关键词: 直线电机, 压电电机, 纵振模态, 夹心换能器

Abstract:

A linear piezoelectric motor was designed by the first order longitudinal mode. The oscillator was composed of transverse and longitudinal rod vibration bodies, and there were orthogonal connection. The structure of the vibration body was high strength sandwich transducer. The two transducers of the transverse vibration body generate antisymmetric vibration to increase the output force of transverse vibration. When the transverse and longitudinal vibrations exert sinusoidal excitation signals with a phase difference of 90 degree, an elliptical motion was generated on the drive foot to push the slider to move. The optimum working frequency of the motor was obtained by swept frequency experiment, and which was 29.3 kHz. When the excitation signal with a frequency of 29.3 kHz and a peak value of 250 V was applied, the driving force of the slider could reach 8 N, and the no-load speed of the slider could reach 150 mm/s.

Key words: linear motor, piezoelectric motor, longitudinal mode, sandwich transducer