Why are silicon steel sheets to be insulated from each other in transformers?
Or, the core uses surface insulation, silicon steel thickness of 0.35 or 0.5mm lamination forming (to reduce the ferromagnetic material S, and then increase the eddy current resistance), can effectively prevent eddy current. In addition, the cross section area of the ferromagnetic material becomes smaller after the silicon steel sheet (the total area is basically constant), which leads to the induced eddy electromotive force decrease, and the eddy current loss is reduced in general according to P=U^2/R.
Wo Liu: due to loss of ferromagnetic material (such as silicon steel sheet) is usually a conductive body, when the coil passes through the alternating current, the core flux changes, induced eddy current in the core (Wo Liu), Wo Liu will produce heat dissipation, known as the Wo Liu loss. To prevent eddy current losses, silicon can be added to the steel to increase the resistance of the material (increasing the resistivity of the ferromagnetic material);
The resistance is directly proportional to the resistivity, inversely proportional to the equivalent cross-sectional area of the material.
Reduce swirl. Ferromagnetic materials produce eddy currents in the magnetic field, consuming electricity and generating heat. When the silicon steel sheets are insulated from each other, the eddy current is limited to a single silicon steel sheet and does not converge into larger eddies.
