Many more complex shapes, and even custom designs are possible. Some of the most popular core shapes are toroid, rods, E-cores and blocks. Choosing the most appropriate shape is influenced by a variety of factors including the allowable mounting footprint and volume, the application, radiation limits, size of windings, operating and maximum temperature, and the mounting configuration. The variety of shapes and combinations provide designers with many different options to achieve the best performance in their required footprint. The combination of core and windings, along with the associated electricity passing through the wire, results in inductance, which is the ability of an inductor to store energy and oppose a change in the electric current flowing through it. The magnetic core is usually surrounded by carefully placed windings of wire. Although these core materials are “hard” the cores are referred to as “soft” since they do not retain significant magnetism. That complexity explains why there are so many different offerings of core materials, types of windings, sizes and shapes for a wide range of applications.Īn inductor's core is produced from specially formed “soft” magnetic materials that are able to store energy in the form of a magnetic field when current is flowing through the winding that surround it. Inductors are simple in appearance but behind those seemingly basic designs are multiple iterations of calculations, considerations and trade-off between performance, price and longevity. Core Design Considerations – and how Micrometals FREE Inductor Software makes choosing the right core EASY!
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