JPH01146014U

JPH01146014U -

Info

Publication number: JPH01146014U
Application number: JP4197488U
Authority: JP
Priority date: 1988-03-31
Filing date: 1988-03-31
Publication date: 1989-10-06

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例を示す断面図、第２
図は制御回路の一例を示すブロツク図、第３図は
本考案における変位量検出の原理を説明するため
の図、第４図は同じく変位速度検出の原理を説明
するための図、第５図は磁束密度Ｂと空隙距離ｇ
との特性の一例を示す図、第６図は従来の５軸制
御形軸受で支持したスピンドルの構造を示す縦断
面図、第７図は第６図の−線矢視断面図、第
８図は第６図の−線矢視断面図、第９図及び
第１０図はそれぞれ従来の所定の電流を固定子コ
イルに通電するための制御回路を示す回路図であ
る。１……回転軸、３……電磁石固定子、４……回
転子ヨーク、５Ａ，５Ｂ，５Ｃ，５Ｄ……励磁コ
イル、７ａ，７ｃ，８ａ，８ｃ……永久磁石、７
ｂ，７ｄ，８ｂ，８ｄ……磁電変換素子、７ｅ，
８ｅ……変位速度検出用コイル、３１……検出回
路、３２……補正回路、３４……変位速度検出回
路。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a block diagram showing an example of a control circuit, Figure 3 is a diagram for explaining the principle of displacement amount detection in the present invention, Figure 4 is a diagram also for explaining the principle of displacement speed detection, and Figure 5 is a diagram for explaining the principle of displacement speed detection. is the magnetic flux density B and air gap distance g
FIG. 6 is a vertical sectional view showing the structure of a spindle supported by a conventional five-axis control type bearing, FIG. 7 is a sectional view taken along the - line in FIG. 6, and FIG. 6 is a cross-sectional view taken along the - line arrow in FIG. 6, and FIGS. 9 and 10 are circuit diagrams each showing a conventional control circuit for supplying a predetermined current to a stator coil. 1... Rotating shaft, 3... Electromagnetic stator, 4... Rotor yoke, 5A, 5B, 5C, 5D... Excitation coil, 7a, 7c, 8a, 8c... Permanent magnet, 7
b, 7d, 8b, 8d... magnetoelectric conversion element, 7e,
8e... Displacement speed detection coil, 31... Detection circuit, 32... Correction circuit, 34... Displacement speed detection circuit.

Claims

[Scope of utility model registration request]

A rotor yoke made of magnetic material that is fixed to the rotating shaft, an electromagnetic stator that is fixed to the casing and equipped with an excitation coil, a displacement sensor that detects the displacement of the rotating shaft, and an output signal from the displacement sensor. and a control circuit for controlling a magnetic attraction force acting between a rotor yoke and an electromagnetic stator based on the magnetic bearing device, wherein the displacement sensor is disposed between a portion of the electromagnetic stator around which an excitation coil is wound. A magnetic bearing device characterized in that it includes a permanent magnet and a magnetoelectric conversion element that generates an electric signal corresponding to magnetic flux density.