Measuring and testing – Dynamometers – Responsive to torque
Patent
1996-07-23
1998-01-13
Dougherty, Elizabeth L.
Measuring and testing
Dynamometers
Responsive to torque
73862333, G01L 302
Patent
active
057082162
ABSTRACT:
A torque sensor for providing an output signal indicative of the torque applied to a rotating torqued member comprises a magnetoelastically active element for producing a magnetic field varying with the applied torque and a field modulating means for modulating the magnetic field in a periodic manner which is indicative of the speed of member rotation. A magnetic field vector sensor, such as a Hall effect sensor, senses the amplitude of the modulated field for providing an output signal which is linearly indicative of the torque applied to the rotating member. The field modulating means preferably comprises at least one ring having some uniformly spaced salient feature, such as gear-like teeth, around the periphery thereof. In one embodiment, the magnetoelastically active element comprises a ring of material endowed with an effective uniaxial magnetic anisotropy such that the circumferential direction is the easy axis, and magnetically polarized in a substantially circumferential direction. The ring is attached to the torqued member, such as a rotating shaft, so that application of a torque to the shaft is transmitted to the ring. In another embodiment, the magnetoelastically active portion includes two or more axially distinct, magnetically contiguous, oppositely polarized circumferential regions.
REFERENCES:
patent: 2287796 (1942-06-01), Hall
patent: 2365073 (1944-12-01), Haight
patent: 2365565 (1944-12-01), Langer
patent: 2511178 (1950-06-01), Roters
patent: 2521905 (1950-09-01), Feller
patent: 3939448 (1976-02-01), Garshelis
patent: 4364278 (1982-12-01), Horter et al.
patent: 4523482 (1985-06-01), Barkhoudarian
patent: 4627298 (1986-12-01), Sahashi et al.
patent: 4656875 (1987-04-01), Uitermarkt
patent: 4760745 (1988-08-01), Garshelis
patent: 4805466 (1989-02-01), Schiessle et al.
patent: 4882936 (1989-11-01), Garshelis
patent: 4891992 (1990-01-01), Kodayashi et al.
patent: 4896544 (1990-01-01), Garshelis
patent: 4899598 (1990-02-01), Gumaste et al.
patent: 5052232 (1991-10-01), Garshelis
patent: 5182953 (1993-02-01), Ellinger et al.
patent: 5386733 (1995-02-01), Hesthamar et al.
Garshelis, "A Study of the Inverse Wiedmann Effect on Circular Remanence," IEEE Trans. on Magn., MAG-10 No. 2 344-358 (1974).
Garshelis, "The Wiedmann Effects and Applications," IEEE Applied Magnetics Conference, 75 CH0964-7 MAG, 38 pp. (1975).
Garshelis, "Conditions for Stress Induced Bulk Moments," J. Appl. Phys. 50(3), 1680-2 (1979).
Garshelis, "A Versatile Magnetostrictive Displacement Transducer," IEEE Industrial Electronics Control Instrumentation Conference, 76 CH1 117-1 IECI, 99-105 (1976).
Y. Nonomura, E.A., "Measurements of Engine Torque with the Inter-Bearing Torque Sensor," SAE Technical Paper 1988, pp. 2.329-2.339.
G. Reiniger, "Halbleitersensoren Fur Massenmarkte," Elektrontechnik, Jan., 1985, Wurzburg DE, pp. 199-202.
Dougherty Elizabeth L.
Friedman Stuart J.
Magnetoelastic Devices, Inc.
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