Preferred Direction of Magnetisation
By preferred direction one understands the orientation of the magnet crystals in a certain direction.
In this preferred direction the magnet reaches its highest magnetic value and has to be magnetized in this direction.The preferred direction is obtained by exposing the magnetic powder to a strong external magnetic field. For ring and round magnets, the preferred direction is mostly axial, for square magnets it depends on the height (h) and for segment magnets it is diametric or radial.
Isotropic Magnets
Isotropic magnets have no preferred direction. For this reason it is possible to select any direction and type of magnetisation.
Anisotropic Magnets
Anisotropic magnets are pressed in a magnetic field and have for this reason a preferred direction. They have only in this preferred direction good magnetic properties and can be magnetised only in this direction. At the same magnetic volume a higher magnetic flux is obtained than with isotropic magnets. The remanence is approximately doubled.
Magnets With Axially Preferred Direction
Ring and round magnets are mainly orientated aixally whereas square magnets have their preferred direction through the height.
Magnets With Diametrically Preferred Direction
For special applications, e.g. for motor and pumps the preferred direction is laid diametrically (across the direction of axis)..
Pole Oriented Magnets
For pole-oriented magnets the material is treated according to the multiple pole orientation. These magnets are used mainly in connection with sensors, motor driving mechanisms or generators. The remanence is approximately 1,5 - 2 times compared to the same isotropic magnetic materials..
