Piezoelectric actuator capable of being powered off to keep displacement and time-sharing driving actuation method

Abstract

The invention discloses a piezoelectric actuator capable of being powered off to keep displacement and a time-sharing driving actuation method. The actuator comprises a shell, a rhombus ring which islocated in the shell, connected through a bottom screw and provided with an output rod, a plurality of piezoelectric stacks assembled on a long shaft in the rhombus ring, and an upper cover connectedto the shell. The upper cover comprises a through hole, and an output rod at the end of the long shaft of the rhombus ring is connected with an external structure through the upper cover through hole.In the actuator power-off displacement keeping interval, when the output rod retracts, negative voltage U1 is applied to each piezoelectric stack in sequence, then the negative voltage U1 is reducedto 0 V, the displacement d1 can be kept, and when the displacement d1 needs to be kept to be increased, the negative voltage U1 needs to be increased; when the output rod extends, forward voltage U2 is applied to each piezoelectric stack in sequence, then the forward voltage U2 is reduced to 0V, the displacement d2 can be kept, and when the displacement d2 needs to be kept increased, the forward voltage U2 needs to be increased. An effective solution is provided for power-off displacement keeping and high-precision actuation.

Description

technical field [0001] The invention relates to a piezoelectric material actuator, in particular to a piezoelectric actuator capable of maintaining displacement when power is cut off and an actuating method for time-sharing driving. Background technique [0002] Micro-displacement actuation and large-deformation actuation technology based on extremely high precision are the core technologies in the fields of scientific instruments, spacecraft precise pointing, material engineering, and high-precision machining. At present, most of the core actuation tasks are performed by piezoelectric materials. Piezoelectric materials can provide a material basis for precision adjustment, and cooperate with mechanisms to achieve high-precision displacement control. Actuators with power-off locking function developed based on the piezoelectric effect all require a locking mechanism, and most of them use electric components to drive the locking. However, due to the increase in the size of th...

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