Non Oriented Electrical Steel – This steel has uniform magnetic characteristics in rolling and in other directions and it is popular within the iron core materials or rotary machines from large transformers to small electric precision motors. This steel is created without special processing to regulate grain orientation. It always includes a silicon degree of 2 to 3.5% and has similar magnetic properties in all directions, i.e., it can be isotropic. Cold rolled non grain oriented electrical steel is generally abbreviated as cut to length machine. CRNGO is less costly than CRGO. It really is used when expense is more important than efficiency and also for applications the location where the direction of magnetic flux is not constant for instance electric motors and generators with moving parts etc. It could also be used if you find insufficient space to orient components to take advantage of the directional properties of grain oriented electrical steel.
Grain Oriented Electrical Steel – This type of steel has superior magnetic characteristics toward rolling. This steel is used within the manufacturing of large, medium and small-sized transformers, distribution transformers and reactors. This type of electrical steel normally has a silicon degree of 3 %. It really is processed in such a manner how the optimum properties are created in the rolling direction, due to a tight control over the grain orientation relative to the sheet. During cold rolling the grains get elongated in a direction and have narrowed within the perpendicular direction. Hence due to model of the grain it might be easier to the domains to change polarity backwards and forwards along the elongated direction. The enlargement of grain takes place once the steel is heated at temperatures around critical temperature followed by slow cooling. Larger grains help lowering the losses on account of hysteresis. The grain size in case of transformer core cutting machine is 2 to 5 and in the case of HRGO it can be 5-20. The magnetic flux density is increased by 30% from the coil rolling direction, although its magnetic saturation is decreased by 5%. It can be used for the cores of power and distribution transformers. Cold rolled grain oriented electrical steel is normally abbreviated as CRGO. CRGO is often supplied in coil form and it needs to be cut into “laminations”. These laminations are then used to create a transformer core which happens to be a fundamental element of a transformer. Grain oriented steel is commonly used in large power and distribution transformers plus in particular audio output transformers.
Electrical steel is usually coated to enhance electrical resistance between laminations which reduces eddy currents, to supply potential to deal with corrosion and rust as well as to work as a dexupky53 during die cutting. There are several coatings, both organic and inorganic. These coatings are employed dependant upon the use of the electrical steel. The sort of coating selected is dependent upon the heat management of the laminations, whether or not the finished lamination will be immersed in oil, and the working temperature from the finished Transformer core cutting machine. Very early practice would be to insulate each lamination by using a layer of paper or perhaps a varnish coating, but this reduced the stacking factor of your core and limited the utmost temperature of your core.