Sensor and method for measuring torque and/or axial stresses

Details Sensor and method for measuring torque and/or axial stresses Sensor and method for measuring torque and/or axial stresses

1992-06-29

1995-02-07

Chilcot, Jr., Richard E.

Measuring and testing

Dynamometers

Responsive to torque

73779, G01L 300

Patent

active

053867335

ABSTRACT:
The present invention relates to a sensor and to a method for measuring torque and/or axial stresses applied to an object as well as a method for manufacturing magnetoelastic material to be used therefore. The sensor (20) comprises a magnetoelastic material and a sensing device (210) for non-contactingly sensing changes in permeability of the magnetoelastic material due to torque and/or axial stresses, said sensing device (310) comprising a coil system carrying out both an excitation and a pick-up function. The excitation frequency is so chosen that the pre-dominating process of magnetization of the magnetoelastic material will be small angle magnetization rotation, the excitation frequency being at least 300 kHz.

REFERENCES:
patent: 4114428 (1978-09-01), Popenoe
patent: 4596150 (1986-06-01), Kuhr
patent: 4760745 (1988-08-01), Garshelis
patent: 4882936 (1989-11-01), Garshelis
patent: 5142227 (1992-08-01), Fish

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