Types of enameled wire

Classification by conductor shape: round wire, flat wire, hollow wire
According to insulating material: acetal enameled wire, polyester enameled wire, polyurethane enameled wire, modified polyester enameled wire, polyesterimide enameled wire, polyesterimide/polyamideimide enameled wire, polyimide enameled wire

Classified according to wire diameter specifications: conventional enameled wire (above 0.6mm in diameter), fine enameled wire (below 0.6mm in diameter)
Classified by insulating paint varieties: acetal, polyester, modified polyester, polyesterimide, polyurethane, polyimide, polyesterimide/polyamideimide, self-adhesive, composite coating
Classified by heat resistance temperature grade: 120 grade (E), 130 grade (B), 155 grade (F), 180 grade (H), 200 grade (C), 240 grade
Classification by use: general purpose enameled wire (ordinary wire), heat-resistant enameled wire, special enameled wire (corona resistance, refrigerant resistance, others)
Classified by conductor material: copper wire, aluminum wire, alloy wire

Introduction to the classification of enameled wire

Product Category: Direct Solderable Polyurethane Enamelled Copper Round Wire QA(UEW)
Grades: 130(B), 155(F), 180(H)
Features: direct welding, easy to dye
Product Category: Nylon Composite Enameled Wire QA/N(UEW/N)
Grades: 130(B), 155(F), 180(H)
Features: good wear resistance, good bending performance
Product Category: Polyester Enamelled Copper Round Wire QZ(PEW)
Grades: 130(B), 155(F)
Features: Good scratch resistance and solvent resistance
Product Category: Polyesterimide Enamelled Copper Round Wire QZY(EIW)
Level: 180(H)
Features: good stability, scratch resistance, solvent resistance
Product Category: Polyesterimide/Polyamideimide Composite Enameled Round Copper Wire Q(ZY/XY)(EI/AIW)
Level: 200(C), 220(C)
Features: high and low temperature resistance, refrigerant resistance, radiation resistance, thermal shock resistance, excellent chemical properties.
Product category: Anti-corona enamelled round copper wire Q(ZY/XY)/200-BP for frequency conversion motor
Level: 200(C)
Features: high temperature resistance, radiation resistance, wear resistance, corona resistance performance.
The structure of enameled wire is divided into two parts: conductor and insulation. According to the conductor material, it can be divided into copper, aluminum, alloy, etc., and according to the shape of the conductor, it can also be divided into round wire, flat wire, hollow wire, etc. According to the insulating material, it is mainly divided into enameled wire, wrapping wire and inorganic insulated wire. Amidoimide paint, aromatic polyimide paint, polyamideimide paint.
Enameled wire in my country is mainly applicable to GBT 6109-2008 for enameled round wire, and GBT 7095-2008 for enameled copper flat wire.
Product name: composed of "temperature index" + "thickness of insulating varnish layer" + "name of insulating varnish" + "enamelled/paper covered wire, etc.", such as: QZY/XY-2/200 means the primer in the national standard (GB) It is polyesterimide, the top coat is polyamide-imide paint, and the enamelled round wire with a grade 2 paint film thickness and temperature rating of 200.
Enameled wire is a main variety of winding wire, which is composed of conductor and insulating layer. After the bare wire is annealed and softened, it is painted and baked many times. However, it is not easy to produce products that meet both standard requirements and customer requirements. It is affected by factors such as raw material quality, process parameters, production equipment, and the environment. Therefore, the quality characteristics of various enameled wires are different, but they all have Mechanical properties, chemical properties, electrical properties, thermal properties four major properties.
The performance of enameled wire is mainly introduced:
Mechanical properties: including elongation, rebound angle, softness and adhesion, scratch paint, tensile strength and other items.
(1) The elongation reflects the plastic denaturation of the material and is used to assess the ductility of the enameled wire.
(2) The springback angle and softness reflect the elastic deformation of the material, which is used to evaluate the softness of the enameled wire.
(3) The toughness of the paint film includes winding and stretching, that is, the allowable stretching deformation of the paint film without breaking when the conductor is stretched and deformed.
(4) The adhesion of the paint film includes sudden tearing and peeling, and mainly evaluates the adhesion of the paint film to the conductor.
(5) The scratch resistance test of the enameled wire paint film reflects the strength of the paint film against mechanical scratches.
Heat resistance performance: including thermal shock and softening breakdown test.
(1) The thermal shock of the enameled wire is the ability of the paint film of the enameled wire to withstand heat under the action of mechanical stress. Factors affecting thermal shock: paint, copper wire, enamelling process.
(2) The softening breakdown performance of the enameled wire is to measure the ability of the paint film of the enameled wire to withstand thermal deformation under the action of mechanical force, that is, the ability of the pressured paint film to plasticize and soften at high temperature. The heat softening and breakdown performance of enameled wire paint film depends on the molecular structure of the paint film and the force between molecular chains.
Electrical properties include: breakdown voltage, paint film continuity and DC resistance test.
(1) The breakdown voltage refers to the ability of the enameled wire paint film to withstand the voltage load. Main factors affecting breakdown voltage: paint film thickness; paint film roundness; curing degree; external impurities in the paint film.
(2) The paint film continuity test is also called the pinhole test, and its main influencing factors are: raw materials; operating process; equipment.
(3) DC resistance refers to the resistance value measured in unit length. Its main influencing factors: (1) degree of annealing; (2) enameled equipment.
Chemical resistance includes solvent resistance and direct solderability.
(1) Solvent resistance. Generally, the enameled wire has to go through the impregnation process after being wound into a coil. The solvent in the impregnation varnish has different degrees of swelling on the paint film, and it is even worse at higher temperatures. The chemical resistance of the enameled wire paint film is mainly determined by the characteristics of the paint film itself. Under certain conditions of the paint material, the enamelling process also has a certain impact on the solvent resistance of the enameled wire.
(2) The direct solderability of the enameled wire reflects the ability of the enameled wire to solder during the winding process without removing the paint film. The main factors affecting direct solderability are: the influence of technology; the influence of paint.