Title:
【発明の名称】大きい半径を有する回転子をラジアル及びアキシヤル軸受する軸受
Document Type and Number:
Japanese Patent JP3068834
Kind Code:
B2
Abstract:
PCT No. PCT/EP88/01153 Sec. 371 Date Dec. 6, 1990 Sec. 102(e) Date Dec. 6, 1990 PCT Filed Dec. 14, 1988 PCT Pub. No. WO89/12178 PCT Pub. Date Dec. 14, 1989.A bearing for radially and axially holding a rotor with large radial dimensions about a stator has sensors (22-25) for determining tilt angles of the rotor with respect to the stator's X and Y axes, and controllers for generating control currents in control coils (17-20) associated with the stator's X and Y axes. The generated currents depend on the output signal of the sensors and, in combination with permanent magnet rings arranged on rotor, exert moments on the rotor, influencing the tilt angles. The controllers have alternating couplers which disable the connection of the tilt axes generated by gyroscopic effects. The controllers may include proportional-derivitive controllers having a gain which is modified proportionately to the square of the speed of the rotor, and a time constant which changes in inverse proportion to the rotor's speed. The central bearing for the radial movement in the X/Y direction either acts passively as a permanent magnet, or actively, as an electromagnet. In the latter case, the parameters of the controllers can be switched from a "soft" to a "hard" operational mode and vice-versa, either to prevent unbalanced disturbances from affecting the stator, or to provide sufficient rigidity for the position control function, even in the presence of external forces.
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Inventors:
Bechler, ud ielck
Application Number:
JP50033888A
Publication Date:
July 24, 2000
Filing Date:
December 14, 1988
Export Citation:
Assignee:
Teldeix Gezershyaft Mitt Beth Yulenk Tell Haftung
International Classes:
F16C39/06; F16C32/04; (IPC1-7): F16C32/04
Attorney, Agent or Firm:
Toshio Yano (2 outside)