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Description of the role of the air-core coil

Introduction of the role of air-core coils

1. Air-core coils are used to make insulated wires for coils or windings in electrical goods. Also known as the winding wire. Electromagnetic wires must meet the needs of a variety of applications and manufacturing skills. The former includes its shape, specification, ability to work at high temperatures for short and long periods of time, as well as severe vibrations in certain occasions and centrifugal forces at high speeds, corona resistance and breakdown at high voltages, and chemical resistance in exceptional atmospheres. Corrosion, etc.; the latter includes the need to satisfactorily stretch, bend and wear during winding and weaving, as well as swelling and corrosion during dipping and drying.

2. The electromagnetic wire can be classified according to its base structure, conductive core and electrical insulation layer. Generally, it is divided into an enameled wire, a wrapped wire, an enamel wrapped wire and an inorganic insulated wire according to the insulating material and the manufacturing method used for the electrical insulating layer. The enameled wire conductor is coated with a corresponding lacquer solution, which is then evaporated by solvent evaporation and the film is cured and cooled. The enameled wire can be divided into red polyester enameled wire, polyesterimide enameled wire, polyamideimide enameled wire, polyimide enameled wire, polyesterimide/polyamideimide enameled wire, corona-resistant enameled wire, and oily according to the insulating paint used. Paint, acetal paint, polyurethane enameled wire, etc. Sometimes classified according to the specificity of their use, such as self-adhesive enameled wire, anti-freeze enameled wire.

3. The earliest enameled wire of the air-core coil is an oily enameled wire made of tung oil. The paint film has poor wear resistance and cannot be directly used to manufacture motor coils and windings. Later, the polyvinyl acetal enameled wire was introduced, and its mechanical properties were greatly advanced. It can be directly used for motor windings, and it is called high-strength enameled wire.

4, followed by the development of weak electric skills, there is a self-adhesive enameled wire, which can be obtained without immersion and baking. However, its mechanical strength is poor, and it can only be used in micro-motors and small motors. In addition, in order to avoid the trouble of removing the paint film first during welding, a straight solderable enameled wire is developed, and the coating film can fall by itself in the high temperature tin bath and the copper wire is simply welded. Due to the increasing use of enameled wire, the demand is becoming more and more serious, and a composite enameled wire has also been launched. The inner and outer paint films are composed of different polymer materials, such as polyesterimide/polyamideimide enameled wire.

5. Wrapped wire A primary type of winding wire. In the early stage, cotton yarn and silk, called yarn wrapped wire and silk covered wire, were used in motors and electrical appliances. Due to the large thickness of the insulation and low heat resistance, most of them have been replaced by enameled wires. It was only used as a high frequency winding wire. In the large and medium-sized winding wires, when the heat resistance grade is high and the mechanical strength is large, the glass fiber covered wire is also used, and the appropriate adhesive paint is used in the manufacture.

6. Core The inductor participates in the core, and the inductance can be added. The Q value of the inductor can be advanced, and the number of turns of the coil can be reduced. Adjusting the core together
The orientation can also change the inductance of the inductor, and then further meet the accuracy requirements of the circuit for inductance.
The core material of the inductor is composed of manganese zinc ferrite or nickel zinc ferrite. There are "E" shape, pot shape, column shape, hat shape, I-shaped,
Rectangular and so on. Some inductors are involved in the core, and the core material is permalloy or silicon steel. For example, in the low frequency choke, it is a silicon steel sheet.

7. Shield The shield of the inductor is designed to reduce the influence of the electromagnetic field of the coil on the external circuit. Together, it is to reduce the influence of the external electromagnetic field on the inductor.
The shield is usually made of iron, its posture is matched with the coil, and the coil is placed between them. The shield needs to be grounded for excellent shielding.

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