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Insulation of Enameled Wire and Types of Enameld Wire

Update:08-06-2021
Summary: Although described as "enameled", enameled wire is not, in fact, coated with either a layer of enam...
Although described as "enameled", enameled wire is not, in fact, coated with either a layer of enamel paint nor with vitreous enamel made of fused glass powder. Modern magnet wire typically uses one to four layers (in the case of quad-film type wire) of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer. Magnet wireinsulating films use (in order of increasing temperature range) polyvinyl formal (Formvar), polyurethane, polyamide, polyester, polyester-polyimide, polyamide-polyimide (or amide-imide), and polyimide. Polyimide insulated magnet wire is capable of operation at up to 250 °C. The insulation of thicker square or rectangular magnet wire is often augmented by wrapping it with a high-temperature polyimide or fiberglass tape, and completed windings are often vacuum impregnated with an insulating varnish to improve insulation strength and long-term reliability of the winding.
Self-supporting coils are wound with wire coated with at least two layers, the outermost being a thermoplastic that bonds the turns together when heated.
Polyurethane Enamel Type - Polyurethane Enamel Wire with code UEW and UEWF has Thermal Capacity of 120°C, 130°C and 155°C has diameter range from 0.08mm to 1.00mm and can be used in Transformers, Meters, Electronic and Communication Devices.
Polyester Enamel Type - This type of Enamel Wire with code PEW has Thermal Capacity of 155°C. The diameter range is 0.08mm to 1.6mm. Polyester Enamel wire can be used in Motors for Household Application and Appliances.
Polyester-imide - Polyester-imide Enamel Wire coded as EIW has Thermal Capacity of 180°C with diameter range from 0.1mm to 1mm. This type of enamel wire are used in High Power Motors.
Polyamide-imide - Polyamide-imide Enamel Wire has code AIW. The Thermal Capacity is 220°C with diameter range from 0.1mm to 1.6mm. This Enamel wire is used in Small Motors and Transformers.
Self-Bonding Polyurethane - Self-Bonding Polyurethane Enamel Wire with code SB UEW has Thermal Capacity of 130°C with diameter range from 0.08mm to 1.2mm used in Communication Apparatus and Small Motors.
Self-Bonding Polyester-imide - Self-Bonding Polyester-imide Enamel Wire with code SB EIW has Thermal Capacity of 180°C. The diameter range is 0.1mm to 0.8mm. Self-Bonding Polyester-imide is used in Magnetic Coils and Deflection York Application.
Polyurethane over coated with polyamide - This type of Enamel Wire with code UEW-NY and UEWF-NY has Thermal Capacity of 130°C and 155°C with diameter range from 0.08mm to 1.6mm used in Small Motors and Transformers.
Polyester overcoated with polyamide - Polyester overcoated with polyamide are coded as PEW-NY and PEWH-NY, has Thermal Capacity of 155°C and 180°C with diameter range from 0.1mm to 1.6mm. This Enamel Wire is used in Small Motors.
Polyester-imide overcoated with polyamide-imide - This type of Enamel Wire with code EIW-AI has Thermal Capacity of 200°C with diameter range from 0.1mm to 1.6mm used in Microwave oven Transformer and Air-con Motors.
Enameled wire types can be quite varied but will include the following features:
uniformity of insulation,
good electrical properties like dielectric strength and insulation resistance,
resistance to mechanical stress,
resistance to chemicals, solvents, and encapsulating varnishes,
thermal resistance
long thermal life.
Any magnet wire should exhibit strong properties in one or more of these features. Each type has its own advantages and disadvantages, the main idea being that an electric current makes a magnetic field. Therefore, operating conditions are critical in selection of wire type for any specific application.Click xinyu-enameledwire.com to learn more information.