Torque detector and torque detecting element

Details Torque detector and torque detecting element Torque detector and torque detecting element

1993-11-05

1995-07-11

Chilcot, Jr., Richard E.

Measuring and testing

Dynamometers

Responsive to torque

73862336, 73779, G01L 310

Patent

active

054310636

ABSTRACT:
The improved torque detector comprises a driven shaft 1 provided with a magnetostrictive magnetic member 2 and two sets of inductors 5a and 5b that are each composed of current paths which are formed in such a way that current will flow in directions that are at right angles to the two directions of main stress that develops on the surface of the driven shaft 1 when it receives an applied torque. The inductors are arranged in such a way that they are superposed in substantially the same axial position on a cylindrical plane that is spaced by a predetermined gap from the surface of the magnetic member 2. The detector detects the inductances of those inductors 5a and 5b to eventually determine the applied torque. Alternatively, a bias current is preliminarily supplied to the inductors and a current is impressed on a drive coil 17 that is wound around the driven shaft 1, whereupon a current or voltage is induced in those inductors and detected by the detector, thereby determining the applied torque. The torque detector is simple in construction and yet it is capable of correct torque detection without unduly affected by disturbances such as an axial temperature gradient, unbalanced external magnetic field and residual magnetic flux.

REFERENCES:
patent: 4590807 (1986-05-01), Kobayashi et al.
patent: 4817444 (1989-04-01), Yagi et al.
patent: 4899598 (1990-02-01), Gumaste et al.
patent: 4939937 (1990-07-01), Klauber et al.
patent: 4986137 (1991-01-01), Sato et al.
patent: 5092182 (1992-03-01), Ikeda et al.
patent: 5144846 (1992-09-01), Klauber et al.
patent: 5146790 (1992-09-01), Fish

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