Magnetic Holding Device with Segmented Pole Assemblies
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Solution Overview
Problem
Magnetic substance holding devices face challenges in minimizing residual magnetism when detaching a workpiece, which affects usability, and struggle to achieve strong holding forces in a compact space with existing technologies.
Innovation Solution
A magnetic substance holding device design featuring pole piece assemblies with permanent magnets and coils, allowing for controlled magnetic flux and easy switching between holding and detaching modes, while minimizing residual magnetism by configuring the magnetic circuits to prevent flux leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If more permanent magnets are used to increase holding force, then holding force is improved, but residual magnetism becomes larger and magnetic flux control becomes more difficult
Solution Approach 1:
The device divides the magnetic circuit into multiple independent pole piece assemblies, each with its own permanent magnets and coils. This segmentation allows individual control of magnetic flux in each assembly, enabling precise control of total magnetic flux while maintaining strong holding force through coordinated operation of multiple segments.
Solution Approach 2:
The invention changes the magnetic flux parameters by using coils to dynamically adjust the magnetic flux generated by permanent magnets. By controlling the current in coils, the magnetic flux density and distribution can be modified, allowing the system to achieve strong holding force when needed while minimizing residual magnetism during detachment.
2Force
If more permanent magnets are used to increase holding force, then holding force is improved, but magnetic flux control becomes more difficult
Solution Approach 1:
The magnetic circuit is segmented into multiple pole piece assemblies with independent coils, allowing decentralized control of magnetic flux. Each assembly can be controlled independently, simplifying the overall control strategy compared to managing a single large magnetic system.
Solution Approach 2:
The pole piece assemblies are designed to perform multiple functions: generating strong magnetic flux for holding, controlling flux distribution, and minimizing residual magnetism. The coils serve dual purposes of both generating magnetic flux and controlling the overall magnetic field configuration.
3Volume of moving object
If a compact design is used to reduce space, then device size is improved, but magnetic flux control and residual magnetism minimization become more challenging
Solution Approach 1:
The device employs a nested structure where coils are wound around pole pieces, and permanent magnets are positioned within the magnetic circuit formed by these components. This nesting allows multiple functional elements to occupy overlapping spatial volumes, achieving compact design while maintaining effective magnetic flux control through the layered configuration.
Solution Approach 2:
The invention utilizes three-dimensional magnetic flux paths and spatial arrangement of pole pieces in multiple dimensions. By organizing pole pieces and permanent magnets in a compact 3D configuration with optimized magnetic flux paths, the device achieves strong holding force and effective flux control within a reduced volume.
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 device achieves strong holding forces with minimal residual magnetism, allowing for efficient attachment and detachment of workpieces in a compact design, ensuring effective magnetic force control with small electric current usage.
Implementation Method 1
it attaches a magnetic workpiece to a holding face using strong magnetic force from a permanent magnet
Implementation Method 2
employing an additional electromagnet to control the magnet flux
Data Source
AI summary
A magnetic substance holding device includes: a first pole piece assembly comprising at least one first pole piece, at least two second pole pieces, and at least two first permanent magnets; a second pole piece assembly comprising at least one third pole piece, at least two fourth pole pieces, and at least two second permanent magnets; a coil; and a control device. The first pole piece assembly and/or the second pole piece assembly is configured to be movable such that they are switched between a first arrangement in which the second faces of the first pole piece assembly are spaced apart from the first faces of the second pole piece assembly, and a second arrangement in which the second faces of the first pole piece assembly come in contact with the first faces of the second pole piece assembly. The control device controls holding and detaching of a workpiece on and from the first faces of the first pole piece assembly or the second faces of the second pole piece assembly, by way of controlling electric current applied to the coil to switch between the first arrangement and the second arrangement.