Piezoelectric Actuator Multi-Layer Design for Low Voltage Drive
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Solution Overview
Problem
Existing piezoelectric actuators require high drive voltages, which is a limitation for reducing power consumption in electronic devices, necessitating a solution to lower the drive voltage while maintaining performance.
Innovation Solution
A piezoelectric actuator design featuring multiple layers of piezoelectric materials with alternating electrodes and a substrate, where the thickness of LNO thin films is optimized to achieve reduced drive voltage requirements, allowing for efficient deformation and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a traditional single-layer piezoelectric actuator is used, then the structure is simple, but the drive voltage is high
Solution Approach 1:
The piezoelectric actuator is divided into multiple layers (first piezoelectric layer, second piezoelectric layer, third piezoelectric layer) stacked on the substrate. Each layer has its own electrodes, allowing independent or combined actuation. This segmentation enables reduced drive voltage per layer while achieving the required total displacement, directly addressing the high power consumption issue.
Solution Approach 2:
The invention transitions from a single-layer planar structure to a multi-layer stacked configuration. By adding the vertical dimension with multiple piezoelectric layers, the actuator achieves the same or greater displacement output with lower voltage per layer, effectively reducing power consumption without sacrificing performance.
2Use of energy by moving object
If multiple piezoelectric layers are used, then the drive voltage is reduced, but the device complexity increases
Solution Approach 1:
Multiple piezoelectric layers are combined in a stacked configuration where the electrodes of adjacent layers are interconnected. The first and second electrodes form a first electrode pair, while the second and third electrodes form a second electrode pair. This merging allows the layers to work together as an integrated unit, achieving voltage reduction while managing complexity through unified electrode connections.
Solution Approach 2:
The multi-layer structure provides multiple functions: each layer can be actuated independently for fine control, or all layers can be actuated together for maximum displacement. The shared electrode connections allow the structure to serve both as a low-voltage actuator and as a controllable multi-position device, enhancing versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design achieves a significant reduction in drive voltage by approximately half compared to traditional actuators, maintaining equivalent displacement performance, thus addressing the power consumption challenge.
Implementation Method 1
Piezoelectric actuators utilizing the characteristics of piezoelectric material that exhibits deformation in response to application of voltage
Data Source
AI summary
A piezoelectric actuator includes a plurality of piezoelectric layers, a plurality of electrodes between which each of the piezoelectric layers is placed so that the electrodes and the piezoelectric layers alternate with each other, and a substrate on which the plurality of piezoelectric layers and the plurality of electrodes are formed.