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Question:

why the core of a transformer needs to be cold roll grain oriented?

what is meant by this ‘cold roll grain orientation‘?

Answer:

I think it reduces hysteresis and maybe increases relative permeability. What gives a magnetic material the ability to concentrate a magnetic field is all the tiny, movable magnetic domains within the material lining up along with the applied field, and adding to it. Some of the domains can get stuck after the field is removed, causing hysteresis(residual magnetization). And the degree to which this happens depends on the mircostructure of the metal. Most metals, unless they're made specifically to be single crystal which is difficult and expensive, are made up of billions or microscopic pieces of pure crystal separated by impurities in the metal. These little crystals are called grains. And the impurities between grains, grain boundaries. The number of domains that are available to move(this is what determines a materials permeability) also depends somewhat on the microstructure of the metal. Atoms act differently at grain boundaries than they do within the grain. And the orientation of the crystal within the grain makes a difference as well. The way a metal is worked changes the grain structure, maybe from short fat grains to long thin grains, fore eample. And crystals with random orientations to more organized orientations.
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It doesn't have to be, but some magnetic material perform better if they are grain oriented.

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