JPH0412006U

JPH0412006U -

Info

Publication number: JPH0412006U
Application number: JP5346890U
Authority: JP
Priority date: 1990-05-22
Filing date: 1990-05-22
Publication date: 1992-01-31

Description

[Brief explanation of the drawing]

第１図は本考案の第１の実施例を示す概略構成
図、第２図は同第２の実施例を示す制御回路の概
略構成図であり、第３図は従来例を示す第１図相
当図である。図面中、１１……回転軸、１２ａ，１２ｂ……
電磁石、１３……検出器、１４，２４……制御回
路、１５……位相補償回路、１６ａ，１６ｂ……
バイアス回路、１７ａ，１７ｂ……加算回路、１
８ａ，１８ｂ，２８ａ，２８ｂ……正の整流回路
、１９ａ，１９ｂ……負の整流回路、２０ａ，２
０ｂ……合成回路、２１，２６……修正回路、２
２ａ，２２ｂ……電力増幅器、２３ａ，２３ｂ…
…励磁コイル、２５，２７ａ，２７ｂ……反転回
路を示す。 FIG. 1 is a schematic block diagram showing a first embodiment of the present invention, FIG. 2 is a schematic block diagram of a control circuit showing the second embodiment, and FIG. 3 is a diagram showing a conventional example. This is a corresponding diagram. In the drawings, 11... rotating shaft, 12a, 12b...
Electromagnet, 13...Detector, 14, 24...Control circuit, 15...Phase compensation circuit, 16a, 16b...
Bias circuit, 17a, 17b...addition circuit, 1
8a, 18b, 28a, 28b...Positive rectifier circuit, 19a, 19b...Negative rectifier circuit, 20a, 2
0b...Synthesis circuit, 21, 26...Modification circuit, 2
2a, 22b...power amplifier, 23a, 23b...
...Exciting coil, 25, 27a, 27b... Inverting circuit is shown.

Claims

[Scope of utility model registration request]

one or more sets of electromagnets arranged in pairs to face each other across the rotating shaft to hold the rotating shaft in a non-contact state, and a detector for detecting the amount of displacement of the rotating shaft from a predetermined position; a phase compensation circuit for converting a detection signal from the detector into a phase-compensated displacement signal; a bias circuit for applying a predetermined amount of attraction force to the electromagnet; A control signal that is the sum of the bias signal and the displacement signal is given to the electromagnet on the side that is separated by the displacement, thereby increasing the attractive force, and a control signal that is the difference between the bias signal and the displacement signal is given to the other electromagnet. and a control circuit for reducing the attractive force by applying a control circuit to the pair of electromagnets, in which the magnitude of the displacement signal exceeds the magnitude of the bias signal due to the rotation shaft being displaced outside the predetermined range. and a correction circuit that adds the difference as a correction signal to the attraction force of the electromagnet on the side from which the rotating shaft is separated, and controls the attraction force of the other electromagnet to be zero. Control device.