Microrobot Self-Assembly and Capillary End Effector Design
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Solution Overview
Problem
Current microrobot systems lack the ability to self-assemble and join with other microrobots to achieve sufficient force for certain tasks, and their end effectors often fail to effectively pick and place small objects due to issues with wetting surfaces drying out and surface rigidity.
Innovation Solution
A microrobot assembly system with a substrate containing conductive traces and a diamagnetic layer, allowing magnetic structures to move and assemble into microrobots, and an end effector with a capillary and wettable tip for reliable wetting and force application, enabling microrobot trains with enhanced force capabilities and improved end effector functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If microrobots are designed to move individually across diamagnetic surfaces, then flexibility and adaptability are improved, but force transmission capability deteriorates
Solution Approach 1:
The patent combines multiple individual microrobots into a unified microrobot train structure where multiple magnets are coupled together to form a coordinated system. This merging allows the train to transmit sufficient force for tasks that individual microrobots cannot accomplish, while maintaining the flexibility of individual unit control through the magnetic field.
2Reliability
If wetting is used for pickup end effectors, then gripping capability is improved, but reliability deteriorates due to drying out
Solution Approach 1:
The patent modifies the physical parameters of the end effector surface by incorporating capillary structures with specific dimensions and surface energy characteristics. These parameter changes enable the end effector to maintain liquid menisci and wetting forces over extended periods, preventing drying out while preserving strong gripping capability for small objects.
3Ease of manufacture
If simpler wetting surfaces are used for end effectors, then ease of manufacture is improved, but reliability deteriorates
Solution Approach 1:
The end effector incorporates capillary porous structures that can be manufactured using standard microfabrication techniques. These porous materials provide reliable wetting and gripping through capillary action while maintaining compatibility with existing manufacturing processes, balancing ease of manufacture with gripping reliability.
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
Enables self-assembly of microrobots and microrobot trains with increased force capabilities and reliable wetting and gripping of small objects, expanding the range of applications for microrobot systems.
Implementation Method 1
When a controller applies voltages to the traces, the resulting magnetic fields control the movements of the microrobots
Implementation Method 2
at least two magnetic structures movable across the diamagnetic layer in response to voltages applied to the conductive traces
Implementation Method 3
an end effector having a capillary, and a wettable tip
Data Source
AI summary
A microrobot assembly system includes a substrate containing conductive traces formed into at least one holding zone and one moving zone, a diamagnetic layer on the substrate, at least two magnetic structures movable across the diamagnetic layer in response to voltages applied to the conductive traces, wherein the holding zone holds one of the magnetic structures and the moving zone allows another of the magnetic structures to attach to the magnetic structure being held. The system may include a plate spaced above the substrate and rails to guide the moving magnetic structures.