Spring-shaped piezoelectric ceramic actuator and method for acquiring large stroke
A technology of piezoelectric ceramics and actuators, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve problems such as small range of motion and small allowable strain, Achieve the effect of increasing application value
Active Publication Date: 2014-09-24
BEIHANG UNIV
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Problems solved by technology
However, due to its small allowable strain, although its output force can be large, its range of motion is small
The current piezoelectric ceramic actuator has a maximum output force of up to 50 tons, but it can only achieve millimeter-level movement
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[0020] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.
[0021] The invention discloses a spring-shaped piezoelectric ceramic actuator and a method for obtaining a large stroke. The shape of the spring-shaped piezoelectric ceramic actuator is the same as that of an ordinary spring, and the spring wire is a hollow tube formed of piezoelectric ceramics and electrodes. ; A spiral electrode is arranged around the wall of the hollow tube in the hollow tube, the electrode can generate strain in the hollow tube, and the strain can cause axial deformation of the spring. The simulation results prove that the axial expansion rate of the spring can be 80 times the maximum strain on the spring wire, so the spring-shaped piezoelectric ceramic actuator can obtain a larger motion stroke. The principle of the spring-shaped piezoelectric ceramic actuator is as follows:
[0022] (1) The spring-shaped piezoelectric cera...
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The invention provides a spring-shaped piezoelectric ceramic actuator and a method for acquiring large stroke. The shape of the spring-shaped piezoelectric ceramic actuator is the same as an ordinary spring, but the spring-shaped piezoelectric ceramic actuator is made from piezoelectric ceramic. The spring wire of the spring-shaped piezoelectric ceramic actuator is a hollow pipe formed through piezoelectric ceramic and electrodes. The wall of the hollow pipe is provided with helical electrodes. When a voltage is applied, the electrodes are strained in the hollow pipe, and the strain will cause the spring to undergo axial deformation. The simulation result shows that the axial expansion rate of the spring can be 80 times of the maximum strain on the spring wire. The invention provides a pring-shaped piezoelectric ceramic actuator, larger moving stroke can be acquired by adopting the spring-shaped piezoelectric ceramic actuator, so the moving stroke of a piezoelectric ceramic actuator can be greatly improved, and the application value of the piezoelectric ceramic actuator as the active control key component can be greatly improved.
Description
technical field [0001] The present invention relates to a large-displacement actuator of piezoelectric ceramics, more precisely, a piezoelectric ceramic actuator in the shape of a spring. The piezoelectric effect of the electroceramic causes stress inside the spring, which is amplified by the spring structure into the deformation of the spring, thus greatly improving the motion stroke of the piezoelectric ceramic actuator, which is a key component of active control. Background technique [0002] Actuators control the speed, displacement and force of the load by applying controllable forces such as pushing and pulling to the load, and are widely used in engineering fields such as aviation, aerospace and vehicles. Piezoelectric ceramic materials play an important role in the field of actuators due to their unique electric field-deformation effect. However, due to its small allowable strain, although its output force can be large, its range of motion is small. The current pie...
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Inventor 刘丰睿赵丽滨山美娟
Owner BEIHANG UNIV