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Eddy Current Losses

According to Faraday’s Law of Electromagnetic induction, inside a material, an e.m.f (Electro-MagneticField) is induced or generated when an alternating magnetic field is applied to a magnetic material. Within the materials body, these emf’s circulates because the magnetic material is a conducting material. When there is a magnetic field change is experienced inside a conductor current is induced, which is known as Eddy Current. Those lossesthat  are induced or generated because of these currents are known as Eddy current losses. One of the main drawbacks of these losses isthat they generate a huge amount of heat or in simple words, they increase the temperature of the magnetic material.

There are mainly two methods for reducing the eddy current losses, which include:

  1. By reducing the eddy current magnitude.
  2. By using a magnetic material having a higher value of resistivity like silicon steel and many more.

Hysteresis Losses

When a material or core experienced the work done because of the magnetizing force beside the inner friction of magnet molecules, this friction produces heat and the energy in the form of heat is known as Hysteresis Loss.

There are few methods of reducing the hysteresis losses, out of whom the best method is the use of a material having minimal hysteresis loop area, like silicon steel.

The other names of hysteresis losses and the eddy current losses are iron losses or core losses or magnetic losses.

Table 2.1: Es = 1 .73 f Bm
B m f (in hz) f (in hz) f (in hz) f (in hz)
30 40 50 60
0.4 20.76 27.68 34.6 41.52
0.6 31.14 41.52 51.9 62.28
0.8 43.09776 55.36 69.2 83.04
1 51.9 69.2 86.5 103.8
1.2 62.28 83.04 103.8 124.56



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