Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core.

Explain HRGO and CRGO. State benefits of CRGO for manufacturing of core. 
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Answer :

 i) HRGO ( Hot –rolled grain oriented steel): 

* To minimize the size of machine flux density should be high with small magneto motive force (MMF). Due to this iron loss will be less . A ll ferromagnetic material have the crystal line structure which is particular direction along which it offers high permeability.

* So Magnetizing will be simple. Sheath steel which has been rolled, so as to give the orientation to all the crystals is called as the grain oriented steel. Due to the grain orientation hysteresis loss will be less.

* Magnetizing property will be simple.

* For manufacturing hot rolling process is used for the material so called as hot rolled grain oriented steel( HRGO)

ii) CRGO ( Cold –rolled grain oriented steel): 

* The grain orientation of silicon steel is obtained by special techniques named cold rolling

* The process is without any high temperature. So this material is called as the cold rolled grain oriented steel.

* The cost of CRGO is more than HRGO

Benefits of CRGO for manufacturing of core:

 

1. CRGO is generally used for high flux density with small magneto motive force to minimize the size of the machine.

2. Due to less size of the machine iron loss will be less.

3. Permeability is high, so magnetizing will be simple.

4. Due to grain orientation hysteresis loss will be reduces.

5. In CRGO the percentage of iron loss is less than HRGO.

6. Magnetic properties of CRGO material can be regained by heating of that magneticmaterial

7. The Chemical composition of G.O. steel has a higher percentage of silicon which in turn increases the resistance compared to regular steel which reduces eddy currents. 
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