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Amorphous steel is limited to foils of about 50 μm thickness. The mechanical properties of amorphous steel make stamping laminations for electric motors difficult. Since amorphous ribbon can be cast to any specific width under roughly 13 inches and can be sheared with relative ease, it is a suitable material for wound electrical transformer cores.
The stacking factor (also lamination factor or space factor [1]) is a measure used in electrical transformer design and some other electrical machines. It is the ratio of the effective cross-sectional area of the transformer core to the physical cross-sectional area of the transformer core. The two are different because of the way cores are ...
The solid core of the rotor is built with stacks of electrical steel laminations. The figure shows one of many lamination sets used. The rotor lamination has a larger number of slots than its corresponding stator lamination, and the number of rotor slots should be a non-integer multiple of the number of stator slots to prevent magnetic ...
Later designs constructed the core by stacking layers of thin steel laminations, a principle that has remained in use. Each lamination is insulated from its neighbors by a thin non-conducting layer of insulation. [30] The transformer universal EMF equation can be used to calculate the core cross-sectional area for a preferred level of magnetic ...
Silicon steel has low hysteresis loss, and the laminated construction prevents eddy currents from flowing in the core, which dissipates power in the resistance of the steel. The efficiency of typical distribution transformers is between about 98 and 99 percent. [8] [9] Where large numbers of transformers are made to standard designs, a wound C ...
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Here the lower saturation magnetization of amorphous cores tends to result in a lower efficiency at full load. Using more copper and core material it is possible to compensate for this. So high efficiency AMTs can be more efficient at low and high load, though at a larger size.
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