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If the magnetic field applied to a magnetic material is increased and then decreased back to its original value, the magnetic field inside the material does not return to its original value. The internal field 'lags' behind the external field. This behaviour results in a loss of energy, called the hysteresis loss, when a sample is repeatedly magnetized and demagnetized. The materials used in transformer cores and electromagnets are chosen to have a low hysteresis loss. Similar behaviour is seen in some materials when varying electric fields are applied (electric hysteresis). Elastic hysteresis occurs when a varying force repeatedly deforms an elastic material. The deformation produced does not completely disappear when the force is removed, and this results in energy loss on repeated deformations.

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14y ago
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10y ago

Hysteresis is the dependence of a system not only on its current environment but also on its past environment. This dependence arises because the system can be in more than one internal state. To predict its future development, either its internal state or its history must be known.[1] If a given input alternately increases and decreases, the output tends to form a loop as in the figure. However, loops may also occur because of a dynamic lag between input and output. Often, this effect is also referred to as hysteresis, or rate-dependent hysteresis. This effect disappears as the input changes more slowly, so many experts[who?] do not regard it as true hysteresis.

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Hysteresis losses occur in the magnetic circuits of Transformers and other electrical machines, and is a function of the material used in the manufacture of the magnetic circuit. It represents the energy required to magnetise and demagnetise a sample of that ferromagnetic material.

'Soft' ferromagnetic materials, such as silicon steel, are easily magnetised and demagnetised and have relatively-low hysteresis losses, whereas 'hard' ferromagnetic materials are relatively difficult to magnetise and demagnetise, and have relatively-high hysteresis losses.

Hysteresis losses are represented by the area of the hysteresis 'loop' created when a material's flux density is plotted against changes in magnetising force over one complete cycle of magnetising current; the larger the area, the greater the hysteresis loss.

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9y ago

Hysteresis is an output's dependence on both current and historical input. This is necessary because the current state is affected by historical inputs.

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Q: What is hysteresis loss?
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Can you measure hysteresis loss for diamagnetic materials?

what is hysteresis losses


Does a diamagnetic substance exhibit hysteresis loss?

No


Formula of Hysteresis loss and Eddy current loss?

hysteresis loss = N1/N2 R2/R1 C1/A1 (area of the loop)(vertical sensitivity) (horizontal sensitiivity


Causes of hysteresis loss in transformer?

No, you're hysteresis losses are set by Bmax, frequency, and material. The function is highly nonlinear and the loss goes up disproportionately with Bmax. When designing power transformers, you typically want the hysteresis + eddy losses to equal the copper losses.


What is the Technical meaning of CRGO Lamination?

To minimize hysteresis loss


Why core is made up of silicon steel?

produces magnetic properties,such as small hysteresis area and permeability Hysteresis loss depends upon the material of the core


How do you calculate the Hysteresis loss given a B-H curve?

hysteresis loss= K B^1.6 egs/sec where k is STEINMEITZ coefficient and B is the maximum magnetic flux density


Why armature core is laminated in dc machine?

to reduce the eddy current loss in the machine


Is hysteresis loss considered heat loss?

In general even though energy is lost during hysteresis it is not called as heat losses . Generally I2R losses are called as heat losses because in these tye of only in these energy is lost in the form of real heat


How do you minimize core losses?

Hysteresis and eddy current loss constitute core loss. It can be reduced by replacing solid core by laminated core... by adeeb


Why Soft Iron is suitable for preparing electromagnets?

soft iron B-H curve area is very high and hysteresis loss is proportional to it frequency or no of loop cycles per sec and area of loop so hysteresis loss increases in soft iron as electro magnet


How do you reduce the hysteresis loss?

Hysteresis losses are a function of the magnetic characteristics of the magnetic circuit, so there is very little you can do to minimise hysteresis losses other than to reduce the primary voltage to a transformer if that is at all practicable. These losses are really in the hands of the manufacturers who design and manufacture magnetic circuits.