Segmented Micromechanical Actuator for High-Pressure Fluidics
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Solution Overview
Problem
Micromechanical fluidic devices, particularly those using piezo technology, face challenges with low flow rates and pressure due to miniaturization, and existing actuation mechanisms are cumbersome to manufacture and inefficient for fluidic tasks.
Innovation Solution
A planar micromechanical actuator design featuring a sequence of segments with changing bending directions and a neutral axis, utilizing multiple electrodes and spacers for efficient force distribution and high-frequency actuation, enabling improved pressure and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If micromechanical fluidic devices are miniaturized, then raw material usage is reduced, but flow rates and pressure decrease
Solution Approach 1:
The actuator is divided into multiple segments (first through fourth segments) with alternating bending directions. This segmentation allows the compact structure to generate sufficient mechanical displacement and pressure while maintaining miniaturized dimensions, thus preserving flow rates and pressure despite reduced size.
Solution Approach 2:
The patent utilizes the thickness direction (vertical dimension) by offsetting the gap from the neutral axis and configuring segments to bend in alternating directions above and below the neutral axis. This three-dimensional configuration enables the miniaturized actuator to achieve the mechanical performance of larger devices.
2Ease of operation
If piezoelectric technology is used for micromechanical devices, then actuation is achieved, but manufacturing becomes tedious and problematic
Solution Approach 1:
The patent replaces piezoelectric actuation with a mechanical/electrostatic actuation system using isolated electrodes that form capacitors. This substitution simplifies manufacturing by eliminating the need for piezoelectric material deposition and processing, while maintaining effective actuation capability through voltage-induced bending.
Solution Approach 2:
The actuation mechanism uses voltage application to electrodes to induce bending through electrostatic forces. By changing the electrical parameter (applying voltage), the actuator achieves mechanical displacement without complex piezoelectric manufacturing, thus improving ease of manufacture while preserving actuation capability.
3Stress or pressure
If segments are configured with alternating bending directions, then pressure per surface is improved, but structural complexity increases
Solution Approach 1:
The actuator is segmented into four distinct sections with alternating bending directions (first and fourth segments bend in one direction, second and third segments bend in the opposite direction). This segmentation enables the generation of high pressure per surface area while maintaining a relatively simple overall structure that can be manufactured using standard micromachining techniques.
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 design achieves high pressure and flow rates comparable to larger actuators, with a compact and efficient structure that facilitates faster actuation and reduced manufacturing complexity.
Implementation Method 1
Applying said voltage to the first and second electrodes induces charges on the first and second electrode. According to Coulomb's law, charges with opposing signs create an attractive force between said charged electrodes and like signed charges produce a repulsive force on said electrodes.
Implementation Method 2
The first to fourth segments are configured such that the planar micromechanical actuator deflects into the thickness direction by the first and fourth segment bending into the thickness direction and the second and third segments bending contrary to the thickness direction upon a voltage being applied
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
A planar micromechanical actuator suspended on opposing suspension zones comprising a neutral axis between the opposing suspension zones, first to fourth segments into which the planar micromechanical actuator is segmented between the opposing suspension zones, each comprising a first electrode and a second electrode which form a capacitor and are isolatedly affixed to each other at opposite ends of the respective segment along a direction between the opposing suspension zones so as to form a gap between the first and second electrode along a thickness direction, the gap being offset to the neutral axis along the thickness direction, and wherein the first to fourth segments are configured such that the planar micromechanical actuator deflects into the thickness direction by the first and fourth segment bending into the thickness direction and the second and third segments bending contrary to the thickness direction upon a voltage being applied to the first and second electrodes of the first to fourth segments.