Permanent Magnet Arc Blowing Device for Switching Reliability
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Solution Overview
Problem
Conventional switching devices are heavy, expensive, and require complex coil systems to reliably extinguish switching arcs, which depend on current direction and have high manufacturing costs.
Innovation Solution
A compact switching device using permanent magnets to generate a magnetic blowout field, with a specific configuration of magnetic field areas and channels to direct switching arcs consistently into arc quenching devices, eliminating the need for coils and ensuring reliable arc extinguishing regardless of current direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically operated blow-out coils are used to generate magnetic field, then switching arc can be blown out reliably, but the switching device becomes heavy, large, and expensive
Solution Approach 1:
The patent replaces electrically operated blow-out coils with permanent magnets to generate the magnetic field. This substitution eliminates the need for heavy electromagnetic coils while maintaining the arc-blowing function, directly resolving the contradiction between reliability and weight.
Solution Approach 2:
The invention extracts and eliminates the blow-out coils from the system, retaining only the essential permanent magnets for field generation. This removal of unnecessary components reduces weight and complexity while preserving the core arc extinguishing capability.
2Reliability
If blow-out coils are used to generate magnetic field, then arc can be blown out, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive electrically operated blow-out coils with simpler permanent magnets. This substitution significantly reduces manufacturing costs while maintaining reliable arc extinguishing performance.
Solution Approach 2:
The invention uses permanent magnets which are simpler and cheaper to manufacture compared to complex electromagnetic coil systems. This choice of component directly addresses the manufacturing cost issue.
3Adaptability or versatility
If magnetic field orientation varies with current direction, then arc can be blown out in both directions, but complex field configuration is required
Solution Approach 1:
The patent employs asymmetric magnetic field configuration with permanent magnets positioned to create field lines that naturally converge toward the contact point from both sides. This asymmetric arrangement achieves bidirectional arc blowing without requiring complex adjustable mechanisms.
Solution Approach 2:
The permanent magnet configuration serves multiple functions simultaneously: it generates the magnetic field for arc blowing, guides arcs from both current directions, and maintains consistent field orientation. This multi-functionality reduces overall system 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
The solution provides a cost-effective, compact, and reliable method for extinguishing switching arcs in both direct and alternating current operations, simplifying the construction and reducing manufacturing costs by using permanent magnets and optimizing magnetic field configurations.
Implementation Method 1
The arc-blowing device includes at least one blowing magnet for generating a magnetic blowing field
Implementation Method 2
The blowing field is designed such that any switching arc generated when the contact point opens is blown out of the contact point
Data Source
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AI summary
The present invention relates to a switching device with at least one contact point and an arc blowing device associated with the contact point, wherein the arc blowing device has at least one blowing magnet for generating a magnetic blowing field, and wherein the blowing field is designed such that a switching arc generated when the contact point is opened is blown out of the contact point.The blowing field has a first magnetic field region and a second magnetic field region arranged next to the first magnetic field region, wherein the magnetic field lines of the first magnetic field region are oriented opposite to the magnetic field lines of the second magnetic field region, and wherein the blowing field further has a transition region that connects the first magnetic field region and the second magnetic field region, wherein the orientation of the magnetic field lines in the transition region, starting from the first magnetic field region and the second magnetic field region respectively, aligns towards the contact point, so that the switching arc within the transition region is guided, depending on the current direction starting from the contact point, either into the first magnetic field region or into the second magnetic field region and is blown away from the contact point in the same direction in both cases.The arc blowing device comprises a first lateral pole plate, a second lateral pole plate, and a central pole plate arranged between them, wherein the first magnetic field region is located between the first lateral pole plate and the central pole plate, and wherein the second magnetic field region is located between the second lateral pole plate and the central pole plate, the central pole plate being shorter than the two lateral pole plates at least at one first end facing the contact point. According to the invention, the central pole plate is also shorter than the two lateral pole plates at a second end opposite its first end.