Sliding Magnet Wheel Adhesion Control for Secure Grip Release
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Solution Overview
Problem
Existing magnetic wheels struggle to achieve a strong magnetic grip on ferromagnetic surfaces while allowing for easy disengagement, necessitating the incorporation of a magnetic switch for vehicles like UAVs to prevent inadvertent disengagement.
Innovation Solution
A wheel system with sliding magnets and a clutch mechanism that controls magnetic adhesion by moving magnets into and out of apertures, using resilient members and pistons to generate or block magnetic flux, allowing for adjustable adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong magnetic adhesion is used to prevent inadvertent disengagement, then reliability is improved, but disengagement force requirement increases making operation difficult
Solution Approach 1:
The patent applies dynamics by making the magnetic adhesion strength adjustable rather than fixed. The wheel system can dynamically switch between high adhesion mode (for reliable attachment) and low adhesion mode (for easy disengagement) based on operational requirements, resolving the contradiction between needing strong grip and easy release
Solution Approach 2:
The patent changes the magnetic flux parameter by introducing an opposing magnetic field through coil windings. By controlling the current in these coils, the magnetic adhesion strength can be varied between strong and weak states, allowing the system to achieve both reliable attachment and easy disengagement by simply changing the magnetic field parameter
2Reliability
If magnetic adhesion is increased to ensure secure attachment, then reliability is improved, but the pulling force required to disengage increases
Solution Approach 1:
The patent changes the magnetic field parameter by introducing controllable coil windings that generate opposing magnetic flux. By adjusting the current in these coils, the overall magnetic adhesion force can be reduced to enable easy disengagement while maintaining strong attachment when needed, thus resolving the force contradiction
3Ease of operation
If a magnetic switch is incorporated to enable easy disengagement, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by making the coil windings serve dual purposes: they can generate magnetic fields to control adhesion strength and can also act as sensors to detect magnetic field changes. This eliminates the need for separate magnetic switch components, reducing overall device complexity while maintaining ease of operation
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 vehicles to securely adhere to and disengage from ferromagnetic surfaces efficiently, optimizing magnetic grip and disengagement through controlled magnetic flux manipulation.
Implementation Method 1
The magnetic adhesion is the result of magnetic flux passing through the surface from the magnet north pole to the magnetic south pole of a magnet in the wheel
Implementation Method 2
The air gaps block the magnetic flux of the plurality of magnets, thereby generating the second magnetic flux
Data Source
AI summary
A system and method control magnetic adhesion of a wheel to a ferromagnetic surface using sliding magnets, which slide in and out of a disc. Moving the magnets into the apertures generates a magnetic flux, increasing the magnetic adhesion. The system implements the method.