Title:
CONTROLLED RADIAL MAGNETIC BEARING DEVICE
Document Type and Number:
WIPO Patent Application WO/1985/005417
Kind Code:
A1
Abstract:
A controlled radial magnetic bearing device, which consists of a revolution number detector (14) for detecting the rotational speed of a rotary shaft (1) with respect to X-axis and Y-axis control circuits 7X, 7Y, which are adapted to control the outputs from X-axis and Y-axis electromagnets provided so as to extend in X- and Y-axis directions which cross each other in a plane extending at right angles to the axis of the rotary shaft (1), by feedback-inputting into the circuits 7X, 7Y the outputs from X-axis and Y-axis position sensors 5X, 5Y which are adapted to detect the displacement of the rotary shaft (1) from a reference position; an X-axis correction circuit 13X composed of a band-pass filter 19X for extracting a frequency component of backward precession from an output from the Y-axis position sensor 5Y, a means 20X for varying an output from the filter in accordance with an output from the detector (14), and an adder means for adding to an output from the X-axis position sensor 5X an output from the means 20X as an output representative of a 90o advancement of the phase of a backward precession frequency output; and a Y-axis correction circuit 13Y having the same construction as the X-axis correction circuit and including a circuit (22) adapted to reverse an output from the X-axis position sensor 5X. This arrangement enables the outputs from the X- and Y-axis control circuits to be attenuated with respect to a backward precession frequency component, and the precession of the rotary shaft (1) to be thereby effectively reduced.
Inventors:
NAKAZEKI TSUGITO (JP)
NANAMI SHOJI (JP)
OKADA KOICHI (JP)
NANAMI SHOJI (JP)
OKADA KOICHI (JP)
Application Number:
PCT/JP1985/000158
Publication Date:
December 05, 1985
Filing Date:
April 02, 1985
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16C39/06; F16C32/04; H02K7/09; (IPC1-7): F16C32/04
Foreign References:
| JPS5881217A | 1983-05-16 |
Other References:
See also references of EP 0185765A4
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