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• Time of issue:2022-03-14
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(Summary description)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 iron core materials used in transformers mainly include iron sheets, low silicon chips, and high silicon chips. The addition of silicon to the steel sheet can reduce the conductivity of the steel sheet and increase the resistivity, it can reduce the eddy current and reduce its loss. We usually call the silicon steel sheet added with silicon as the silicon steel sheet. The quality of the transformer has a great relationship with the quality of the silicon steel sheet. 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 6000-8000, low silicon wafer is 9000-11000, high silicon wafer is 12000-16000,
2) Materials commonly used for winding transformers
Enameled wire, yarn covered wire, silk covered wire Paper covered wire is the most commonly used enameled wire. The requirements for the wire are: good electrical conductivity, sufficient heat resistance of the insulating paint layer, and certain corrosion resistance. Under normal circumstances, it is best to use the high-strength polyester enameled wire of the QZ model.
3) Insulating material
In the winding transformer, the isolation between the layers of the coil frame and the isolation between the windings must use insulating materials. The general transformer frame material can be made of phenolic cardboard, epoxy board, or cardboard. Polyester film, telephone paper, 6520 composite paper, etc. can be used for isolation between layers, and yellow wax cloth or imide film can be used for isolation between windings.
4) Impregnation material
After the transformer is wound, the last process is to impregnate the insulating paint, which can enhance the mechanical strength of the transformer, improve the insulating performance, and prolong the service life. In general, cresol varnish 1032, insulating paint or resin paint can be used. etc. as impregnating material.