ABSTRACT
The main purpose of the core is to contain the magnetic flux and create a well-defined, predictable path for the flux. This flux path, and the mean distance covered by the flux within the magnetic material, is defined as the Magnetic Path Length. There are two types of construction for magnetic cores, core type and shell type. Magnetic cores are made of three basic materials. The first is bulk metal, the second is powdered materials, and the third is ferrite material. The magnetic materials used for tape cores and laminations are coated with an insulating material. The insulating coating is applied to reduce eddy currents. Laminations are available in scores of different shapes and sizes. The punch press technology for fabricating laminations has been well-developed. One of the most important parameters in transformer steels is permeability. Any stress or strain of the magnetic materials will have an impact on the permeability.
