Relay Movable Contact Yoke Structure Against Contact Separation
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Solution Overview
Problem
Existing direct current relays face issues with electromagnetic repulsive forces causing movable contacts to separate from fixed contacts, leading to malfunctions and reduced reliability, durability, and instability, despite existing solutions only addressing electromagnetic force attenuation.
Innovation Solution
A movable contact part with a structured upper yoke and arm part that attenuates electromagnetic repulsive forces by reducing weight and maintaining magnetic strength, featuring a cover part with a thinner arm part and a slimming groove, coupled with a lower yoke for stable support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the movable contact is only elastically supported by the elastic part without additional structures, then the device complexity is reduced, but the reliability deteriorates due to electromagnetic repulsive force causing contact separation
Solution Approach 1:
The movable contact part is divided into multiple functional components: the movable contact itself, the elastic part for elastic support, and the magnetic force generating part with upper and lower yokes for magnetic force generation. This segmentation allows each component to perform its specific function independently, resolving the contradiction by adding functionality without excessive complexity.
Solution Approach 2:
The magnetic force generating part acts as an intermediary between the electromagnetic repulsive force and the movable contact. By generating an opposing magnetic force through the upper and lower yokes, it mediates the contact stability issue, preventing separation caused by electromagnetic repulsion while maintaining a relatively simple overall structure.
2Reliability
If a separate member for preventing contact escape is added, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The magnetic force generating part serves multiple functions simultaneously: it generates magnetic force to counteract electromagnetic repulsion, provides structural support for the movable contact, and prevents contact escape. This multi-functionality improves reliability without requiring additional separate members, thus avoiding increased device complexity.
Solution Approach 2:
The function of preventing contact escape is merged into the magnetic force generating part rather than being implemented as a separate member. The upper and lower yokes are integrated to form a unified structure that provides both magnetic force generation and contact retention, reducing overall device complexity while maintaining reliability.
3Force
If the yoke structure is designed with varying thickness (thinner arm part), then the electromagnetic repulsive force is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The yoke structure employs local quality variation with different thicknesses in different regions. The arm part is designed thinner than the main body to locally reduce electromagnetic repulsive force where it acts on the movable contact, while maintaining sufficient thickness in other areas for structural integrity. This localized approach reduces overall force without requiring extreme manufacturing precision across the entire component.
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 structured yoke design effectively reduces electromagnetic repulsive forces, enhances operation reliability, durability against vibration and shock, and ensures stable contact, improving the overall performance of the direct current relay.
Implementation Method 1
an upper yoke which is located on one side of the movable contact, surrounds a portion of the movable contact and forms a magnetic force; and a lower yoke which is located on the other side of the movable contact, supports the movable contact and forms a magnetic force
Implementation Method 2
When the control power is applied, the plurality of coils form an electromagnetic field. The fixed core and the movable core are magnetized by the electromagnetic field, and electromagnetic attraction is generated between the fixed core and the movable core.
Data Source
AI summary
Disclosed are a movable contact part and a direct current relay including same. The movable contact part comprises an upper yoke. The upper yoke generates a magnetic force that attenuates the electromagnetic repulsive force generated between a movable contact and a fixed contact.The upper yoke includes a cover part covering the movable contact from above and an arm part connected to the cover part and covering the movable contact from both sides. The arm part is thinner than the cover part. A curved portion of the arm part is shorter than the cover part and an extension portion.Thus, even though the total weight of the upper yoke is reduced, the area of the upper yoke is increased, and the thickness and length of a support part can be maintained. Consequently, the intensity of the magnetic force of the upper yoke can be enhanced.