Parallel Micro-Motion Platform for High-Precision Positioning
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Solution Overview
Problem
Current micro-motion platforms with series branch hinges suffer from poor rigidity, leading to parasitic elastic deformation and poor load-displacement linearity, affecting precision in positioning and measurement tasks.
Innovation Solution
A two-dimensional three-degree-of-freedom micro-motion platform structure utilizing a parallel moving mechanism with four branch hinges and piezoelectric drivers, where forces are applied through a leverage equivalent torque to amplify displacement and reduce parasitic elastic deformation, enhancing overall rigidity and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a series branch hinge is used to generate elastic deformation, then flexibility and displacement generation capability are improved, but rigidity deteriorates leading to center of rotation drift and poor load-displacement linearity
Solution Approach 1:
The series branch hinge is segmented into multiple independent flexible hinges (first flexible hinge, second flexible hinge, third flexible hinge) connected through rigid beams. Each flexible hinge is positioned at specific locations to distribute deformation, preventing center of rotation drift while maintaining displacement generation capability.
Solution Approach 2:
The invention transitions from a single-series-branch configuration to a parallel arrangement of multiple branch hinges. By distributing the flexible hinges across different spatial dimensions and connecting them through rigid beams, the system achieves both flexibility for displacement and rigidity for resisting parasitic deformation.
2Measurement precision
If rigidity is improved to resist parasitic elastic deformation, then load-displacement linearity and positioning accuracy are improved, but the moving range is reduced due to increased resistance against driving force
Solution Approach 1:
Rigid beams are introduced as intermediary elements connecting the flexible hinges. These rigid beams transmit forces and displacements between the flexible hinges while maintaining structural integrity, allowing the system to achieve both high rigidity for accuracy and sufficient moving range through the compliant motion of multiple flexible hinges.
Solution Approach 2:
Multiple branch hinges are merged into a unified parallel structure that shares the load and displacement requirements. This combination allows the system to achieve both high rigidity (through parallel support) and large moving range (through cumulative compliant motion of multiple flexible hinges working together).
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 platform achieves improved rigidity and load-displacement linearity, allowing for larger moving ranges and precise adjustments in both x and y directions, suitable for optical and mechanical precise positioning and measurement.
Implementation Method 1
the forces F1, F2, F3, and F4 are generated by driving a piezoelectric driver
Implementation Method 2
a principle is a technology that generates displacement based on elastic deformation of a compliant mechanism
Data Source
AI summary
A two-dimensional three-degree-of-freedom micro-motion platform structure for high-precision positioning and measurement. Two series flexible hinges are connected in parallel to form a moving pair. One end of the moving pair is fixed, and driving force is applied to the other end. The driving force is amplified by means of a lever to drive the moving pair to translate and rotate. The moving pair drives a first flexible hinge of a platform to rotate, thereby driving the platform to produce corresponding displacement. Four identical moving pairs and four identical first flexible hinges respectively constitute four branch hinges which are different in arrangement; two branch hinges opposite to the platform are in central symmetry and constitute one group, and the four branch hinges are divided into two groups in total. The piezoelectric driving mode can be adopted, and thus the linear displacement in the x-axis direction, the linear displacement in the y-axis direction and the angular displacement in the direction around the z-axis are generated for optical precision positioning and measurement.