Patent US3314594A successfully refreshed from Google Patents.
US3571640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flux reversing sensor
Assignee: ZF Active Safety US Inc
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Filing: 1969-04-25
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Granted: 1971-03-23
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Expires: 1989-04-25
Abstract
Abstract A flux reversing sensor using a single annular permanent magnet having a north and south pole and a pair of members, one of the members having a portion engaged with the north pole of the magnet and the other having a portion engaged with the south pole of the magnet, the members having fingers alternatively arranged such that the fingers of the one member has a north polarity and the fingers of the other member have a south polarity so as to establish an alternating flux field circumferentially along the magnet, the magnet is adapted to rotate relative to a stator with a coil so as to induce an alternating potential in the coil representative of the rotational speed of the magnet.
Inventors
- 👤 John A Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A rotational speed sensing device comprising: a rotor and a stator, said rotor being rotatably mounted with respect to said stator and including an assembly of a magnet having a north and south pole, a first member having a first plurality of fingers magnetically connected to one pole, a second member having a second plurality of fingers magnetically connected to the other pole, the fingers of said first plurality being located alternately relative to the fingers of said second plurality, said stator including a coil such that rotation of said rotor relative to said stator generates an alternating potential in said coil.
Claim 2
Dependent Claim
102 words
A rotational speed sensing device comprising: a rotor and a stator, said rotor being rotatably mounted with respect to said stator and including an assembly of a magnet having a north and south pole, a first member having a first plurality of fingers magnetically connected to one pole, a second member having a second plurality of fingers magnetically connected to the other pole, the fingers of said first plurality being located alternately relative to the fingers of said second plurality, said stator including a coil such that rotation of said rotor relative to said stator generates an alternating potential in said coil.
Claim 3
Dependent Claim
16 words
The device of claim 1 with said magnet, and said first and second members extending circumferentially.
Claim 4
Dependent Claim
16 words
The device of claim 1 with said magnet and said first and second members extending annularly.
Claim 5
Dependent Claim
67 words
The device of claim 1 with said stator including shell means having a plurality of fingers with alternate ones defining opposite magnetic paths around said coil, said fingers of said shell means and said fingers of said first and second members being radially aligned whereby relative rotation between said rotor and stator results in flux reversals about said coil and an alternating potential induced in said coil.
Claim 6
Dependent Claim
167 words
A rotational speed sensing device comprising: a rotor and a stator, said rotor being rotatably mounted with respect to said stator and including an assembly of an annular magnet having oppositely, axially facing north and south poles, a first L-shaped member having a first radially extending side portion engaging one pole and a first plurality of circumferentially distributed axially extending fingers, a second L-shaped member having a second radially extending side portion engaging the other pole and a second plurality of circumferentially distributed axially extending fingers, the fingers of said first plurality being located alternately relative to the fingers of said second plurality, said stator including a coil and shell means having a plurality of fingers with alternate ones defining opposite magnetic paths around said coil, said fingers of said shell means and said fingers of said first and second members being radially aligned whereby relative rotation between said rotor and stator results in flux reversals about said coil and an alternating potential induced in said coil.
Claim 7
Dependent Claim
167 words
A rotational speed sensing device comprising: a rotor and a stator, said rotor being rotatably mounted with respect to said stator and including an assembly of an annular magnet having oppositely, axially facing north and south poles, a first L-shaped member having a first radially extending side portion engaging one pole and a first plurality of circumferentially distributed axially extending fingers, a second L-shaped member having a second radially extending side portion engaging the other pole and a second plurality of circumferentially distributed axially extending fingers, the fingers of said first plurality being located alternately relative to the fingers of said second plurality, said stator including a coil and shell means having a plurality of fingers with alternate ones defining opposite magnetic paths around said coil, said fingers of said shell means and said fingers of said first and second members being radially aligned whereby relative rotation between said rotor and stator results in flux reversals about said coil and an alternating potential induced in said coil.
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |