JPH03317U - - Google Patents
Info
- Publication number
- JPH03317U JPH03317U JP6011789U JP6011789U JPH03317U JP H03317 U JPH03317 U JP H03317U JP 6011789 U JP6011789 U JP 6011789U JP 6011789 U JP6011789 U JP 6011789U JP H03317 U JPH03317 U JP H03317U
- Authority
- JP
- Japan
- Prior art keywords
- current
- displacement
- rotor
- rotation speed
- current command
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図は同実施例におけるロータの回転
数と乗算値の関係を示すグラフ、第３図は磁気軸
受の一部の構造を示す斜視図、第４図は従来の磁
気軸受の制御回路の構成を示すブロツク図、第５
図は同制御回路の動作を説明するための波形図、
第６図は磁気軸受を真空ポンプに適用した場合の
構成を示す概略構成図である。
Ｍ１，Ｍ２……電磁石、Ｃ１，Ｃ２……コイル
、Ｓ１，Ｓ２……変位センサ、２……ロータ、５
……変位検出回路、６……電流指令信号発生器（
電流指令手段）、７ａ，７ｂ……電流制御回路（
電流制御手段）、９ａ，９ｂ……加算点、１０…
…回転数センサ（回転数検出手段）、１１……乗
算値発生器、１２…乗算器（１１と１２がバイア
ス電流調整手段）。
Fig. 1 is a block diagram showing the configuration of an embodiment of this invention, Fig. 2 is a graph showing the relationship between the rotor rotation speed and the multiplication value in the same embodiment, and Fig. 3 shows the structure of a part of the magnetic bearing. FIG. 4 is a block diagram showing the configuration of a conventional magnetic bearing control circuit, and FIG.
The figure is a waveform diagram to explain the operation of the control circuit.
FIG. 6 is a schematic configuration diagram showing a configuration in which a magnetic bearing is applied to a vacuum pump. M 1 , M 2 ... Electromagnet, C 1 , C 2 ... Coil, S 1 , S 2 ... Displacement sensor, 2 ... Rotor, 5
...Displacement detection circuit, 6...Current command signal generator (
current command means), 7a, 7b... current control circuit (
current control means), 9a, 9b... addition point, 10...
... rotation speed sensor (rotation speed detection means), 11 ... multiplication value generator, 12 ... multiplier (11 and 12 are bias current adjustment means).
Claims (1)
と、前記ロータの前記各電磁石の吸引方向への変
位を検出する一対の変位センサと、前記各変位セ
ンサの出力に基づいて、前記ロータの平衡位置か
らの変位量を検出する変位検出回路と、前記変位
検出回路の出力に応じて前記各コイルに供給すべ
き励磁電流の値を決定する電流指令手段と、前記
電流指令手段から出力された電流指令信号にバイ
アス電流値を加算した信号に基づいて前記各コイ
ルに供給する励磁電流を各々制御する電流制御手
段と、前記ロータの回転数を検出する回転数検出
手段と、前記回転数検出手段の検出結果に基づい
て、前記ロータの回転数が高くなる程、前記電流
指令信号に加算すべきバイアス電流値を下げるバ
イアス電流調整手段とを具備することを特徴とす
る磁気軸受の制御回路。 a pair of electromagnets that attract the rotor in opposite directions; a pair of displacement sensors that detect the displacement of the electromagnets of the rotor in the attraction direction; a displacement detection circuit that detects the amount of displacement of the displacement detection circuit; a current command means that determines the value of the excitation current to be supplied to each of the coils according to the output of the displacement detection circuit; and a current command signal output from the current command means. current control means for controlling the excitation current supplied to each of the coils based on a signal obtained by adding a bias current value to the current value; a rotation speed detection means for detecting the rotation speed of the rotor; and a detection result of the rotation speed detection means. A control circuit for a magnetic bearing, comprising: bias current adjusting means that lowers a bias current value to be added to the current command signal as the rotational speed of the rotor increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6011789U JPH03317U (en) | 1989-05-24 | 1989-05-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6011789U JPH03317U (en) | 1989-05-24 | 1989-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03317U true JPH03317U (en) | 1991-01-07 |
Family
ID=31587198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6011789U Pending JPH03317U (en) | 1989-05-24 | 1989-05-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03317U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6166541A (en) * | 1984-09-08 | 1986-04-05 | Ntn Toyo Bearing Co Ltd | Controlled radial magnetic bearing device |
| JPS62151626A (en) * | 1985-12-24 | 1987-07-06 | Yaskawa Electric Mfg Co Ltd | Method for controlling attraction of magnetism |
-
1989
- 1989-05-24 JP JP6011789U patent/JPH03317U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6166541A (en) * | 1984-09-08 | 1986-04-05 | Ntn Toyo Bearing Co Ltd | Controlled radial magnetic bearing device |
| JPS62151626A (en) * | 1985-12-24 | 1987-07-06 | Yaskawa Electric Mfg Co Ltd | Method for controlling attraction of magnetism |
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