Generating a qualified thinner silicon steel core has certain requirements for equipment and processes.
The temperature of the thinner silicon steel core should not be too high or excessive during annealing. Excessive temperature will affect the insulating coating or cause the lamination to bond.
Generally, the temperature of oriented silicon steel sheets is about 800 degrees, and the annealing temperature of non-oriented silicon steel sheets is about 700 degrees. During annealing, the maintenance atmosphere in the furnace is strictly controlled to be a non-oxidizing atmosphere.
- The principle is that the thinner silicon steel core punched sheets will not be oxidized or carburized, and the surface insulation coating of the electrical steel strip (silicon steel sheet) will not be significantly deteriorated.
- Use a hydrogen-nitrogen mixed gas containing 2-10% hydrogen. Adding a small amount of hydrogen can ensure that the iron core punched sheets are not oxidized. The dew point in the maintenance gas should generally be below 0°C.
Thinner silicon steel cores will be used in transformers and transformers operating in the frequency range of 400Hz~30KHz. For a long time, thinner silicon steel cores have been widely used in radar pulse transformers or high-frequency medical X-ray power supplies and linear accelerator modulated power supplies, as well as dust removal and water treatment power supplies.
The thinner silicon steel core has a relatively high magnetic induction intensity, a relatively large output power of the core, and a small size; the high-frequency loss is very low, and the operating power consumption of the core at high frequency is relatively small, and the temperature rise is also very small. Low. The cutout can be kept flat without slag falling off, and the no-load current is also relatively small.
For thinner silicon steel cores used in transformers, cold-rolled silicon steel sheets with a thickness of 0.35 mm are generally chosen. According to the required dimensions of the thinner silicon steel cores, they are cut into long sheets and then overlapped to form a " The glyph "日" or the glyph "口".
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