Radial Permanent Electromagnetic Holder for Thin High-Force Conveyance
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Solution Overview
Problem
Conventional permanent electromagnetic holders and devices increase in size due to the arrangement of magnets and coils in the height direction, compromising their thickness and power consumption.
Innovation Solution
A permanent electromagnetic holder design featuring a first magnet with a small coercive force, a second magnet with a large coercive force in a ring shape, and a coil positioned between them, with magnetic poles oriented orthogonal to the attracting surface, allowing for a thin structure with high attraction force and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the permanent magnet and electromagnet are arranged side by side in the height direction, then the attraction force is improved, but the device size in the height direction increases
Solution Approach 1:
The patent transitions from a vertical stacking arrangement (height direction) to a radial arrangement where magnets and coils are positioned concentrically around a central axis. The first permanent magnet, second permanent magnet, and coil are arranged radially with their magnetic poles oriented orthogonally to the attracting surface, achieving high attraction force while reducing height dimension.
Solution Approach 2:
The patent employs a nested configuration where the coil is positioned between the first permanent magnet and the second permanent magnet, all concentric around a central axis. This nested arrangement allows multiple magnetic components to occupy overlapping radial spaces, maximizing magnetic field utilization while minimizing the overall height of the device.
2Force
If multiple magnets are arranged side by side in the height direction, then the attraction force is improved, but the power consumption increases due to continuous energization requirements
Solution Approach 1:
The patent utilizes the periodic switching of the coil's magnetizing direction to control the attraction state. By alternating the magnetization direction of the first permanent magnet through periodic coil energization, the system achieves attraction and release cycles without requiring continuous power, thereby reducing overall power consumption while maintaining high attraction force when needed.
3Device complexity
If the permanent magnet and electromagnet are arranged side by side in the height direction, then the device structure is simplified, but the device complexity in terms of spatial arrangement increases
Solution Approach 1:
The patent employs asymmetric magnetic pole orientations where the first permanent magnet and second permanent magnet have their magnetic poles arranged orthogonally to the attracting surface rather than parallel to it. This asymmetric configuration, combined with the radial arrangement, creates a compact structure that reduces height while maintaining structural integrity and magnetic effectiveness.
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 achieves a thin structure with high attraction force and low power consumption by efficiently switching the magnetizing direction of the first magnet through coil energization, maintaining the attraction state without continuous energization.
Implementation Method 1
a coil configured to magnetize the first magnet through energization of the coil
Implementation Method 2
a first magnet that is a magnet having a relatively small coercive force; a second magnet that is a rare-earth magnet having a relatively large coercive force
Data Source
AI summary
A permanent electromagnetic holder is provided with: a first magnet; a second magnet; and a coil, the first magnet being configured such that magnetic pole surfaces of different magnetic poles are oriented in a thrust direction of an axial center orthogonal to the attracting surface, the second magnet being configured such that magnetic pole surfaces of different magnetic poles are oriented in the thrust direction of the axial center and being disposed outside the first magnet, the coil being disposed between the first magnet and the second magnet, the first magnet, the second magnet, and the coil being arranged so as to overlap in the radial direction of the axial center, and an operation of switching an attraction ON/OFF state being carried out by switching a magnetizing direction of the first magnet through instantaneous energization of the coil when the attraction ON/OFF state is switched.