Deviation in magnetization direction (Angle error)

It is usually required for the magnets for sensors to have a high bond of their geometry with the magnetization direction, so-called angle error, thus an angle deviation of the magnetization direction from the geometric axis of the magnet. This bond fundamentally influences the function of some devices, e.g. when the magnet position is monitored by the system of Hall probes or relays and when deviation in the magnetic field direction by mere 1 degree from the geometric axis of the magnet can cause the late closing or closing of a wrong part of the circuit resulting in a failure or even an accident. All the causes of this phenomenon result from the manufacturing process of permanent magnets - concentricity of the pressing direction and the magnetic field is not secured when the block of magnet material is being pressed while the magnetic field is concurrently present or when the final magnets are being cut from the block which can be improperly clamped and its deviation during cutting results in a deviation of the geometric axis from the magnetization axis.

Measurement of deviation in magnetization direction

For this purpose, we are equipped with our own instrument that is able to measure an angular deviation of the magnetization direction from the geometric axis of the magnet, thereby ensure the correct function of the given application. The measurement principle consists in evaluating the direction of propagation of the magnetic flux density vectors at certain distances from the magnet. This measurement is only suitable for double-pole magnetized magnets so far.

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