Magnet Pair Switch Layout for Arc Extinguishing Space
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Solution Overview
Problem
Increasing magnetic flux densities near contact points to enhance arc extinguishing performance leads to a failure in forming necessary arc extinguishing spaces due to the need for closer permanent magnets.
Innovation Solution
A switch design with first and second stationary contacts and movable contacts, featuring magnet pairs with surfaces of the same poles facing each other, disposed in a manner that increases magnetic flux concentration near contact points while forming arc extinguishing spaces by positioning magnets obliquely to create arc extinguishing spaces outside the contact points, allowing arcs to be drawn into these spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent magnets are placed closer to contact points to increase magnetic flux density, then arc extinguishing performance is improved, but arc extinguishing spaces cannot be formed
Solution Approach 1:
The patent transitions from a single-dimension linear arrangement to a two-dimensional oblique arrangement. Magnets are positioned at oblique angles relative to the contact points, creating magnetic flux concentration in multiple spatial dimensions. This dimensional change allows magnetic flux to be concentrated near contact points while simultaneously providing lateral space for arc extinguishing zones.
Solution Approach 2:
The patent employs asymmetric positioning of magnets relative to contact points. Instead of symmetric placement, magnets are positioned obliquely at specific angles, creating asymmetric magnetic field distributions that concentrate flux where needed while leaving space for arc extinction. The oblique arrangement creates unequal spacing and angular relationships that optimize both flux density and space utilization.
2Area of stationary object
If permanent magnets are placed farther from contact points to form arc extinguishing spaces, then arc extinguishing spaces are formed, but driving force for extending arcs is reduced
Solution Approach 1:
By introducing oblique angular positioning, the system achieves force transmission in multiple dimensions. The oblique magnets create magnetic flux components that act both longitudinally (providing driving force) and laterally (creating extinguishing spaces), effectively utilizing three-dimensional space to resolve the force-space tradeoff.
Solution Approach 2:
The patent changes the positional parameters of magnets from linear distances to oblique angles and coordinates. By adjusting the oblique angle and position parameters, the system optimizes the balance between magnetic flux density (affecting driving force) and spatial distribution (affecting extinguishing space), achieving both objectives simultaneously.
3Reliability
If magnetic flux density is increased near contact points, then arc extinguishing performance is improved, but magnets must be positioned closer causing space constraints
Solution Approach 1:
The oblique positioning approach adds angular dimension to magnet placement, transforming a constrained one-dimensional positioning problem into a two-dimensional solution space. This allows magnets to be positioned at optimal angles that simultaneously satisfy flux density requirements and spatial constraints, reducing overall device complexity.
Solution Approach 2:
The patent introduces angular parameters and oblique coordinates as additional degrees of freedom in magnet positioning. By changing from simple linear distance parameters to composite angular and positional parameters, the system gains flexibility in meeting performance specifications without increasing physical footprint or structural complexity.
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 configuration enhances the driving force on arcs and improves arc extinguishing performance by concentrating magnetic flux near contact points and creating effective arc extinguishing spaces, preventing magnetic field interference and enhancing arc interruption.
Implementation Method 1
Arc may occur upon the break of the circuit with the movable contact points away from the stationary contact points. Near the contact points at which such arcs occur are provided permanent magnets that generate magnetic fields to drive the arcs under Lorentz force, such that the arcs are extended
Implementation Method 2
In the case of increasing the magnetic flux densities near the contact points so as to increase the driving force for extending the arcs
Data Source
AI summary
A switch includes: a first stationary contact having a first stationary contact point; a second stationary contact having a second stationary contact point; a movable contact having a first movable contact, and a second movable contact point; a first magnet pair defined by magnets having surfaces facing each other, the magnets of the first magnet pair being disposed with the first stationary contact point and the first movable contact point therebetween in such a manner that the magnets of the first magnet pair become farther from each other outwardly; and a second magnet pair defined by magnets having surfaces facing each other, the magnets of the second magnet pair being disposed with the second stationary contact point and the second movable contact point therebetween in such a manner that the magnets of the second magnet pair become farther from each other outwardly.