Indirect Torque Measurement using Vibration Characteristics of Screw Motor

Abstract

This research presents indirect torque measurement by using vibration characteristics of a screw motor. The experimental test-rig consists of 2 parts: an electric screw driver for vibration generation and measurement and analysis unit for data collection and analysis.  There are 2 experimental test scenarios: torque measurement from generated vibration voltage levels in rms and from vibration ripples. These measured values of torque were compared with values measured by the standard torque-speed measurement. The test results showed that the torque values measured from vibration voltage levels in rms had values between 7.70-23.47 N.m compared to 13.38-29.30 N.m of standard values, which had R² of 0.7672 and accuracy of 84.27%. Alternatively, the torque values measured from vibration ripples had values between 13.82 – 29.30 N.m, which had R2 of 0.9786 and accuracy of 99.34%. These results revealed that measurement torque indirectly from motor’s vibration is feasible and effective. The proposed measurement by using vibration ripple provides better accuracy and precision than using vibration voltage level.