Integrated Yoke for Release Electromagnet
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Solution Overview
Problem
Conventional release type electromagnetic devices for circuit breakers have complex structures with numerous components, making assembly difficult and unstable, with issues in controlling magnetic resistance at joint portions and unreliable positioning of permanent magnets and transfer yokes.
Innovation Solution
A simplified design with a yoke configuration using a plunger pass-through side yoke body and central side yoke bodies bent to form a yoke closing portion, reducing the number of components and simplifying assembly by eliminating complex shapes and joint portions, and stabilizing magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yoke is composed of multiple separate parts (main yoke and end part yoke) joined by caulking, then the device can be assembled, but the magnetic resistance at joint portions cannot be controlled and release characteristics become unstable
Solution Approach 1:
The patent merges the main yoke and end part yoke into a single integrated yoke structure. The yoke is formed as one piece with a through hole that extends through the entire length, eliminating the need for separate components and joint portions. This integration removes the magnetic resistance issues at joint interfaces while maintaining the necessary structural functionality for holding and releasing the plunger.
Solution Approach 2:
While the yoke itself is integrated, the patent segments the through hole into functional zones: an enlarged portion at one end for plunger insertion and a standard portion extending through for magnetic flux passage. This segmentation within the integrated structure provides functional differentiation without requiring separate physical components.
2Reliability
If the plunger has a three-stage diameter structure with multiple insertion portions, then the plunger can be retained by the yoke, but the plunger shape becomes complicated and assembly is difficult
Solution Approach 1:
The patent combines the retention functionality that previously required multiple diameter stages into a single simplified plunger shape. The plunger has a uniform diameter and is retained by the enlarged portion of the through hole in the yoke, which acts as a retention chamber. This merging of functions simplifies the plunger geometry while maintaining reliable retention through the magnetic attraction and physical confinement.
3Reliability
If the first insertion pipe is bent and engaged with the bobbin, then the pipe is secured, but the number of components increases and assembly work becomes troublesome and time-consuming
Solution Approach 1:
The patent integrates the insertion pipe as a straight component that passes through the yoke's through hole without bending or engagement features. The pipe is simply inserted through the aligned holes in the yoke and bobbin, eliminating the need for bent sections and engagement mechanisms. This integration into a simple linear assembly process significantly reduces assembly steps and time while maintaining proper positioning through the aligned through-hole structure.
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 solution achieves stable release characteristics and simplifies assembly by reducing the number of components and improving magnetic flux control, leading to more reliable and efficient operation.
Implementation Method 1
The plunger is suctioned and retained to the yoke by the permanent magnet
Implementation Method 2
the permanent magnet is arranged on the transfer yoke... the plunger is suctioned and retained to the yoke by the permanent magnet
Implementation Method 3
when current is supplied to the electromagnetic coil in polarities that weaken the magnetic force of the permanent magnet
Data Source
Figure 1
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Figure 3
AI summary
In a release type electromagnetic device according to the present invention, a yoke in which a bobbin, an electromagnetic coil, a transfer yoke, and a permanent magnet are contained in an inner space is configured by arranging a plunger pass-through side yoke body which is located on the first bobbin frame body side of the bobbin and has a through hole communicated with a through hole of the bobbin, by arranging central side yoke bodies each of which is bent from the plunger pass-through side yoke body to the permanent magnet side, and by arranging permanent magnet side yoke bodies each of which is bent from each of the central side yoke bodies to the center side of the through hole of the bobbin to come into contact with the permanent magnet and to form a yoke closing portion at both end surfaces.