Switchable Halbach Array Magnetic End Effector for Fail-Safe Grip
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Solution Overview
Problem
Conventional robotic grippers that require power to secure objects may abruptly release them if electricity is interrupted, leading to potential object loss and increased complexity with mechanical backup systems.
Innovation Solution
A magnetic end effector utilizing a switchable Halbach array with a rack and pinion switching system to re-orient magnets, allowing for secure or release of ferromagnetic and ferrimagnetic objects by adjusting the magnetic field, ensuring grip maintenance without power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional robotic grippers use power-dependent mechanisms to secure objects, then the gripper can actively control grip strength and release objects, but the gripper may abruptly release objects when power is interrupted and requires complex mechanical backup systems
Solution Approach 1:
The patent replaces power-dependent mechanical actuation systems with a passive magnetic field-based gripping mechanism. The Halbach array generates magnetic fields that securely hold ferromagnetic objects without requiring continuous power supply, eliminating the need for complex mechanical backup systems while maintaining reliable grip retention.
Solution Approach 2:
The patent employs switchable Halbach arrays that can alter their magnetic field configuration by changing the orientation of magnets through a rack and pinion mechanism. This allows the system to switch between different magnetic field states (strong grip vs. weak/no grip) without requiring continuous power, thereby improving reliability while simplifying the overall system architecture.
2Reliability
If a robotic gripper uses a switchable Halbach array with rack and pinion mechanism, then the gripper can maintain grip without power supply, but the gripper mechanism becomes more complex
Solution Approach 1:
The patent extracts the power-dependent actuation function from the gripping mechanism and replaces it with a passive magnetic field system. The rack and pinion mechanism is used only for switching between predefined magnetic states rather than continuous actuation, thereby reducing overall system complexity while maintaining fail-safe grip capability.
3Adaptability or versatility
If the Halbach array magnets are re-oriented to flip strong and weak sides of magnetic field, then the end effector can alternatingly secure or release objects, but the switching mechanism requires additional mechanical components
Solution Approach 1:
The patent implements a dynamic switching mechanism using rack and pinion gears that allow the Halbach array magnets to be re-oriented between different configurations. This enables the system to alternate between secure grip and release states by flipping the strong and weak sides of the magnetic field, providing adaptability while using a relatively simple mechanical switching approach.
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 magnetic end effector provides a fail-safe mechanism to securely hold objects even when power is lost, reducing complexity and cost by relying on magnetic forces for grip retention.
Implementation Method 1
A magnetic end effector may include a plate with a switchable Halbach array embedded therein or arranged thereon
Implementation Method 2
astrictive grippers may secure an object by creating a vacuum between the gripper surface and the object, or by utilizing magneto-adhesion or electro-adhesion between the gripper surface and the object
Implementation Method 3
A rack and pinion switching system may be operable to re-orient the magnets in the Halbach array and flip the strong and weak sides of the Halbach array's magnetic field
Implementation Method 4
magnetic fields of the first and second switchable Halbach systems pull the first member and the second member towards each other
Data Source
AI summary
A magnetic end effector utilizing a switchable Halbach array includes a pair of opposing members that can move towards and away from each other. The switchable Halbach arrays are located on or near the inner surface of the opposing members. A mechanical switching system is used to control the switchable Halbach arrays by moving one or more magnets that make up the switchable Halbach arrays. When manipulated in a certain way, the switchable Halbach arrays cause the opposing members to move towards each other, and when manipulate in a different manner, cause the opposing members to move away from each other.