Electromagnetic Relay Yoke Extension for Stable Attractive Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromagnetic relays experience fluctuations in attractive force due to varying current in the excitation coil, leading to unstable contact noise when the movable element moves between positions.
Innovation Solution
The electromagnetic device incorporates a yoke extension that projects beyond the contact face of the stator, forming a magnetic path with a smaller magnetic resistance, which maintains magnetic saturation of the stator and reduces fluctuations in magnetic flux and attractive force, even with fluctuating current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current in the excitation coil is varied, then the electromagnetic relay can control different loads, but the attractive force fluctuates causing unstable contact noise
Solution Approach 1:
The yoke extension acts as an intermediary magnetic path that mediates between the excitation coil and the stator. By providing an additional magnetic flux pathway that extends beyond the stator's contact face, it stabilizes the magnetic circuit and reduces fluctuations in attractive force, thereby stabilizing contact noise while allowing current variation for different load control
Solution Approach 2:
The invention changes the magnetic path parameters by extending the yoke beyond the stator's contact face. This structural parameter change creates a larger magnetic path area that reduces magnetic resistance and stabilizes magnetic flux distribution, thereby reducing attractive force fluctuations and contact noise variability while maintaining adaptability to different currents
2Reliability
If the magnetic path is extended to reduce magnetic resistance, then magnetic flux stability improves, but the device structure becomes more complex
Solution Approach 1:
The yoke is segmented into two functional parts: the main yoke body that forms the core magnetic path, and the yoke extension that protrudes beyond the stator's contact face. This segmentation allows the extension to specifically address magnetic flux stability without requiring complete redesign of the entire yoke structure, thus improving reliability while minimizing added complexity
Solution Approach 2:
Instead of extending the entire yoke structure uniformly, only a partial extension is provided beyond the stator's contact face. This partial action is sufficient to achieve the desired magnetic flux stability and reduce attractive force fluctuations, avoiding the unnecessary complexity that would result from a complete yoke extension
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 stabilizes the attractive force and reduces contact noise variability, ensuring consistent operation of the electromagnetic relay regardless of current fluctuations in the excitation coil.
Implementation Method 1
magnetic flux generated at an excitation coil
Implementation Method 2
maintains magnetic saturation of the stator
Implementation Method 3
magnetic flux generated at the excitation coil
Implementation Method 4
attractive force that attracts a movable element to a stator
Data Source
AI summary
An electromagnetic device includes an excitation coil, a stator magnetically combined with the excitation coil, a movable element configured to, when current is flown in the excitation coil, be attracted to the stator by magnetic flux generated at the excitation coil to move in a first direction, and move to a position to be in contact with the stator, a yoke having a first end and a second end, and forming a part of a magnetic path for the magnetic flux generated at the excitation coil, and a yoke extension connected to the second end of the yoke and magnetically combined with the yoke, the stator, and the movable element. An end of the yoke extension in the first direction is positioned on a side of the first direction with respect to an end of the stator in the second direction.