Elliptical vibratory apparatus

摘要

An elliptical vibratory apparatus includes first and second controllers; first and second power amplifiers for amplifying outputs of the first and second controllers; first and second vibratory exciters receiving outputs of the first and second power amplifiers for generating first and second vibrational forces in first and second directions; first and second vibrational systems of an elliptical vibratory machine receiving the first and second vibrational forces; and detectors of first and second vibrational displacements for detecting vibrational displacements of a movable part of the elliptical vibratory machine in the first and second direction. A closed loop is formed by the first and second controllers, the first and second power amplifiers, the first and second vibratory exciters, the first and second vibrational systems, and the detectors of the first and second vibrational displacements. The output of the detector of the second vibrational displacement is negatively fed-back to the first controller in the closed loop. Shift angles of the first and second phase shifters are so predetermined that there is a phase difference of 180 degrees between the output terminal of the detector of the second vibrational displacement and the input terminal of the first controller, when these terminals are cut off from each other, and a predetermined phase difference can be obtained between the vibrational displacements of the first and second vibratory systems for the optimum condition of the elliptical vibratory machine. The first vibratory system is self-excitedly vibrated at its resonant frequency and the second vibratory system is self-excitedly vibrated.