Movable Contact Assembly With Dual Yokes for Stable Contactor Contact
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Solution Overview
Problem
Existing electromagnetic contactors struggle to maintain a stable contact between movable and fixed contacts due to electromagnetic repulsive forces, leading to unreliable connections and potential vibration or rotation, and lack mechanisms to mitigate these issues.
Innovation Solution
A movable contact assembly with a structure that includes an upper yoke and a lower yoke, partially overlapping to generate a magnetic attractive force, effectively canceling repulsive forces and stabilizing the contact, while reducing the required force for movement and maintaining a stable attractive state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple yokes are arranged farther apart from each other, then the device complexity is reduced and ease of manufacture is improved, but the magnetic attractive force decreases and the ability to quickly offset electromagnetic repulsive force deteriorates
Solution Approach 1:
The patent transitions from arranging multiple yokes in a horizontal plane to stacking yokes vertically in the axial direction. This dimensional change allows the magnetic circuit to effectively counteract electromagnetic repulsive force without requiring large horizontal spacing, thereby maintaining contact reliability while simplifying the overall structure and improving manufacturability.
Solution Approach 2:
Instead of using multiple yokes arranged horizontally to generate magnetic attractive force, the patent inverts the approach by using a single yoke structure with magnetic circuits positioned at both ends, oriented vertically along the axial direction. This inverted arrangement efficiently counters the electromagnetic repulsive force while reducing structural complexity.
2Reliability
If multiple yokes are arranged closer to each other, then the magnetic attractive force increases and electromagnetic repulsive force is offset more quickly, but the device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent merges multiple yoke functions into a single integrated yoke structure. The yoke includes magnetic circuits at both ends positioned along the axial direction, combining the functions of multiple separate yokes into one unified component. This reduces device complexity while maintaining the ability to generate sufficient magnetic attractive force to offset electromagnetic repulsion.
Solution Approach 2:
The patent resolves the complexity issue by reorienting the magnetic circuit arrangement from horizontal to vertical along the axial direction. This allows the magnetic attractive force to be generated effectively without requiring multiple closely-spaced yokes, thereby simplifying the device structure while maintaining contact reliability.
3Device complexity
If a single yoke is used instead of multiple yokes, then the device complexity is reduced, but the magnetic attractive force may be insufficient to offset electromagnetic repulsive force
Solution Approach 1:
The patent achieves sufficient magnetic attractive force with a single yoke by positioning magnetic circuits at both ends of the yoke along the axial direction. This vertical arrangement creates two effective magnetic attraction zones, doubling the force generation capability without requiring multiple separate yokes, thus maintaining low device complexity while ensuring adequate magnetic force.
Solution Approach 2:
The single yoke is segmented into two functional magnetic circuits positioned at opposite ends along the axial direction. Each magnetic circuit independently generates magnetic attractive force, and their combined effect provides sufficient total force to offset electromagnetic repulsive force while keeping the overall structure simple and unified.
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 solution effectively cancels electromagnetic repulsive forces, stabilizes contact, reduces movement force, and suppresses vibration or rotation, enhancing contact reliability and assembly efficiency.
Implementation Method 1
an upper yoke partially surrounding the movable contact and configured to generate a magnetic attractive force together with the lower yoke
Data Source
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AI summary
A movable contact assembly and an electromagnetic contactor including same are disclosed. The movable contact assembly and the electromagnetic contactor including same, according to an aspect of the present invention, may comprise: a movable contact which is provided to be movable in a direction toward a stationary contact and a direction opposite to the stationary contact; a lower yoke which is located adjacent to the movable contact and is provided to be movable along with the movable contact; and an upper yoke which partially covers the movable contact and is configured to form a magnetic attractive force together with the lower yoke; and a movable frame which is coupled to the upper yoke to support the upper yoke and to which the movable contact and the lower yoke are movably coupled.