Zero-power control type vibration eliminating apparatus

Details Zero-power control type vibration eliminating apparatus Zero-power control type vibration eliminating apparatus

1993-08-25

1995-09-12

Stephan, Steven L.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318649, 310 51, F16F 1503

Patent

active

054499852

ABSTRACT:
There is provided a vibration eliminating apparatus utilizing a magnetic suspending system which achieves zero power control. The vibration eliminating apparatus includes a table on which equipment to be installed, magnetic yokes fixed on the table, control magnets for suspending the magnetic yokes from an installation floor, displacement sensors for measuring gaps between the control magnets and the magnetic yokes, power amplifiers for supplying exciting currents to the control magnets, and compensation circuits for controlling the exciting currents of the control magnets by supplying outputs from the displacement sensors to the power amplifiers. Each control magnet includes a permanent magnet for generating a bias magnetic flux and an electromagnet for generating a control magnetic flux to form a magnetic circuit. An integrated value of the exciting current fed to the electromagnet is fed back to the power amplifier.

REFERENCES:
patent: 3650581 (1972-03-01), Boden et al.
patent: 3860300 (1975-01-01), Lyman
patent: 4908536 (1990-03-01), Hudimac
Patent Abstracts of Japan, vol. 14, No. 495 (M-1041) Oct. 29, 1990.
Patent Abstracts of Japan, vol. 14, No. 333 (P-1078) Jul. 18, 1990.
Patent Abstracts of Japan, vol. 13, No. 253 (P-883) Jun. 13, 1989.
Eisenhaure et al., "Magnetic Bearing for Precision Linear Slides", pp. 67-79, date unknown.
Hiyama et al., "Magnetic Bearing", EBARA JIHO, No. 138 (1987-7), pp. 7-11, Sep. 1987.

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