Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1987-12-21
1989-02-21
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318460, 318632, 318651, G05B 101
Patent
active
048068357
ABSTRACT:
The electromagnetic device comprises at least one compensation ring placed in the vicinity of the fluid bearing and mounted relative to the rotor by means of an active radial magnetic bearing whose electromagnet windings are powered as a function firstly of the signals delivered by a position detector for detecting the position of the compensation ring relative to the rotor, and secondly of the signals delivered by at least two vibration detectors disposed on the casing of the machine and having nonparallel sensitivity axes which are perpendicular to the axis of the rotor. The signals delivered by the vibration detectors are applied to a high-gain narrow-band selective feedback circuit whose central frequency is synchronized with a reference frequency fo. The compensation ring is of relatively small mass and serves to exert a rotary compensation force on the rotor via the radial magnetic bearing, which force is equal to the centrifugal force due to the out-of-balance mass of the rotor but which is 180.degree. out of phase relative thereto, thereby reducing casing vibration while expending little energy.
REFERENCES:
patent: 4121143 (1978-10-01), Habermann et al.
patent: 4244629 (1981-01-01), Habermann
patent: 4339780 (1982-07-01), Okubo
patent: 4417772 (1983-11-01), Robinson
patent: 4583031 (1986-04-01), Brunet
patent: 4626754 (1986-12-01), Habermann et al.
patent: 4642500 (1987-02-01), Higuchi et al.
patent: 4697128 (1987-09-01), Matsushita et al.
patent: 4763032 (1988-08-01), Bramm et al.
Dobeck Benjamin
Societe Anonyme: Societe De Mecanique Magnetique
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