Abstract
Electro-magnetic actuators have potentials of sensor-less vibration control due to the abilities of simultaneous actuation and sensing. This paper discusses a method of the electro-magnetic shunt damping with a digital virtual impedance circuit realizing a resistor or a resistor-capacitor circuit optimally designed by a theory of tuned mass damper. The digital virtual impedance circuit, which consists of a controlled voltage source and a computer, can realize arbitrary impedance. Using the virtual impedance concept, the optimally tuned resistive component which might have negative value can be realized, even though the conventional passive electro-magnetic shunt damping technique suffers from performance degradation due to the inherent resistance of the coli. The experimental results demonstrate the effectiveness of the proposed method. From the analysis of the open-loop transfer function, we also discuss the stability margin of the system and the suitability of the virtual impedance applied to the electro-magnetic shunt.
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