What is grain oriented silicon steel?
Grain oriented electrical steel is an important material in the production of energy efficient transformers and large, high performance generators. In the form of laminated, wound or punched sheets, it is the essential core material of distribution transformers, power transformers and small transformers.
What is the advantage of the grain oriented steel laminations?
Excellent lamination factor leads to better and compact designs and hence low material required. High knee saturation characteristics. Very low level of magnetostriction leads to noise reduction. Enhances ease of winding and improves productivity.
Why is silicon added to electrical steel?
Silicon steel is a soft magnetic material that is used in electrical power transformers, motors and generators. It has a high silicon content of about 3.2 mass %, which increases the electrical resistivity of iron and, therefore, reduces eddy current losses.
What is the difference between CRGO and Crngo?
If good inter-lamination resistance is required, fully processed material can be purchased with core plate. Semi processed electrical steel CRGO products are generally given a lower-temperature decarburizing anneal after the final cold rolling.
Where is CRGO used?
It is used for the cores of power and distribution transformers, cold-rolled grain-oriented steel is often abbreviated to CRGO. CRGO is usually supplied by the producing mills in coil form and has to be cut into “laminations”, which are then used to form a transformer core, which is an integral part of any transformer.
How does Silicon Steel reduce hysteresis loss?
And as we know that using silicon steel increases the magnetic permeability, we can also say that using silicon steel reduces the hysteresis loss. The silicon added in the silicon steel increases the electrical resistivity i.e. reduces the conductivity and thus reduces the eddy currents loss.
What is silicon used for in steel?
Silicon increases strength and hardness but to a lesser extent than manganese. It is one of the principal deoxidizers used in the making of steels to improve soundness, i.e. to be free from defects, decays or damages. Silicon is present in all steels to a certain extent.
What is the composition of steel and silicon steel?
C) Steel 93% and Silicon 7%.
What is difference between grain oriented and non grain oriented steel?
Grain orientation Electrical steel made without special processing to control crystal orientation, non-oriented steel, usually has a silicon level of 2 to 3.5% and has similar magnetic properties in all directions, i.e., it is isotropic. Cold-rolled non-grain-oriented steel is often abbreviated to CRNGO.
What are magnetic steel laminations?
Motor laminations are created by using electrical steel laminations. Silicon Steel, also known as electrical steel, is steel with silicon added to it. Adding silicon to steel increases its electrical resistance, improves the ability of magnetic fields to penetrate it, and reduces the steel’s hysteresis loss.
What is called grain oriented laminations?
Grain-oriented laminations are cold rolled laminations specially annealed to orient the iron crystals, that is, the grains in a uniform way in the direction of rolling to get very high permeability and low hysteresis loss.
What is CRGO and its application?
When to use nongrain oriented silicon steel?
This can be shown in the figure below. The grain-oriented steel is not used in rotating electrical machines in which the magnetic field is in the plane of sheets but the angle between the magnetic field and rolling direction keeps changing. For this purpose nongrain oriented silicon steel is used.
What is the grain orientation of electrical steel?
Grain orientation. Grain-oriented electrical steel usually has a silicon level of 3% (Si:11Fe). It is processed in such a way that the optimal properties are developed in the rolling direction, due to a tight control (proposed by Norman P. Goss) of the crystal orientation relative to the sheet.
Why is electrical steel coated with lamination coating?
Lamination coatings. Electrical steel is usually coated to increase electrical resistance between laminations, reducing eddy currents, to provide resistance to corrosion or rust, and to act as a lubricant during die cutting. There are various coatings, organic and inorganic, and the coating used depends on the application of the steel.
Why does grain oriented steel have better magnetic properties?
Because of the crystal structure in which grains align, Grain Oriented steel possesses vastly superior magnetic properties in the rolling direction.