L-Shaped Actuator Leverage for Compact Electromagnetic Relay
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Solution Overview
Problem
Electromagnetic relays designed for large current applications often require increased dimensions to manage heat dissipation and movement forces, leading to larger sizes and reduced efficiency.
Innovation Solution
The design incorporates an L-shaped actuator with a pivot axis at one end and an armature attached to the opposite end, allowing for increased distances between the pivot axis and the armature, and between the pivot axis and the movable spring member, which reduces the force required to shift the movable contact, thereby minimizing the relay's dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dimensions of the electromagnetic relay are increased to carry large current, then the heat dissipating ability and durability are improved, but the size of the relay increases
Solution Approach 1:
The actuator employs an L-shaped configuration with a pivot axis positioned at one end, creating a lever arm that extends perpendicular to the electromagnetic force direction. This dimensional arrangement allows the force application point to be maximally distant from the pivot, achieving mechanical advantage without increasing the overall relay envelope in the force generation direction.
Solution Approach 2:
The actuator is designed as a pivoting lever rather than a linear actuator, allowing rotational motion to amplify the electromagnetic force. The pivot mechanism enables the same electromagnetic force to generate greater moment at the contact point, reducing the need for larger electromagnetic components to achieve the same contact force.
2Reliability
If the dimensions of the electromagnetic relay are increased to increase the movement force of the movable contact, then the contact durability is improved, but the size of the relay increases
Solution Approach 1:
The L-shaped actuator creates a moment arm that extends in a direction perpendicular to the electromagnetic force, allowing the force application point to be maximally distant from the pivot axis. This dimensional arrangement amplifies the contact force without requiring proportionally larger electromagnetic components.
Solution Approach 2:
The actuator geometry is optimized to maximize the distance between the pivot axis and the force application point, changing the mechanical leverage parameter. This geometric optimization allows smaller electromagnetic components to generate sufficient contact force for durable operation.
3Force
If the distance between the pivot axis and the armature is increased to reduce the force required, then the dimensions of the relay are reduced, but the actuator complexity increases
Solution Approach 1:
The actuator is segmented into distinct functional portions: the L-shaped lever body, the pivot axis mechanism, and the armature mounting section. This segmentation allows each portion to be optimized independently, with the L-shape providing mechanical advantage while the pivot mechanism handles rotation, reducing overall complexity despite the increased distance.
4Ease of operation
If the distance between the pivot axis and the movable spring member is increased to reduce pivoting angle, then the dimensions of the actuator are reduced, but the engagement point positioning becomes more critical
Solution Approach 1:
The L-shaped actuator positions the movable spring member engagement point at the end of the second arm, maximizing the perpendicular distance from the pivot axis. This dimensional arrangement achieves the required contact movement with minimal pivoting angle while the rigid L-shaped structure maintains precise engagement point positioning through its inherent geometric stability.
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 enables the electromagnetic relay to efficiently interrupt large currents while maintaining a compact size, reducing the dimensions and weight compared to conventional relays, making it suitable for large current applications.
Implementation Method 1
an electromagnet; an armature driven by the electromagnet
Implementation Method 2
a movable spring member movably arranged relative to the electromagnet and carrying a movable contact
Data Source
AI summary
An electromagnetic relay including an electromagnet, an armature driven by the electromagnet, a movable spring member carrying a movable contact, a fixed member carrying a fixed contact, an actuator arranged between the armature and the movable spring member. The actuator pivots about a pivot axis by an operation of the electromagnet to make the movable contact brought into contact with or separated from the fixed contact. The actuator includes a generally L-shaped body, the pivot axis being defined at a first end of a first arm of the L-shaped body. The armature is attached to the actuator at a second end of a second arm of the L-shaped body opposite to the first end. The movable spring member is engaged with the actuator at a point defined in the second arm of the L-shaped body.