DEVELOPMENT OF NOVEL TOOTH-MATCHING LINEAR PIEZOELECTRIC ACTUATOR

This paper proposes a new concept ofpiezoelectric actuator. It is different from ordinary piezoelectric actuators which are actuated byfriction, and wear becomes a major problem in longterm use. The main purpose ofthis research is to drive the motor without friction. Hence, the actuator driven by resonance force is proposed here. The foundation of the actuator is based on piezoelectric material which possess the inverse piezoelectric effect itself. The axial deformation of piezoelectric material is worked as excitation here, which makes the stator subjected to mutative equivalent force along the time. At the same time, the input frequency of sinusoidal voltage is controlled and applied to the stators which makes the stators resonated and in contact with motor for pushing the motor forward. In addition to proposing the preliminary design concept oflinear piezoelectric actuator, the dynamic model of the piezoelectric actuator system isfirstly studied by Hamilton's Principle. Then, thefinite element method is used to calculate the modal analysis ofstator. Finally, the prototype is fabricated and experiment platform is established. The vibration response of stators is measured by laser Doppler vibration measuring system, which is able to verify reasonableness of the constructed finite element model andfeasibility oflinear piezoelectric actuator.