Lower Yoke Structure for DC Relay Contact Repulsion Cancellation
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Solution Overview
Problem
Existing direct current relays face issues with operation reliability, durability against vibration and shock, incomplete cancellation of electromagnetic repulsive force between fixed and movable contacts, and lack of stable support for movable contacts, leading to potential malfunction and failure.
Innovation Solution
A movable contact part with a lower yoke structure featuring a support part and a wing part, where the wing part has a thinner thickness than the support part, forming a slimming groove to reduce weight and increase surface area, while the support part maintains thickness to generate a magnetic force that cancels electromagnetic repulsive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the movable contact is only elastically supported by the elastic part without additional members to prevent escape, then the device complexity is reduced, but the reliability deteriorates due to potential contact separation under electromagnetic repulsive force
Solution Approach 1:
The patent combines the support function and the electromagnetic repulsive force cancellation function into a single integrated lower yoke structure. The lower yoke both supports the movable contact and generates magnetic force to counteract electromagnetic repulsion, eliminating the need for separate components and thereby improving reliability without significantly increasing device complexity.
Solution Approach 2:
The lower yoke is designed to perform multiple functions simultaneously: it serves as a support structure for the movable contact and as a magnetic force generating element to cancel electromagnetic repulsive force. This multi-functional design reduces the number of components needed while enhancing operational reliability.
2Reliability
If additional members are added to prevent movable contact escape and cancel electromagnetic repulsive force, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines the support function and the electromagnetic repulsive force cancellation function into a single integrated lower yoke structure. The lower yoke both supports the movable contact and generates magnetic force to counteract electromagnetic repulsion, eliminating the need for separate components and thereby improving reliability without significantly increasing device complexity.
Solution Approach 2:
The lower yoke is designed to perform multiple functions simultaneously: it serves as a support structure for the movable contact and as a magnetic force generating element to cancel electromagnetic repulsive force. This multi-functional design reduces the number of components needed while enhancing operational reliability.
3Strength
If the lower yoke structure is designed with varying thickness (support part thicker than wing part), then the magnetic force generation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The lower yoke is designed with non-uniform thickness distribution, where the support part has greater thickness than the wing part. This local quality variation optimizes magnetic force generation at critical locations while maintaining overall structural integrity, balancing performance enhancement with manufacturing feasibility.
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 structure enhances operation reliability, durability against vibration and shock, and stable support, effectively canceling electromagnetic repulsive force without additional components, improving the overall performance of the direct current relay.
Implementation Method 1
the lower yoke includes a support part which is formed in a plate shape having a predetermined thickness; and a wing part which is continuous with the support part and formed to have a thinner thickness than the support part
Implementation Method 2
an electromagnetic repulsive force is generated as current flows. The repulsive force may act such that the movable contact 1220 is spaced apart from the fixed contact 1210
Data Source
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AI summary
Disclosed are a movable contact part and a direct current relay comprising same. The movable contact part, according to one embodiment of the present invention, comprises a lower yoke. The lower yoke forms a magnetic force for canceling an electromagnetic repulsive force generated between a movable contact and a fixed contact. The lower yoke comprises: a support part for supporting the movable contact; and a wing part connected to the support part. The wing part is formed so as to be thinner than the support part. According to one embodiment, the wing part is formed so as to be shorter than the support part. Thus, the total weight of the lower yoke is decreased, while the area of the lower yoke is increased, and the thickness and length of the support part may be maintained. Consequently, the lower yoke magnetic strength, operational reliability, and vibration or impact resistance may be improved.