To wind a transformer, we must have a certain understanding of the materials related to the transformer. For this reason, I will introduce this knowledge.
1. Core material: The core material used in the transformer mainly consists of iron sheet, low silicon wafer and high silicon wafer. The addition of silicon in the steel sheet can reduce the conductivity of the steel sheet and increase the resistivity, which can reduce the eddy current and reduce the loss. . We usually refer to the silicon-added steel sheet as silicon steel sheet. The quality of the silicon steel sheet used for the quality of the transformer has a great relationship. The quality of the silicon steel sheet is usually expressed by the magnetic flux density B. Generally, the B value of the black iron sheet is generally 6000-8000, low silicon wafer is 9000-11000, high silicon wafer is 12000-16000,
2, the commonly used materials for winding transformers are enameled wire, sandbag wire, wire wrapped wire, the most commonly used enameled wire. For the requirements of the wire, the conductive property is good, the insulating paint layer has sufficient heat resistance, and has a certain corrosion resistance. In general, it is best to use the Q2 model of high-strength polyester enamel.
3. Insulation material In the wound transformer, the isolation between the coil frame layers and the isolation between the windings are all made of insulating materials. The general transformer frame material can be made of phenolic paperboard, and the interlayer can be isolated by polyester film or telephone paper. Yellow wax cloth can be used for isolation between the windings.
4. Impregnating material: After the transformer is wound, the last process is to dip the insulating varnish, which can enhance the mechanical strength of the transformer, improve the insulation performance and prolong the service life. Under normal circumstances, cresol varnish can be used as the impregnation. material. There is also this: The transformer is a device that converts the AC voltage, current and impedance. When an AC current is passed through the primary coil, an AC flux is generated in the core (or core) to induce a voltage in the secondary coil (or Current). The transformer consists of a core (or core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the other winding is called the secondary coil.