✔ Eddy Current Loss Inductor

Eddy Current Loss Inductor

- March 17, 2018

Thats why coil impedance is a useful concept the real part is resistive ec while the imaginary part is inductive. Thus it is eliminated by entirely removing the core instead of using air core inductor.

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Core loss hysteresis eddy current loss hysteresis loss eddycurrentloss2 2 4 fig 4.

Eddy current loss inductor. Eddy current loss is due to heating of the core by circulating currents that are induced in the iron core by the magnetic field around the turns of the coil. Eddy current loss when an alternating magnetic field is applied to a magnetic material an emf is induced in the material itself according to faradays law of electromagnetic induction. Most of these losses occur due to parasitic capacitance skin effect proximity effect core loss eddy current loss etc.

Since the rate of change of flux is directly proportional to the applied voltage the power loss due to eddy currents increases as the square of the applied inductor voltage and directly with its pulse width. Inductors with ferromagnetic cores experience additional energy losses due to hysteresis and eddy currents in the core which increase with frequency. Hysteresis loss is due to power that is consumed in reversing the magnetic field of the inductor core each time the direction of current in the inductor changes.

These currents are called eddy currents and circulate within the iron core only. The eddy current loss is directly proportional to the frequency. The power loss is proportional to the area of the loops and inversely proportional to the resistivity of the core material.

Since the magnetic material is a conducting material these emfs circulate current within the body of the material. By making the core nonconductive. How can you minimize the effect of an eddy current in an inductor.

The power loss in the core due to eddy currents is. The eddy currents in the metal traces arise from the magnetic field generated by the device that penetrates the metal layers. Ohmic losses in the metal traces as well as eddy current losses.

This power loss is proportional to the square of the rate of change of flux in the core. In the case of a 50 or 60hz transformer the steel is made in thin sheets that are then coated with an insulating coat of varnish before being assembled into a transformer. This is because eddy cuurents ecs at the surface of the core flow in phase with the coil current while the induced emf due to inductance is out of phase.

Typical b h curve of a magnetic material with sine wave excitation b h 4b accurate estimation of losses of power inductor in power electronics applications ranjith bramanpalli wurth elektronik eisos waldenburg germany. At high currents magnetic core inductors also show sudden departure from ideal behavior due to nonlinearity caused by magnetic saturation of the core. Reistive and induvtive effects are separate.

Eddy current losses can be reduced by making the core out of thin laminations which have an insulating coating or alternatively making the core of a magnetic material with high electrical resistance like ferrite. Most magnetic cores intended for power converter application use ferrite cores for this reason.