Torque sensor

Details Torque sensor Torque sensor

1990-06-04

1992-09-15

Woodiel, Donald O.

Measuring and testing

Dynamometers

Responsive to torque

73779, 324209, G01L 302

Patent

active

051467909

ABSTRACT:
Torque in a shaft is measured by a torque sensor comprising at least one strain gage. The strain gage has a magnetic circuit comprising a magnetostrictive, soft ferromagnetic element. A drive mechanism applies a first and a second magnetomotive force to the magnetic circuit. The second magnetomotive force has a sense opposite that of the first magnetomotive force. A sensing mechanism senses the state of magnetization of the ferromagnetic element and a detecting mechanism determines the magnitude of that magnetic field applied to the ferromagnetic element by the second magnetomotive force which reduces the magnetization of the element to zero. Torque is derived from the strain indicated by a change in the coercive field of the ferromagnetic element.

REFERENCES:
patent: 3302456 (1967-02-01), Guerth
patent: 4414855 (1983-11-01), Iwasaki
patent: 4523482 (1985-06-01), Barkhoudarian
patent: 4596150 (1986-06-01), Kuhr
patent: 4931729 (1990-06-01), Pratt
Sasada et al., IEEE Trans. Magn. MAG-20, 951 (1984), "Torque Transducers with Stress-Sensitive Amorphous Ribbons of Chevron . . . ".

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