Patent US5202824A successfully refreshed from Google Patents.
US5202824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating force generator for magnetic bearings
Assignee: Soluna Holdings Inc
•
Filing: 1992-08-06
•
Granted: 1993-04-13
•
Expires: 2012-08-06
Abstract
Abstract The present invention relates to apparatus for stabilizing the operation of rotational machinery, particularly machinery which uses magnetic bearings. Accelerometers sense various vibrations within the machinery. The outputs of the accelerometers are analyzed by a Fast Fourier Transform algorithm and multiplied by an array of influence coefficients to calculate desired stabilizing forces to be applied to the rotating machinery. Compensating analog voltage signals are generated in accordance therewith and transmitted to magnetic control coils within the rotating machinery.
Inventors
- 👤 Hsiang M. Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:22
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0444; F16C32/0474; F16C32/0493; F16C2380/00; F16C2380/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
175 words
An apparatus for stabilizing rotational machinery, comprising: sensing means coupled to the rotational machinery for detecting vibrations of the rotational machinery; a feedforward processing means response to said sensing means for calculating amplitude and phase information of at least one frequency component of said vibrations, said processing means including determining means for periodically determining if said amplitude information exceeds a predetermined threshold, said processing means further including updating means, responsive to said determining means, for updating an array of output of said information only when said predetermined threshold is exceeded; a calculating means to calculate signals from said amplitude and phase information to compensate for said vibrations; said calculating means including means for outputting experimental signals and calculating an array of coefficients from a response to said experimental signals and means for multiplying said array of coefficients by said array of output from said processing means; generating means to generate said signals in said analog form; and magnetic coils within the rotational machinery controlled to stabilize said rotational machinery by said signals in analog form.
Claim 2
Independent Claim
175 words
An apparatus for stabilizing rotational machinery, comprising: sensing means coupled to the rotational machinery for detecting vibrations of the rotational machinery; a feedforward processing means response to said sensing means for calculating amplitude and phase information of at least one frequency component of said vibrations, said processing means including determining means for periodically determining if said amplitude information exceeds a predetermined threshold, said processing means further including updating means, responsive to said determining means, for updating an array of output of said information only when said predetermined threshold is exceeded; a calculating means to calculate signals from said amplitude and phase information to compensate for said vibrations; said calculating means including means for outputting experimental signals and calculating an array of coefficients from a response to said experimental signals and means for multiplying said array of coefficients by said array of output from said processing means; generating means to generate said signals in said analog form; and magnetic coils within the rotational machinery controlled to stabilize said rotational machinery by said signals in analog form.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 wherein said processing means includes Fast Fourier Transform means.
Claim 4
Dependent Claim
31 words
The apparatus of claim 2 further including a phase and frequency sensor within said rotating machinery and wherein said Fast Fourier Transform means is responsive to said phase and frequency sensor.
Claim 5
Dependent Claim
23 words
The apparatus of claim 2 further including means for subtracting substantially instantaneous displacements of the rotational machinery from said signals in analog form.
Claim 6
Dependent Claim
16 words
The apparatus of claim 4 further including means for amplifying output of said means for subtracting.
Claim 7
Dependent Claim
25 words
The apparatus of claim 5 further including means for inverting and amplifying output of said means for subtracting in parallel with said means for amplifying.
Claim 8
Dependent Claim
33 words
The apparatus of claim 6 wherein output from said means for amplifying and output from said means for inverting and amplifying are transmitted to diametrically opposed magnetic control coils within said rotating machinery.
Claim 9
Independent Claim
180 words
An apparatus for stabilizing rotational machinery bearings, comprising: sensing means coupled to the rotational magnetic bearings for detecting vibrations of the rotational magnetic bearings; a feedforward processing means responsive to said sensing means for calculating amplitude and phase information of at least one frequency component of said vibrations, said processing means including determining means for periodically determining if said amplitude information exceeds a predetermined threshold, said processing means further including updating means, responsive to said determining means, for updating an array of output of said information only when said predetermined threshold is exceeded; a calculating means to calculate signals from said amplitude and phase information to compensate for said vibrations; said calculating means including means for outputting experimental signals and calculating an array of coefficients from a response to said experimental signals and means for multiplying said array of coefficients by said array of output from said processing means; generating means to generate said signals in said analog form; and magnetic coils within the rotational magnetic bearings controlled to stabilize said rotational magnetic bearings by said signals in analog form.
Claim 10
Independent Claim
180 words
An apparatus for stabilizing rotational machinery bearings, comprising: sensing means coupled to the rotational magnetic bearings for detecting vibrations of the rotational magnetic bearings; a feedforward processing means responsive to said sensing means for calculating amplitude and phase information of at least one frequency component of said vibrations, said processing means including determining means for periodically determining if said amplitude information exceeds a predetermined threshold, said processing means further including updating means, responsive to said determining means, for updating an array of output of said information only when said predetermined threshold is exceeded; a calculating means to calculate signals from said amplitude and phase information to compensate for said vibrations; said calculating means including means for outputting experimental signals and calculating an array of coefficients from a response to said experimental signals and means for multiplying said array of coefficients by said array of output from said processing means; generating means to generate said signals in said analog form; and magnetic coils within the rotational magnetic bearings controlled to stabilize said rotational magnetic bearings by said signals in analog form.
Claim 11
Dependent Claim
14 words
The apparatus of claim 8 wherein said processing means includes Fast Fourier Transform means.
Claim 12
Dependent Claim
32 words
The apparatus of claim 9 further including a phase and frequency sensor within said rotational magnetic bearings and wherein said Fast Fourier Transform means is responsive to said phase and frequency sensor.
Claim 13
Dependent Claim
28 words
The apparatus of claim 9 further including means for subtracting substantially instantaneous displacements of a rotor rotating within the rotational magnetic bearings from said signals in analog form.
Claim 14
Dependent Claim
16 words
The apparatus of claim 11 further including means for amplifying output of said means for subtracting.
Claim 15
Dependent Claim
25 words
The apparatus of claim 12 further including means for inverting and amplifying output of said means for subtracting in parallel with said means for amplifying.
Claim 16
Dependent Claim
35 words
The apparatus of claim 13 wherein output from said means for amplifying and output from said means for inverting and amplifying are transmitted to diametrically opposed magnetic control coils adjacent to said rotating magnetic bearings.
References Cited (Backward Citations)
US4697128A
Cited
US4910449A
Cited
US4929874A
Cited
US5012428A
Cited
US4989158A
Cited
US4912387A
Cited
US4992714A
Cited
US4963804A
Cited
US5013987A
Cited
US4999534A
Cited
US5010769A
Cited
US5084643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |