Segmented Magnetic Chuck for High-Force Thin Plate Holding
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Solution Overview
Problem
Conventional magnetic chucks face challenges in generating sufficient magnetic attraction force for heavy workpieces, especially thin plates, due to magnetic saturation, and often require larger permanent magnets, which increase device size.
Innovation Solution
A magnetic chuck design featuring a tubular permanent magnet with a core yoke on its inner periphery, combined with additional yokes to concentrate magnetic flux and enhance attraction force, while minimizing air pressure requirements for piston movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of the permanent magnet is increased to generate sufficient magnetic attraction force, then the magnetic attraction force is improved, but the device size increases
Solution Approach 1:
The permanent magnet is divided into multiple segments arranged in an alternating polarity pattern around the cylindrical core yoke. This segmentation allows magnetic flux to be concentrated through the core yoke and delivered to the workpiece surface more efficiently, increasing attraction force without requiring a larger overall magnet volume.
Solution Approach 2:
The core yoke is designed with specific local properties (ferromagnetic material with high permeability) to concentrate and guide magnetic flux precisely where needed at the workpiece interface. This local optimization of magnetic properties enhances the magnetic attraction force at critical locations without increasing the total magnet size.
2Force
If a single large permanent magnet is used to increase magnetic flux, then the magnetic attraction force is improved, but the magnetic saturation in thin plate workpieces occurs
Solution Approach 1:
The alternating polarity segmentation of the permanent magnet creates multiple localized magnetic flux paths through the workpiece rather than one large saturated path. This distributes the magnetic flux density, preventing magnetic saturation in thin plate workpieces while maintaining high total attraction force.
Solution Approach 2:
The core yoke is designed with specific local properties (ferromagnetic material with high permeability) to concentrate and guide magnetic flux precisely where needed at the workpiece interface. This local optimization of magnetic properties enhances the magnetic attraction force at critical locations without increasing the total magnet size.
3Force
If the magnetic attraction force is increased to hold heavy workpieces, then the holding capability is improved, but the air pressure required to move the piston assembly increases
Solution Approach 1:
The harmful magnetic attraction force between the piston assembly and the bottom yoke is extracted and minimized by designing the bottom yoke to face the core yoke at the movement end, creating a magnetic circuit that reduces unwanted attraction. This allows the piston to move with lower air pressure while the workpiece holding force remains high due to the segmented magnet design.
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
The design significantly increases the magnetic attraction force on workpieces, allowing for effective holding of heavy workpieces with reduced air pressure needs, ensuring safety by minimizing unintended attraction of neighboring iron materials.
Implementation Method 1
the core yoke as a ferromagnetic body is disposed on the side of the inner periphery of the permanent magnet, so that the magnetic flux from the permanent magnet can be concentrated to increase the magnetic attraction force acting on the workpiece
Implementation Method 2
a magnetic chuck that attracts and holds a workpiece by means of a force of a permanent magnet
Implementation Method 3
as the piston is displaced by a fluid pressure, the permanent magnet comes close to the workpiece and attracts and holds the workpiece
Data Source
AI summary
A magnetic chuck has a piston assembly that contains a cylindrical permanent magnet and a core yoke. The piston assembly is movable inside a cylinder tube. The permanent magnet is provided on the outer periphery of the core yoke and is magnetized in the radial direction.