Magnetic-piezoelectric bidirectional stepping type large-displacement actuator and actuation method thereof

Abstract

A magnetic-piezoelectric stepping type large-displacement actuator and an actuation method thereof. The actuator consists of a housing, an external magnetizer, an internal magnetizer, a permanent magnet, a coil, a spring and piezoelectric amplification mechanisms. The process for realizing bidirectional stepping type actuation is as follows: a uniform toroidal magnetic field is generated between the internal and external magnetizers at two ends of the permanent magnet, the coil is located in the magnetic field, an outer end is connected with the first piezoelectric amplification mechanism, and the interior is connected with the internal magnetizer through the spring; the external magnetizer is connected with the second piezoelectric amplification mechanism; the piezoelectric amplification mechanisms are locked to an inner wall of the housing when not electrified; a first piezoelectric stack is electrified, and locking is released; then current is applied to the coil, and Ampere force is generated to push the first piezoelectric amplification mechanism to move; the first piezoelectric stack is powered off and locked, a second piezoelectric stack is electrified and locking is released, and spring restoration force pulls the coil and the second piezoelectric amplification mechanism to move, thereby realizing unidirectional movement; and if current of an opposite direction is applied to the coil, reverse movement is realized; and thus bidirectional stepping type output of large displacement and force is realized.

Description

technical field [0001] The invention relates to the technical field of actuators, in particular to a magneto-piezoelectric bidirectional stepping large displacement actuator and an actuating method thereof. Background technique [0002] From the theory of electromagnetic field, it can be known that the conducting wire will be affected by the Ampere force in the magnetic field, and the magnetic actuator uses this phenomenon to directly convert the electrical energy into mechanical energy and output displacement and force. Magnetic actuators have excellent properties such as large stroke, fast response, uniform force and high acceleration, and are used in structural shock absorption, equipment positioning and other fields. [0003] The piezoelectric actuator based on the inverse piezoelectric effect has the advantages of high resolution, large output force, fast response, low power consumption, and light structure. Therefore, various actuators of piezoelectric materials have ...

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Problems solved by technology

[0004] However, due to the large output displacement of the magnetic actuator, the position control structure is complicated; the output displacement of the piezoelectric material is a micro-displacement

If large-displacement bi-directional output force is required, while having functions such as position control, small size, and light weight, it is difficult for traditional magnetic or piezoelectric actuators to meet all the above conditions.

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