Parallel Contact Relay Structure for Lower Resistance Heating
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Solution Overview
Problem
High contact resistance in relays leads to increased heat generation, particularly in high-capacity relays that open and close high currents, necessitating a reduction in contact resistance to suppress temperature rise.
Innovation Solution
The relay design includes separate first and second movable contact pieces electrically connected in parallel with fixed terminals, utilizing a link member and a drive device with a coil and movable iron core to distribute current and reduce contact resistance, while the link member is supported by a housing to stabilize operation under increased loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple movable contacts are arranged on a single integrated movable contact piece, then the device complexity is reduced, but the contact stability deteriorates
Solution Approach 1:
The movable contact assembly is divided into multiple independent movable contact pieces (first movable contact piece and second movable contact piece), each carrying specific movable contacts. This segmentation allows each contact piece to independently and stably contact its corresponding fixed contact, improving contact reliability while maintaining manageable structural complexity through modular design.
2Loss of energy
If current flows through multiple contact paths, then the contact resistance is reduced, but the device complexity increases
Solution Approach 1:
The current path is segmented into multiple parallel paths through separate movable contact pieces. Each movable contact piece provides an independent current path to its corresponding fixed contact, distributing the total current and reducing contact resistance and heat generation, while the modular segmented structure keeps the overall device complexity manageable.
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 effectively reduces contact resistance and suppresses temperature rise by dividing current flow and ensuring stable contact between movable and fixed contacts, thereby improving the relay's operational efficiency and reliability.
Implementation Method 1
The drive device moves the first movable contact piece and the second movable contact piece by moving the movable iron core by a magnetic force generated from the coil
Data Source
AI summary
First and second movable contacts are connected to a first movable contact piece. A second movable contact piece is provided separately from the first movable contact piece. Third and fourth movable contacts are connected to the second movable contact piece. A drive device moves the first movable contact piece and the second movable contact piece by moving a movable iron core by a magnetic force generated from a coil. In a state where the first to fourth movable contacts are contacts the first to fourth fixed contacts, respectively, the first movable contact piece and the second movable contact piece are electrically connected in parallel with the first fixed terminal and the second fixed terminal.