Spring-shaped actuator for generating torsion deformation of spring wire by using shear deformation of piezoelectric element

A technology of piezoelectric actuators and piezoelectric elements, which is applied in the field of piezoelectric actuators and spring-like actuators, can solve the problems of small range of motion and small allowable strain, so as to improve the stroke distance and promote the application value , Improve stroke controllability and compatibility

Pending Publication Date: 2022-07-22
BEIHANG UNIV
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  • Application Information

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Problems solved by technology

However, although its output force can be large, it has the disadvantage of a small range of motion due to the small allowable strain.
For example, some piezoelectric actuators have a maximum output force of up to 50 tons, but they can only achieve millimeter-level movement.

Method used

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  • Spring-shaped actuator for generating torsion deformation of spring wire by using shear deformation of piezoelectric element
  • Spring-shaped actuator for generating torsion deformation of spring wire by using shear deformation of piezoelectric element
  • Spring-shaped actuator for generating torsion deformation of spring wire by using shear deformation of piezoelectric element

Examples

Experimental program
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Effect test

Embodiment approach 1

[0029] The shape of the piezoelectric element in Embodiment 1 can be changed arbitrarily, such as cylindrical, triangular prism, etc. After the piezoelectric element is changed, the frame connected to it also changes accordingly, for example: the piezoelectric element becomes a half-sector shape (such as image 3 (a)), the shear deformation direction of the piezoelectric element is as follows image 3 As shown by the dotted line in (a), the frame becomes a wedge-shaped block (such as image 3 (b)), the entire actuator is still spring-like (as in image 3 (d) shown). Alternatively, the piezo element becomes a half-wedge (e.g. Figure 4 (a)), the shear deformation direction of the piezoelectric element is shown by the dotted line in the figure, then the frame volume is zero, and the piezoelectric element directly forms a spring-shaped actuator (such as Figure 4 (c) shown). When the angle between the direction of shear deformation on 50% or more of the volume of the shear pi...

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Abstract

The invention provides a spring-shaped actuator for generating torsion deformation of a spring wire by shear deformation of a piezoelectric element. The piezoelectric device mainly comprises a shear-type piezoelectric element and a frame. The frame can be fixed to the shear type piezoelectric element, and the overall outline of the structure is in a spring shape after the shear type piezoelectric element is connected with the frame through the frame. After the shear type piezoelectric element generates shear 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 shear deformation direction of 50% or more of the volume of the shear 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, in particular to a spring-like actuator that uses a piezoelectric element to shear and deform to generate torsional deformation of a spring wire, which can realize large stroke displacement and belongs to the technical field of piezoelectric precision actuation. Background technique [0002] The actuator achieves control of the speed, displacement and force of the load by applying a controlled pull or pressure to the load. It is widely used in engineering fields such as aviation, aerospace and vehicles. Piezoelectric materials play an important role in the field of actuators due to their unique electric field-deformation effects. However, although the output force can be large, it has the disadvantage of a small range of motion due to the small allowable strain. For example, some piezoelectric actuators have a maximum output force of 50 tons, but can only achieve millimeter-level movement. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00H01L41/047H01L41/18
CPCH02N2/0045H10N30/87H10N30/85
Inventor 刘丰睿李重华史浩铭陈志凌王京骈瑢
Owner BEIHANG UNIV
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