Piezoelectric linear motor and its working method

Abstract

The invention provides a piezoelectric linear motor and a working method thereof. The piezoelectric linear motor comprises a bottom plate, wherein a bidirectional power output mechanism, a clamping mechanism and a driving mechanism are fixedly connected onto the bottom plate; the bidirectional power output mechanism comprises a movable pretightening rod and a fixed pretightening rod which are intersected in a crossing way; fixed pretightening blocks are connected with the two ends of the fixed pretightening rod respectively; movable pretightening blocks are connected with the two ends of the movable pretightening rod respectively; a piezoelectric actuating unit is connected between each fixed pretightening block and the adjacent movable pretightening block; the movable pretightening rod is connected with the clamping mechanism through an output shaft; the clamping mechanism is connected with the driving mechanism through a gear pair. Through application of the bidirectional power output mechanism, a relatively large thrust and a relatively large pull can be supplied synchronously in the output direction, and are almost equal; through thread clamping self locking, output displacement is accumulated, so that a relatively large stroke can be generated, and the motor has a relatively high position precision and has a power-off self-locking function.

Description

technical field [0001] The invention relates to the field of piezoelectric precision actuation instruments, in particular to a piezoelectric linear motor and a working method thereof. Background technique [0002] Piezoelectric linear motor is a new type of linear drive mechanism developed in recent years. It uses the inverse piezoelectric effect of piezoelectric materials and is made in a specific structural form. This kind of motor has the advantages of high efficiency in miniaturization, direct linear output, simple structure, fast response, high precision of position and speed control, and no electromagnetic interference. It can meet the high-tech requirements for precision positioning technology. Currently, researchers have developed a wide variety of piezoelectric linear motors, some of which have been commercialized. [0003] Piezoelectric linear motors can be divided into two types: resonant type and non-resonant type according to the different excitation methods of...

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Problems solved by technology

[0005] In order to solve the problem in the prior art that there is a large difference between the output thrust and the pull due to the weak tensile resistance of the piezoelectric stack, the present invention provides a piezoelectric linear motor and its working method, which can simultaneously provide a larger output direction. Push and pull, both of equal magnitude and capable of producing a greater stroke

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