Electroadhesive Gripper for Diverse Object Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional robotic grippers face limitations in handling diverse objects due to reliance on suction or mechanical forces, which require specific surface conditions, are prone to leaks or damage, and are costly, especially when handling fragile or delicate items.
Innovation Solution
The use of electroadhesive surfaces and systems that apply electrostatic forces to adhere to objects, allowing for the manipulation of a wide range of items with minimal mechanical force, including fragile or dirty objects, using electrodes that induce electrostatic attraction when voltage is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If suction is used to grip objects, then gripping force is achieved, but surface conditions must be smooth, clean, dry and flat which limits the types and conditions of objects that can be gripped
Solution Approach 1:
The patent replaces the mechanical suction system with an electroadhesive system that uses electrostatic forces. The electroadhesive surface applies a uniform electric field to induce polarization in the object, creating attractive force without requiring surface contact or specific surface conditions. This substitution allows gripping of diverse objects including fragile, dirty, or irregularly shaped items that would be unsuitable for suction-based systems.
2Force
If suction is used to grip objects, then gripping force is achieved, but a lot of power is required for the pumps and the system is prone to leaks at any location on a vacuum or low pressure seal
Solution Approach 1:
The patent replaces the mechanical pump-based suction system with an electroadhesive system that uses electrical fields. Instead of continuously running pumps to maintain vacuum pressure, the system applies voltage to electrodes on the electroadhesive surface, inducing electrostatic attraction. This eliminates the need for high-power pumps and complex sealing systems, significantly reducing power consumption while maintaining reliable gripping force.
3Force
If mechanical actuation with large normal forces is used to grip objects, then gripping force is achieved, but the ability to robotically grip fragile or delicate objects is limited and large forces increase the cost of mechanical actuation
Solution Approach 1:
The patent changes the fundamental parameter of force application from mechanical contact force to electrostatic field force. The electroadhesive system applies distributed electrostatic forces across the object surface rather than concentrated mechanical pressures. This allows independent control of gripping force magnitude, enabling gentle handling of fragile objects while maintaining sufficient force for sturdy objects, thus expanding adaptability across different object types.
4Force
If mechanical actuation with large crushing forces is used to grip objects, then gripping force is achieved, but substantial weight is required which is a major disadvantage for applications such as the end of a robot arm
Solution Approach 1:
The patent replaces heavy mechanical actuation systems with lightweight electroadhesive actuators. Instead of using large motors, gears, and mechanical linkages to generate crushing forces, the system uses thin-film electrodes and dielectric layers that can be integrated directly into the robot arm end effector. This substitution dramatically reduces the weight of the gripping mechanism while maintaining the ability to generate sufficient holding force through electrostatic attraction.
5Speed
If conventional robotic arms and mechanical claws are used to handle objects, then objects can be moved, but damaging marks can still be left on the surface of the object
Solution Approach 1:
The patent replaces mechanical contact-based handling with non-contact electroadhesive handling. The electrostatic field extends slightly beyond the electroadhesive surface, allowing the object to be held and moved without direct mechanical contact. This eliminates scratching, denting, or marring of object surfaces while maintaining fast and precise handling capabilities, making it ideal for valuable or delicate items.
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 secure handling and movement of various objects without physical contact, reducing the risk of damage and increasing efficiency by using electrostatic forces, allowing for faster adhesion and detachment, and operating with reduced power consumption.
Implementation Method 1
electrodes that are configured to induce an electrostatic attraction with nearby objects when an appropriate voltage or current is applied to the electrodes
Data Source
AI summary
An electroadhesive gripping platform includes one or more electrodes. A power supply is configured to apply voltage to the one or more electrodes in the electroadhesive platform via one or more terminals. A controller is configured to operate the electroadhesive gripping platform to selectively adhere to items loaded thereon and thereby enhance traction control over such items. The controller can control the power supply to apply a voltage to the one or more electrodes in the electroadhesive platform to thereby cause the electroadhesive platform to adhere to an item disposed on the electroadhesive platform such that the item resists moving with respect to the electroadhesive platform. The controller can also control the voltage supply to reduce the voltage applied to the one or more terminals such that the item moves with respect to the electroadhesive platform.