[Flat Wire Column] Types and Standards of Enameled Wire

Flat Wire Column

The difference between a flat wire motor and a round wire motor lies in the way the copper wire is formed. The flat wire is conducive to the improvement of the slot fill rate of the motor. Generally, the slot fill rate of the round wire motor is about 40%, while the slot fill rate of the flat wire motor can reach More than 60%. The improvement of the slot full rate means that more copper wires can be filled under the premise of the same space, resulting in stronger magnetic field strength and higher power density.

Enameled wire is a main type of winding wire. It is a wire coated with an insulating varnish layer on the conductor. Because it is often wound into a coil in use, it is also called winding wire.

It is made of a metal conductor as the conductive inner core, and the outer surface is coated with a polymer insulating layer. It is mainly composed of these two parts; it is the conversion of electromagnetic energy into mechanical energy, thermal energy, sound energy, light energy or mechanical, thermal, chemical, sound, light, etc. Functional materials that convert energy into electromagnetic energy.

It is mainly used to realize the conversion of electromagnetic energy in electrical equipment, such as the conversion of electrical energy into kinetic energy, the conversion of kinetic energy into electrical energy, and the conversion of electrical energy into heat energy. Tools, household appliances, automotive appliances, etc. are the main materials used to wind electromagnetic coils. With the explosive growth of new energy vehicles in my country, the research and development and investment in enamelled flat wires have also ushered in new growth points.

The enameled wire industry is currently changing the traditional problems of low industry concentration and widespread low-end products. In the future, it will gradually increase R&D investment in the direction of high-end enameled wire and special enameled wire, and integrate and match with the transformation and upgrading of my country’s manufacturing industry on the raw material side. With the adjustment of China’s industrial structure, it will bring a new round of growth driving force to the enameled wire industry, and at the same time, product quality and industry concentration will also be further improved.

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

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.

In order to adapt to different national conditions in various countries, enameled wires have formulated different standards in different countries. In my country, enameled round wires are mainly applicable to GBT 6109-2008, enameled copper flat wires are applicable to GBT 7095-2008, and American standards mainly refer to MW 1000 -2003 electromagnetic wire, the Japanese standard refers to JIS C 3202-1994, and the International Electrotechnical Commission refers to IEC 60317.

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.

For example: 1EI/AIW/A/200 means that the Japanese standard (JIS) primer is polyesterimide, and the topcoat is polyamideimide grade 1 paint film thickness and temperature grade aluminum wire of 200.

The US model representation method uses a specific specification number to indicate the type of paint film and the specific specification number of the heat level, and the specific specification number should refer to the MW 1000-2003 standard, such as MW 79-C, which means a direct-solderable polyurethane enamelled copper round wire with a heat level of 155 (thin paint film, thick paint film and thicker paint film).