How is the flux density calculated?

In this article, we will see what it is and how the magnetic flux density of magnets and magnetic products is calculated. 

In this article, we will see the density of the magnetic flux. However, before we see how to calculate them, we must first clarify what the flux density means.

A concept synonymous with magnetic flux density is magnetic induction or magnetic field. This is a physical quantity measured in Tesla, the SI unit or Gauss, (10,000 Gauss = 1 Tesla), and indicates how strong a magnetic field is and in which direction it goes. Strictly speaking, flux density describes the area density of the magnetic flux passing through an element. Mathematically, it is a vector, so it is derived from a vector potential. The symbol used to represent is B.

To understand what this means, imagine that a magnet creates a field called B in both its inner and outer environment. Each point in field B can be assigned a certain B field strength. This is calculated as follows.

densidad de flujo magnético


Calculation of field strength B

To calculate the magnetic induction, there are different formulas, which depend on the geometric shapes of the magnet. For a standard magnet with a rectangular shape, the formula is:

 B = F / I * l

As already mentioned, B represents the flux density, F for the force in Newton and I for the current in amperes. l is the length of the conductor in meters. This formula is used for simple magnet formats, and the more complicated ones use computer programs that calculate the data you want in a very short time.

However, if you need magnets and want the exact data, it's easier to talk to one of our subject matter experts. You can tell them your individual application needs and plans, so that our experts can inform and advise them accurately. Do not hesitate to contact us.

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