Numerical calculation and experimental verification of forces during regulation of permanent magnet

Abstract

Many technical applications (manipulators, actua tors, clamping devices, etc.) take advantage from the fact that the magnetic field strength and thus magnetic holding force of permanent magnets may temporarily be affected (decreased or increased) by suitably oriented external magnetic field. This field is usually generated by an appropriate direct current carrying coil. In this paper, this fact is quantified by numerical analysis and the results are verified by experimental measurement on a real device. The particular attention is given to the dependence of the holding force of the permanent magnet on the excitation current.