US4646011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic angular position transmitter with toroidal core and rotatable magnet
Assignee: Mannesmann VDO AG
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Filing: 1984-11-28
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Granted: 1987-02-24
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Expires: 2004-11-28
Abstract
Abstract In a contact-less electronic angular-position transmitter having a turnable magnet (5), sensor coils (11, 12) arranged at right angles to each other are provided on a toroidal core (9), common to all sensor coils, of a magnetic-field detector formed in accordance with the flux-gate principle in order to determine the angular position. The angular-position transmitter is preferably arranged, together with the turnable magnets and the turnable core having the sensor coils, in a housing (1) which shields them from the terrestrial field. In the said housing, the inner space (2), within which the magnet can turn, is hermetically separated from an inner space (3) in which the toroidal core (9), together with the sensor coils and the electronic system (15-19) is arranged.
Inventors
- 👤 Werner Wallrafen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:02
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01W; G01W1/00; Y; Y10; Y10S; Y10S33/00; Y10S33/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
331 words
In a contactless electronic angular-position transmitter for a rotatable mechanical member, in particular a weather vane, having a magnet coupled to said mechanical member and which is rotatable in proportion to the angle to be measured and having two sensor elements arranged at right angles to each other to be acted on by a magnetic field produced by the rotatable magnet so as to produce one electric signal each, each signal being a measure of one of two magnetic field components which are oriented at right angles to each other, the improvement comprising a toroidal core of a magnetic field detector developed in accordance with the flux-gate principle, and wherein a field produced by said magnet is substantially stronger than the earth's magnetic field, and each of the two sensor elements comprises at least one sensor coil wound about said toroidal core in a diametrical plane, said magnet being rotatable in a plane parallel to a plane of said core for magnetic interaction with the sensor coil in each of said sensor elements; the transmitter further comprising means enclosing said core and said magnet for excluding the earth's magnetic field, and an electronic system coupled to said sensor coils, and wherein said electronic system includes means for extracting a second harmonic component of a signal induced in a sensor coil for determination of angular position of the rotatable member, and said toroidal core and said rotatable magnet are positioned in a space which is substantially shielded from the terrestrial magnetic field by said field excluding means; the transmitter further comprising an exciter coil-disposed on said core, and wherein said rotatable magnet is positioned outside of a closed inner space; said toroidal coil, said sensor coils and at least a part of said electronic system coupled to said sensor coils being positioned within said closed inner space for evaluation of the two signals and for feeding said exciter coil, and said closed inner space is a closed-off subdivision of said first-mentioned space.
Claim 2
Dependent Claim
331 words
In a contactless electronic angular-position transmitter for a rotatable mechanical member, in particular a weather vane, having a magnet coupled to said mechanical member and which is rotatable in proportion to the angle to be measured and having two sensor elements arranged at right angles to each other to be acted on by a magnetic field produced by the rotatable magnet so as to produce one electric signal each, each signal being a measure of one of two magnetic field components which are oriented at right angles to each other, the improvement comprising a toroidal core of a magnetic field detector developed in accordance with the flux-gate principle, and wherein a field produced by said magnet is substantially stronger than the earth's magnetic field, and each of the two sensor elements comprises at least one sensor coil wound about said toroidal core in a diametrical plane, said magnet being rotatable in a plane parallel to a plane of said core for magnetic interaction with the sensor coil in each of said sensor elements; the transmitter further comprising means enclosing said core and said magnet for excluding the earth's magnetic field, and an electronic system coupled to said sensor coils, and wherein said electronic system includes means for extracting a second harmonic component of a signal induced in a sensor coil for determination of angular position of the rotatable member, and said toroidal core and said rotatable magnet are positioned in a space which is substantially shielded from the terrestrial magnetic field by said field excluding means; the transmitter further comprising an exciter coil-disposed on said core, and wherein said rotatable magnet is positioned outside of a closed inner space; said toroidal coil, said sensor coils and at least a part of said electronic system coupled to said sensor coils being positioned within said closed inner space for evaluation of the two signals and for feeding said exciter coil, and said closed inner space is a closed-off subdivision of said first-mentioned space.
Claim 3
Dependent Claim
28 words
The contactless electronic angular-position transmitter according to claim 1, wherein said field excluding means comprises a housing of magnetically shielding material, said space being formed by said housing.
Claim 4
Dependent Claim
300 words
In a contactless electronic angular-position transmitter for a rotatable mechanical member, in particular a weather vane, having a magnet coupled to said mechanical member and which is rotatable in proportion to the angle to be measured and having two sensor elements arranged at right angles to each other to be acted on by a magnetic field produced by the rotatable magnet so as to produce one electric signal each, each signal being a measure of one of two magnetic field components which are oriented at right angles to each other, the improvement comprising a toroidal core of a magnetic field detector developed in accordance with the flux-gate principle, and wherein a field produced by said magnet is substantially stronger than the earth's magnetic field, each of the two sensor elements comprises at least one sensor coil wound about said toroidal core in a diametrical plane, said magnet being rotatable in a plane parallel to a plane of said core for magnetic interaction with the sensor coil in each of said sensor elements, said toroidal core and said rotatable magnet are positioned in a closed inner space which is substantially shielded from the terrestrial magnetic field, said transmitter further comprising an exciter coil disposed on said core, an electric circuit coupled to said sensor coils, and a housing of magnetically shielding material enclosing said space, and wherein at least a part of said electric circuit is positioned within said closed inner space for evaluation of the signal of said sensor coils and for feeding said exciter coil, and wherein said rotatable magnet is positioned in a closed-off subdivision of said space, and wherein said electric circuit includes means for extracting a second harmonic component of a signal induced in a sensor coil for determination of angular position of the rotatable member.
Claim 5
Dependent Claim
300 words
In a contactless electronic angular-position transmitter for a rotatable mechanical member, in particular a weather vane, having a magnet coupled to said mechanical member and which is rotatable in proportion to the angle to be measured and having two sensor elements arranged at right angles to each other to be acted on by a magnetic field produced by the rotatable magnet so as to produce one electric signal each, each signal being a measure of one of two magnetic field components which are oriented at right angles to each other, the improvement comprising a toroidal core of a magnetic field detector developed in accordance with the flux-gate principle, and wherein a field produced by said magnet is substantially stronger than the earth's magnetic field, each of the two sensor elements comprises at least one sensor coil wound about said toroidal core in a diametrical plane, said magnet being rotatable in a plane parallel to a plane of said core for magnetic interaction with the sensor coil in each of said sensor elements, said toroidal core and said rotatable magnet are positioned in a closed inner space which is substantially shielded from the terrestrial magnetic field, said transmitter further comprising an exciter coil disposed on said core, an electric circuit coupled to said sensor coils, and a housing of magnetically shielding material enclosing said space, and wherein at least a part of said electric circuit is positioned within said closed inner space for evaluation of the signal of said sensor coils and for feeding said exciter coil, and wherein said rotatable magnet is positioned in a closed-off subdivision of said space, and wherein said electric circuit includes means for extracting a second harmonic component of a signal induced in a sensor coil for determination of angular position of the rotatable member.
References Cited (Backward Citations)
US3364740A
Cited
US3893337A
Cited
US4283679A
Cited
US4277751A
Cited
US4525670A
Cited
JPS58158502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |