US4199718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing wear detector for AC rotary electric instrument
Assignee: Nikkiso Co Ltd
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Filing: 1977-04-27
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Granted: 1980-04-22
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Expires: 1997-04-27
Abstract
Abstract A bearing wear detector for an AC rotary electric instrument such as an electric motor or a generator in which more than three detecting coils are mounted around a core of the electric instrument having poles of three or not three multiples at a relative space angle and the detecting coils are connected in series to obtain a resultant voltage.
Inventors
- 👤 Hiroshi Ikeda
- 👤 Osamu Ishimaru
- 👤 Teruyoshi Nakatake
- 👤 Tetsuzo Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:10
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/14; G01B7/144; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/22; G01D5/2208; G01D5/2216
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A bearing wear detector for an AC rotary instrument having a rotor and a stator, in which stator are defined a plurality of magnetic pole positions, comprising a plurality of detecting coils mounted on said stator approximately uniformly spaced from each other and concentric to the central axis of the stator, the number of said pole positions being other than a multiple of the detecting coils, said detecting coils being connected in series with each and to means for measuring variation in voltage passing therethrough.
Claim 2
Dependent Claim
85 words
A bearing wear detector for an AC rotary instrument having a rotor and a stator, in which stator are defined a plurality of magnetic pole positions, comprising a plurality of detecting coils mounted on said stator approximately uniformly spaced from each other and concentric to the central axis of the stator, the number of said pole positions being other than a multiple of the detecting coils, said detecting coils being connected in series with each and to means for measuring variation in voltage passing therethrough.
Claim 3
Dependent Claim
34 words
The detector according to claim 1 wherein the number of poles is not a multiple of three and the number of coils are three, spaced about said stator at approximately 120° from each other.
Claim 4
Dependent Claim
34 words
The detector according to claim 2, wherein the number of poles is not a multiple of three and the number of coils is six spaced about said stator at approximately 60° from each other.
Claim 5
Dependent Claim
13 words
The detector according to claim 1, wherein the instrument is an electric motor.
Claim 6
Dependent Claim
13 words
The detector according to claim 1, wherein the instrument is an electric generator.
Claim 7
Dependent Claim
33 words
The detector according to claim 1, wherein the number of poles is not a multiple of four and the number of coils are four spaced about said stator approximately 90° from each other.
Claim 8
Dependent Claim
33 words
The detector according to claim 1, wherein the number of poles is not a multiple of four and the number of coils are eight spaced about said stator approximately 45° from each other.
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) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |