The transformer

Abstract

The action of a transformer is a particular case of the principle of mutual inductance, and a transformer consists essentially of two windings, the primary and secondary on a common magnetic core. A transformer will be of either core-type or shell-type construction, and typical forms of construction are shown in Figs. 4.1 and 4.2. It can be seen from Figs. 4.1 and 4.2 that for a core-type construction the primary and secondary windings are wound as a pair of concentric coils on each limb, whereas for a shell-type construction the primary and secondary windings form interleaved layers on a single limb. In all cases, the core will be of laminated construction in order to reduce iron losses to a minimum.