US4907462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque sensor
Assignee: Toshiba Corp
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Filing: 1989-01-18
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Granted: 1990-03-13
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Expires: 2009-01-18
Abstract
Abstract In a torque sensor of a noncontact type, a pair of amorphous magnetic ribbons are bonded to a shaft to which a rotary torque is applied. A pair of coils are wound around the shaft and an alternating magnetic field is applied from the coils to the magnetic ribbons along the axis of the shaft. A permanent magnet and yokes are located around the shaft and a bias magnetic field is also applied from the magnetic to the magnetic ribbons through the yokes.
Inventors
- 👤 Masao Obama
- 👤 Masaaki Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:59
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/12; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/101; G01L3/102; G01L3/105
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
120 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft having an axis, the sensor comprising: a first magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft; means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbon; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbon; and means for detecting the magnetic fields passing through said magnetic ribbon to generate an output signal.
Claim 2
Dependent Claim
120 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft having an axis, the sensor comprising: a first magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft; means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbon; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbon; and means for detecting the magnetic fields passing through said magnetic ribbon to generate an output signal.
Claim 3
Dependent Claim
61 words
The torque sensor according to claim 1, said sensor further comprising: a second magnetic ribbon arranged close to said first magnetic ribbon and fixed to the shaft along the circumferential direction of the shaft, said second ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle -α in respect to the axis of the shaft.
Claim 4
Dependent Claim
38 words
The torque sensor according to claim 1, wherein said magnetic ribbon has a width W along the shaft and a length L along the circumferential direction of the shaft, the width W being smaller than the length L.
Claim 5
Dependent Claim
18 words
The torque sensor according to claim 1, wherein said magnetic ribbon surrounds the entire circumference of the shaft.
Claim 6
Dependent Claim
26 words
The torque sensor according to claim 1, wherein said biasing magnetic field generating means includes at least one permanent magnet for generating a biasing magnetic field.
Claim 7
Dependent Claim
25 words
The torque sensor according to claim 1, wherein said biasing magnetic field generating means includes at least one electromagnet for generating a biasing magnetic field.
Claim 8
Dependent Claim
26 words
The torque sensor according to claim 1, wherein said means for generating an alternating magnetic field includes an electromagnet for generating a high-frequency alternating magnetic field.
Claim 9
Dependent Claim
19 words
The torque sensor according to claim 1, wherein said detecting means includes a coil for detecting the magnetic field.
Claim 10
Dependent Claim
121 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft having an axis, the sensor comprising: a first amorphous magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbon; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbon; and means for detecting the magnetic fields passing through said magnetic ribbon to generate an output signal.
Claim 11
Dependent Claim
121 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft having an axis, the sensor comprising: a first amorphous magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbon; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbon; and means for detecting the magnetic fields passing through said magnetic ribbon to generate an output signal.
Claim 12
Dependent Claim
61 words
The torque sensor according to claim 9, said sensor further comprising: a second magnetic ribbon arranged close to said first magnetic ribbon and fixed to the shaft along the circumferential direction of the shaft, said second ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle -α in respect to the axis of the shaft.
Claim 13
Dependent Claim
38 words
The torque sensor according to claim 9, wherein said magnetic ribbon has a width W along the shaft and a length L along the circumferential direction of the shaft, the width W being smaller than the length L.
Claim 14
Dependent Claim
18 words
The torque sensor according to claim 9, wherein said magnetic ribbon surrounds the entire circumference of the shaft.
Claim 15
Dependent Claim
26 words
The torque sensor according to claim 9, wherein said biasing magnetic field generating means includes at least one permanent magnet for generating a biasing magnetic field.
Claim 16
Dependent Claim
25 words
The torque sensor according to claim 9, wherein said biasing magnetic field generating means includes at least one electromagnet for generating a biasing magnetic field.
Claim 17
Dependent Claim
26 words
The torque sensor according to claim 9, wherein said means for generating an alternating magnetic field includes an electromagnet for generating a high-frequency alternating magnetic field.
Claim 18
Dependent Claim
19 words
The torque sensor according to claim 9, wherein said detecting means includes a coil for detecting the magnetic field.
Claim 19
Dependent Claim
178 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft which has an axis and is made of a magnetic material, the sensor comprising: a first magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft; a second magnetic ribbon arranged close to said first magnetic ribbon and fixed to the shaft along the circumferential direction of the shaft, said second ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle -α in respect to the axis of the shaft; means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbons; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbons; and means for detecting the magnetic fields passing through said magnetic ribbons to generate an output signal.
Claim 20
Dependent Claim
178 words
A torque sensor of a noncontact type for sensing a rotary torque applied to a shaft which has an axis and is made of a magnetic material, the sensor comprising: a first magnetic ribbon fixed to the shaft along the circumferential direction of the shaft, said ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle α in respect to the axis of the shaft; a second magnetic ribbon arranged close to said first magnetic ribbon and fixed to the shaft along the circumferential direction of the shaft, said second ribbon comprising a magnetic material having an induced magnetic anisotropy in a direction of an angle -α in respect to the axis of the shaft; means for generating an alternating magnetic field along the shaft and applying the magnetic field to said magnetic ribbons; means for generating a constant biasing magnetic field along the shaft and applying the biasing magnetic field to said magnetic ribbons; and means for detecting the magnetic fields passing through said magnetic ribbons to generate an output signal.
Claim 21
Dependent Claim
40 words
The torque sensor according to claim 17, wherein each of said magnetic ribbons has a width W along the shaft and a length L along the circumferential direction of the shaft, the width W being smaller than the length L.
Claim 22
Dependent Claim
20 words
The torque sensor according to claim 17, wherein each of said magnetic ribbons surrounds the entire circumference of the shaft.
Claim 23
Dependent Claim
26 words
The torque sensor according to claim 17, wherein said biasing magnetic field generating means includes at least one permanent magnet for generating a biasing magnetic field.
Claim 24
Dependent Claim
25 words
The torque sensor according to claim 17, wherein said biasing magnetic field generating means includes at least one electromagnet for generating a biasing magnetic field.
Claim 25
Dependent Claim
26 words
The torque sensor according to claim 17, wherein said means for generating an alternating magnetic field includes an electromagnet for generating a high-frequency alternating magnetic field.
Claim 26
Dependent Claim
19 words
The torque sensor according to claim 17, wherein said detecting means includes a coil for detecting the magnetic field.
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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |