Piezoelectric drive, motor, robot, and liquid feed pump

摘要

PROBLEM TO BE SOLVED: To provide a piezoelectric drive device being excellent in driving efficiency and having low power consumption.SOLUTION: A piezoelectric drive device 100 comprises: a piezoelectric element group 14 having four or more piezoelectric elements 10; wiring 12 being a part of the piezoelectric element group, the wiring 12 for transporting electric charges among a plurality of piezoelectric elements 10; a switch 20 switching between a state where the plurality of piezoelectric elements 10 is electrically connected to one another via the wiring 12 and a state of disconnection thereamong; and a control section 22 controlling the switch 20. The control section 22 controls the switch 20 such that electric potential of a first piezoelectric element 10a is a power-supply voltage, electric potential of a second piezoelectric element 10b is a GND, and electric potential of the other piezoelectric elements 10 is between the power-supply voltage and the GND.SELECTED DRAWING: Figure 1