Importance

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Abstract

The invention disclosed is an elliptical vibratory apparatus including a first controller which includes at least a first phase shifter, a first high-gain amplifier and a first saturating element; a first power amplifier for amplifying an output of the first controller; a first vibratory exciter receiving an output of the first power amplifier for generating a horizontal vibrational force in a horizontal direction; a horizontal vibrational system of an elliptical vibratory machine receiving said horizontal vibrational force; a vibrational displacement detector for detecting a horizontal displacement of a movable part of the elliptical vibratory machine in the horizontal direction, the output of the vibrational detector being supplied to both the input of the first controller and the input of a second controller; the second controller including at least a second phase shifter, a second high-gain amplifier and a second saturating element; a second power amplifier for amplifying an output of the second controller; a second vibratory exciter receiving an output of the second power amplifier for generating a vertical vibrational force in a vertical direction; a vertical vibrational system of the elliptical vibratory machine receiving the vertical vibrational force; a closed loop being formed by the first controller, the first power amplifier, the first vibratory exciter, the horizontal vibrational system and the vibrational displacement detecting means, the output of the vibrational displacement means being negatively fed-back to the first controller in the closed loop; wherein a shift angle .alpha. of the first phase shifter is so predetermined that there is a phase difference of 180 degrees between the output terminal of the vibrational displacement detector and the input terminal of the first controller, when these terminals are cut off from each other, and a shift angle .beta. of the second phase shifter is so predetermined as to obtain a predetermined phase difference between phase difference between the vibrational displacements of the horizontal and vertical vibrational systems for the optimum condition of the elliptical vibratory machine, the horizontal vibrational system being self-excitedly vibrated at its resonant frequency and the vertical vibrational system being self-excitedly vibrated.

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First Claim