Switchable Magnetic Coupling with Segmented Pole Shoes for De-Stacking
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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 the top sheet and preventing it from penetrating to lower sheets, allowing for efficient lifting and de-stacking of thin materials.
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 sufficient, but the magnetic field penetrates multiple sheets causing inadequate de-stacking capability
Solution Approach 1:
The pole shoe surface is segmented into multiple discrete projections spaced apart from each other. This segmentation creates localized magnetic field regions at each projection tip, confining the magnetic flux to penetrate only the top sheet at specific contact points rather than continuously across the entire surface, thereby enabling effective de-stacking while maintaining holding force.
Solution Approach 2:
The magnetic field distribution is made non-uniform by concentrating flux at the tips of the spaced-apart projections. This creates local high-density magnetic field regions at the projection tips that contact the top sheet, while leaving gaps between projections where the magnetic field does not penetrate lower sheets. This local quality differentiation enables selective engagement with the top sheet for de-stacking operations.
2Quantity of substance
If the magnetic field penetrates deeply into stacked materials, then multiple sheets are engaged, but the top sheet cannot be separated from lower sheets
Solution Approach 1:
By segmenting the pole shoe into spaced-apart projections, the magnetic field is divided into discrete localized regions. Each projection engages only the top sheet at its contact point, preventing continuous magnetic flux paths that would engage multiple sheets. This segmentation enables the top sheet to be held and separated from lower sheets during de-stacking operations.
Solution Approach 2:
The harmful deep penetration of magnetic field into lower sheets is eliminated by extracting or removing the continuous magnetic path. The spaced-apart projections create air gaps between projections where magnetic flux cannot penetrate, effectively taking out the unwanted deep field penetration and confining magnetic engagement to only the top sheet at projection tips.
3Ease of operation
If spaced-apart projections are used to create shallow magnetic field, then de-stacking capability improves, but the device complexity increases
Solution Approach 1:
The pole shoe is segmented into multiple simple projection elements spaced apart from each other. While this creates a more complex overall structure compared to a continuous surface, each individual projection remains a simple geometric form. The segmentation enables the shallow magnetic field configuration necessary for de-stacking capability.
Solution Approach 2:
The pole shoe structure transitions from a two-dimensional continuous surface to a three-dimensional array of spaced-apart projections with specific height, spacing, and distribution patterns. This dimensional change creates the shallow magnetic field geometry needed for de-stacking while the regular spacing and uniform projection design help manage the complexity through predictable geometric repetition.
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 the top sheet while minimizing the magnetic field's impact on lower sheets, enabling better de-stacking capabilities and material handling efficiency.
Implementation Method 1
at least one first permanent magnet supported by the housing and having an active N-S pole pair; at least one second permanent magnet supported by the housing and having an active N-S pole pair
Implementation Method 2
magnetic device for magnetically coupling to a ferromagnetic body
Implementation Method 3
The switchable magnet device may be attached in a removable manner, via switching the magnet device between an 'on' state and an 'off' state
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.