Abstract
Numerical and experimental investigations of a multimodal piezoelectric traveling wave actuator are presented. The actuator consists of a cylindrical stator with a conical hole and piezoceramic rings that are located at the node of the first longitudinal and second bending vibration modes; one piezoceramic ring is also placed at the bottom of the actuator. The actuator is clamped at the bottom using a special supporting cylinder and a ball bearing. Traveling-wave-type vibrations are excited at the top surface of the cylinder by employing a superposition of the first longitudinal and second bending vibration modes of the stator. The conical hole of the stator is used to amplify the vibration amplitudes of the contact surface. Four electric signals with phase difference of π/2 are used to drive the actuator. Numerical and experimental investigations showed that the proposed actuator is able to generate up to 115 RPM rotation speed at constant preload force.
Highlights
Traveling wave actuators are one of the most popular piezoelectric devices that are used in numerous industrial, medical, and life-science fields [1,2]
A new type of traveling wave actuator based on a special waveguide was developed
The operation of the actuator is based on the superposition of the first longitudinal and second bending vibration modes
Summary
Traveling wave actuators are one of the most popular piezoelectric devices that are used in numerous industrial, medical, and life-science fields [1,2]. The modifications were made in order to increase the displacement amplitudes of the actuator and overcome buckling phenomena This actuator’s operation is based on synchronous traveling wave vibrations in the modified stator and rotor. The authors concluded that the proposed approach could increase the mechanical performance and design flexibility of simple traveling wave actuators, as well as overcome the disadvantages of tooth-based traveling wave actuators. The authors performed numerical and experimental investigations of the motor and concluded that the proposed motor can operate in both longitudinal and bending vibration modes. This work presents our further investigation into a traveling wave actuator with operation based on the superposition of the first longitudinal and second bending vibration modes of the waveguide [17]. Numerical and experimental investigations of the proposed piezoelectric actuator were performed in order to validate the operating principle, as well as to analyze the mechanical and electrical characteristics of the actuator
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