Switchable Magnetic Coupling with Segmented Pole Shoes for Thin Sheets
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Solution Overview
Problem
Switchable magnetic devices face challenges in effectively de-stacking thin ferromagnetic materials due to the penetration of magnetic fields into multiple sheets, leading to inadequate holding force and inefficient material handling.
Innovation Solution
The design incorporates pole shoes with spaced-apart projections and recesses that create a shallow magnetic field, confining the magnetic flux to a specific interface, allowing for efficient lifting and holding of ferromagnetic workpieces while minimizing shear forces during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a magnetic device uses a conventional pole shoe design with continuous contact surface, then the magnetic field penetrates into multiple sheets, but the holding force becomes insufficient and multiple sheets get coupled together
Solution Approach 1:
The pole shoe is segmented into multiple discrete projections spaced apart from each other, replacing the continuous contact surface. This segmentation creates localized magnetic field zones that concentrate flux at specific points, preventing field penetration into multiple sheets while maintaining strong holding force at each contact point.
Solution Approach 2:
The magnetic field distribution is made non-uniform by concentrating flux at discrete projection locations rather than distributing it evenly across a continuous surface. This local concentration of magnetic flux enhances holding force at contact points while creating field-free zones between projections that prevent coupling of multiple sheets.
2Force
If the magnetic field is concentrated at a specific interface to improve holding force, then the field depth is reduced, but the ability to hold thin materials against shear forces must be maintained
Solution Approach 1:
Multiple discrete projections distribute the holding force across several localized contact points rather than relying on a single continuous interface. This segmentation allows each projection to generate sufficient local flux concentration for strong holding while the collective array of projections provides distributed support against shear forces during transport.
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 enhances the holding force on thin materials, improves de-stacking capabilities, and reduces the likelihood of multiple sheets being coupled, thereby optimizing material handling and transport processes.
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
magnetic device to magnetically couple to a ferromagnetic body
Implementation Method 3
at least one second permanent magnet 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
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.