Cartwheel Flexure Actuator for Precision Linear Motion
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Solution Overview
Problem
Conventional actuators used in optical telescopes, such as those employing ball or lead screws, face challenges in achieving precise positioning over large distances with minimal friction and wear, as they are complex, heavy, and require lubricants, leading to imprecision and reduced reliability.
Innovation Solution
The actuator device incorporates a cartwheel flexure mechanism with a central moving carriage and cross-beams that provide flexibility and rigidity, coupled with a rotary and helical flexure system to convert rotational input into linear motion, eliminating the need for lubricants and reducing wear, using a stepper motor and harmonic drives for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional motor and screw designs (ball, roller, or lead screws) are used to achieve precise positioning, then positioning precision is improved, but device complexity and weight increase due to the large number of parts
Solution Approach 1:
The patent extracts and eliminates the screw mechanism from the actuator system, replacing it with a direct-drive motor design. This removal of the screw component significantly reduces the number of parts while maintaining positioning precision through the motor's direct coupling to the moving platform
Solution Approach 2:
The patent merges the motor directly with the moving platform, eliminating intermediate transmission components. This integration combines the motor's rotational output directly with the linear motion requirement, reducing part count while achieving precise positioning through the motor's inherent control capabilities
2Measurement precision
If conventional screw mechanisms are used for precise positioning, then positioning precision is improved, but weight increases due to the large number of parts
Solution Approach 1:
The patent removes the heavy screw mechanism and associated support structures, retaining only the essential motor and moving platform components. This extraction dramatically reduces actuator weight while preserving positioning precision through direct motor control
3Measurement precision
If conventional screw designs are used to achieve precise positioning, then positioning precision is improved, but reliability decreases due to friction and wear requiring lubricants
Solution Approach 1:
The patent eliminates the screw mechanism that causes friction and wear, replacing it with a direct-drive system. This removal of the problematic mechanical interface improves reliability by eliminating the sources of friction, wear, and lubricant contamination
Solution Approach 2:
The patent replaces the mechanical screw transmission system with a direct motor drive system. This substitution eliminates the mechanical interfaces that generate friction and wear, thereby improving reliability while maintaining positioning precision through electronic control
4Measurement precision
If conventional screw mechanisms are used for precise positioning, then positioning precision is improved, but the system requires lubricants which add complexity and maintenance requirements
Solution Approach 1:
The patent removes the screw mechanism that necessitates lubrication, eliminating the associated lubrication system and its complexity. The direct-drive design requires no lubricants, simplifying the overall system
Solution Approach 2:
The patent replaces the lubricated mechanical screw transmission with a direct motor drive system. This substitution eliminates the need for lubrication systems, reducing complexity and maintenance requirements while preserving positioning precision
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
This solution enables precise, low-friction, and long-lasting linear motion with minimal backlash and hysteresis, allowing for precise positioning of optical components over large distances with reduced component wear and complexity, enhancing the actuator's lifespan and accuracy.
Implementation Method 1
A plurality of cross-beams flexibly support the central moving carriage from the frame, wherein the plurality of cross-beams provide flexibility for movement of the central moving carriage relative to the frame along the axis
Data Source
AI summary
An actuator device includes a cartwheel flexure having a central moving carriage component configured for parallel motion along an axis of the actuator device. A frame is configured to remain stationary relative to the central moving carriage component. A plurality of cross-beams flexibly support the central moving carriage from the frame, wherein the plurality of cross-beams provide flexibility for movement of the central moving carriage relative to the frame along the axis and provide rigidity in other directions.