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Actuator for converting tension and compression deformation of piezoelectric element into spring deformation

A technology of piezoelectric actuators and piezoelectric components, which is applied to electrical components, piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, etc. problem, to achieve the effect of realizing large stroke control and increasing the stroke distance

Pending Publication Date: 2022-07-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the piezoelectric actuator has an output force of tens of tons, its working stroke is generally difficult to break through the order of millimeters.

Method used

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  • Actuator for converting tension and compression deformation of piezoelectric element into spring deformation
  • Actuator for converting tension and compression deformation of piezoelectric element into spring deformation
  • Actuator for converting tension and compression deformation of piezoelectric element into spring deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] A spring-shaped actuator scheme with a rectangular parallelepiped piezoelectric element and a helical hollow frame includes a piezoelectric element and a frame. Piezoelectric elements such as figure 2 As shown in (a), a single piezoelectric element such as figure 2 As shown in (b), the angle between the deformation direction of the piezoelectric element and the axis direction of the spring wire is 45°. frame as figure 2 (c). Combined spring-shaped actuators such as figure 2 (d). The tension-compression piezoelectric element of the above scheme has an included angle of less than 40° between the direction of the tension-compression deformation on 50% or more of the volume and the direction of the principal strain after the deformation occurs when the spring is not electrified.

[0027] Another variation of the implementation

[0028] The shape of the piezoelectric element in Embodiment 1 can be changed arbitrarily, such as a cylindrical shape, a triangular prism...

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Abstract

The invention provides an actuator for converting tension and compression deformation of a piezoelectric element into spring deformation. The device mainly comprises a tension-compression type piezoelectric element and a frame. The frame can be fixed with the tension-compression type piezoelectric element, so that the overall outline of the structure is in a spring shape after the tension-compression type piezoelectric element is connected with the frame. After the tension-compression type piezoelectric element generates tension-compression deformation, deformation is accumulated and amplified due to the spring-shaped shape, and large deformation of the spring-shaped piezoelectric actuator is caused. On the premise of ensuring that the final actuator is in a spring shape, the shape of the piezoelectric element can be arbitrary, and correspondingly, the shape of the frame can be arbitrary. The final shape of the spring can also be arbitrary, and the spring can be called as a spring. According to the scheme, when the included angle between the tension and compression deformation direction of 50% or more of the volume of the tension and compression type piezoelectric element and the main strain direction at the position after the spring is deformed when the spring is not powered up is smaller than 40 degrees, the actuator is obtained.

Description

technical field [0001] The invention relates to a piezoelectric actuator. The actuator is characterized in that the principle of the spring is used to gradually accumulate and amplify the main strain of the spring wire to form the deformation of the spring, which can realize large stroke displacement and belongs to the piezoelectric precision actuation technology. field. Background technique [0002] As a travel control mechanism, the actuator can realize the control of the speed, displacement and force of the load, and has been widely used in the fields of aviation, aerospace, vehicles and semiconductors. Piezoelectric materials have inverse piezoelectric effect, that is, piezoelectric materials produce corresponding deformations after applying a voltage, so the load of piezoelectric actuators can be actively controlled by controlling the voltage magnitude and changing frequency of the electrodes on the piezoelectric materials. Piezoelectric actuators are an advanced categ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00
CPCH02N2/005H02N2/0075
Inventor 刘丰睿王京李重华史浩铭陈志凌夏开心
Owner BEIHANG UNIV
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