Damping of machine frame vibrations by an electro-magnetic actuator

Abstract

In the paper the use of permanent magnet with coil for transversal vibration control of a flexible slender beam is analysed. The magnetic flux is varied due to external harmonic excitation. The so induced alternating voltage drives alternating current through a closed electric circuit. The induced current driven through the coil generates magnetic force, which counteracts the excitation force and so damps the vibration. The internal losses in the coil influence the overall system's performance. A model of the system is derived in a simplified, linearised form. The extent of introduced damping is assessed. © Springer International Publishing Switzerland 2014.