Piezoelectric actuator, piezoelectric actuator control system and control method

The invention provides a piezoelectric actuator, a piezoelectric actuator control system and a piezoelectric actuator control method. The piezoelectric actuator comprises a bridge type amplification mechanism, a piezoelectric stack, a piezoelectric sensor, a fastener and a controller, the bridge type amplifying mechanism is of an axisymmetric hollow frame structure, and a group of elastic arms are symmetrically arranged on the two sides of the bridge type amplifying mechanism; a positioning groove is formed in the middle of the bridge type amplification mechanism, the piezoelectric stack is installed in the positioning groove, the piezoelectric sensor and the piezoelectric stack are pressed in the positioning groove together through the fastener, and the bridge type amplification mechanism is driven by stretching and retracting of the piezoelectric stack to generate vibration output; and the controller is in signal connection with the piezoelectric stack and the piezoelectric sensor. The piezoelectric actuato