Apparatus for measuring the magnitude of a load

Details Apparatus for measuring the magnitude of a load Apparatus for measuring the magnitude of a load

1985-07-12

1986-12-09

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

G01L 312

Patent

active

046272976

ABSTRACT:
An apparatus for measuring the magnitude of a load connected to a drive shaft includes a pulse motor for intermittently driving the drive shaft into rotation in response to a motor drive signal of a changing level. A torsion bar rotatively displacable in dependence upon the magnitude of an applied load is connected between the motor drive shaft and a rotary shaft of an object constituting the load to be measured. Arranged on the side of the load is a sensor for sensing the rotational position of the rotary shaft via the torsion bar. The magnitude of the load is measured based on a difference in phase between the motor drive signal and a signal from the sensor indicative of the rotational position of the rotary shaft. The phase difference is measured by a counter when the motor is in the unloaded condition, and again when the load to be measured has been connected. The load torque is then calculated by using a prescribed equation involving the two measured phase differences.

REFERENCES:
patent: 3495452 (1970-02-01), Johnson, Jr. et al.
patent: 3564909 (1971-02-01), Foskett et al.
patent: 4520681 (1985-06-01), Moore et al.

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