Permanent Electromagnetic Holder With Radial Magnet Layout
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Solution Overview
Problem
Conventional permanent electromagnetic holders and attraction devices face challenges in reducing size while maintaining high attraction force and low power consumption, primarily due to the arrangement of magnets and coils in the height direction.
Innovation Solution
The design incorporates a first magnet with a small coercive force and a rare-earth second magnet in a ring shape, along with a coil that magnetizes the first magnet, arranged to overlap in the radial direction. This configuration allows for switching between attraction ON and OFF states by altering the magnetizing direction of the first magnet through coil energization.
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 size in the height direction increases
Solution Approach 1:
The patent transitions from a vertical arrangement (height direction) to a radial arrangement. The first magnet and second magnet are positioned concentrically with the coil, where the first magnet is at the center and the second magnet surrounds it radially. This dimensional change allows the magnetic components to be compact in the height direction while maintaining effective attraction force through radial magnetic field configuration.
Solution Approach 2:
The patent employs a nested configuration where the first magnet is placed at the center and the second magnet is arranged around it in a radial direction, with the coil positioned between them. This nested arrangement allows multiple magnetic components to occupy overlapping radial spaces, reducing the overall height while maintaining the magnetic circuit functionality.
2Use of energy by stationary object
If the first permanent magnet and second permanent magnet are arranged side by side in the height direction, then the attraction force is improved and power consumption is reduced, but the size in the height direction increases
Solution Approach 1:
The patent reconfigures the magnetic components from a vertical stack to a radial arrangement. The first magnet (electromagnet) and second magnet (permanent magnet) are positioned concentrically, with the coil wound around the first magnet. This radial configuration reduces height while enabling the permanent magnet to provide continuous magnetic flux, reducing the need for continuous coil energization and thus lowering power consumption.
Solution Approach 2:
The patent combines the electromagnet (first magnet with coil) and permanent magnet (second magnet) into a single integrated magnetic assembly. The permanent magnet provides a baseline magnetic field that reduces the energy required by the coil to achieve attraction, while the coil provides controllable magnetization. This merged configuration achieves both high attraction force and low power consumption in a compact height.
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 design achieves a thin structure with a high attraction force and reduced power consumption, while preventing unintended attraction or operation when the power is off.
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.