Vibration Characteristics Analysis for the Stator of Dynamic Friction Linear Piezoelectric Stack Motors

Abstract

To improve the output performance of piezoelectric linear motors, researches was carried on the vibration characteristic for the stator of dynamic-friction type non-resonant linear piezoelectric motors. By analyzing the construction and working mechanism of the motor, longitudinal vibration model was established for the stator of motor. Then the vibration differential equation of the drive tip was deduced and longitudinal displacement functions were proposed. Further, the prototype was fabricated and investigated by experiments on the longitudinal displacement of drive tip under different excitation conditions. Experiment results proved the vibration characteristic theory of stator that the longitudinal amplitude of drive tip increases with excitation voltage. The maximum amplitude of drive tip is 0.85μm and the output force is 3 N on condition that the operation voltage is 90 V and the frequency is 1.6 kHz. The above studies can provide theoretical basis for performance optimization of motor and for structural optimization of stator.

Working Mechanism of Nonresonance Friction in Driving Linear Piezoelectric Motors with Rigid Shaking Beam

“…The normal vibration displacement curves are tested under an excitation signal of 70 V and 600 Hz and an excitation signal of 90 V and 1400 Hz, respectively, as shown in Figures 13(a) and 13(b), respectively. The detailed measurement methods are indicated in another reference document [13].…”

“…When the Langevin-type transducers are substituted with a pair of piezoelectric stacks and the small-stiffness horn is changed into a rigid beam, a different linear piezoelectric motor can be obtained in nonresonance working condition [13]. Piezoelectric stacks have the characteristics of high precision and large deformation in nonresonance state; therefore, the motor can operate under nonresonance condition.…”