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Amorphous Rolled Transformer Core

Over the past several thousand years, the metals or alloys used by the human beings are all those materials with crystalline structure, where the atomic three - dimensional space is provided with ordered arrange to form a periodic lattice structure.
 
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Amorphous alloy


Over the past several thousand years, the metals or alloys used by the human beings are all those materials with crystalline structure, where the atomic three - dimensional space is provided with ordered arrange to form a periodic lattice structure.


When the amorphous alloy is rapidly cooled from the liquid state, because it can not crystallize in time and then will remain the liquid atoms in the condensed state of disordered arrangement at room temperature or low temperature, the atoms will not be arranged in long - range ordered, periodical and ruled state but in long – range disordered state. The birth of amorphous alloys is also known as a revolution in metallurgy materials science.


The amorphous alloy is provided with a lot of unique properties such as excellent magnetic properties,  high strength, hardness and high resistivity and so on. The new material used for transformer core can provide high saturation magnetic flux density, low coercive force, low loss (equivalent to1 / 3 to 1 / 5 of the silicon steel sheet), low exciting current and good temperature stability.


Processing technology of the amorphous alloy core


It can ultimately gain a very low loss value to adopt the amorphous alloys with prominent magnetic properties as the core materials for manufacturing the transformer. However, many properties of the material itself can also provide particular characteristics for the amorphous alloy core in the manufacturing process, which are mainly reflected in the following aspects:


● Cutting

Amorphous alloys materials are very hard and it is quite difficult to cut with conventional tools, so it should be taken in account to reduce the shear volume in the design.


● Stacking

The monolithic of the amorphous alloy is extremely thin and the surface of the material is not very flat, then the core fill factor is quite low.


● Molding

Amorphous alloys are very sensitive to the mechanical stress, so it is necessary to take special tightening measures in the production process.


● Annealing

In order to obtain excellent low loss characteristics, annealing must be done to the amorphous alloy core, which is the core technology of the whole process.


Structural features


● The three - phase and five - column amorphous core is suitable to produce Dyn11 connection group transformer. The core size is designed to retain the existing physical size of the amorphous core in the current market, able to meet the assembly technology, equipment and capacity requirements of the existing amorphous alloy transformer possessed by the customers.


● Advanced distributed stack structure is adopted in the core connector design, where the size E is at least 7% less than that of the commonly used amorphous core in the current market, effectively reducing the overall size of the transformer.


● The excitation power of the core is low, able to significantly reduce the noise of the transformer in operation.

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