Commonly used low iron loss EI lamination cores are usually made of silicon steel sheets. Silicon steel is a silicon-containing steel with a silicon content of 0.8 to 4.8%. The core of the transformer made of silicon steel is because silicon steel itself is a magnetic material with strong magnetic permeability. In the energized coil, it can generate a large magnetic induction intensity, which can reduce the volume of the transformer.
Since the transformer always operates in an AC state, the power loss generated is due to the coil resistance on the one hand and to the iron core under the alternating current magnetization on the other hand. Generally, the power loss in the low iron loss EI lamination core is called "iron loss", and the iron loss is caused by two reasons, one is "hysteresis loss" and the other is "eddy current loss".
Hysteresis loss refers to the iron loss caused by the hysteresis in the magnetization process of the low iron loss EI lamination core. The magnitude of this loss is proportional to the area enclosed by the hysteresis loop of the material. Moreover, the hysteresis loop of silicon steel is narrow, and the core hysteresis loss of the transformer is small, which can greatly reduce the degree of heat generation.