Amorphous metal transformer
type of transformer
An amorphous metal transformer (AMT) or amorphous core transformer is a type of energy efficient transformer found on electric grids. The magnetic core of this transformer is made with a ferromagnetic amorphous metal. The typical material (Metglas) is an alloy of iron with boron, silicon, and phosphorus in the form of thin (e.g. 15-25 μm) foil rapidly cooled from melt. These materials have high magnetic susceptibility, very low coercivity and high electrical resistance. The high resistance and thin foils lead to low eddy currents losses when subjected to alternating magnetic fields. On the downside amorphous alloys have a lower saturation induction and often a higher magnetostriction compared to conventional crystalline iron-silicon, grain oriented electrical steel.
Transformer low and high load losses
At a constant power rating, AMTs are more efficient at both low and high loads, though AMT's require a larger core, due to the amorphous material's lower saturation induction and higher magnetostriction, and increased winding material resulting in a larger transformer size and weight .
No-Load or Low Load
In a transformer the no-load or low load loss is dominated by the core loss. With an amorphous core, no/low-load core loss can be 70–80% lower than with traditional crystalline materials.
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