Out of the two core losses, the hysteresis loss is the dominant one but up to a frequency level that depends on the performance of the cores, beyond which eddy current loss predominates. The eddy current losses in the inductors increases exponentially while the hysteresis loss increases linearly with the increase in frequency and flux. Ferrite Core Inductor LossesĮlectronic engineers prefer to use ferrite core inductors because of the losses they exhibit and their dependence on frequency levels.
They contribute in producing electronic circuits of superior quality. Thus, ferrite core inductors boast of high inductance as compared to other inductors with air cores.Īlso, inductors are a major type of passive linear circuit element besides capacitors and resistors. Usually, the permeability level in the ferrite core inductors ranges between 1400 to 15,000, depending on the type of ferrite material used. It leads to an increase in their magnetic field and inductance. Using Ferrite cores in inductors helps to improve the performance of the inductors by providing high permeability to the coil. While using ferrite cores in inductors, we consider the following things. These currents circulate within the inductors alongside the closed-loop of electric current.įerrite core inductors are used in a range of electric circuit applications including power conversion, broadband, and interference suppression. When these solid metal cores are used in inductors, the changing magnetic field exhibits large eddy currents because of the electrical conductivity of the metal. Inductors that are manufactured with a ferrite core inside their coil are Ferrite core inductors. In this article, we’re going to share with you some important information about ferrite core inductors, their characteristics, and their applications. Therefore, ferrite core inductors are popular and considered a better way out to avoid this problem. However, ferrite core inductors have a fixed value, high permeability, and high inductance. The air core and iron core inductors carry low inductance, minimal frequency operations, and higher losses. Usually, there are three types of inductors seen in the market. Hence, inductors oppose any change in current passing through them. When electricity flows into this coil from left-to-right direction, a magnetic field is generated in the clockwise direction.
They are made using an insulated wire wound into a coil. Thus, the number of turns of the coil will be 26.Inductors are an electronic component that store electrical energy in a magnetic field when electrical current passes through. Thus substituting the values in the above equation You will have to find the number of turns of the coil. The diameter of the coil is 1 inch and the coil length is given by 1.25 inches. Suppose you want to make an inductor which produces an inductance of 10 μH. Remove the insulation from the coil ends.Now apply a thin layer of epoxy over the coil surface for mechanical support.After the winding is complete, slowly withdraw the core without disturbing the coil.The winding must be tight and adjacent turns must be as close as possible.The coil must be first wounded on a plastic former of the adequate diameter (equal to the required core diameter).The value of ‘l’ is multiplied by two if the value of ‘n’ is increased up to 40%. Thus the value ‘l’ is multiplied four times if the value of ‘n’ is doubled. As shown in the equation, inductance of the air-core inductor varies as the square of the number of turns.The length of the coil used in the inductor should be equal to or 0.4 times the diameter of the coil.‘l’ is the length of the coil specified in inches.‘d’ is the diameter of the coil from one wire centre to another wire centre.Where’ L ‘ is the inductance in Micro Henries.The inductance of an air cored inductor can be represented using the simplified formula shown below and to calculate the inductance of an air-core inductor, the same equation may be used.
With a little practice and patience you can construct almost all air cored inductors at home.