Electromagnetic Relay Segmented Moving Yoke Shock Proof Design
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Solution Overview
Problem
Conventional electromagnetic relays face a trade-off between shock proof and short-circuit proof performance, where improving short-circuit proof performance often compromises shock proof performance and increases product size.
Innovation Solution
The electromagnetic relay design incorporates a moving yoke and two pressing springs, where the second pressing spring maintains contact between the movable and fixed contactors during shocks, allowing for enhanced short-circuit proof performance without compromising shock proof performance or increasing product size, and includes a coil spring design for uniform biasing and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mass of the movable component is increased to improve short-circuit proof performance by increasing drawing force between yokes, then the electromagnetic repulsive force resistance improves, but the shock proof performance deteriorates due to increased impulse force
Solution Approach 1:
The movable component is segmented into separate elements: the moving yoke, the movable contactor, and the movable element. This segmentation allows the moving yoke to be optimized for electromagnetic interaction (providing drawing force) while the movable contactor and element can be optimized for minimal mass (reducing impulse force during shock). The first pressing spring couples these segmented parts, maintaining functionality while resolving the mass contradiction.
2Ease of manufacture
If the movable element, movable yoke, and movable contactor are integrally formed to simplify structure, then manufacturing is easier, but shock proof performance deteriorates because the entire assembly moves together during shock
Solution Approach 1:
The movable component is divided into separate parts: the movable element, the movable contactor, and the moving yoke. These segmented parts are coupled by the first pressing spring, which allows them to move independently during shock while maintaining functional relationships during normal operation. This segmentation improves shock proof performance by allowing differential movement of each 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
This design effectively maintains contact between the movable and fixed contactors during shocks, enhancing short-circuit proof performance without affecting shock proof performance and reducing the need for larger components, thus optimizing both performance and size.
Implementation Method 1
a movable core driven by an electromagnetic force of the excitation coil
Implementation Method 2
a first pressing spring that biases the moving yoke toward the movable contactor
Implementation Method 3
a second pressing spring that biases the movable contactor such that the movable contactor and the fixed contactor are in contact with each other
Data Source
AI summary
An electromagnetic relay includes: an excitation coil; a movable core; a movable contactor that operates by following the movable core; a fixed contactor that is in contact with the movable contactor when the excitation coil is energized; a base that supports the fixed contactor; a fixed yoke fixed to the base; a moving yoke; a first pressing spring that biases the moving yoke toward the movable contactor; and a second pressing spring that biases the movable contactor such that the movable contactor and the fixed contactor are in contact with each other. The moving yoke is disposed to be in contact with a surface of the movable contactor opposite from the fixed contactor and to oppose the fixed yoke through the movable contactor. The moving yoke is provided to be able to contact and separate from the movable contactor.