Why Does The Transformer Core Use A Square Silicon Steel Sheet?

Anti-iron loss. If it is a whole block, the magnetic chain changes will produce eddy currents, and eddy currents will lead to energy loss. As for why is silicon steel material, because silicon steel has a higher permeability and narrower hysteresis lines, magnetic conductive material is not easy to saturate, the same power rating of the transformer volume can be made smaller.
The principle is to reduce the loss, one is eddy current, is the induction of current, silicon steel sheet resistance is large, the current will be small; the second is the hysteresis loss, the narrower the curve envelope area loss is smaller.