A magnetic-piezoelectric bidirectional stepping large displacement actuator and its actuating method

Abstract

A magnetic-piezoelectric bidirectional stepping large-displacement actuator and its actuation method, the actuator is composed of a shell, an external magnetizer, an internal magnetizer, a permanent magnet, a coil, a spring, and a piezoelectric amplification mechanism; realizing bidirectional The step-by-step action process is as follows: a uniform circular magnetic field is generated between the inner and outer magnetizers at both ends of the permanent magnet, the coil is located in the magnetic field, the outer end is connected to the first piezoelectric amplification mechanism, and the inner and inner magnetizers are connected by springs; the outer guide The magnet is connected to the second piezoelectric amplifying mechanism; when the piezoelectric amplifying mechanism is not energized, it is locked with the inner wall of the shell; the first piezoelectric stack is energized to release the lock; and then the current is applied to the coil to generate an ampere force to drive the first piezoelectric amplifying The mechanism moves; the first piezoelectric stack is powered off and locked, and the second piezoelectric stack is powered on to release the lock. The spring restoring force pulls the coil and the second piezoelectric amplification mechanism to move, realizing one-way movement; if the coil is applied in the opposite direction If the current is high, it will move in the opposite direction; in this way, it can realize two-way stepping output of large displacement and force.

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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