Magnets are widely used in industrial equipment, electronic products, automotive components, advertising materials and many other applications. However, different magnets have different magnetic properties, and understanding these properties is essential when selecting the right magnetic material for a specific application.
Several important parameters are commonly used to evaluate permanent magnets, including maximum energy product, remanence, coercive force and surface magnetic field. In addition, magnetic materials can be classified into soft magnetic materials and hard magnetic materials according to their magnetization and demagnetization characteristics.
In this article, Dowell Magnet explains the fundamental magnetic properties of magnets, introduces the main types of magnetic materials and explores the characteristics of flexible ferrite magnets.
The maximum energy product, commonly written as (BH)max, represents the maximum product of magnetic flux density (B) and magnetic field strength (H) on the demagnetization curve of a permanent magnet.
It is an important indicator of a permanent magnet's ability to provide magnetic energy. Generally, a higher maximum energy product means that a smaller volume of magnetic material can provide a comparable magnetic energy output under suitable magnetic circuit conditions.
The maximum energy product is commonly expressed in kJ/m³ or MGOe.
This parameter is particularly important when designing compact magnetic systems, such as permanent magnet motors, generators and certain speaker components, where magnetic performance and available installation space are important considerations.
Remanence, also called residual magnetic flux density, is the magnetic flux density remaining in a magnetic material after it has been magnetized to saturation or near saturation and the external magnetizing field is reduced to zero.
It is commonly represented by Br and measured in tesla (T) or millitesla (mT).
Remanence indicates how much magnetic flux density a permanent magnet retains after the external magnetizing field is removed. In general, a higher remanence can contribute to stronger magnetic output, although actual performance also depends on the magnet's shape, dimensions, magnetic circuit and other magnetic properties.
For manufacturers and buyers, Br is an important specification when comparing different grades of permanent magnets.
Coercive force measures a permanent magnet's resistance to demagnetization.
When a magnet has been magnetized, an opposing magnetic field can be applied to reduce its magnetization. The reverse magnetic field required to bring the magnetic flux density or intrinsic polarizat
Previous： Flexible Ferrous Sheet: Features, Applications and Buying Guide
Next：
