Magnetic Latching Relay Structure for Fast HVDC Switching
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Solution Overview
Problem
High-voltage DC magnetic latching relays face challenges in sensitivity and quick action due to the magnetic field's holding force affecting the opening and closing states, leading to variations in operation voltage and release voltage differences.
Innovation Solution
Incorporating a first spring between the movable and stationary iron cores to create a magnetic levitation air gap for quick action and a second spring between the movable iron core and yoke plate for quick opening, along with strategically positioned permanent magnets to balance holding forces, and using a tower spring for responsive action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the permanent magnet forms a bi-directional magnetic field loop to hold the relay in open or closed state, then the relay can maintain stable switching states, but the sensitivity of the relay to close and open is affected
Solution Approach 1:
The magnetic circuit is segmented into multiple independent paths by introducing first and second magnetic leakage gaps. The first gap is formed between the movable iron core and stationary iron core, while the second gap is formed between the movable iron core and yoke plate. This segmentation allows the magnetic field to be distributed across different paths, reducing the holding force on the contacts and improving relay sensitivity while maintaining stable state retention.
Solution Approach 2:
Magnetic leakage gaps are introduced as intermediary elements between the magnetic components. These gaps (first gap between movable and stationary iron cores, second gap between movable iron core and yoke plate) act as mediators to control magnetic flux distribution, reducing magnetoresistance and allowing the relay to respond more sensitively to coil signals while maintaining stable latching states.
2Reliability
If the magnetic field exerts holding force on the movable iron core, then the relay can be held in open or closed state, but the operation voltage varies and release voltage difference increases
Solution Approach 1:
The magnetic circuit is divided into multiple flux paths with dedicated leakage gaps. The first magnetic leakage gap between the movable and stationary iron cores, and the second magnetic leakage gap between the movable iron core and yoke plate, segment the magnetic flux to create more predictable and stable operating characteristics, reducing voltage variations during operation.
Solution Approach 2:
By introducing controlled magnetic leakage gaps, the magnetic circuit parameters are changed to optimize performance. The gaps modify the magnetic reluctance and flux distribution, resulting in reduced operation voltage variations and more consistent release voltage characteristics while maintaining reliable state holding.
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 configuration reduces magnetoresistance, minimizes noise, and ensures quick and stable operation by maintaining balanced holding forces, allowing for efficient and responsive high-voltage DC magnetic latching relay performance.
Implementation Method 1
the permanent magnet of the relay forms a bi-directional magnetic field loop in the open and closed states of the relay, and the magnetic field loop exerts a holding force on the movable iron core
Implementation Method 2
the action of a permanent magnet
Implementation Method 3
the switching state of the magnetic latching relay is triggered by a pulsed electrical signal
Implementation Method 4
a first spring is provided between the movable iron core and the stationary iron core, the first spring is configured to achieve a quick action of the relay, a second spring is provided between the movable iron core and the yoke plate, the second spring is configured to achieve a quick opening of the relay
Data Source
AI summary
A high-voltage DC magnetic latching relay, including stationary contact lead-out terminals, a movable spring, a pushing rod component, and a direct-acting magnetic latching magnetic circuit structure including a movable iron core, a coil assembly, a stationary iron core, a yoke plate, a yoke cylinder and permanent magnets. The coil assembly is inside the yoke cylinder and provided with an iron core hole, the stationary iron core is provided in the iron core hole, the movable iron core is provided in the iron core hole and located between the yoke plate and the stationary iron core; the permanent magnets are mounted between the yoke plate and the coil assembly and positions thereof corresponds to a position of the movable iron core; a first spring is provided between the movable iron core and the stationary iron core, a second spring is provided between the movable iron core and the yoke plate.