Transformers, which are electrical devices used to transfer energy between two or more circuits through electromagnetic induction, can be classified based on their core construction into two main types:
Core Type Transformer: In this type, the primary and secondary windings are wound around two separate limbs or legs of a magnetic core. The core typically has an E-shape or I-shape when viewed from the front. The windings are wound over the central leg and the two outer legs, maximizing the magnetic coupling between the windings. Core type transformers are commonly used for medium- and low-voltage applications.
Shell Type Transformer: In this type, the primary and secondary windings are wound around a central limb or leg of the magnetic core, and the two outer limbs or legs of the core form a closed magnetic loop, enclosing the central limb. The core shape resembles a shell or a cylindrical shape. Shell type transformers are often used for high-voltage applications, as their design provides better mechanical stability and can accommodate higher voltages.
Both core type and shell type transformers have their own advantages and disadvantages, and their suitability for specific applications depends on factors such as voltage levels, power ratings, physical size constraints, and efficiency considerations.