抄録
In order to design the Ultrasonic motor (USM) which provides higher performance to be responsible to various specifications, it is indispensable to understand and control friction drive force properties at the contact interface between driven rail and drive tip of the USM. Furthermore, an evaluation parameter for frictional drive force of the USM has been strongly required. In this research, by using newly developed method, frictional driving force of the USM and relative micro slip at the contact interface between the pin and the rail during operating the USM were successfully measured for the first time in the world. Usefulness of "tangential force per unit relative micro slip distance", which was calculated from the measured values mentioned above, was proved as evaluation parameter for the frictional drive force of the USM.
