LIANG Yu，WANG Yin，HUANG Wei-qing，LI Hai-lin
（State Key Laboratory of Mechanics and Control of Mechanical Structures，
Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China）
Abstract：To meet the requirement of phase controlled for S-type linear piezoelectric motor，a new type of driving power was designed.forThe design of a signal generator based on direct digital synthesizer（DDS）and programmable system on chip（PSOC3），providing 3-phasesin wave voltage signal with 120° phase difference was proposed. The CD4051 and LM358 was used as the main component to design the
PGA circuit. A linera power amplifier circuit was designed，and the problem of quick-discharge for the piezoelectric stack was solved. Theexperimental results demonstrate that the driving power is reliable for the s-type linear piezoelectric motor with long-time stability.
Key words：piezoelectric linear motor；driving power；programmable system on chip（PSOC）；direct digital synthesizer（DDS）；
programmable gain amplifier（PGA）