Torque measuring device by integral shaft based upon inverse mag

Details Torque measuring device by integral shaft based upon inverse mag Torque measuring device by integral shaft based upon inverse mag

1998-09-22

2000-08-08

Noori, Max

Measuring and testing

Dynamometers

Responsive to torque

G01L 302

Patent

active

060984686

ABSTRACT:
In a torque measuring device having a shaft member bearing circumferentially circulating magnetic fluxes along its outer circumferential surface and adapted to measure a torque applied to the shaft member around its central axis by measuring a distortion of the magnetic fluxes caused by the torque according to an inverse magnetostriction, the shaft member has a principal cylindrical portion axially terminating in an annular end face perpendicular to the central axis, whereby a high density of magnetic fluxes corresponding to the axial length of the principal portion are generated to traverse the annular end face, so as to be detected by a magnetic field sensor to produce an output signal at a high S/N ratio. By forming a less stressed cylindrical portion axially adjacent to the principal cylindrical portion to present a second annular end face opposing the end face of the principal portion, and comparing a density of the magnetic fluxes generated to traverse the second end face with that of the principal cylindrical portion, a hysteresis free torque measurement is available.

REFERENCES:
patent: 4882936 (1989-11-01), Garshelis
patent: 5321985 (1994-06-01), Kashiwagi et al.
patent: 5412999 (1995-05-01), Vigmostad et al.
patent: 5591925 (1997-01-01), Garshelis
patent: 5831180 (1998-11-01), Tanaka et al.
patent: 5880379 (1999-03-01), Tanaka et al.
O. Dahle, "The Ring Torductor--A Torque-Gauge, Without Slip Rings, For Industrial measurement and Control," ASEA Journal, 1960, vol. 33, No. 3, pp. 23-32.

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