What is the focus on the silicon steel sheet material in the power transformer?

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What is the focus on the silicon steel sheet material in the power transformer?

Since the loss of silicon steel in the alternating magnetic field is small, the power transformer mainly uses silicon steel sheets as magnetic materials. Silicon steel sheets can be divided into hot rolling and cold rolling. Cold rolled silicon steel strips have the advantages of small volume, light weight and high efficiency due to their high magnetic permeability and low loss. The performance of hot rolled silicon steel strips is slightly inferior to that of cold rolled silicon steel strips.

Ordinary EI-type power transformers are made of silicon steel plates into 0.35–0.5mm thick E-type and I-type films. After heat treatment, they are inserted into the winding wire package. These cores are mostly made of hot-rolled silicon steel sheets (silicon-containing). The high quality silicon steel sheets are D41, D42, D43, D301). The core of the ring-type and C-type power transformers is formed by winding a cold-rolled silicon steel strip, wherein the C-type power transformer is formed by heat-treating and varnishing.

The leakage inductance of the power transformer is generated by magnetic flux that does not pass through the primary and secondary coils, and these magnetic fluxes pass through the air to close the magnetic circuit. Enhancing the coupling density between the primary and secondary of the power transformer transformer can reduce the leakage inductance. A good power transformer has a leakage inductance of no more than 1/100 of the primary coil inductance, and a high-fidelity Hi-Fi amplifier output transformer should not exceed 1/500.

One of the important parameters for judging the quality of silicon steel sheets for audio power transformers is the maximum magnetic flux density of silicon steel sheets. Several commonly used high quality silicon steel sheets are as follows: D41–D42, maximum magnetic linear density (unit – GS Gauss) 10000–12000 GS; D43, maximum magnetic flux density 11000–12000 GS; D301, maximum magnetic flux density 12000–14000 GS.