Non Oriented Electrical Steel – This steel has uniform magnetic characteristics in rolling and then in other directions and is widely used within the iron core materials or rotary machines from large transformers to small electric precision motors. This steel is produced without special processing to manage grain orientation. It usually carries a silicon level of 2 to 3.5% and has similar magnetic properties in all directions, i.e., it really is isotropic. Cold rolled non grain oriented electrical steel is generally abbreviated as cut to length machine. CRNGO is cheaper than CRGO. It really is used when pricing is more valuable than efficiency as well as for applications the location where the direction of magnetic flux will not be constant by way of example electric motors and generators with moving parts etc. It is also used if you find insufficient space to orient components to make use of the directional properties of grain oriented electrical steel.
Grain Oriented Electrical Steel – This particular steel has superior magnetic characteristics in the direction of rolling. This steel is utilized in the manufacturing of large, medium and small-sized transformers, distribution transformers and reactors. This sort of electrical steel normally has a silicon level of 3 %. It really is processed in such a way that the optimum properties are created in the rolling direction, caused by a tight control over the grain orientation in accordance with the sheet. During cold rolling the grains get elongated in just one direction and obtain narrowed from the perpendicular direction. Hence due to model of the grain it becomes easier for that domains to alter polarity back and forth across the elongated direction. The enlargement of grain occurs when the steel is heated at temperatures around critical temperature then slow cooling. Larger grains help lowering the losses because of hysteresis. The grain size in the event of transformer core cutting machine is 2 to 5 and in the case of HRGO it is 5-20. The magnetic flux density is increased by 30% from the coil rolling direction, although its magnetic saturation is decreased by 5%. It is used for the cores of power and distribution transformers. Cold rolled grain oriented electrical steel is usually abbreviated as CRGO. CRGO is usually supplied in coil form and it needs to be cut into “laminations”. These laminations are then used produce a transformer core which is a fundamental element of a transformer. Grain oriented steel is utilized in large power and distribution transformers plus in particular audio output transformers.
Electrical steel is generally coated to boost electrical resistance between laminations which reduces eddy currents, to provide resistance to corrosion and rust as well as act as a dexupky53 during die cutting. There are numerous coatings, both organic and inorganic. These coatings are utilized based on the use of the electrical steel. The particular coating selected depends upon the temperature treatment of the laminations, regardless of if the finished lamination will probably be immersed in oil, along with the working temperature of the finished Transformer core cutting machine. Very early practice would be to insulate each lamination with a layer of paper or a varnish coating, but this reduced the stacking factor from the core and limited the maximum temperature in the core.