Measuring and testing – Dynamometers – Responsive to torque
Patent
1988-07-21
1990-07-10
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
G01L 310
Patent
active
049399373
ABSTRACT:
A noncontacting method for sensing torque based on the principle of magnetostriction comprises inducing a primary magnetic flux in a shaft (20) via such means as a primary excitation core/coil(30/32), keeping primary path flux amplitude constant via such means as an auxiliary core/coil (48/50) and appropriate feedback circuitry, and obtaining a torque dependent signal which is a function of a secondary flux via such means as a secondary core/coil(34/36). Signal dependence on RPM, temperature, and material property inhomogeneities is eliminated or minimized, instantaneous torque measurement is possible, and mass production is made feasible. A second embodiment utilizes modified signal processing circuitry to eliminate spurious signal components. A third embodiment comprises a single core/coil(58/60) placed close to a shaft (20) which detects torque by means of voltage or current changes in the coil (60). Embodiment four comprises two single core/coils(58/60 and 59/61) such as those of embodiment three and signal processing circuitry which produces a signal minimally affected by RPM, temperature, and material property inhomogeneities. A fifth embodiment employs a plurality of sensors (66A/66B) strategically located around the shaft (20) to eliminate spurious signals which are due to bending stress and shaft misalignment.
REFERENCES:
patent: 2365073 (1944-12-01), Haight
patent: 2553833 (1951-05-01), Rifenbergh
patent: 2912642 (1959-11-01), Dahle
patent: 3011340 (1961-12-01), Dahle
patent: 3340729 (1967-09-01), Scoppe
patent: 3681982 (1972-08-01), Hiratsuka et al.
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 3866462 (1975-02-01), Fraudin
patent: 4135391 (1979-01-01), Dahle
patent: 4414856 (1983-11-01), Winterhoff
patent: 4479390 (1984-10-01), Meixner
patent: 4503714 (1985-03-01), Winterhoff
patent: 4506554 (1985-03-01), Blonkvist et al.
patent: 4566338 (1986-01-01), Fleming et al.
patent: 4572005 (1986-02-01), Kita
patent: 4589290 (1986-05-01), Sugiyama et al.
patent: 4697459 (1987-10-01), Nonomura et al.
patent: 4697460 (1987-10-01), Sugiyama et al.
patent: 4716773 (1988-01-01), Nonomura et al.
patent: 4750371 (1988-06-01), Kobayashi et al.
R. A. Beth et al., "Measurement of Torque in a Rotating Shaft", Rev. Sci. Instr., vol. 25, No. 6, Jun. 1954, pp. 603-607.
International Search Report, European Patent Office, Oct. 17, 1989.
Abstract of Torque Sensor, Application No. 59-204900, 04/28/86.
Sae Paper #870472 "Measurement of Engine Torque With the Intra-Bearing Torque Sensor" Nonomura et al.
Klauber Robert D.
Vigmostad Erik B.
Ruehl Charles A.
SensorTech, L. P.
LandOfFree
Magnetostrictive torque sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetostrictive torque sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetostrictive torque sensor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1715006