DC Relay Arc Path Formation Using Segmented Magnet Fields
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Solution Overview
Problem
Existing DC relays face issues with arc discharge paths being direction-dependent, leading to potential damage of internal components and reduced lifespan due to arcs moving towards the center region, necessitating careful consideration of current direction for operation.
Innovation Solution
An arc path formation unit with strategically arranged magnets that generate electromagnetic forces to direct arcs away from the center region, allowing arcs to be extinguished externally, independent of current direction, using a structure that maintains the existing relay design without excessive modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are provided to form arc discharge paths, then arcs can be discharged through preset paths, but arcs may move toward the center region and damage internal components when current flows in certain directions
Solution Approach 1:
The magnetic field formation is segmented into multiple independent magnet units (first magnet, second magnet, third magnet) positioned at different locations. Each magnet creates a localized magnetic field that contributes to the overall arc discharge path control, allowing independent optimization of field distribution to direct arcs away from center components.
Solution Approach 2:
Different regions of the relay have different magnetic field characteristics created by strategically positioned magnets. The magnetic field strength and direction are locally optimized at each magnet position to ensure arcs are consistently directed toward safe discharge paths regardless of current direction, preventing damage to center region components.
2Reliability
If electromagnetic force direction depends on current flow direction, then arcs can be controlled to follow preset paths, but current direction must be carefully considered by users, reducing ease of operation
Solution Approach 1:
The magnetic field formation system is designed to handle multiple current flow directions universally. The arrangement of multiple magnets with different polarities creates a magnetic field configuration that effectively guides arcs along safe paths regardless of whether current flows in the first or second direction, making the relay universally applicable without user concern for current direction.
Solution Approach 2:
Instead of relying on current direction to determine arc path, the invention inverts the approach by using fixed magnet arrangements to actively control arc direction. The magnets are positioned and polarized to create electromagnetic forces that override the natural arc tendency, ensuring arcs are directed away from harmful regions regardless of current flow direction.
3Object-affected harmful factors
If magnets are arranged to direct arcs away from center region, then component safety is improved, but magnetic field distribution becomes complex, increasing device complexity
Solution Approach 1:
The complex magnetic field control is achieved through segmentation into multiple discrete magnet units positioned at specific locations (first magnet at first position, second magnet at second position, third magnet at third position). This segmentation allows the complex overall function to be realized through simpler, independent magnet elements that can be individually positioned and polarized.
Solution Approach 2:
The magnets serve as intermediary elements between the electrical contacts and the arc discharge path. By introducing these magnetic field-generating intermediaries, the system achieves precise control over arc trajectories without requiring direct mechanical intervention or complex contact structures, simplifying the overall device while achieving the desired protection.
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 effectively directs arcs away from critical components, preventing damage, ensuring reliable operation and extended lifespan by allowing arcs to be extinguished along a controlled path, enhancing user convenience and safety.
Implementation Method 1
The magnets produce magnetic fields in a space where the fixed contact and the movable contact are in contact with each other
Implementation Method 2
The arc discharge path may be formed by the formed magnetic fields and electromagnetic force generated by a flow of current
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
Disclosed are an arc path formation unit and a direct current relay including same. An arc path formation unit according to an embodiment of the present invention comprises a plurality of magnet parts. One of the plurality of magnet parts is disposed on one surface of a magnet frame. The remaining magnet parts among the plurality of magnet parts are disposed on the other respective surfaces of the magnet frame. The magnet part disposed on the one surface is formed longer than the other magnet parts. Also, the magnet parts disposed on the other surface are spaced apart from each other as far as possible. Accordingly, the magnetic field formed between the magnet parts is formed such that the electromagnetic force generated in each of stationary contacts is generated in a direction away from the central region. As a result, damage to components disposed in the central region can be prevented.