Realization of a Microtorque Standard by Using an Electromagnetic Force Type Torque Standard Machine
Atsuhiro Nishino
Abstract:
In order to realize a microtorque standard, we investigated the principle of a torque generating method using an electromagnetic force by referring to watt balance experiments for the redefinition of the kilogram. Then, we have developed an electromagnetic force type torque standard machine (EMTSM), and the SI traceable torque was successfully realized for the first time using a method which does not refer to the gravitational force. In this study, we studied on the realization of torque less than 1 mN·m based on this principle. As a result, torque down to 0.3 µN·m was successful realized by using a highly accurate programmable voltage/current source.
Keywords:
torque, torque standard, microtorque, watt balance, electromagnetic force
