Apparatus and method for transducing torque applied to a magneto

Details Apparatus and method for transducing torque applied to a magneto Apparatus and method for transducing torque applied to a magneto

1994-05-03

1996-06-04

O'Shea, Sandra L.

Measuring and testing

Dynamometers

Responsive to torque

324209, 324225, 324233, G01L 310, G01B 724, G01R 3318

Patent

active

055222692

ABSTRACT:
In an apparatus and method for generating a signal corresponding to a torque applied to a rotatable shaft according to the present invention, a compensation for a change in temperature causing the change in characteristics of the circuit elements including a magnetostriction shaft is carried out. In a preferred embodiment, a posistor whose resistance value is increased as the temperature is increased with respect to a normal temperature (20.degree. C.) is used for an input temperature sensitive resistor of an inverting amplifier connected to a center tap of a half bridge circuit constituted by a pair of coils constituting a torque sensor having the magnetostriction shaft so that an amplification factor of the inverting amplifier is adjusted so as to accord with the change in the temperature. When no torque is applied to the shaft, the center tap of the half bridge circuit provides no signal (zero voltage), this signal indicating a magnitude of a voltage signal generated due to a phase difference between applied triangular waveform voltages to the pair of coils with respect to the phase of a reference signal.

REFERENCES:
patent: 4013911 (1977-03-01), Fujiwara et al.
patent: 4414855 (1983-11-01), Iwasaki
patent: 4839590 (1989-06-01), Koski et al.
patent: 5307690 (1994-05-01), Hanazawa
patent: 5315881 (1994-05-01), Savage et al.

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