US3670231A
Expired / Lapsed
US
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Apparatus for monitoring flow of current in a conductor
Assignee: English Electric Co Ltd
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Filing: 1971-02-08
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Granted: 1972-06-13
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Expires: 1991-02-08
Abstract
Abstract Apparatus for monitoring the flow of recurring pulses of direct current in a conductor. The apparatus includes magnetic means coupled to the conductor for establishing a magnetic field in a known discrete path in response to the recurring pulses and sensing means for generating a signal when a magnetic field is established. The apparatus can be included in a rotatable rectifier system having a plurality of rectifier arms, a magnetic means being coupled to a conductor in each rectifier arm. The magnetic means are disposed in a circular arrangement so that they may generate a signal in a common stationary sensing means as they rotate and pass the sensing means.
Inventors
- 👤 George Albert Farquhar Maddick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:20
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/145; G01R19/15; H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/046
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
Apparatus for monitoring the flow of recurring pulses of direct current in a rotatable rectifier system which has a plurality of rectifier arms interconnected by electrical conductors including, for each rectifier arm, a magnetic means coupled to a conductor in the associated rectifier arm for establishing a magnetic field in a known discrete path in response to the recurring pulses of direct current, the magnetic means being disposed in a circular arrangement, the apparatus including a common stationary sensing means which generates a signal in response to each discrete magnetic field established by the magnetic means.
Claim 2
Dependent Claim
96 words
Apparatus for monitoring the flow of recurring pulses of direct current in a rotatable rectifier system which has a plurality of rectifier arms interconnected by electrical conductors including, for each rectifier arm, a magnetic means coupled to a conductor in the associated rectifier arm for establishing a magnetic field in a known discrete path in response to the recurring pulses of direct current, the magnetic means being disposed in a circular arrangement, the apparatus including a common stationary sensing means which generates a signal in response to each discrete magnetic field established by the magnetic means.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 including means for generating a reference marker signal whereby each individual magnetic means and its associated conductor can be identified.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 1 including means for generating reference marker signals indicative of each individual magnetic means.
Claim 5
Dependent Claim
44 words
Apparatus according to claim 3 in which a high frequency signal is supplied to the stationary sensing means whereby the value of the current of the high frequency signal is changed as each magnetic means rotates past the sensing means and changes its inductance.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 1 in which the magnetic means comprises a winding of low retentivity magnetic material disposed about the conductor, the magnetic field being established across the ends of the winding.
Claim 7
Dependent Claim
63 words
Apparatus according to claim 1 in which the winding comprises a single turn of the magnetic material, the ends of the signal turn being displaced along the length of the conductor in overlapping relationship, and including an extension oF the magnetic material attached to each end of the winding and projecting away from the conductor to form magnetic poles spaced from the conductor.
Claim 8
Dependent Claim
31 words
Apparatus according to claim 6 in which each magnetic pole is surrounded by a short circuited winding which helps to maintain the magnetic field between consecutive ones of the recurring pulses.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |