Switch Magnetic Yoke Arc Drive Force
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Solution Overview
Problem
The existing switches face challenges in effectively exerting a drive force on arcs, which affects their arc-extinguishing performance.
Innovation Solution
The switch design includes a first and second fixed contact, a movable contact, a drive shaft, and yokes made of magnetic substances, with a permanent magnet creating a magnetic field component to effectively drive the arc between the contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnetic lines of force guiding members are arranged symmetrically along the outer wall of the arc-extinguishing chamber case, then the drive force on the arc is enhanced, but the device complexity increases
Solution Approach 1:
The magnetic system is segmented into multiple yokes (first outside yoke, second outside yoke, first inside yoke, second inside yoke) arranged symmetrically, with each yoke contributing to the magnetic field distribution. This segmentation allows the drive force to be enhanced through coordinated magnetic field components while maintaining structural modularity.
Solution Approach 2:
Multiple yokes are combined to form an integrated magnetic circuit system that works together to generate the required magnetic field. The permanent magnet is integrated with the yoke structure, merging the magnetic source with the guiding elements to achieve efficient arc control without excessive complexity.
2Reliability
If multiple yokes are used to generate magnetic field components, then arc-extinguishing performance is improved, but the manufacturing cost increases
Solution Approach 1:
Each yoke serves multiple functions: guiding magnetic field lines, providing structural support, and contributing to the symmetric magnetic field distribution. The permanent magnet also serves dual purposes by generating the magnetic field and being integrated into the yoke structure, reducing the need for separate components.
Solution Approach 2:
The magnetic system uses composite construction combining permanent magnet material with yoke materials, allowing optimization of magnetic properties while controlling manufacturing costs through material selection and structural design.
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 arc-extinguishing performance by effectively exerting a drive force on the arc, ensuring efficient interruption and extended arc length, regardless of current direction.
Implementation Method 1
The permanent magnet magnetically couples the first outside yoke, the second outside yoke, the first inside yoke, and the second inside yoke, and produces a magnetic field component in the direction aligned, between the first fixed contact point and the first movable contact point and between the second fixed contact point and the second movable contact point
Implementation Method 2
A magnetic field component in a direction vertical to the extending direction of the movable contact is produced between the fixed contact point and the movable contact point by the permanent magnet and the magnetic plate. An arc produced between the fixed contact point and the movable contact point is extended outward in the extending direction of the movable contact by this magnetic field component and extinguished
Data Source
AI summary
A switch includes a first fixed contact, a second fixed contact, a movable contact, a drive shaft, a first outside yoke, a second outside yoke, a first inside yoke, a second inside yoke, and a permanent magnet. The permanent magnet magnetically couples the first outside yoke, the second outside yoke, the first inside yoke, and the second inside yoke, and produces a magnetic field component in a direction in which the first fixed contact point and the second fixed contact point are aligned, between the first fixed contact point and the first movable contact point and between the second fixed contact point and the second movable contact point.