HVDC Relay Moving Iron Core Guide Mechanism
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Solution Overview
Problem
In high voltage direct current (HVDC) relays, the magnetic force causes a pushrod to deflect radially, leading to increased frictional forces between the moving iron core and the magnetic conductive cylinder, resulting in decreased sensitivity, delayed response, increased power consumption, and potential relay burnout.
Innovation Solution
A moving iron core guide mechanism is introduced, featuring a pushrod with a lower bushing inside the magnetic conductive cylinder, ensuring coaxiality and reducing frictional forces through a lower guide hole, along with upper and lower bushings to maintain alignment and prevent deflection, thereby enhancing sensitivity and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pushrod is allowed to move freely under magnetic force, then the relay structure is simple, but the pushrod deflects radially causing increased friction and decreased sensitivity
Solution Approach 1:
The guide hole acts as an intermediary component between the pushrod and the magnetic conductive cylinder. It constrains the pushrod to move only along the axial direction, preventing radial deflection while maintaining the simplicity of the overall relay structure. The guide hole mediates the conflict by providing a physical constraint that ensures coaxiality without adding complex external guidance mechanisms.
2Manufacturing precision
If the pushrod is constrained to maintain coaxiality, then sensitivity is improved, but the device structure becomes more complex
Solution Approach 1:
The guide hole serves as a simple intermediary structure that maintains coaxiality without significantly increasing device complexity. By integrating the guide hole directly into the magnetic conductive cylinder, the design achieves precise alignment control while keeping the overall structure compact and straightforward.
Solution Approach 2:
The guide hole constrains the pushrod motion from three-dimensional free movement to one-dimensional axial movement. This dimensional reduction eliminates radial deflection and ensures coaxiality, achieving precision control through a simple geometric constraint rather than complex mechanical guidance systems.
3Device complexity
If the pushrod deflects radially, then the relay structure remains simple, but frictional force increases and power consumption rises
Solution Approach 1:
The guide hole acts as a mediator that reduces frictional losses by preventing radial deflection of the pushrod. By constraining the pushrod to move only axially, the guide hole eliminates unnecessary contact and friction between the pushrod and the magnetic conductive cylinder, thereby reducing energy loss without requiring additional lubrication or complex low-friction mechanisms.
Solution Approach 2:
By restricting pushrod motion to one dimension (axial direction only), the guide hole eliminates radial movement that would generate friction. This dimensional constraint directly reduces energy loss by ensuring that all magnetic force is converted into useful linear motion rather than being dissipated through frictional contact.
4Device complexity
If the pushrod deflects radially, then no additional guiding components are needed, but response time is delayed
Solution Approach 1:
The guide hole serves as a time-saving intermediary by pre-establishing the correct motion path for the pushrod. This eliminates the time delay that would otherwise occur due to radial deflection and friction, allowing the pushrod to respond immediately to magnetic force changes. The guide hole ensures that the pushrod moves directly and quickly along the axial direction without deviation.
Solution Approach 2:
By constraining pushrod motion to one dimension (axial direction), the guide hole eliminates the time-consuming radial deflection that occurs in three-dimensional free movement. This dimensional restriction ensures that the pushrod responds instantly to magnetic actuation, significantly reducing response time without adding complex active control mechanisms.
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 mechanism improves the relay's sensitivity and response time, decreases power consumption, and lowers manufacturing costs by minimizing frictional forces and maintaining coaxial alignment, ensuring reliable and efficient operation.
Implementation Method 1
a pushrod fixed on a moving iron core might radially deflect toward a magnetic conductive cylinder due to a magnetic force
Implementation Method 2
a frictional force between the two and an inner wall of the magnetic conductive cylinder is increased
Data Source
AI summary
The present invention discloses a moving iron core guide mechanism for an HVDC relay, comprising a pushrod, an upper section of the pushrod being located above a yoke plate and fixed with a moving contact assembly, a middle section and a lower section of the pushrod passing through the yoke plate downward, the middle section of the pushrod being fixed with a moving iron core; the moving iron core is located inside a magnetic conductive cylinder of a U-shaped yoke; a lower bushing is fixed inside the magnetic conductive cylinder, and the lower bushing is located below the moving iron core; a lower guide hole running from top to bottom is formed on the lower bushing; and the lower section of the pushrod is always fitted inside the lower guide hole of the lower bushing, and the pushrod is in smooth contact with an inner wall of the lower guide hole. In the present invention, the up-and-down motion of the moving iron core and the pushrod can become easier while the turns of the coil can be maintained; and the production cost can be reduced when the moving iron core and the pushrod are in normal use.