US4841212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic bearing control apparatus
Assignee: Hitachi Ltd
•
Filing: 1987-05-28
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Granted: 1989-06-20
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Expires: 2007-05-28
Abstract
Abstract In an electromagnetic bearing control apparatus for suppressing vibratory rotational motion of a rotor, a selective extraction unit is provided in servo-circuits which control currents being supplied to electromagnetic coils in accordance with x and y-component signals of radial displacement of the rotor such that the rotor is held in a predetermined radial position, and x and y-component signals delivered out of the selective extraction unit are crossed and inputted to the servo-circuits so as to be added in opposite polarities to processed x and y-component signals of radial displacement.
Inventors
- 👤 Osami Matsushita
- 👤 Michiyuki Takagi
- 👤 Mitsuho Yoneyama
- 👤 Toyomi Sugaya
- 👤 Ikuhiro Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:55
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0444; F16C32/0451; F16C32/0453
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
223 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, for adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and for subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits; wherein said selective extraction means comprises a band-pass filter which coincide with a frequency of a self-excited vibration generated as said rotor rotates.
Claim 2
Dependent Claim
223 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, for adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and for subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits; wherein said selective extraction means comprises a band-pass filter which coincide with a frequency of a self-excited vibration generated as said rotor rotates.
Claim 3
Dependent Claim
243 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, for adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and for subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits; wherein said selective extraction means comprises a tracking filter which detects a frequency of self-excited vibration generated as said rotor rotates and which is responsive to the detection frequency to extract a self-excited vibration frequency component from said displacement x and y-component signals.
Claim 4
Dependent Claim
243 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, for adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and for subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits; wherein said selective extraction means comprises a tracking filter which detects a frequency of self-excited vibration generated as said rotor rotates and which is responsive to the detection frequency to extract a self-excited vibration frequency component from said displacement x and y-component signals.
Claim 5
Dependent Claim
330 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; first and second selective extraction means for extracting frequency components to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said first and second selective means for adding one component of x and y-component signals of one frequency component delivered out of said first selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits for subtracting the other component of x and y-component signals of said one frequency component delivered out of said first selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits for subtracting said one component of x and y-component signals of the other frequency component delivered out of said second selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of said the other of said x and y-component control circuits, and for adding said the other component of x and y-component signals of the other frequency component delivered out of said second selective extraction means to said one component of said processed displacement x and y-component signals delivered out of said one of said x and y-component control circuits; wherein each of said first and second selective extraction means comprises a band-pass filter for a frequency of a self-excited vibration generated as said rotor rotates.
Claim 6
Dependent Claim
330 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; first and second selective extraction means for extracting frequency components to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said first and second selective means for adding one component of x and y-component signals of one frequency component delivered out of said first selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits for subtracting the other component of x and y-component signals of said one frequency component delivered out of said first selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits for subtracting said one component of x and y-component signals of the other frequency component delivered out of said second selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of said the other of said x and y-component control circuits, and for adding said the other component of x and y-component signals of the other frequency component delivered out of said second selective extraction means to said one component of said processed displacement x and y-component signals delivered out of said one of said x and y-component control circuits; wherein each of said first and second selective extraction means comprises a band-pass filter for a frequency of a self-excited vibration generated as said rotor rotates.
Claim 7
Dependent Claim
357 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; first and second selective extraction means for extracting frequency components to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said first and second selective means for adding one component of x and y-component signals of one frequency component delivered out of said first selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits for subtracting the other component of x and y-component signals of said one frequency component delivered out of said first selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits for subtracting said one component of x and y-component signals of the other frequency component delivered out of said second selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of said the other of said x and y-component control circuits, and for adding said the other component of x and y-component signals of the other frequency component delivered out of said second selective extraction means to said one component of said processed displacement x and y-component signals delivered out of said one of said x and y-component control circuits; wherein each of said first and second selective extraction means comprises a tracking filter which detects a frequency of a self-excited vibration generated as said rotor rotates and which is responsive to the detected frequency to the detected frequency to extract a self-excited vibration frequency component from said displacement x and y-component signals.
Claim 8
Dependent Claim
357 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said rotor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; first and second selective extraction means for extracting frequency components to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said first and second selective means for adding one component of x and y-component signals of one frequency component delivered out of said first selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits for subtracting the other component of x and y-component signals of said one frequency component delivered out of said first selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits for subtracting said one component of x and y-component signals of the other frequency component delivered out of said second selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of said the other of said x and y-component control circuits, and for adding said the other component of x and y-component signals of the other frequency component delivered out of said second selective extraction means to said one component of said processed displacement x and y-component signals delivered out of said one of said x and y-component control circuits; wherein each of said first and second selective extraction means comprises a tracking filter which detects a frequency of a self-excited vibration generated as said rotor rotates and which is responsive to the detected frequency to the detected frequency to extract a self-excited vibration frequency component from said displacement x and y-component signals.
Claim 9
Dependent Claim
335 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said motor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits when the direction of orbital motion of said rotor coincides with the direction of rotation of said rotor about its own axis, and subtracting said one component of x and y-component signals of said frequency component delivered out of said selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and adding said the other component of x and y-component signals of said frequency component delivered out of said selective extraction means to said one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits when the direction of orbital motion of said rotor does not coincide with the direction of rotation of said rotor about its own axis.
Claim 10
Dependent Claim
335 words
An electromagnetic bearing control apparatus having means for detecting orthogonal x and y-component signals of radial displacement of a rotor, and servo-circuit means for controlling currents being supplied to electromagnetic coils in accordance with the displacement x and y-component signals from said detecting means such that said motor is held in a predetermined radial position, said servo-circuit means comprising: an x-component control circuit for processing said displacement x-component signal; a y-component control circuit for processing said displacement y-component signal; selective extraction means for extracting a frequency component to be controlled from said displacement x and y-component signals; and means for supplying said displacement x and y-component signals to said selective extraction means, adding one component of x and y-component signals of said frequency component delivered out of said selective extraction means to the other component of the processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and subtracting the other component of x and y-component signals of said frequency component delivered out of said selective extraction means from one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits when the direction of orbital motion of said rotor coincides with the direction of rotation of said rotor about its own axis, and subtracting said one component of x and y-component signals of said frequency component delivered out of said selective extraction means from said the other component of said processed displacement x and y-component signals delivered out of the other of said x and y-component control circuits, and adding said the other component of x and y-component signals of said frequency component delivered out of said selective extraction means to said one component of said processed displacement x and y-component signals delivered out of one of said x and y-component control circuits when the direction of orbital motion of said rotor does not coincide with the direction of rotation of said rotor about its own axis.
Claim 11
Dependent Claim
48 words
An electromagnetic bearing control apparatus according to claim 5 further comprising an oscillator for generating a signal of the same frequency as a natural vibration frequency of a self-excited vibration of said rotor and means for supplying the frequency signal from said oscillator to said selective extraction means.
Claim 12
Dependent Claim
17 words
An electromagnetic bearing control apparatus according to claim 6 wherein said oscillator comprises a rotation pulse generator.
References Cited (Backward Citations)
US1589039A
Cited
US2602660A
Cited
US3243238A
Cited
US3508445A
Cited
US3638093A
Cited
US3988658A
Cited
US4121143A
Cited
US4583031A
Cited
US4626754A
Cited
US4686404A
Cited
US4697128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |