DC Relay Arc Path Formation Using Asymmetric Magnet Arrangement
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Solution Overview
Problem
Existing DC relays face challenges in controlling the direction of arc discharge paths, leading to potential damage to internal components and user inconvenience due to the dependence on current flow direction, which can result in reduced lifespan and safety hazards.
Innovation Solution
An arc path formation unit with a magnet frame and strategically arranged magnets that generate a magnetic field to direct the arc discharge path away from the center region, independent of current flow direction, and enhance the arc extinguishing capability without requiring excessive structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent magnets are provided in the space where fixed contacts and movable contact are in contact, then arc discharge path can be formed, but arc may move toward the center region and damage various members provided at the position
Solution Approach 1:
The patent applies asymmetry by providing a greater number of permanent magnets on one surface of the magnet frame than on the opposite surface. Specifically, multiple magnets are arranged on the first surface while fewer or no magnets are arranged on the second surface, creating an asymmetric magnetic field distribution that directs the arc discharge path away from the center region toward the side with more magnets, thereby preventing damage to center members.
Solution Approach 2:
The magnet frame acts as an intermediary structure that mediates the arc discharge path. By strategically positioning permanent magnets on specific surfaces of the magnet frame, the magnetic field is shaped to guide the arc along a predetermined path that avoids the center region, thus protecting shafts, spring members, and other critical components located in the center.
2Reliability
If electromagnetic force direction depends on current flow direction, then arc discharge path can be controlled, but user must consider current direction which causes inconvenience
Solution Approach 1:
The asymmetric magnet arrangement provides universal arc discharge path control that works regardless of current flow direction. The magnetic field configuration ensures that the electromagnetic force always directs the arc toward the same safe region (the side with more magnets), making the relay functionally independent of current direction and eliminating the need for users to consider current polarity.
3Object-affected harmful factors
If magnets are arranged to direct arc away from center, then member damage is prevented, but magnetic field strength may be insufficient for effective arc extinguishing
Solution Approach 1:
The patent applies local quality by concentrating multiple permanent magnets on the first surface of the magnet frame, creating a localized region of strong magnetic field. This concentrated arrangement ensures sufficient magnetic field strength and electromagnetic force in the critical area where arc control is needed, while maintaining the asymmetric distribution that directs arc away from the center region.
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 the arc discharge path away from critical components, preventing damage and improving user convenience by ensuring the arc is extinguished efficiently, regardless of current flow direction, thus enhancing the reliability and safety of the DC relay.
Implementation Method 1
The magnets may produce magnetic fields in the inner space
Implementation Method 2
The arc discharge path may be formed by the formed magnetic fields and electromagnetic force generated by a flow of current
Implementation Method 3
electromagnetic force is formed outward as indicated with a hatched arrow. Accordingly, a generated arc can be discharged to outside along the direction of the electromagnetic force
Data Source
AI summary
Shown are an arc path formation unit and a direct current relay including same. The arc path formation unit according to an embodiment of the present disclosure includes a plurality of magnet parts. The magnet parts form a magnetic field at the point at which each fixed contact is positioned. Each magnet part positioned adjacent to each fixed contact is formed so that opposite surfaces thereof facing each other have different polarities. An electric current flowing through the fixed contact and a movable contact, and the magnetic field generated by each magnet part form an electromagnetic force. The electromagnetic force moves away from the center of the direct current relay. Therefore, the generated arc moves in the direction of the electromagnetic force so as to move away from the center of the direct current relay. Thus, damage to the direct current relay can be prevented.