Relay Magnetizer Dynamics for High-Voltage DC Breaking
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Solution Overview
Problem
High-voltage DC relays face challenges with contact bounce due to electro-dynamic repulsion forces, which are exacerbated by anti-short circuit structures that compromise breaking ability, making it difficult to achieve both high short circuit and breaking performance while maintaining a compact and lightweight design.
Innovation Solution
A relay design featuring a movable first magnetizer that adjusts its distance from a movable member based on current flow, using a moving part and elastic force to optimize magnetic attraction and repulsion forces, allowing for enhanced anti-short circuit and breaking capabilities without increasing coil size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the coil size is increased to increase holding force, then holding force is enhanced, but device size and weight increase
Solution Approach 1:
The moving member enables dynamic adjustment of the upper magnetizer's position, allowing the system to achieve high holding force when needed without requiring a permanently large coil. The dynamic positioning optimizes magnetic field distribution, providing sufficient holding force during operation while avoiding the need for oversized components that would increase weight
Solution Approach 2:
The system changes the magnetic field parameters dynamically by adjusting the distance between the upper magnetizer and movable core. This parameter change allows the same coil to produce varying magnetic field strengths, achieving high holding force when required without permanently increasing coil size and weight
2Force
If the distance between magnetizer and movable member is decreased, then magnetic attraction force is enhanced, but breaking ability is weakened
Solution Approach 1:
The distance between the upper magnetizer and movable member is made dynamically adjustable through the moving member mechanism. This allows the system to maintain small distance for strong magnetic attraction during normal operation, while enabling controlled increase in distance during breaking operation, thus resolving the contradiction between magnetic attraction force and breaking ability
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 mitigates contact bounce and improves both anti-short circuit and breaking abilities, ensuring reliable operation while maintaining a compact and lightweight form factor.
Implementation Method 1
a first magnetizer arranged within the contact chamber and connected with the moving part... the first magnetizer being arranged at one side of the movable contact piece facing the static contact leading-out terminals
Implementation Method 2
a first elastic part arranged within the contact chamber and connected with the moving part... the first elastic part configured to provide an elastic force to the moving part
Data Source
AI summary
A relay includes an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber; a pair of static contact leading-out terminals passing through the pair of first through holes; a fixing member including a fixing part and a connector with a tubular structure, the connector is fixedly connected between the insulating cover and the fixing part; a moving part within the contact chamber and movably connected to the fixing member; a first magnetizer within the contact chamber and connected with the moving part; and a movable member within the contact chamber and including a movable contact piece. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.