Terms in magnetism
Temperature and time characteristics
With increasing temperature the magnetisation of all ferromagnetic materials decreases towards zero, the same also applies to permanent magnets.
více informacíMagnetisation methods
For a permanent magnet to perform its function, it is necessary to magnetise it after manufacture. The magnetic field intensity should reach at least three times the coercivity of the given material. Materials with a lower Hc value can only be magnetised after assembling the whole circuit. This can ensure the optimisation of the working point of the magnet.
více informací
Magnetic circuit
A permanent magnet is often used in a magnetic circuit consisting of the magnet and pole shoes from a magnetically soft material, most frequently iron. This will ensure the optimum shaping of the poles and the air gap.
více informací
Basic terminology
Materials used for permanent magnets are referred to as a whole as "magnetically hard materials". Their basic magnetic property is an ability to retain a significant magnetic polarisation J even after the termination of the effect of an external magnetic field. The overall magnetic induction B in a material is given by the equation.
více informací