During the mass production of magnets, tolerances and errors can occur with regard to their technical specification. For example, in case of magnetic field-based sensors, defective magnets lead to measurement errors or reduced performance in permanently excited electric drives.
In magnetic field-based position sensors, the position of the magnet is determined using a precisely defined magnetic field curve. If the magnet has errors in magnetization due to production, this negatively affects the achievable accuracy of the position determination. In the application case of highly efficient electric drives, even small parameter deviations of individual magnets lead to a fluctuating torque curve and thus to unsteady running behavior and finally to reduced lifetime. These advanced application examples show the importance of knowing the properties of the magnets used.