Control of vibration energization

摘要

An arrangement to controllably vibrate a resiliently supported body including electromagnetic drive means energizable to vibrate the body, means to control the device means, means to detect the actual vibration of the body, the control means including digital signal processing means to produce a control pulse train representing a required phased difference from the detected vibration to control the energization of the drive means with an independently set phase difference from the detected frequency to sustain the vibration of the body.