Clapper Electromagnetic Tripping System for Reliable Low-Current Protection
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Solution Overview
Problem
Existing clapping type electromagnetic tripping systems in molded case circuit breakers, particularly those with specifications of 63A or less, face challenges in generating sufficient magnetic field force to reliably attract the armature and ensure short-circuit protection.
Innovation Solution
A clapping type electromagnetic tripping system with a U-shaped iron core, an armature, a heating element, and a bimetallic element, where a bracket extends into the iron core's U-shaped groove, and a wire surrounds the iron core and bracket, forming a magnetic loop that attracts the armature effectively, enhancing the magnetic field force and reliability of the tripping mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electromagnetic tripping system is used with standard wire configuration, then the structure is simple, but the magnetic field force is insufficient to reliably attract the armature in low-current applications (63A or less)
Solution Approach 1:
The wire is pre-configured to surround the iron core and bracket in a specific pattern before assembly, creating a preliminary magnetic field pathway that ensures sufficient magnetic field force is generated when current flows, thereby guaranteeing reliable armature attraction without requiring complex additional components
Solution Approach 2:
The wire serves as an intermediary element that not only connects electrical components but also acts as part of the magnetic circuit by surrounding the iron core and bracket. This dual function enhances the magnetic field force while maintaining structural simplicity, resolving the contradiction between reliability and complexity
2Force
If the magnetic loop structure is optimized with wire surrounding the iron core and bracket, then the magnetic field force increases, but the manufacturing complexity increases
Solution Approach 1:
The wire is integrated to perform multiple functions simultaneously: it connects the heating element to the connecting plate, surrounds the iron core and bracket to enhance the magnetic circuit, and provides structural support. This merging of functions increases magnetic field force while avoiding the need for separate components, thereby maintaining ease of manufacture
Solution Approach 2:
The wire is designed as a multi-functional element that serves both electrical connection and magnetic field enhancement purposes. By making the wire universal in its function, the system achieves higher magnetic field force without proportionally increasing manufacturing complexity, as the same component fulfills multiple roles
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 system ensures reliable attraction of the armature and effective tripping action, suitable for low-current molded case circuit breakers, particularly in specifications of 63A or less, by optimizing the magnetic loop structure and wire configuration to generate sufficient magnetic field force.
Implementation Method 1
an electromagnetic field is generated on an iron core using a short-circuited current flowing through a heating element
Implementation Method 2
the generated magnetic field force is not sufficient to attract the armature
Data Source
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AI summary
A clapping type electromagnetic tripping system comprises an iron core with a U-shaped structure, an armature, a heating element, a bimetallic element and a connecting plate; a bracket extends into a U-shaped groove of the iron core and is fixedly connected with the iron core, and a wire connecting the heating element and the connecting plate surrounds the iron core and the bracket at least one lap; the bracket surrounded by at least one lap of the wire is fixedly connected with the middle part of the heating element, the bottom end of the heating element and the bottom end of the bimetallic element are fixedly connected with a supporting member together, and the armature is hung on the bracket surrounded by the wire; and the armature and the iron core surrounded by at least one lap of the wire are arranged oppositely to form a magnetic loop, and one end of the armature is attracted by the iron core so as to swing when short-circuit current is generated. The clapping type electromagnetic tripping system disclosed by the present invention-creation is simple and reasonable in structure and can enable the armature to be attracted reliably.