Electromagnetic Relay Fixed Terminal Lateral Extension
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Solution Overview
Problem
Electromagnetic relays face a decrease in contact force and assembly challenges due to the Lorentz force acting on the movable contact piece, which affects both the operational efficiency and assemblability.
Innovation Solution
The design includes a first and second fixed terminal with support and extending portions positioned apart from the movable contact piece, reducing the Lorentz force and preventing interference during assembly, thereby maintaining contact force and improving assemblability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the movable contact piece is disposed below the first fixed terminal and the second fixed terminal, then the structure is simplified, but the Lorentz force acts on the movable contact piece in an opening direction which weakens the contact force
Solution Approach 1:
The patent changes the spatial arrangement by extending the fixed terminals in the lateral direction (perpendicular to the closing/opening direction) rather than only in the closing direction. This dimensional change allows the current path to be routed away from the movable contact piece, eliminating the Lorentz force issue while maintaining structural simplicity
2Force
If the movable contact piece is disposed between the first fixed terminal and the second fixed terminal, then the Lorentz force acts in the closing direction which maintains contact force, but the movable contact piece interferes with the fixed terminals during assembly
Solution Approach 1:
The patent resolves the assembly interference issue by extending the fixed terminals in the lateral direction, which separates the current path from the movable contact piece's movement path. This allows the movable contact piece to be positioned between the fixed terminals for optimal contact force while eliminating assembly interference through lateral separation
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 suppresses the decrease in contact force and enhances the assemblability of the electromagnetic relay by reducing the Lorentz force and preventing interference between components.
Implementation Method 1
when a current flows from the first fixed terminal 102 through the movable contact piece 101 to the second fixed terminal 103, a magnetic field is generated above and below the movable contact piece 101... the Lorentz force acts on the movable contact piece 101
Data Source
AI summary
A first fixed terminal includes a first support portion and a first extending portion. The first support portion is located in a closing direction with respect to a movable contact piece. The first support portion supports a first fixed contact. The first support portion extends from the first fixed contact in a first lateral direction. The first lateral direction is one direction in a longitudinal direction of the movable contact piece. The first extending portion is connected to the first support portion. The first extending portion extends in the closing direction from the first support portion. The first extending portion is disposed apart from the movable contact piece in the first lateral direction.