Electromagnetic Contactor Arc Cover Coupling for Short-Circuit Stability
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Solution Overview
Problem
Conventional electromagnetic contactors face issues with the arc box being easily separated from the frame due to weak fixing force of fastening members during short-circuit accidents.
Innovation Solution
The electromagnetic contactor design incorporates first, second, and third coupling parts protruding from the lower frame, upper frame, and arc cover, respectively, with corresponding fastening holes and auxiliary fastening holes, allowing for secure fastening using a single fastening member, enhancing the coupling force and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fastening members are used to fix the arc box to the frame, then the assembly process is simple, but the coupling force is weak and the arc box separates during short-circuit accidents
Solution Approach 1:
The invention transitions from a single-plane fastening approach to a three-dimensional coupling structure. The coupling part includes a coupling body with a coupling hole, and the fastening member extends through multiple components (coupling part, arc box, frame) in the vertical dimension, creating multi-dimensional mechanical interlocking that significantly strengthens the coupling force while maintaining structural clarity.
Solution Approach 2:
The fastening system combines multiple material and structural elements: the coupling part (with coupling hole), the arc box, the frame, and the fastening member work together as a composite fastening system. This composite structure distributes mechanical stress across multiple components and interfaces, enhancing overall coupling strength and reliability during fault conditions.
2Productivity
If multiple separate fastening operations are performed for arc box, upper frame, and lower frame, then each component can be secured independently, but the assembly process becomes time-consuming and complex
Solution Approach 1:
The invention merges multiple fastening operations into a single integrated fastening action. The fastening member simultaneously secures the coupling part, arc box, and frame through one insertion operation, eliminating the need for separate fastening steps. This combining of fastening functions significantly improves assembly efficiency while the modular coupling part design keeps the overall structure manageable and not overly complex.
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 design ensures stable coupling of the arc cover even under repeated arc extinguishing operations, preventing separation and improving assembly efficiency.
Implementation Method 1
When a specified voltage is applied to the coil, an excitation current flows, to generate magnetic flux in the fixed core
Implementation Method 2
which then turns into a magnet. Accordingly, the movable core is attracted toward the fixed core
Implementation Method 3
When the circuit is opened/closed, an arc is generated between the contact tips, and is extinguished by an arc box and a grid disposed in the arc box
Data Source
AI summary
The present disclosure relates to a frame of an electromagnetic contactor, and more specifically, to an electromagnetic contactor having excellent coupling force between an arc box and a frame. The electromagnetic contactor, comprises: a lower frame; an upper frame coupled to the upper portion of the lower frame; and an arc cover coupled to the upper portion of the upper frame, wherein a first coupling part is protrudingly formed on one surface of the lower frame, a second coupling part, connected to the first coupling part, is protrudingly formed on one surface of the upper frame, and a third coupling part, connected to the second coupling part, is protrudingly formed on one surface of the arc cover, wherein the fastening member is fastened by connecting the first coupling part, the second coupling part and the third coupling part.