JPH01137302A - Controller for magnetic bearing - Google Patents
Controller for magnetic bearingInfo
- Publication number
- JPH01137302A JPH01137302A JP29685887A JP29685887A JPH01137302A JP H01137302 A JPH01137302 A JP H01137302A JP 29685887 A JP29685887 A JP 29685887A JP 29685887 A JP29685887 A JP 29685887A JP H01137302 A JPH01137302 A JP H01137302A
- Authority
- JP
- Japan
- Prior art keywords
- displacement
- change
- circuit
- rotating body
- rotor
- 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.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 35
- 230000001681 protective effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Non-Positive Displacement Air Blowers (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Feedback Control In General (AREA)
- Control Of Position Or Direction (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 この発明は、磁気軸受の制御装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to a magnetic bearing control device.
従来の技術とその問題点
磁気軸受の制御装置として、回転体の位置を検出する位
置センサーの出力信号により電磁石用電力増幅器を介し
て電磁石を制御するPID制御回路を備えたものが知ら
れている。このような従来の制御装置は、通常、回転体
の変位に比例した制御量を供給するようになっているが
、より大きな軸受剛性を得ようとした場合、より大きな
制御量が必要となる。また、一方、より大きな制御量を
得ようとした場合、制御系のフィードバックゲインは大
きくなり、回転体の固有振動の影響により制御不能の状
態になってしまう。BACKGROUND TECHNOLOGIES AND THEIR PROBLEMS A known magnetic bearing control device includes a PID control circuit that controls an electromagnet via an electromagnet power amplifier using an output signal from a position sensor that detects the position of a rotating body. . Such conventional control devices normally supply a control amount proportional to the displacement of the rotating body, but when attempting to obtain greater bearing rigidity, a larger control amount is required. On the other hand, if an attempt is made to obtain a larger control amount, the feedback gain of the control system will increase, resulting in an uncontrollable state due to the influence of the natural vibration of the rotating body.
この発明の目的は、上記の問題を解決し、軸受剛性が高
くて安定性の良い磁気軸受の制御装置を提供することに
ある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a magnetic bearing control device that has high bearing rigidity and good stability.
問題点を解決するための手段
この発明による磁気軸受の制御装置は、回転体の位置を
検出する位置センサーの出力信号にもとづいてPID制
御回路により電磁石用電力増幅器を介して磁気軸受の電
磁石を制御する装置であって、
位置センサーとPrD制御回路の間に、回転体の変位が
小さいときには変位の変化に対する出力の変化が小さく
、回転体の変位が大きいときには変位の変化に対する出
力の変化が大きい可変ゲイン回路が設けられていること
を特徴とするものである。Means for Solving the Problems A magnetic bearing control device according to the present invention controls an electromagnet of a magnetic bearing via an electromagnet power amplifier using a PID control circuit based on an output signal of a position sensor that detects the position of a rotating body. between the position sensor and the PrD control circuit, a variable control circuit is provided between the position sensor and the PrD control circuit that causes a small change in output in response to a change in displacement when the displacement of the rotating body is small, and a large change in output in response to a change in displacement when the displacement of the rotating body is large. It is characterized by being provided with a gain circuit.
作 用
回転体の固有振動(高周波の振動)の振幅は小さく、低
周波の外乱による振動の振幅は大きい。The amplitude of the natural vibration (high-frequency vibration) of the working rotating body is small, and the amplitude of vibration caused by low-frequency disturbance is large.
回転体の変位が大きいときには、変位の変化に対する可
変ゲイン回路の出力の変化が大きいので、フィードバッ
クゲインが大きくなり、低周波の大振幅外乱に対する軸
受剛性が高くなる。When the displacement of the rotating body is large, the change in the output of the variable gain circuit with respect to the change in displacement is large, so the feedback gain becomes large, and the bearing rigidity against low-frequency, large-amplitude disturbances becomes high.
回転体の変位が小さいときには、変位の変化に対する可
変ゲイン回路の出力の変化が小さいので、フィードバッ
クゲインが小さく〆す、高周波の回転体の固有振動に対
する安定性が高くなる。When the displacement of the rotating body is small, the change in the output of the variable gain circuit with respect to the change in displacement is small, so the feedback gain is small and the stability against high frequency natural vibrations of the rotating body is high.
実 施 例 第1図は、この発明の1実施例を示す。Example FIG. 1 shows one embodiment of the invention.
この磁気軸受は、回転体(図示路)の位置を検出する位
置センサー(10)の出力信号にもとづいてPID制御
回路(11)により電磁石用電力増幅器(12)を介し
て磁気軸受の電磁石(13)を制御するものであり、位
置センサー(io)とPID制御回路(11)の間に、
回転体の変位が小さいときには変位の変化に対する出力
の変化が小さく、回転体の変位が大きいときには変位の
変化に対する出力の変化が大きい可変ゲイン回路(14
)が設けられている。位置センサー(10)、P I
D 制御回路(11)、電力増幅器(12)および電磁
石(13)は公知の任意の構成をとりうるものであるが
ら、詳細な説明は省略する。This magnetic bearing is connected to an electromagnet (13) of the magnetic bearing via an electromagnet power amplifier (12) by a PID control circuit (11) based on an output signal of a position sensor (10) that detects the position of a rotating body (path shown). ), between the position sensor (io) and the PID control circuit (11),
When the displacement of the rotating body is small, the change in output in response to a change in displacement is small, and when the displacement of the rotating body is large, the change in output in response to a change in displacement is large.
) is provided. Position sensor (10), P I
D Although the control circuit (11), the power amplifier (12), and the electromagnet (13) can have any known configuration, a detailed description thereof will be omitted.
第1図には、可変ゲイン回路(14)の1例の原理的な
構成が示されている。回転体の変位が小さいときすなわ
ち位置センサー(1o)の出力が一σと+σの間にある
とき(第2図の範囲A)は、可変ゲイン回路(14)の
出力は、第1の抵抗(15)により、回転体の変位の変
化に対する出力の変化が小さくなるように変化する。回
転体の変位が正で絶対値が大きいときすなわち位置セン
サー (10)の出力が+σより大きいとき(第2図の
範囲B)は、可変ゲイン回路(14)の出力は、第2の
抵抗(16)により、回転体の変位の変化に対する出力
の変化が大きくなるように変化する。FIG. 1 shows the basic configuration of an example of a variable gain circuit (14). When the displacement of the rotating body is small, that is, when the output of the position sensor (1o) is between 1σ and +σ (range A in FIG. 2), the output of the variable gain circuit (14) is 15), the output changes so that the change in output with respect to the change in displacement of the rotating body becomes smaller. When the displacement of the rotating body is positive and the absolute value is large, that is, when the output of the position sensor (10) is larger than +σ (range B in Fig. 2), the output of the variable gain circuit (14) is 16), the output changes in response to changes in the displacement of the rotating body.
回転体の変位が負で絶対値が大きいときすなわち位置セ
ンサー(10)の出力が−σより小さいとき(第2図の
範囲C)は、可変ゲイン回路(■4)の出力は、第3の
抵抗(17)により、回転体の変位の変化に対する出力
の変化が大きくなるように変化する。なお、第2図にお
いて、−Xおよび+Xは、回転体と保護軸受(図示路)
とのギャップを示している。When the displacement of the rotating body is negative and the absolute value is large, that is, when the output of the position sensor (10) is smaller than -σ (range C in Fig. 2), the output of the variable gain circuit (■4) is The resistance (17) changes the output so that the change in output with respect to the change in displacement of the rotating body increases. In addition, in Fig. 2, -X and +X indicate the rotating body and the protective bearing (path shown).
It shows the gap between
磁気軸受の回転体には、主として、固有振動(高周波の
振動)と低周波の外乱による振動が生じるが、固有振動
の振幅は小さく、低周波の外乱による振動の振幅は大き
い。In the rotating body of a magnetic bearing, vibrations mainly occur due to natural vibrations (high-frequency vibrations) and low-frequency disturbances, but the amplitude of the natural vibrations is small, and the amplitude of vibrations due to low-frequency disturbances is large.
回転体の変位が大きいときには、変位の変化に対する可
変ゲイン回路(14)の出力の変化が大きいので、フィ
ードバックゲインが大きくなり、低周波の大振幅外乱に
対する軸受剛性が高くなる。このため、回転体が大きく
変位して保護軸受に接触するようなことが、確実に防止
される。When the displacement of the rotating body is large, the change in the output of the variable gain circuit (14) with respect to the change in displacement is large, so the feedback gain becomes large and the bearing rigidity against low-frequency, large-amplitude disturbances becomes high. Therefore, it is reliably prevented that the rotating body is largely displaced and comes into contact with the protective bearing.
回転体の変位が小さいときには、変位の変化に対する可
変ゲイン回路(14)の出力の変化が小さいので、フィ
ードバックゲインが小さくなり、高周波の回転体の固有
振動に対する安定性が高くなる。When the displacement of the rotating body is small, the change in the output of the variable gain circuit (14) with respect to the change in displacement is small, so the feedback gain becomes small and the stability against high-frequency natural vibrations of the rotating body becomes high.
発明の効果
この発明の磁気軸受の制御装置によれば、位置センサー
とPID制御回路の間に、回転体の変位が小さいときに
は変位の変化に対する出力の変化が小さく、回転体の変
位が大きいときには変位の変化に対する出力の変化が大
きい可変ゲイン回路が設けられているので、上述のよう
に、低周波の大振幅外乱に対する軸受剛性が高く、高周
波の回転体の固有振動に対する安定性が良いという効果
を奏する。Effects of the Invention According to the magnetic bearing control device of the present invention, between the position sensor and the PID control circuit, when the displacement of the rotating body is small, the change in output in response to a change in displacement is small, and when the displacement of the rotating body is large, the change in output is small. Since a variable gain circuit is provided that has a large change in output in response to changes in play.
第1図はこの発明の実施例を示す磁気軸受の制御装置の
ブロック図、第2図は可変ゲイン回路の入力(変位)と
出力の関係を示すグラフである。
(10)・・・位置センサー、(11)・・・PID制
御回路、(12)・・・電磁石用電力増幅器、(13)
・・・電磁石、(14)・・・可変ゲイン回路。
以上
第2図FIG. 1 is a block diagram of a magnetic bearing control device showing an embodiment of the present invention, and FIG. 2 is a graph showing the relationship between input (displacement) and output of a variable gain circuit. (10)... Position sensor, (11)... PID control circuit, (12)... Power amplifier for electromagnet, (13)
...electromagnet, (14)...variable gain circuit. Figure 2 above
Claims (1)
とづいてPID制御回路により電磁石用電力増幅器を介
して磁気軸受の電磁石を制御する装置であって、 位置センサーとPID制御回路の間に、回転体の変位が
小さいときには変位の変化に対する出力の変化が小さく
、回転体の変位が大きいときには変位の変化に対する出
力の変化が大きい可変ゲイン回路が設けられていること
を特徴とする磁気軸受の制御装置。[Scope of Claims] A device for controlling an electromagnet of a magnetic bearing via an electromagnet power amplifier by a PID control circuit based on an output signal of a position sensor that detects the position of a rotating body, the device comprising: a position sensor and a PID control circuit In between, a variable gain circuit is provided which causes a small change in output in response to a change in displacement when the displacement of the rotating body is small, and a large change in output in response to a change in displacement when the displacement of the rotating body is large. Control device for magnetic bearings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62296858A JP2869725B2 (en) | 1987-11-25 | 1987-11-25 | Magnetic bearing control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62296858A JP2869725B2 (en) | 1987-11-25 | 1987-11-25 | Magnetic bearing control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01137302A true JPH01137302A (en) | 1989-05-30 |
JP2869725B2 JP2869725B2 (en) | 1999-03-10 |
Family
ID=17839073
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62296858A Expired - Fee Related JP2869725B2 (en) | 1987-11-25 | 1987-11-25 | Magnetic bearing control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2869725B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0242210A (en) * | 1988-07-29 | 1990-02-13 | Nippon Ferrofluidics Kk | Magnetic bearing device |
JPH03210607A (en) * | 1990-01-13 | 1991-09-13 | Fuji Electric Co Ltd | Analog servo controller |
US7057319B2 (en) | 2002-10-09 | 2006-06-06 | Ntn Corporation | Magnetic bearing device stably carrying a rotary shaft, program for executing a computer to control the magnetic bearing stably carrying the rotary shaft and computer-readable record medium storing the program |
JP2006145011A (en) * | 2004-11-24 | 2006-06-08 | Ishikawajima Harima Heavy Ind Co Ltd | Magnetic bearing device, rotary machine, and controlling method |
WO2021166816A1 (en) * | 2020-02-20 | 2021-08-26 | エドワーズ株式会社 | Vacuum pump controller and vacuum pump |
CN114593148A (en) * | 2022-03-11 | 2022-06-07 | 中国航空发动机研究院 | Control method and control device for electromagnetic bearing rotor system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS621175A (en) * | 1985-06-26 | 1987-01-07 | Nippon Gakki Seizo Kk | Servo-circuit |
-
1987
- 1987-11-25 JP JP62296858A patent/JP2869725B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS621175A (en) * | 1985-06-26 | 1987-01-07 | Nippon Gakki Seizo Kk | Servo-circuit |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0242210A (en) * | 1988-07-29 | 1990-02-13 | Nippon Ferrofluidics Kk | Magnetic bearing device |
JPH03210607A (en) * | 1990-01-13 | 1991-09-13 | Fuji Electric Co Ltd | Analog servo controller |
US7057319B2 (en) | 2002-10-09 | 2006-06-06 | Ntn Corporation | Magnetic bearing device stably carrying a rotary shaft, program for executing a computer to control the magnetic bearing stably carrying the rotary shaft and computer-readable record medium storing the program |
JP2006145011A (en) * | 2004-11-24 | 2006-06-08 | Ishikawajima Harima Heavy Ind Co Ltd | Magnetic bearing device, rotary machine, and controlling method |
WO2021166816A1 (en) * | 2020-02-20 | 2021-08-26 | エドワーズ株式会社 | Vacuum pump controller and vacuum pump |
CN114593148A (en) * | 2022-03-11 | 2022-06-07 | 中国航空发动机研究院 | Control method and control device for electromagnetic bearing rotor system |
Also Published As
Publication number | Publication date |
---|---|
JP2869725B2 (en) | 1999-03-10 |
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Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
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