JPH0833162B2 - Device for detecting displacement of rotating body in magnetic bearing device - Google Patents
Device for detecting displacement of rotating body in magnetic bearing deviceInfo
- Publication number
- JPH0833162B2 JPH0833162B2 JP62170677A JP17067787A JPH0833162B2 JP H0833162 B2 JPH0833162 B2 JP H0833162B2 JP 62170677 A JP62170677 A JP 62170677A JP 17067787 A JP17067787 A JP 17067787A JP H0833162 B2 JPH0833162 B2 JP H0833162B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- detector
- displacement
- rotating body
- magnetic bearing
- 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.)
- Expired - Fee Related
Links
Landscapes
- Rolling Contact Bearings (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、磁気軸受装置における回転体の変位検出
装置、さらに詳しくは、たとえば磁気軸受装置のロータ
軸または筒状のロータなどの回転体の変位を検出する装
置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a displacement detecting device for a rotating body in a magnetic bearing device, and more specifically, for detecting displacement of a rotating body such as a rotor shaft or a cylindrical rotor of the magnetic bearing device. It relates to a detecting device.
従来の技術とその問題点 磁気軸受装置の回転体の変位検出装置として、第５図
に示すように、インダクタンス検知式非接触変位検出器
（１）と、この検出器（１）の出力を正または負の値に
全波整流する絶対値回路（２）と、検出器（１）の出力
から検出器発振周波数f1を除去するために絶対値回路
（２）の出力から検出器発振周波数f1の２倍の周波数f2
以上を除去するローパスフィルタ（３）と、増幅器
（４）とを備えたものが知られている。なお、ローパス
フィルタ（３）において検出器発振周波数f1の２倍の周
波数f2以上を除去するのは、検出器（１）の出力を全波
整流することにより絶対値回路（２）の出力に検出器発
振周波数が２倍になってあらわれるからである。2. Description of the Related Art As a displacement detecting device for a rotating body of a magnetic bearing device, as shown in FIG. 5, an inductance detection type non-contact displacement detector (1) and an output of this detector (1) are positive. Or, the absolute value circuit (2) for full-wave rectification to a negative value and the detector oscillation frequency f1 from the output of the absolute value circuit (2) in order to remove the detector oscillation frequency f1 from the output of the detector (1). Double frequency f2
It is known that a low-pass filter (3) for eliminating the above and an amplifier (4) are provided. The low pass filter (3) removes the frequency f2 or more that is twice the detector oscillation frequency f1 by detecting the output of the absolute value circuit (2) by full-wave rectifying the output of the detector (1). This is because the oscillator frequency doubles.
このような従来の変位検出装置の場合、第６図に示す
ようなローパスフィルタの特性により、その遮断周波数
fsを検出器発振周波数f1の２倍の周波数f2よりかなり低
い値に設定する必要があり、遮断周波数fs以上で周波数
f2以下の領域でゲインが下り、かつ位相遅れが生じる。
このため、回転体が高速回転するときには、その回転周
波数領域でゲインが下りかつ位相が遅れることになり、
高速回転体の変位を正確に検出することが困難になる。In the case of such a conventional displacement detection device, due to the characteristics of the low pass filter as shown in FIG.
It is necessary to set fs to a value considerably lower than the frequency f2 which is twice the detector oscillation frequency f1.
In the region of f2 or less, the gain decreases and the phase delay occurs.
Therefore, when the rotating body rotates at high speed, the gain is lowered and the phase is delayed in the rotation frequency region,
It becomes difficult to accurately detect the displacement of the high-speed rotating body.
この発明は、上記の問題を解決し、高速回転体の変位
も正確に検出できる磁気軸受装置における回転体の変位
検出装置を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a rotor displacement detection device in a magnetic bearing device that can accurately detect displacement of a high speed rotor.
問題点を解決するための手段 この発明による磁気軸受装置における回転体の変位検
出装置は、変位検出器の出力を正または負の値に全波整
流する絶対値回路と、遮断周波数が変位検出器の発振周
波数の２倍以上に設定されたローパスフィルタと、遮断
周波数が変位検出器の発振周波数の２倍に設定されたノ
ッチフィルタとが直列に接続されていることを特徴とす
るものである。Means for Solving the Problems A displacement detecting device for a rotating body in a magnetic bearing device according to the present invention includes an absolute value circuit for full-wave rectifying the output of the displacement detector to a positive or negative value, and a displacement detector having a cutoff frequency. Is connected in series with a notch filter having a cutoff frequency set to twice the oscillation frequency of the displacement detector.
作用 ローパスフィルタの遮断周波数が検出器発振周波数の
２倍以上に設定されているので、絶対値回路の出力から
検出器発振周波数の２倍を越える高周波ノイズのみが除
去され、ノッチフィルタの遮断周波数が検出器発振周波
数の２倍に設定されているので、ローパスフィルタの出
力からさらに検出器発振周波数に２倍の周波数成分のみ
が除去される。したがって、ノッチフィルタの出力は検
出器の出力から検出器発振周波数成分と高周波ノイズの
みが完全に除去されたものとなり、検出器発振周波数以
下の周波数領域ではゲインも位相も変化しないため、高
速回転体で変位が正確に検出される。Action Since the cutoff frequency of the low-pass filter is set to more than twice the detector oscillation frequency, only the high-frequency noise that exceeds twice the detector oscillation frequency is removed from the output of the absolute value circuit, and the cutoff frequency of the notch filter becomes Since it is set to twice the detector oscillation frequency, only the frequency component twice the detector oscillation frequency is removed from the output of the low-pass filter. Therefore, the output of the notch filter is the output of the detector with only the detector oscillation frequency component and high-frequency noise completely removed, and neither the gain nor the phase change in the frequency region below the detector oscillation frequency. The displacement is accurately detected by.
実施例 第１図はこの発明の実施例を示し、磁気軸受装置にお
ける回転体の変位検出装置は変位検出器（10）、絶対値
回路（11）、ローパスフィルタ（12）ノッチフィルタ
（13）および増幅器（14）を備えている。Embodiment FIG. 1 shows an embodiment of the present invention, in which a displacement detecting device for a rotating body in a magnetic bearing device comprises a displacement detector (10), an absolute value circuit (11), a low pass filter (12), a notch filter (13) and It is equipped with an amplifier (14).
変位検出器（10）、絶対値回路（11）および増幅器
（14）は従来例のものと同様である。The displacement detector (10), the absolute value circuit (11) and the amplifier (14) are the same as those in the conventional example.
ローパスフィルタ（12）の遮断周波数fsは、第２図に
示すように、検出器発振周波数f1の２倍の周波数f2以上
に設定されている。ノッチフィルタ（13）の遮断周波数
fnは、第３図に示すように、検出器発振周波数f1の２倍
の周波数f2に設定されている。As shown in FIG. 2, the cutoff frequency fs of the low pass filter (12) is set to a frequency f2 which is twice the detector oscillation frequency f1 or more. Cutoff frequency of notch filter (13)
As shown in FIG. 3, fn is set to a frequency f2 that is twice the detector oscillation frequency f1.
絶対値回路（11）の出力をローパスフィルタ（12）に
通すことにより、第２図に示すように、周波数f2以上で
ゲインが小さくなり、さらに大きい周波数f3以上の高周
波ノイズが除去されるが、周波数f2以下ではゲインおよ
び位相は変化しない。このローパスフィルタ（12）の出
力をさらにノッチフィルタ（13）に通すことにより、第
４図に示すように、これから周波数f2成分のみが除去さ
れる。したがって、ノッチフィルタ（13）の出力は検出
器（10）の出力から検出器発振周波数f1成分と高周波ノ
イズのみが完全に除去されたものとなり、周波数f1以下
の周波数領域ではゲインも位相も変化しない。このた
め、高速回転の変位が正確に検出される。By passing the output of the absolute value circuit (11) through the low-pass filter (12), as shown in FIG. 2, the gain becomes small at the frequency f2 or higher, and the high frequency noise at the frequency f3 or higher is removed. The gain and phase do not change below the frequency f2. By passing the output of the low-pass filter (12) through the notch filter (13), only the frequency f2 component is removed therefrom, as shown in FIG. Therefore, the output of the notch filter (13) is obtained by completely removing only the detector oscillation frequency f1 component and high frequency noise from the output of the detector (10), and neither the gain nor the phase changes in the frequency region below the frequency f1. . Therefore, the displacement of the high speed rotation is accurately detected.
発明の効果 この発明の磁気軸受装置における回転体の変位検出装
置によれば、上述のように、検出器の出力から検出器発
振周波数と高周波ノイズのみを完全に除去して、変位信
号のみを取出すことができ、したがって、高速回転体の
変位を正確に検出することができる。Effects of the Invention According to the displacement detecting device for a rotating body in the magnetic bearing device of the present invention, as described above, only the detector oscillation frequency and the high frequency noise are completely removed from the output of the detector, and only the displacement signal is extracted. Therefore, it is possible to accurately detect the displacement of the high speed rotating body.
第１図はこの発明の実施例を示す磁気軸受装置における
回転体の変位検出装置のブロック図、第２図はローパス
フィルタの周波数特性図、第３図はノッチフィルタの周
波数特性図、第４図はローパスフィルタとノッチフィル
タを合わせた周波数特性図、第５図は従来例を示すブロ
ック図、第６図はローパスフィルタの周波数特性図であ
る。 （10）……変位検出器、（11）……絶対値回路、（12）
……ローパスフィルタ、（13）……ノッチフィルタ。FIG. 1 is a block diagram of a rotor displacement detecting device in a magnetic bearing device showing an embodiment of the present invention, FIG. 2 is a frequency characteristic diagram of a low-pass filter, FIG. 3 is a frequency characteristic diagram of a notch filter, and FIG. Is a frequency characteristic diagram in which a low-pass filter and a notch filter are combined, FIG. 5 is a block diagram showing a conventional example, and FIG. 6 is a frequency characteristic diagram of the low-pass filter. (10) …… Displacement detector, (11) …… Absolute value circuit, (12)
...... Low-pass filter, (13) …… Notch filter.
Claims (1)
整流する絶対値回路と、遮断周波数が変位検出器の発振
周波数の２倍以上に設定されたローパスフィルタと、遮
断周波数が変位検出器の発振周波数の２倍に設定された
ノッチフィルタとが直列に接続されていることを特徴と
する磁気軸受装置における回転体の変位検出装置。1. An absolute value circuit for full-wave rectifying the output of a displacement detector to a positive or negative value, a low-pass filter whose cutoff frequency is set to twice or more the oscillation frequency of the displacement detector, and a cutoff frequency A displacement detecting device for a rotating body in a magnetic bearing device, wherein a notch filter set to twice the oscillation frequency of the displacement detector is connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62170677A JPH0833162B2 (en) | 1987-07-07 | 1987-07-07 | Device for detecting displacement of rotating body in magnetic bearing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62170677A JPH0833162B2 (en) | 1987-07-07 | 1987-07-07 | Device for detecting displacement of rotating body in magnetic bearing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6415519A JPS6415519A (en) | 1989-01-19 |
| JPH0833162B2 true JPH0833162B2 (en) | 1996-03-29 |
Family
ID=15909341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62170677A Expired - Fee Related JPH0833162B2 (en) | 1987-07-07 | 1987-07-07 | Device for detecting displacement of rotating body in magnetic bearing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0833162B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3591412B2 (en) | 1999-05-31 | 2004-11-17 | 松下電器産業株式会社 | Crushing equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60223067A (en) * | 1984-04-18 | 1985-11-07 | Fujitsu Ten Ltd | Disk revolving speed controller |
| JPS61206820A (en) * | 1985-03-11 | 1986-09-13 | Ntn Toyo Bearing Co Ltd | Magnetic bearing control device |
| JPS61286609A (en) * | 1985-06-11 | 1986-12-17 | Ntn Toyo Bearing Co Ltd | Control device of control type radial magnetic bearing |
-
1987
- 1987-07-07 JP JP62170677A patent/JPH0833162B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6415519A (en) | 1989-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |