enameled aluminum (copper) rectangular wire is made by drawing metals such as copper or aluminum into the required round wire, then drawing or extruding it into a rectangular shape through a die, annealing and softening, and evenly coating the surface with one or more layers of insulating varnish, and then baking and other processes. Compared with common round enameled wires, rectangular wires have a larger surface area and a higher filling factor, which gives it unique advantages in certain applications.

Polyester varnish is a commonly used insulating varnish with good mechanical properties, electrical properties and moisture resistance, but relatively poor heat resistance and solvent resistance. Class 130/155 refers to the temperature resistance grade of the enameled wire, indicating the maximum temperature it can withstand during long-term work.

Among them, class 130 corresponds to grade B in the international standard, with a maximum operating temperature of 130°C. Class 155 corresponds to grade F in the international standard, with a maximum operating temperature of 155°C.

◆ Larger surface area: Compared with round wire of the same cross-sectional area, rectangular wire has a larger surface area, which is conducive to heat dissipation, reducing coil temperature rise and improving the efficiency of electrical equipment.

◆ Higher filling factor: In the same winding space, rectangular wire can be wound with more turns, improving the inductance and performance of the coil, and reducing the volume and weight of the equipment.

◆ Excellent conductivity: The conductor is made of high-purity copper or aluminum, which has excellent conductivity.

◆ Good insulation performance: The insulating paint layer can effectively isolate the current and ensure the safe operation of the equipment.

◆ Good mechanical properties: The paint layer after baking has a certain mechanical strength and can withstand a certain amount of tension and wear.

It should be noted that due to the special shape of the rectangular wire, its winding process is more complicated than that of the round wire, and special winding equipment and processes are required. Polyester enameled rectangular wire is not self-adhesive and needs to be fixed by other means.

Enameled rectangular wire is mainly used in occasions with high requirements for heat dissipation and filling factor.

• Large motors: used for stator and rotor windings of large motors to improve motor efficiency and power density.
• Transformers: used for high-frequency transformers and special transformers to improve transformer performance and efficiency.
• Reactors: used for reactors in power systems to improve reactor performance and stability.
• Welding cables: used for cables in welding equipment to improve cable heat dissipation performance and current carrying capacity.
• Other special coils: used for other coils with high requirements for heat dissipation and filling factor.