US4261206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault diagnostic device for winding of electric machinery and apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1979-08-01
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Granted: 1981-04-14
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Expires: 1999-08-01
Abstract
Abstract A fault diagnostic device comprises vibrating means for vibrating a winding by feeding current having a predetermined frequency; detecting means for detecting physical value given in said winding by the vibration; and indicating means for indicating the result of the detection by said detecting means whereby a diagnosis of fault can be performed in high reliability.
Inventors
- 👤 Akemi Futakawa
- 👤 Tokio Fukunaga
- 👤 Tsutomu Tani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:25
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/346
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
102 words
A fault diagnostic device for a winding of an electric instrument which comprises vibrating means for forcibly vibrating said winding of the electric instrument by feeding current having a predetermined frequency thereto; detecting means for directly detecting vibration acceleration of said winding by the forced vibration caused by said vibrating means and for outputting an electrical signal indicative of the detected vibration; said vibrating means comprising phase angle controlling means which adjusts a phase angle at the time of initiating the feeding of the current to said winding; and indicating means for indicating the result of the detection by said detecting means.
Claim 2
Dependent Claim
102 words
A fault diagnostic device for a winding of an electric instrument which comprises vibrating means for forcibly vibrating said winding of the electric instrument by feeding current having a predetermined frequency thereto; detecting means for directly detecting vibration acceleration of said winding by the forced vibration caused by said vibrating means and for outputting an electrical signal indicative of the detected vibration; said vibrating means comprising phase angle controlling means which adjusts a phase angle at the time of initiating the feeding of the current to said winding; and indicating means for indicating the result of the detection by said detecting means.
Claim 3
Dependent Claim
25 words
The fault diagnostic device according to claim 1 wherein said indicating means indicates the result of the detection by said detecting means as a waveform.
Claim 4
Dependent Claim
46 words
The fault diagnostic device according to claim 2 wherein said detecting means is a piezoelectric detector for converting the mechanical force caused by the force vibration of said winding into an electric signal depending upon the value of the mechanical force and outputting the electric signal.
Claim 5
Dependent Claim
19 words
The fault diagnostic device according to claim 2 wherein said vibrating means feeds an AC current to said winding.
Claim 6
Dependent Claim
16 words
The fault diagnostic device according to claim 2 wherein said electric instrument is a rotary machine.
Claim 7
Dependent Claim
90 words
The fault diagnostic device according to claim 1 wherein said phase angle controlling means comprises a turn-on pulse generator for controlling a phase angle at the time initiating the feeding of the current to said winding by generating turn-on pulse at each cycle of the output of said vibrating means and a counter for counting number of the turn-on pulses and stopping the feeding of the current to said winding by transmitting an operation stopping signal to said turn-on pulse generator when the counter value reaches to a predetermined value.
Claim 8
Dependent Claim
23 words
The fault diagnostic device according to claim 1 wherein said detecting means is a displacement detector for detecting a displacement of said winding.
Claim 9
Dependent Claim
31 words
The fault diagnostic device according to claim 7 which further comprises amplitude controlling means for controlling an amplitude of output voltage of the feeding current which originates from a power source.
Claim 10
Dependent Claim
58 words
The fault diagnostic device according to claim 8 wherein said phase angle controlling means controls the phase angle at the time of generating the output voltage by generating turn-on pulses at each cycle and comprises a counter for counting turn-on pulses which allows the feeding of the power to be stopped after counting a predetermined number of pulses.
Claim 11
Dependent Claim
17 words
The fault diagnostic device according to claim 8 wherein said power source is an AC power source.
Claim 12
Dependent Claim
19 words
The fault diagnostic device according to claim 7 or 8 wherein said electric instrument is a rotary electric machine.
Claim 13
Dependent Claim
26 words
The fault diagnostic device according to claim 7 or 8 wherein said indicating means indicates the result of detection by said detecting means as a waveform.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |