Permanent Magnet Assembly Using Electrically Detachable Adhesive
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Solution Overview
Problem
The existing methods for producing large permanent magnet magnetic circuits face challenges in stably attaching magnets to a yoke, particularly with the assembly-after-magnetization method, which requires rigid jigs due to attraction and repulsive forces, and involve high costs and labor for customizing assembly jigs with each size or shape change.
Innovation Solution
A method using an electrically detachable adhesive to fix permanent magnets or magnet units to a general-purpose assembly jig, allowing for easy detachment by applying voltage, enabling stable attachment and reuse of jigs without modifying the jig structure, even when the magnet size or shape changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the assembly-after-magnetization method is used to attach magnetized magnets to a yoke, then the magnetic circuit can be assembled with magnets having desired magnetization directions, but attraction forces and repulsive forces are generated between magnets and the yoke or between magnets, making it difficult to stably assemble the magnets
Solution Approach 1:
A non-magnetic holding plate is introduced as an intermediary component between the magnet and the assembly jig. This holding plate provides a stable mechanical interface for fixing the magnet during assembly, mediating the interaction and eliminating the instability caused by magnetic attraction and repulsion forces between the magnet and the yoke or other magnets.
2Stability of the object's composition
If a solid, highly rigid assembly jig is used to attach magnets to the yoke, then the magnets can be stably assembled despite attraction and repulsive forces, but the device complexity and fabrication cost increase
Solution Approach 1:
The assembly jig is segmented into a main body and a separate non-magnetic holding plate. This segmentation allows the holding plate to be specifically designed for stable magnet fixation, while the main body maintains simplicity. The holding plate can be easily replaced or adjusted without modifying the entire assembly jig structure.
Solution Approach 2:
The non-magnetic holding plate is designed as a simple, easily replaceable component that can be fabricated at low cost. Instead of investing in a complex, highly rigid assembly jig, the solution uses simple holding plates that can be discarded or replaced easily, reducing overall device complexity and fabrication costs.
3Manufacturing precision
If custom assembly jigs are fabricated for each magnet size or shape change, then the magnets can be properly assembled, but the design and fabrication costs increase
Solution Approach 1:
The non-magnetic holding plate is designed with universal features that allow it to accommodate different magnet sizes and shapes. By adjusting the positioning structures or selecting different holding plate configurations, the same basic assembly jig can be used for various magnet types, eliminating the need to fabricate custom jigs for each magnet size or shape change.
4Force
If magnets are fixed to the assembly jig using conventional methods, then the magnets can be held during assembly, but the assembly jig must be highly rigid and customized for each magnet configuration
Solution Approach 1:
The non-magnetic holding plate serves as a mediator between the magnet and the assembly jig, providing a dedicated interface for mechanical fixation. This intermediary component concentrates the fixation function, allowing the assembly jig itself to remain simple while the holding plate handles the force requirements for securing different magnet configurations.
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 method allows for stable and efficient assembly of permanent magnet magnetic circuits using a general-purpose assembly jig, reducing the need for custom jigs and minimizing design and fabrication costs, while ensuring easy detachment and reusability.
Implementation Method 1
a permanent magnet or magnet unit having a backplate is fixed to an assembly jig through an electrically detachable adhesive
Implementation Method 2
applying a voltage between the permanent magnet or magnet unit and the assembly jig to detach the electrically detachable adhesive from the permanent magnet or magnet unit or to detach the electrically detachable adhesive from the assembly jig
Data Source
AI summary
There is provided a method for producing a permanent magnet magnetic circuit that makes it possible to stably attach a permanent magnet to a yoke and to use a general-purpose assembly jig or to reuse an existing assembly jig even when the size or shape of a magnet to be attached is changed. More specifically, there is provided a method for producing the circuit comprising a magnet or magnet unit and a yoke, the method comprising the steps of: fixing the magnet or magnet unit to an assembly jig through an electrically detachable adhesive; fixing the magnet or magnet unit fixed to the jig, to the yoke; and applying a voltage between the magnet or magnet unit and the assembly jig to detach the adhesive from the magnet or magnet unit to detach the adhesive from the jig so as to detach the magnet from the jig.