Iron core

The commonly used transformer core is generally made of silicon steel sheets. Silicon steel is a steel containing silicon (also known as silicon), with a silicon content of 0.8 to 4.8%. The reason why silicon steel is used as the iron core of a transformer is that silicon steel itself is a magnetic substance with strong magnetic conductivity. In the energized coil, it can generate a greater magnetic induction strength, which can reduce the volume of the transformer.

The iron core is mainly composed of the iron core body, fasteners, and insulating parts:

① The iron core body and magnetic conductor are made of electrical steel sheets.

② Fasteners, clips, screws, glass binding tapes, rigid binding tapes, and cushion blocks.

③ Insulating parts, clamp insulation, insulating pipes and pads, grounding lugs and feet, etc

The actual transformer always works in the AC state, and the power loss is not only caused by the resistance of the coil, but also generated in the iron core magnetized by the alternating current. The power loss in the iron core is commonly referred to as "iron loss", which 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 presence of hysteresis during the magnetization process of an iron core. The magnitude of this loss is proportional to the area surrounded by the material's hysteresis loop. The magnetic hysteresis loop of silicon steel is narrow, and using it as the core of a transformer has a small magnetic hysteresis loss, which can greatly reduce its heating degree.