Large-amplitude low-frequency vibrator
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United States of America Patent
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May 12, 1992
Grant Date -
N/A
app pub date -
Feb 12, 1991
filing date -
May 18, 1990
priority date (Note) -
Expired
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Abstract
A vibrator acting in a low frequency vibration domain, for fixing to and applying low frequency vibrations on a frame in a first predetermined direction along an axis X'X. The vibrator comprises: a first structure having cylindrical pole pieces cylindrical about an axis coaxial to said predetermined direction X'X and provided at their peripheries with coils, and at least one means for creating a magnetic field for causing a magnetic flux to be established between the cylindrical pole pieces; a second structure comprising a cylindrical ferromagnetic mass coaxial about the axis X'X and having cylindrical pole pieces whose peripheries are situated facing respective ones of the coils, and enabling magnetic flux to be established through the ferromagnetic mass; radial active magnetic bearings for holding the second structure radially relative to the first structure without making contact therewith; at least one detector for detecting vibrations along the axis X'X; and circuits for servo-controlling the current flowing in the coils as a function of signals delivered at least by the detector.
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