Switching Device Lateral Magnet Arc Extinction Assembly
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Solution Overview
Problem
Conventional switching devices for high current and high voltage require complex assembly and have low accuracy, leading to variations in operation characteristics due to the placement of arc-extinguishing permanent magnets between contact points and an iron core.
Innovation Solution
A switching device design where pairs of movable and fixed contact points are connected in series with permanent magnets placed on the lateral sides to form a magnetic field that extends and extinguishes arcs, facilitating easy retrofitting and assembly, reducing component count, and ensuring uniform magnetic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc-extinguishing permanent magnets are disposed between contact points and fixed iron core, then arc extinction capability is improved, but assembling work time increases and assembling accuracy decreases
Solution Approach 1:
The permanent magnets are moved from a vertical arrangement (between contact points and iron core) to a lateral arrangement (on side surfaces of contact points). This dimensional change allows the magnets to be positioned outside the main assembly path, enabling parallel assembly operations and eliminating the need for precise vertical positioning between multiple components.
Solution Approach 2:
The switching device is divided into separate functional modules: contact point assemblies with integrated lateral magnets can be prepared independently, then assembled into the final device. This segmentation allows pre-assembly and quality control of magnet positioning before final integration, reducing overall assembly time and improving accuracy.
2Reliability
If arc-extinguishing permanent magnets are disposed between contact points and fixed iron core, then arc extinction capability is improved, but variation in operation characteristics increases
Solution Approach 1:
By positioning magnets laterally on the side surfaces of contact points rather than vertically between components, the design eliminates cumulative positioning errors that would occur in a vertical stack. The lateral position can be precisely controlled through simple mounting features on the contact point structure itself, ensuring consistent magnetic field generation and uniform operation characteristics across all units.
3Loss of time
If permanent magnets are disposed on lateral side of contact points, then assembling work time is reduced and assembling accuracy is improved, but magnetic field strength may be insufficient
Solution Approach 1:
The magnetic circuit is designed with asymmetric flux paths that leverage the lateral magnet position. Magnetic flux is directed through optimized pathways that concentrate field lines where needed for arc extinction, compensating for the lateral rather than direct positioning. This asymmetric design allows strong magnetic fields to be generated from lateral magnet placement, maintaining arc extinction effectiveness while preserving assembly simplicity.
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 results in a switching device with simplified assembly, high accuracy, reduced operational variations, and extended contact point lifetime, while maintaining high productivity and quiet operation.
Implementation Method 1
at least one permanent magnet is disposed on a lateral side of the contact points so that a magnetic field, which extends an arc generated between the contact points in either an upward or downward direction, is formed
Implementation Method 2
it is possible to uniformly exert a magnetic force on both sides of the adjacent contact points with one permanent magnet. Therefore, a switching device having a small number of components, high productivity and no variation in operation characteristics is obtained
Data Source
AI summary
A plurality of pairs of a movable contact point and a fixed contact point, which are opposite so that they can be contacted with and separated from each other, are provided in parallel and connected in series so that an electrical current flows in the same direction between the movable contact point and the fixed contact point, which are simultaneously closed. Permanent magnets are disposed on lateral sides of the movable contact point and the fixed contact point a so that a magnetic field, which extends an arc generated between the contact points in either an upward or downward direction, is formed.