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US5800331A
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Imbalance detection and rotor identification system
Assignee: Individual
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Filing: 1997-10-01
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Granted: 1998-09-01
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Expires: 2017-10-01
Abstract
Abstract Apparatus and a method for detecting imbalance and for identifying rotors in centrifuges is disclosed. An accelerometer measures the vibration of a rotating drive system as it accelerates from rest to a predetermined speed, and a signal processing system monitors changes in the magnitude of measured vibration energy. The processing system determines the power spectrum density of the measured values and from this the frequency spectrum and the total energy spectrum of the measured vibration are determined. These values may be used to provide an identifying profile which can be used as a reference for later identification of drive systems and rotors in operating systems, and for monitoring and controlling such operating systems.
Inventors
- 👤 Jin Y. Song
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:32
CPC Classifications
B; B04; B04B; B04B13/00; B04B13/003; B04B9/00; B04B9/14; B04B9/146; G; G01; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
An identification system, comprising: a) a rotary drive system including a rotor and a drive motor operatively connected to rotatably drive said rotor; b) a vibration sensor located to detect vibration in said drive system during operation of said motor to accelerate said rotor from a rest condition to a selected final speed of rotation and to produce a corresponding drive system vibration data signal; c) a speed sensor for producing a speed data signal corresponding to the rate of rotation of said rotor; d) a processor responsive to said vibration data signal to produce a corresponding power spectrum density signal; e) means for deriving from said power spectrum density signal the frequency spectrum of said drive system data signal; and f) a comparator for comparing said derived frequency spectrum with the frequency spectra of known drive systems to identify said first-named drive system.
Claim 2
Dependent Claim
144 words
An identification system, comprising: a) a rotary drive system including a rotor and a drive motor operatively connected to rotatably drive said rotor; b) a vibration sensor located to detect vibration in said drive system during operation of said motor to accelerate said rotor from a rest condition to a selected final speed of rotation and to produce a corresponding drive system vibration data signal; c) a speed sensor for producing a speed data signal corresponding to the rate of rotation of said rotor; d) a processor responsive to said vibration data signal to produce a corresponding power spectrum density signal; e) means for deriving from said power spectrum density signal the frequency spectrum of said drive system data signal; and f) a comparator for comparing said derived frequency spectrum with the frequency spectra of known drive systems to identify said first-named drive system.
Claim 3
Dependent Claim
51 words
The system of claim 1, further including: a) means for deriving from said power spectrum density signal the total energy spectrum of said drive system data signal; and b) a second comparator for comparing said total energy spectrum to a vibration threshold value to detect excessive vibration in said drive system.
Claim 4
Dependent Claim
24 words
The system of claim 2, wherein said speed sensor is connected to produce said speed data signal in synchronism with said vibration data signal.
Claim 5
Dependent Claim
19 words
The system of claim 3, wherein said drive system vibration data signal is digitized for input to said processor.
Claim 6
Dependent Claim
24 words
The system of claim 3, wherein said drive system vibration data signal corresponds to the magnitude and pattern of vibration of said drive system.
Claim 7
Dependent Claim
28 words
The system of claim 3, wherein said total energy spectrum corresponds to the sum of the vibrational energy measured by said vibration sensor during acceleration of said rotor.
Claim 8
Dependent Claim
37 words
The system of claim 3, wherein said means for deriving said frequency spectrum includes means for evaluating said power spectrum density signal to determine the frequency of rotation of said rotor at the maximum amplitude of vibration.
Claim 9
Dependent Claim
21 words
The system of claim 7, further including means responsive to said second comparator to control the operation of said drive motor.
Claim 10
Independent Claim
138 words
A method for identifying and for detecting imbalance in drive systems embodying rotating bodies, comprising: a) accelerating a drive system from rest to a predetermined rotational speed; b) synchronously measuring, during said acceleration, the rate of rotation and the vibrational motion of the drive system to produce a speed signal and a vibration data signal; c) producing, from said vibration data signal, a power spectrum density signal; d) deriving from said power spectrum density signal the frequency spectrum of said drive system data signal; e) comparing said frequency spectrum with frequency spectra of known drive systems to identify said drive system; f) deriving from said power spectrum density signal the total energy spectrum of said drive system data signal; and g) comparing said total energy spectrum to a vibration threshold to detect excessive vibration in said drive system.
Claim 11
Independent Claim
138 words
A method for identifying and for detecting imbalance in drive systems embodying rotating bodies, comprising: a) accelerating a drive system from rest to a predetermined rotational speed; b) synchronously measuring, during said acceleration, the rate of rotation and the vibrational motion of the drive system to produce a speed signal and a vibration data signal; c) producing, from said vibration data signal, a power spectrum density signal; d) deriving from said power spectrum density signal the frequency spectrum of said drive system data signal; e) comparing said frequency spectrum with frequency spectra of known drive systems to identify said drive system; f) deriving from said power spectrum density signal the total energy spectrum of said drive system data signal; and g) comparing said total energy spectrum to a vibration threshold to detect excessive vibration in said drive system.
References Cited (Backward Citations)
US2895023A
Cited
US3101322A
Cited
US4060716A
Cited
US4096988A
Cited
US4214179A
Cited
US4491019A
Cited
US4601696A
Cited
US4551715A
Cited
US4700117A
Cited
US5037371A
Cited
US4827197A
Cited
US4857811A
Cited
US5160876A
Cited
US5235864A
Cited
US5383838A
Cited
US5496254A
Cited
US5509881A
Cited
US5646340A
Cited
US5649893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-31 | 2002-03-02 | 2002-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-31 | 2006-03-02 | 2006-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-31 | 2010-03-02 | 2010-09-01 | $7700.00 | Window Closed / Lapsed |