Electromagnetic Relay Variable Press Position Mechanism
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Solution Overview
Problem
Conventional electromagnetic relays with thin electromagnets face reduced attraction force due to fewer coil windings, leading to suboptimal operation characteristics, necessitating a solution for achieving desired operation even with reduced thickness.
Innovation Solution
The electromagnetic relay incorporates a movable iron piece with a card pressing portion and a press position changing mechanism, allowing for efficient force transmission and reduced initial driving force, enabling smooth rotation and deformation of the movable contact piece even with a smaller attraction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the electromagnet is formed thin to reduce the thickness of the electromagnetic relay, then the thickness is reduced, but the number of coil windings is restricted and the attraction force is reduced
Solution Approach 1:
The patent applies dynamics by making the press position of the card variable during the rotation of the movable iron piece. The card pressing portion initially presses at a position distant from the fulcrum, then transitions to pressing at the card pressing portion position as rotation progresses. This dynamic adjustment of the press position allows the system to adapt to changing attraction forces during operation, enabling thin electromagnet design while maintaining operational effectiveness.
2Length of moving object
If the electromagnet is formed thin to reduce the thickness of the electromagnetic relay, then the thickness is reduced, but the desired operation characteristics are not obtained due to reduced attraction force
Solution Approach 1:
The patent applies dynamics by making the press position of the card variable during the rotation of the movable iron piece. The card pressing portion initially presses at a position distant from the fulcrum, then transitions to pressing at the card pressing portion position as rotation progresses. This dynamic adjustment of the press position allows the system to adapt to changing attraction forces during operation, enabling thin electromagnet design while maintaining operational effectiveness.
3Device complexity
If the card pressing portion directly presses the card to rotate the movable iron piece, then the structure is simple, but a large attraction force is required which cannot be achieved with thin electromagnets
Solution Approach 1:
The patent applies dynamics by making the press position of the card variable during the rotation of the movable iron piece. The card pressing portion initially presses at a position distant from the fulcrum, then transitions to pressing at the card pressing portion position as rotation progresses. This dynamic adjustment of the press position allows the system to adapt to changing attraction forces during operation, enabling thin electromagnet design while maintaining operational effectiveness.
Solution Approach 2:
The patent applies preliminary action by having the card pressing portion press the card at a position distant from the fulcrum before the movable iron piece reaches the card pressing portion position. This preliminary pressing action at a position that requires less force allows the thin electromagnet to initiate rotation successfully, after which the press position transitions to the final card pressing portion position.
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 allows for stable and efficient operation of the movable iron piece and movable contact piece, maintaining desired operation characteristics despite the reduced thickness and attraction force, ensuring reliable contact switching.
Implementation Method 1
a movable iron piece is rotated by excitation or non-excitation of an electromagnet
Implementation Method 2
a movable contact piece is elastically deformed by the movable iron piece through a card
Data Source
AI summary
The present invention provides an electromagnetic relay that can achieve desired operation characteristics by simple and inexpensive construction even if it has a small thickness. Therefore, a movable iron piece 20 is rotated by excitation or non-excitation of an electromagnet, a movable contact piece 43 is elastically deformed through a card 21, and a movable contact 46 opens and closes fixed contacts of fixed contact pieces. The movable iron piece 20 is provided with a card pressing portion 36 capable of pressing the card 21. The card 21 is provided with a contact piece pressing portion 37 capable of pressing the movable contact piece 43 by being rotated around a fulcrum. At least one of the movable iron piece and the card is provided with a press position changing portion, wherein when rotating the movable iron piece 20, force transmission from the movable iron piece 20 to the card 21 is performed at a position more distant from a press position by the card pressing portion 36 of the iron piece 20 with respect to the fulcrum, and then performed by the card pressing portion 36.