Torque sensor

Details Torque sensor Torque sensor

1997-07-15

1998-09-22

Biegel, Ronald L.

Measuring and testing

Dynamometers

Responsive to torque

G01L 310

Patent

active

058116958

ABSTRACT:
In a torque sensor, coils and resistors constitute a bridge circuit, and the mutual connection part of the coils is connected to a power source via a coil drive unit. A control voltage, which varies in the square wave form, is supplied to the gate of a transistor in the coil drive unit so as to vary the voltage supplied to the coils in the square wave form. The output voltages which are the voltages between the coils and the resistors are input to the differential amplifier and the output voltage of the differential amplifier is held by a sample holding circuit to be supplied to a controller as the output voltage. The sample holding circuit holds the output voltage of the differential amplifier when the output voltages between the coils and the resistors are in the transient period. The controller detects the torque based on the output voltage of the sample holding circuit. An abnormal state monitoring unit is provided to detect an abnormal state of the coils.

REFERENCES:
patent: 4805463 (1989-02-01), Kelledes et al.
patent: 5578767 (1996-11-01), Chikaraishi et al.
patent: 5641916 (1997-06-01), Satoh et al.

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