Electromagnetic Contactor Yoke Structure for Short-Circuit Hold Force
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Solution Overview
Problem
In electromagnetic contactors, the fixed yoke's displacement with the movable iron core reduces the closing force when the yokes attract each other, making it difficult to prevent contact unit separation during short-circuits.
Innovation Solution
The fixed yoke is integrated into a resin container's skeleton, where it is held securely, allowing the fixed and movable yokes to attract each other without reducing the closing force, thus preventing contact unit separation during short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fixed yoke is fixed to the holder that moves in an interlocked manner with the movable iron core, then the structure is simpler, but the closing force is reduced when the yokes attract each other
Solution Approach 1:
The fixed yoke is extracted from the moving holder structure and fixed directly to the stationary container body, separating it from the movement mechanism. This allows the fixed yoke to remain stationary while the movable yoke moves, preventing the reduction of closing force that occurs when both yokes move together.
2Volume of moving object
If the fixed yoke is fixed to the moving holder, then the assembly is more compact, but the contact unit separation cannot be effectively prevented during short-circuit
Solution Approach 1:
The fixed yoke is extracted from the moving holder assembly and anchored to the stationary container body. This extraction ensures that during short-circuit conditions, the fixed yoke remains stationary to provide stable magnetic attraction, effectively preventing contact unit separation while maintaining compact overall design.
3Adaptability or versatility
If the fixed yoke moves with the movable iron core, then the magnetic circuit is more flexible, but the closing direction force is reduced
Solution Approach 1:
The fixed yoke is extracted from the moving mechanism and firmly attached to the stationary container body. This creates a stable reference point for the magnetic circuit, ensuring that the full closing direction force is maintained when the movable yoke is attracted, while the magnetic circuit remains flexible through the movable yoke's ability to move.
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 effectively maintains the closing force generated by the electromagnet, preventing contact unit separation during short-circuits by securely holding the fixed yoke within the resin container's skeleton.
Implementation Method 1
The fixed yoke and the movable yoke attract each other caused by a magnetic circuit being formed about an axis in a conduction direction in which current flows in the movable contact piece when the contact unit is closed
Data Source
AI summary
To more effectively prevent separation of a contact unit at the time of short-circuit in an electromagnetic contactor. A capsule case is made of resin. A fixed yoke is arranged between a pair of fixed contact pieces, and at least a portion of the fixed yoke is held in a skeleton forming a capsule case. A movable yoke is disposed on a movable contact piece and is opposed to the fixed yoke. The fixed yoke and the movable yoke attract each other caused by a magnetic circuit being formed about an axis in a conduction direction in which current flows in the movable contact piece when a contact unit is closed.