Autotransformer, as the name suggests, is a type of transformer that can
self couple. Its internal structure is relatively simple, mainly composed of an
iron core and a winding. This winding is divided into two parts: one is a common
winding, and the other is an independent winding. When AC current passes through
the common winding, an alternating magnetic field is generated in the iron core,
which further induces the electromotive force in the independent winding,
thereby achieving voltage transformation.
Compared with traditional dual winding transformers, the uniqueness of
autotransformers lies in the fact that their common winding and independent
winding are connected in series. This design makes the required number of
winding turns and wire cross-sectional area for autotransformers to transmit the
same power relatively small, thereby reducing manufacturing costs and
losses.
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