Non-contacting shaft position sensor

Details Non-contacting shaft position sensor Non-contacting shaft position sensor

1982-05-24

1984-05-15

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

336 30, G01L 310

Patent

active

044480849

ABSTRACT:
To improve the output sensitivity of two concentric, telescopic sleeves (8, 9), respectively secured at their end portions to stub shafts (2, 5; 3, 4) which are aligned, and connected, for example, by a torsion element (1), so that torque being transmitted by the shafts through the torsion element can be determined, the sleeves are cut with axial slits (11, 16, 17) in which the cuts of one of the sleeves extend only over half the axial length and are offset with respect to each other, two windings (20, 21) being wound over a winding form (18) surrounding the outer one of the sleeves, and positioned centrally with respect to the half-slits (16, 17); upon applying high-frequency alternating current to the windings, and relative rotation of the sleeves, which will bring one of the half-slits in alignment with the axially extending slit (11) in the other sleeve, while rotating the other half-slit out of alignment, changes in inductance of the windings can be determined due to change in eddy currents being induced in the respective sleeve portions. The width (b) of the conductive sleeve portions (14, 15) to the width (a) of the slits which, effectively, form non-conductive circumferential portions, should be between 10:1 and 5:1, the spacing between the sleeves being as small as possible, for example in the order of 0.05 mm to 0.25 mm.

REFERENCES:
patent: 3329012 (1967-07-01), Demuth
patent: 3336525 (1967-08-01), Church
patent: 3729991 (1973-05-01), Hardway, Jr.
patent: 3823608 (1974-07-01), Pantermuehl et al.

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