Commonly used transformer cores are generally made of silicon steel sheets. Silicon steel is a kind of steel with silicon content in. 0.8%~4.8%. The core of transformer made of silicon steel is because silicon steel itself is a magnetic material with strong magnetic conductivity. It can produce greater magnetic induction intensity in the current coil, thus enabling the transformer to reduce the volume of the transformer in the AC state [power loss occurs not only in the resistance of the coil, but also in the alternating current. In the iron core under fluidized magnetization. Usually the power loss in iron core is called iron loss, which is caused by two reasons, one is hysteresis loss and the other is eddy current loss.

Hysteresis loss is a kind of iron loss caused by hysteresis in the process of magnetization of iron core. The magnitude of the loss is proportional to the area surrounded by the hysteresis loops of the data. The hysteresis loops of silicon steel are narrow, so the hysteresis loss of iron core used as transformer is smaller and the heating degree can be greatly reduced.

When the transformer works, the flux of alternating current in the coil is of course alternating. The induced current of the changed flux occurs in the iron core. The induced current in the iron core circulates in the plane in the straight direction of the channel, so the eddy current loss also makes the iron core hot. In order to reduce the eddy current loss, the core of transformer is made up of insulated silicon steel sheets, which makes the thirst flow in the narrow loop. The Wuxi ventilation duct passes through a smaller cross section to increase the electric limit of the eddy current circuit. At the same time, the silicon in the silicon steel increases the resistivity of the data and also plays a role in reducing the eddy current.