A study on shunt damping performance, current servo response, and energy harvesting analysis for voice coil motors

Electromagnetic shunt damping is a sensorless vibration control method that uses a single voice coil motor (VCM) and may also be used for energy harvesting. If an amplifier is used to control the current of a VCM, the current control law has the same function as a shunt circuit. In this paper, we focus on a current-controlled VCM and propose a new method that analyzes not only the performance of conventional shunt vibration control but also the energy consumption and the servo performance of current. From a numerical example, it was clarified that the energy was consumed without being regenerated if the PI gain with the maximum damping effect was used. There is a trade-off between the damping effect and energy regeneration.