Non Oriented Electrical Steel – This steel has uniform magnetic characteristics in rolling and in other directions which is widely used in the iron core materials or rotary machines from large transformers to small electric precision motors. This steel is manufactured without special processing to manage grain orientation. It always carries a silicon measure of 2 to 3.5% and it has similar magnetic properties in all directions, i.e., it can be isotropic. Cold rolled non grain oriented electrical steel is normally abbreviated as Core cutting machine. CRNGO is less costly than CRGO. It really is used when cost is more important than efficiency and for applications 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 should there be 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 commonly used within the manufacturing of large, medium and small-sized transformers, distribution transformers and reactors. This particular electrical steel normally includes a silicon amount of 3 %. It can be processed in a way how the optimum properties are developed in the rolling direction, due to a tight control of the grain orientation in accordance with the sheet. During cold rolling the grains get elongated in one direction and have narrowed in the perpendicular direction. Hence due to the model of the grain it becomes easier for the domains to change polarity back and forth across the elongated direction. The enlargement of grain happens once the steel is heated at temperatures around critical temperature then slow cooling. Larger grains help reducing the losses as a result of hysteresis. The grain size in case there is cut to length 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 really is used for the cores of power and distribution transformers. Cold rolled grain oriented electrical steel is commonly abbreviated as CRGO. CRGO is usually supplied in coil form and it must be cut into “laminations”. These laminations are then used produce a transformer core that is an important part of a transformer. Grain oriented steel is commonly used in large power and distribution transformers and in addition in particular audio output transformers.
Electrical steel is normally coated to enhance electrical resistance between laminations which reduces eddy currents, to supply effectiveness against corrosion and rust and to serve as a dexupky53 during die cutting. There are various coatings, both organic and inorganic. These coatings are utilized according to the use of the electrical steel. The type of coating selected is dependent upon the temperature management of the laminations, whether or not the finished lamination is going to be immersed in oil, along with the working temperature of the finished Transformer core cutting machine. Very early practice was to insulate each lamination having a layer of paper or a varnish coating, but this reduced the stacking factor of your core and limited the highest temperature of your core.