Study on driving force of vibrational friction motor

This chapter investigates the driving characteristics of the vibrational friction motors theoretically and experimentally. The driving force of this motor depends on both the vibrational condition of the stator and the contact condition between the stator and the rotor. First, the effects of the shape and vibration modes of the stator on the driving efficiency were analyzed by calculating the tangential velocity of the stator using FEM without considering the collision between the stator and the rotor. Next, the relationships between the conditions of the collision surface and t he driving force w ere measured with an experimental apparatus of which structural parameters were best tuned according to its dynamic model. These analyses and experiments helps in classifying the best conditions for the stator shape, vibration mode, and the collision surface. The Shaft vibrational friction motor has a high potential as an actuator for micro-sized memories and output devises since it has a simple structure and uses friction force that is a dominant force in micro domain.