Magnetovisual method for monitoring thermal demagnetization of permanent magnets used in magnetostrictive actuators

The design and measuring potential of the latest generation of the magnetic scanner called Magscanner-Maglab System (MMS) was presented. It enabled the fast acquisition of 3D signals from magnetic sensors and their visualization as digitalized magnetic images. This system was used for monitoring of a thermal demagnetization process of permanent magnets. The original method and measurement devices were capable for examination of magnetic, mechanical and thermal defects in cylindrical rods made of NdFeB and non-rare earth components. Effectiveness of the method and device was tested for the reference demagnetized magnet dedicated for magnetostrictive actuators.

Maps of 3D components magnetic field strength of cylindrical NdFeB permanent magnet and scheme of Hall probeFigure optionsDownload as PowerPoint slide