High-Voltage DC Relay with Movable Magnetizer for Short Circuit Resistance
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Solution Overview
Problem
High-voltage DC relays face challenges with contact bounce due to electro-dynamic repulsion forces during short circuits, which weaken breaking ability and conflict with compact and lightweight design requirements.
Innovation Solution
A relay design featuring a movable first magnetizer and a fixing magnetizer, where the distance between them is adjustable based on current flow, utilizing a moving part and elastic forces to manage magnetic attraction and repulsion forces, enhancing anti-short circuit and breaking abilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary anti-short circuit structure is employed, then the ability to withstand short circuit is significantly enhanced, but the breaking ability is weakened
Solution Approach 1:
The patent employs a movable magnetizer instead of a stationary one, allowing the magnetic field strength to dynamically adjust during operation. The magnetizer can move closer to the movable contact piece during short circuit conditions to enhance holding force, and move away during normal breaking operations to maintain breaking ability, thus resolving the contradiction between withstanding short circuit and maintaining breaking capability
2Force
If the size of the coil is increased to increase the holding force of the movable core, then the holding force is improved, but the compact and lightweight design is compromised
Solution Approach 1:
The movable magnetizer allows the system to achieve high holding force dynamically during short circuits without requiring a larger coil. By adjusting the position of the magnetizer, the magnetic field concentration is optimized, providing sufficient holding force for small current values while maintaining a compact coil design for lightweight construction
3Reliability
If the distance between the first magnetizer and the movable member is reduced to enhance magnetic attraction, then the anti-short circuit ability is improved, but the breaking performance is weakened
Solution Approach 1:
The patent makes the distance between the first magnetizer and the movable member dynamically adjustable. During short circuit conditions, the magnetizer moves closer to enhance magnetic attraction and prevent contact bounce. During normal breaking operations, the magnetizer moves away to reduce magnetic attraction and maintain breaking performance, thus resolving the contradiction between anti-short circuit ability and breaking performance
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 adjustable distance between magnetizers effectively resists electro-dynamic repulsion forces, improving anti-short circuit ability and maintaining breaking performance while maintaining a compact and lightweight design.
Implementation Method 1
utilizing a moving part and elastic forces to manage magnetic attraction and repulsion forces
Implementation Method 2
contact bounce caused by the electro-dynamic repulsion force of contacts in the high-voltage DC relay due to short circuit current
Implementation Method 3
a first elastic part for providing an elastic force to the moving part, so that the first magnetizer has a trend to move away from the movable member
Data Source
AI summary
A relay includes a contact container having a contact chamber and a pair of first through holes; a pair of static contact leading-out terminals passing through the pair of first through holes; a moving part; a first magnetizer within the contact chamber and connected with the moving part; a movable member movably within the contact chamber and including a movable contact piece for contacting with or separating from the static contact leading-out terminals; and a fixing magnetizer fixedly arranged within the contact chamber. 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.