Projected Pole Shoes for Magnetic Sheet De-Stacking
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Solution Overview
Problem
Switchable magnetic devices face challenges in effectively de-stacking thin ferromagnetic materials due to inadequate magnetic field concentration and holding force, particularly when dealing with sheets of varying thicknesses.
Innovation Solution
The design incorporates pole shoes with projections and recesses that create a shallow magnetic field, allowing for efficient lifting and holding of ferromagnetic workpieces by concentrating the magnetic field near the interface and minimizing its penetration deeper into the stack, thereby enhancing de-stacking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the magnetic field penetrates deeper into the stack, then more ferromagnetic materials are attracted, but the holding force near the interface is reduced and thin materials cannot be effectively de-stacked
Solution Approach 1:
The pole shoe surface is designed with localized protrusions that concentrate the magnetic field specifically at the interface region where contact with the ferromagnetic material occurs. This creates a non-uniform magnetic field distribution with higher flux density at the protrusion tips, enhancing holding force locally without increasing overall field penetration into the stack.
Solution Approach 2:
The pole shoe surface is segmented into multiple protrusions rather than a continuous surface. This segmentation allows the magnetic field to be concentrated at discrete locations, creating multiple localized high-flux regions that improve interface holding force while limiting overall field penetration depth into the ferromagnetic stack.
2Force
If the magnetic field is concentrated near the interface, then holding force is improved, but the ability to attract thicker materials is reduced
Solution Approach 1:
The magnetic device incorporates adjustable pole shoe positioning mechanisms that allow the protrusions to be moved or reconfigured based on the thickness of the ferromagnetic material being handled. This dynamic adjustment capability enables the same device to effectively handle a range of material thicknesses by optimizing the magnetic field concentration pattern for each specific application.
Solution Approach 2:
The pole shoe design with adjustable or reconfigurable protrusions allows a single magnetic device to perform multiple functions - handling both thin sheets requiring concentrated interface fields and thicker materials requiring deeper field penetration. The universality is achieved through the ability to modify the magnetic field distribution pattern to match different workpiece geometries.
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
This configuration provides a stronger holding force near the workpiece interface while minimizing magnetic field penetration deeper into the stack, effectively de-stacking thin materials and improving the overall efficiency of magnetic coupling devices.
Implementation Method 1
A switchable magnetic device may include 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
magnetic device for magnetically coupling to a ferromagnetic body
Implementation Method 3
the pole shoes comprise a plurality of projections, which facilitate creating shallow magnetic fields in a ferromagnetic workpiece to be moved with the magnetic device, the shallow magnetic field having sufficient holding force to lift the coupled ferromagnetic workpiece
Data Source
Figure 1A
Figure 1B
Figure 1C
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.