This study investigated the uncertainty evaluation procedure in the dynamic torque realised by a dynamic torque generating machine (DTGM) based on an electromagnetic force under development at NMIJ. The dynamic torque can be generated by changing the applied current. The generated torque can be traceable to the International System of Units (SI) by referring to the national standards of voltage, current, angle, and frequency.

A reference torque calibration machine (RTCM) has been developed to validate the calibration of efficient torque transducers. In this study, the calibration and measurement capability (CMC) of the RTCM was evaluated based on the technical guideline. We also compared the RTCM and a 10 N•m deadweight torque standard machine at the National Metrology Institute of Japan (NMIJ) using a torque measuring device with a nominal capacity of 1 N•m.