US4502329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for checking insulative condition of insulated windings used in electrical appliances
Assignee: Mitsubishi Electric Corp
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Filing: 1983-03-21
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Granted: 1985-03-05
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Expires: 2003-03-21
Abstract
Abstract The disclosure describes a method for checking an insulative condition of an insulated winding used in an electrical appliance comprising applying an external mechanical force to said insulated winding to give vibrating frequency to the same for its examination; detecting the frequency behavior to be generated in said insulated winding in the form of electrical signal outputs; and electrically processing the signals for judging deterioration occurred in said insulated winding.
Inventors
- 👤 Tokio Fukunaga
- 👤 Akemi Futakawa
- 👤 Mataichiro Kiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:49
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01N; G01N29/00; G01N29/04; G01N29/045; G01N29/12; G01N3/00; G01N3/32; G01R31/346; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A method for testing the condition of the insulation in an insulated winding, comprising the steps of: applying an external mechanical force to said insulated winding so as to impart a vibration having a frequency in said insulated winding; measuring said frequency in said insulated winding; measuring the amplitude of said vibration in said insulated winding with an accelerometer to produce an output; detecting a change in said frequency with respect to a change in said accelerometer output; determining the condition of said insulation based on said change in frequency.
Claim 2
Independent Claim
90 words
A method for testing the condition of the insulation in an insulated winding, comprising the steps of: applying an external mechanical force to said insulated winding so as to impart a vibration having a frequency in said insulated winding; measuring said frequency in said insulated winding; measuring the amplitude of said vibration in said insulated winding with an accelerometer to produce an output; detecting a change in said frequency with respect to a change in said accelerometer output; determining the condition of said insulation based on said change in frequency.
Claim 3
Dependent Claim
95 words
The method for testing according to claim 1 wherein: said external mechanical force is the output of a vibration applying device driven by an excitation signal from a functional generator; said accelerometer output is received and amplified by a signal conditioner to produce an amplified signal; said excitation signal and said amplified signal being received by a recording and displaying device; and further comprising the step of: varying said excitation signal so as to obtain a series of values of said frequency as a function of said amplified signal from said recording and displaying device.
Claim 4
Dependent Claim
98 words
The method for testing according to claim 1 wherein: said external mechanical force is a hammer strike; said accelerometer output is received and amplified by a signal conditioner to produce an amplified signal; said amplified signal is analyzed by a frequency analyzer to detect said frequency; said frequency and said amplified signal being received by a recording and displaying device; and further comprising the step of: varying the force of said hammer strike so as to obtain a series of said values of said frequency as a function of said amplified signal from said recording and displaying device.
Claim 5
Dependent Claim
87 words
The method for testing according to claim 1, wherein: said accelerometer output is received and amplified by a signal conditioner to produce an amplified signal; said amplified signal is measured by a frequency measuring device to detect said frequency; said frequency and said amplified signal being received by a recording device; and further comprising the steps of: storing in an operational device data from said recording device concerning said frequencies and said amplified signals; displaying the results of said determination of said insulation in a displaying device.
Claim 6
Dependent Claim
33 words
The method for testing according to claim 2 further comprising the steps of: storing in an operational device data from said recording and displaying device concerning said excitation signal and said amplified signal.
Claim 7
Dependent Claim
32 words
The method for testing according to claim 3 further comprising the step of: storing in an operation device data from said recording and displaying device concerning said value and said amplified signal.
References Cited (Backward Citations)
US3345861A
Cited
US3580056A
Cited
US3771356A
Cited
US4128011A
Cited
US4261206A
Cited
US4281547A
Cited
US4342229A
Cited
US4400980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |