A novel linear piezoelectric motor with complex vibration modes

This work describes a new type of piezoelectric motor that can be employed for both linear and rotary displacements. Although inspired on a classical "V-type" configuration, its long and thin stator tip can oscillate with relatively high amplitude and in several mode combinations. Two piezostacks are used to vibrate the stator accordingly. Movement in both directions can be achieved by driving each stack independently. The driving circuit is based on half-bridge inverter circuit. Parameters affecting speed control, as well as unbalance due to fabrication inaccuracy are analyzed.