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Hysteresis

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The hysteresis is an important fundamental property that is present in behavior that have magnetic materials . There are many applications in which hysteresis can be observed in everyday life and it is applied in various fields such as electromagnetism , electrical engineering and even economics .

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What is hysteresis?

It is known as hysteresis to the capacity or tendency that a certain material has to be able to preserve one of its properties when there is no type of stimulus that has produced it. This term was coined by Alfred Ewing .

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  • Definition
  • features
  • Magnetic hysteresis
  • Hysteresis cycle
  • Hysteresis curve
  • Hysteresis losses
  • Instrumentation
  • Applications
  • Importance

Definition

Hysteresis is a term used to refer to the tendency of a certain material to be able to preserve one of the properties it possesses due to the absence of the stimulus that generated it. It is a word that comes from the Greek language and that etymologically speaking means retarded . When we speak of hysteresis, we refer to the ability of the material to be subjected to a certain deforming force not to recover its initial shape at the same speed with which it was changed or in the same way.

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features

Among the most important characteristics of hysteresis are the following:

  • It is considered as a phenomenon related to inertia .
  • It offers the materials resistance to changes.
  • It has a tendency to be able to conserve materials.
  • Its curve is proportional to the loss of power .
  • It has a curve that can show the magnetization of a certain material.

Magnetic hysteresis

This term is applied in the field of physics and refers to the phenomenon that makes it possible to store information in a magnet located on a hard or flexible disk of computers. This field includes in its interior a small magnet that is coded as 0 to 1 and this coding refers to the absence of the field .

In the field of physics , magnetic hysteresis occurs when a ferro-magnet is magnetized, which manages to maintain the magnetic signal when the magnetic field that caused it is removed . In electrical engineering , the term refers to the delay that occurs in induction with respect to the field that causes it.

Hysteresis cycle

The hysteresis cycle occurs in the different magnetic materials that exist and has the ability to show the dependence of magnetic induction in terms of intensity in the magnetic field , in other words, it is the one that can show the dependence of magnetic induction.

This cycle has a construction principle which, to be formulated, must have the following important aspects:

  • New curve
  • Induction development when field is removed
  • Demagnetization curve
  • Magnetization curve
  • Remanence
  • Field intensity
  • Intensity values

This cycle is considered as a way of showing the late reaction of a system to changes in its state compared to a previous one. This process occurs at generally during the observation and study of a material determined focusing on one particular feature. The material is subjected to a certain stimulus that is repeated cyclically showing the data in a graph in which a closed curve is obtained .

Hysteresis curve

The hysteresis curve occurs when the magnetic flux that exists in a ferromagnetic material is measured as the magnetization force changes. Thanks to it, it is possible to determine several of the most important magnetic properties that are present in a certain material, such as retentivity , residual magnetism or residual flux as it is also known, coercive force , permeability and reluctance .

This term is then related to the amount of magnetic saturation , which is an effect that can be found and observed in magnetic-type materials and that is defined as the state that is reached after any type of increase occurs in a external magnetization field that cannot cause an increase in its magnetization . This effect can be observed in the hysteresis or magnetization curve, as it is also known.

Hysteresis losses

The hysteresis loss is a representation of the loss in terms of energy that manifests itself as heat within the magnetic- type cores . It is important to emphasize that the loss in power is directly proportional to the area shown in the hysteresis curve .

Instrumentation

Although hysteresis generally resides in the instruments rather than in the physical type process to which they are connected, it is possible to detect hysteresis more easily by means of a simple open loop test . Other measurement methods are also important as the self , the gain at rest , the time delay, the dead time and others.

Applications

Some fields where hysteresis can be applied are mentioned below:

  • Electric motors
  • In the field of electrical engineering
  • Thermoplastic polymers
  • In electrical engineering
  • In the field of economics

Importance

The study of hysteresis is of great importance mainly in the field of magnetism and magnets . It is important to recognize it because it is what indicates and represents a loss of energy which is manifested as heat in the magnetic cores.

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