Servo-control system for an unbalanced rotor vibrator
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United States of America Patent
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Dec 30, 2008
Grant Date -
May 31, 2007
app pub date -
Nov 27, 2006
filing date -
Nov 28, 2005
priority date (Note) -
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Abstract
The invention applies to a vibrator comprising two pairs (A, B) of unbalanced rotors (10 to 13) driven in synchronous rotation by a first motor, and a second motor arranged to drive a phase shifter mechanism so as to adjust a phase difference between the first pair of rotors and the second pair of rotors; the system comprises: a sensor (C1) for sensing rotation of a rotor of the first pair of rotors; a sensor (C2) for sensing rotation of a rotor of the second pair of rotors, or for sensing the position of the phase shifter mechanism; means for controlling the rotation of the first motor as a function of the phase and the frequency of a force setpoint signal and as a function of the signals delivered by the sensors; and means for controlling the rotation of the second motor as a function of the phase, the frequency, and the amplitude of the force setpoint signal and as a function of the signals delivered by the sensors.
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