Segmented Pole Shoes for Thin-Sheet Magnetic 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 use of pole shoes with spaced-apart projections and recesses creates a shallow magnetic field that confines 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 continuous pole shoe surface, then the magnetic field penetrates into multiple sheets, but the holding force becomes insufficient and multiple sheets are lifted simultaneously
Solution Approach 1:
The pole shoe surface is segmented into spaced-apart projections rather than being continuous. This segmentation creates discrete magnetic field concentration points at each projection tip, preventing magnetic field penetration into multiple sheets and enabling selective lifting of individual thin ferromagnetic materials during de-stacking operations
2Reliability
If the magnetic field is strong enough to hold thin materials, then multiple sheets may be penetrated and lifted simultaneously, reducing operational efficiency
Solution Approach 1:
The magnetic field strength is made non-uniform across the pole shoe surface by using spaced-apart projections. Each projection tip creates a localized region of high magnetic field strength sufficient for reliable holding, while the recessed areas between projections have reduced field strength that prevents penetration into multiple sheets, thus maintaining both reliability and productivity
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 lifted simultaneously, 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
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.