Large-amplitude low-frequency vibrator

Details Large-amplitude low-frequency vibrator Large-amplitude low-frequency vibrator

1991-02-12

1992-05-12

Williams, Hezron E.

Measuring and testing

Vibration

Vibrator

310 51, G01N 2900, H02K 709

Patent

active

051116979

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.

REFERENCES:
patent: 4675563 (1987-06-01), Goldowsky
patent: 4947067 (1990-08-01), Habermann et al.
Patent Abstract of Japan, vol. 7, No. 165 (M-230), Jul. 20, 1983 and JP-A-58-071 003 (Daini Seikosha), Apr. 27, 1983.

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