Circuit Breaker Core Geometry for Asymmetrical Magnetic Actuation
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Solution Overview
Problem
Existing circuit breaker mechanisms for high current bus bars lack asymmetrical characteristics, leading to symmetrical behavior regardless of current direction, and require higher activation currents.
Innovation Solution
The design incorporates a core with a specific configuration of yokes, air gaps, and permanent magnets in the second yoke and movable armature, which alters the magnetic flux directionally to create asymmetrical characteristics, reducing the activation current and enabling unidirectional operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If permanent magnets are added to create asymmetrical magnetic flux, then activation current is reduced and unidirectional operation is enabled, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by introducing permanent magnets into one of the yokes (second yoke) to create asymmetrical magnetic flux distribution. This asymmetry causes the magnetic flux to be amplified in one current direction and attenuated in the opposite direction, enabling unidirectional operation and reducing activation current for that direction.
Solution Approach 2:
The permanent magnets act as intermediaries that modify the magnetic flux path and intensity. By placing permanent magnets in the second yoke, the system leverages their magnetic field to amplify flux in the desired direction and attenuate it in the opposite direction, thereby reducing the activation current requirement without requiring complete redesign of the circuit breaker mechanism.
2Adaptability or versatility
If permanent magnets are added to amplify magnetic flux in one direction, then unidirectional operation is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent implements unidirectional operation by creating an asymmetrical configuration where permanent magnets are installed in only one yoke (the second yoke) rather than both. This asymmetrical placement allows the circuit breaker to differentiate between current directions, achieving unidirectional protection capability while maintaining compatibility with existing circuit breaker mechanisms.
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 achieves asymmetrical characteristics in circuit breaker mechanisms, allowing for lower activation currents and unidirectional operation, while being compatible with existing circuit breaker mechanisms.
Implementation Method 1
generate a unidirectional unique magnetic flux inside the main frame and the movable core, the said magnetic flux creating a first force on the movable core that tends to maintain it in its first position
Implementation Method 2
the said magnetic flux creating a first force on the movable core that tends to maintain it in its first position
Implementation Method 3
a first current flowing through the main frame and generating a first flux inside the main frame and the movable core in the same direction as the magnetic flux exceeds a first limit value
Data Source
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AI summary
The invention relates to a core for a circuit breaker mechanism and a circuit breaker mechanism designed for a high current bus bars. A core for a circuit breaker mechanism comprising: a first limb (2), a second limb (3), a first yoke (4), a second yoke (5), a third yoke (6); wherein between the first limb (2) and the second limb (3) there are the first yoke (4), the second yoke (5) and the third yoke (6), wherein the third yoke (6) has a smaller cross-section area then the second yoke (5), wherein the second yoke (5) comprises a first air gap (7) and at least one opening (9), where edges (10) of the first air gap (7) are tilted such that the first air gap (7) forms a trapezoid, and wherein the third yoke (6) comprises a second air gap (8).