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Classification of magnet wire

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  • Add time:2013/5/20 10:07:39
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  • Magnet wire is insulated wire used in the manufacture of electrical products in coil or winding. Also known as winding wire. Magnet wire their basic heart and an electrically insulating layer of conductive wire. Usually based on the electrically insulating layer with an insulating material, and manufacturing methods are divided into the wire, around the envelope, paint enveloping envelope and an inorganic insulating line.

    Enameled wire

    Conductor coated with a corresponding paint solution, curing, cooling by evaporation of the solvent and the film is made. Enameled wire insulating paint they use can be divided into polyester enameled wire, polyester-imide enameled wire, polyamide-imide enameled wire, enameled wire of polyimide, polyester-imide / polyamide-imide enameled wire, corona-resistant enameled wire, and oily paint, the acetal paint, polyurethane enameled wire. Sometimes particularity classified according to their use, such as resistant enameled wire, refrigerant-resistant enameled wire.

    Earliest oily enameled wire, made of tung oil. The film poor wear resistance, can not be directly used in the manufacture of motor coils and windings, need to add the enveloping layer of cotton yarn. Later, polyvinyl formaldehyde enameled wire come out, greatly improved mechanical properties can be used directly in the motor windings, and referred to as high-strength magnet wire.

    With the development of the weak technology resistant enameled wire, you can not dipping, baking for better overall coil. But its poor mechanical strength, only micro motor, small motor. Further, in order to avoid the trouble of removing the film when the first welding, the development of a solderable enameled coating film to fall off leaving the copper tin bath in the high temperature Boring easily welded.

    Due to the increasingly widespread application of enameled wire, an increasingly demanding and also developed a composite enameled wire. Its inner and outer film by the type of polymer material composition, for example, polyester-imide / polyamide-imide enameled wire.

    Around the envelope

    An important species in the winding wire. Early with cotton and silk, known as yarn envelope and silk envelope, has been used in the electrical, electronics. Due to the large thickness of the insulation, the heat resistance is low, the majority have been replaced by the enameled wire. At present only as a high-frequency winding wire. In large and medium-sized specifications winding wire, heat-resistant grade higher mechanical strength, the glass envelope, with appropriate adhesive paint at the time of manufacture.

    Wrap around the envelope lines are still occupied a certain position, mainly used in oil-immersed transformers. At this time the formation of oil-paper insulation has excellent dielectric properties, and low prices, long life. Paper covered wire is oxygen-free copper rod or electric round aluminum rod with certain specification mold extrusion or wire drawing after annealing, in two or more layers of insulating paper wrapped copper (aluminum) conductor (including telephone paper, cable paper, high voltage cable paper, turn-to-turn insulation, etc.) winding wire, suitable for oil-immersed transformers and other electrical winding line. NOMEX paper covered wire by the oxygen-free copper rod or electric round aluminum rod with certain specification mold extruded wire, and then by the U.S. company DuPont NOMEX insulating paper wrapping from the winding wire, mainly used in transformers, welding machines winding electromagnets or other similar electrical equipment products. By the extrusion process for the production of electrical bare copper (aluminum) wire wrap line for the production of cables is the ideal material.

    Relatively rapid development in recent years is the film around the envelope, polyester film and polyimide film wrapping line.

    Recently, there are the mica tape package polyester-imide film covered copper flat wire for wind power generation.

    Inorganic insulating line

    When the heat-resistant grade requirements go beyond the limits of organic materials, usually inorganic insulating paint coating. The existing inorganic insulated wire can be further divided into a line of a glass film, the oxide film lines and ceramic wire.