An Inertial Piezoelectric Drive with an Electrodynamic Actuator

Abstract

In this paper, we study the performance of inertial linear-rotary piezoelectric drives under conditions that impede starting: lowered voltage, long idle time, high axial load, and the use of polymer materials. The application of an electrodynamic actuator for solving this problem is considered. The design of the passive actuator consisting of a magnet and a metal rod, as well as the actuator alignment procedure, is presented. Based on a system of electromechanical analogies, a model of an inertial drive with an electrodynamic actuator is described. This model was used to study a drive with an actuator, and the results of the study are presented. The actuator is shown to have two operation modes depending on the rotation direction of the drive. The features of the drive operation in these modes are described. In addition, the model showed that the actuator efficiency significantly decreases at small deformations of the piezoelectric element. In an active electrodynamic actuator, a magnet and a solenoidal coil are used to additionally affect the piezoelectric elements of the drive. The operation features of the active actuator are considered. A prototype of an inertial piezoelectric linear-rotary drive with an electrodynamic actuator is described, and the results of its tests and recommendations on the use of active and passive actuators are provided.