How eddy current is related to frequency?

Relation between frequency dependence of eddy current loss and switching characteristics of square-loop core. Abstract: It is shown that the reversal time versus excess applied field curve of a square-loop core is equivalent to the relationship between eddy current loss per cycle and frequency at B m = B s .

Which loss is proportional to square of frequency?

Hysteresis losses are proportional to the electrical frequency and the eddy current losses are proportional to the square of the electrical frequency.

Which electrical quantity is directly proportional to the eddy current?

Thus the name eddy current is given. The eddy current losses are directly proportional to the square of laminations thickness. For this reason, the laminations are designed as thin as possible.

What is high frequency eddy current?

The high-frequency eddy current method (HFEC) is based on the normal eddy current method but works in the higher frequency range of around 100 kHz to 100 MHz. The basic principle is similar to classic eddy current techniques. There circling currents are induced, the so called Eddy Currents.

How eddy current losses can be reduced?

Eddy current magnitude can be reduced by designing the core as a set of thin sheets or laminations, in parallel to the magnetic field. Each sheet must be insulated from its neighbours with a thin coating of varnish or oxide film. By laminating the core, the area of each section and hence the induced EMF is reduced.

How do hysteresis and eddy current loss depends on frequency?

As the flux density or flux is constant for a given voltage and frequency, eddy current loss and hysteresis loss remain constant at any load. Therefore, in a transformer, hysteresis and eddy current losses depend upon both maximum flux density and supply frequency.

Which of the following loss is proportional to the square of frequency of magnetic reversal?

Hysteresis loss:- The hysteresis loss is proportional to the frequency and the maximum flux density in the air gap. Hysteresis loss occurs in the armature of the d.c. machine since any given part of the armature is subjected to magnetic field reversals as it passes under successive poles.

Is power loss due to eddy current directly proportional to frequency?

As Power loss due to Eddy current is directly proportional to the square of frequency. Eddy current is actually induced by mutual induction phenomenon in the transformer core. And we know emf induced is directly proportional to the rate of change of flux.

What is the relationship between eddy current loss and flux density?

Since the eddy current loss is proportional to the square of the product of supply frequency and flux density, therefore, by controlling the frequency and the flux density the amount of heat can be controlled.

What is the frequency of eddy current used for heating?

Therefore eddy current heating can be restricted to any desired depth of the material to be heated by judicious selection of frequency of the heating current. The supply frequency is usually employed between 10 to 400 kHz.

What determines the magnitude of an eddy current?

The magnitude of eddy current is directly related to the strength of the magnetic field, the rate of change of the magnetic flux, and the area of the coil, while having an inverse relationship to the resistivity of the conductor. As eddy currents flow through the conductor, heat is generated, referred to as Joule heating.