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BH curve simulation

An essential property of magnetic materials that defines how they react to variations in magnetic fields is the BH curve, commonly referred to as the hysteresis loop. When a magnetic material is exposed to a changing magnetic field, the connection between magnetic field intensity (H) and magnetic flux density (B) is shown on the curve. For engineers and scientists working with magnetic materials, understanding the BH curve is essential since it offers useful knowledge about the material's magnetic characteristics. In this article, we'll explore how BH curve simulations can help us better understand magnetic materials and their behaviour.

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Electric motors, transformers, and magnetic sensors are just a few of the applications that utilise magnetic materials like iron and steel. These materials get magnetised when exposed to a magnetic field, producing a magnetic flux density that is measured in tesla (T). This magnetization process is driven by the magnetic field strength, expressed in amperes per metre (A/m) units.


For a certain magnetic material, the relationship between magnetic field strength and magnetic flux density is described by the BH curve. As the curve is a loop, H and B do not have a linear connection. The magnetic material gets increasingly magnetised and the magnetic flux density rises as the magnetic field intensity rises. The magnetic flux density does not return to zero when the magnetic field is lowered because the magnetic material still maintains part of its magnetization. The loop in the BH curve is a representation of this hysteretic activity.

Why BH curve simulation

Simulating the BH curve allows us to understand how a magnetic material will behave under different magnetic field conditions. The performance of magnetic materials in many applications may be predicted using this knowledge, which is essential for developing and improving magnetic devices. The BH curve may be simulated using a variety of techniques, such as analytical, numerical, and experimental ones.

The BH curve is modelled using mathematical equations in analytical ways. These calculations are based on the magnetic material's physical characteristics, such as its coercivity and magnetic susceptibility. The complexity of the magnetic material and the assumptions included in the model have an impact on how accurately analytical approaches can forecast the BH curve.

Tools to model BH curve

The BH curve is simulated using computer models in numerical approaches. Finite element analysis (FEA) or other numerical techniques may serve as the foundation for these models. As they can take into consideration the intricate geometry of the magnetic material as well as the effects of eddy currents and other electromagnetic processes, numerical simulations may provide a more thorough knowledge of the BH curve. Numerical simulations, however, may be computationally costly and often need for specialised technology and software.

Experimental methods involve measuring the BH curve directly using a magnetometer or other magnetic measurement instrument. The most accurate and trustworthy statistics are obtained using this method, although it may be time- and money-consuming.

BH curve simulations may provide important insights into the behaviour of magnetic materials, regardless of the technique utilised. Engineers may, for instance, use simulations to improve the design of magnetic devices by determining the magnetic properties of various materials and geometries. The effects of temperature, mechanical load, and other variables on the BH curve may also be investigated using simulations.

Importance in research

The BH curve not only has useful uses but also has basic scientific importance. For the creation of novel materials and technologies as well as for the advancement of our knowledge of basic physical concepts like electromagnetism, it is essential to comprehend the behaviour of magnetic materials.

BH curve simulations are a crucial tool for engineers and researchers dealing with magnetic materials, to sum up. Simulations may provide useful insights into the behaviour of these materials and aid in the improvement of the design of magnetic devices by simulating the complicated behaviour of magnetic materials under various magnetic field settings. BH curve simulations are a crucial part of the study and development of contemporary magnetic materials, regardless of whether analytical, numerical, or experimental techniques are used.

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