Segmented Magnetic Coupling for Thin Sheet De-Stacking
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Solution Overview
Problem
Existing magnetic devices struggle to efficiently lift and hold thin ferromagnetic materials without causing unintended lifting of adjacent materials, particularly in de-stacking operations.
Innovation Solution
The use of pole shoes with spaced-apart projections and recesses in switchable magnetic devices, which create concentrated magnetic fields at the interface to lift thin materials while minimizing field penetration into adjacent materials, combined with actuators to switch between on and off states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a magnetic device uses a continuous magnetic field to lift ferromagnetic materials, then the holding force is strong, but adjacent materials are also lifted unintentionally
Solution Approach 1:
The pole shoe surface is segmented into multiple discrete projections rather than a continuous surface. Each projection creates a localized magnetic field that is concentrated at its base, allowing the magnetic force to be confined to specific contact points with the workpiece. This segmentation prevents the magnetic field from extending continuously to adjacent materials, thereby avoiding unintended lifting while maintaining strong holding force at each projection point.
Solution Approach 2:
The magnetic field strength is made non-uniform by concentrating it at the base of each projection where the workpiece contacts the pole shoe. The recesses between projections create regions of reduced magnetic field strength. This local variation in magnetic field quality ensures that adjacent materials experiencing lower field strength in the recess regions are not lifted, while materials in contact with projection bases experience sufficient holding force.
2Force
If the magnetic field penetrates deeply into ferromagnetic materials, then the magnetic coupling is strong, but de-stacking thin materials becomes difficult
Solution Approach 1:
The pole shoe is divided into multiple discrete projections with recesses between them. When lifting thin stacked materials, each projection contacts only the topmost workpiece at its base, creating a localized magnetic field that does not extend deeply into underlying materials. The recesses act as physical and magnetic barriers that prevent deep field penetration, allowing the top material to be lifted while leaving adjacent stacked materials undisturbed.
Solution Approach 2:
The projections extend in the vertical dimension from the pole shoe surface, creating a three-dimensional magnetic field distribution. The magnetic field is concentrated at the tip and base of each projection, with reduced intensity in the horizontal regions between projections. This dimensional arrangement allows the magnetic field to effectively couple with thin materials at the contact points while minimizing interference with adjacent materials in the stacked configuration.
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
Enhances the ability to de-stack thin ferromagnetic materials by maintaining a focused magnetic field at the interface, reducing the likelihood of lifting adjacent materials and improving de-stacking capabilities.
Implementation Method 1
one or more magnet(s) that is (are) rotatable relative to one or more stationary magnet(s), to generate and shunt a magnetic field
Implementation Method 2
the magnetic device establishes a first magnetic circuit with the at least one first permanent magnet and the at least one second permanent magnet through the plurality of pole sectors
Implementation Method 3
A switchable magnetic device may be used to magnetically couple the magnetic device to one or more ferromagnetic bodies
Data Source
AI summary
A magnetic device for magnetically coupling to a ferromagnetic body, comprises a housing having a central bore. A plurality of pole sectors arranged within an envelope of the central bore and forming a workpiece contact interface of the magnetic device, each of the plurality of pole sectors comprising a plurality of spaced-apart pole portions arranged at respective distances, wherein a recess of a plurality of recesses separates each pole portion of the plurality of pole portions, wherein a first sector forms a first pole of the magnetic device and a second sector forms a second pole of the magnetic device. A first permanent magnet. A second permanent being moveable relative to the first permanent magnet. And, an actuator operatively coupled to the at least one second permanent magnet to move the at least one second permanent magnet relative to the at least one first permanent magnet.