Electromagnetic Relay Yoke Notch Layout for Magnetic Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromagnetic relays have a small contact area between the first yoke and the second yoke, leading to decreased magnetic efficiency due to the opening for pulling out the coil terminal being formed at their point of contact.
Innovation Solution
The electromagnetic relay design includes a notch in the first side portion of the second yoke, positioned closer to the contact device, increasing the contact area between the first and second yokes, and allowing the coil terminal to be easily connected to an external terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the opening for pulling out the coil terminal is formed at the contact portion between the first yoke and the second yoke, then the coil terminal can be pulled out, but the contact area between the first yoke and the second yoke becomes small, reducing magnetic efficiency
Solution Approach 1:
The second yoke is segmented into a first side portion, a second side portion, and a center portion, with the notch formed only in the first side portion. This segmentation allows the opening to be located away from the contact area between yokes, preserving magnetic efficiency while enabling coil terminal extraction.
Solution Approach 2:
The notch is localized to the first side portion of the second yoke, which is not involved in the magnetic contact path. This local modification allows terminal extraction without affecting the contact quality between the first yoke and the second yoke at their contact portions.
2Reliability
If the notch is formed at a position closer to the first yoke, then magnetic efficiency is maintained, but the coil terminal is harder to connect to external terminals
Solution Approach 1:
The coil terminal is routed through the notch in the first side portion and extends in a direction that facilitates connection to external terminals. This spatial arrangement in multiple dimensions allows the terminal to be positioned for easy external connection while the notch remains in a location that preserves yoke contact area.
3Reliability
If the contact area between the first yoke and the second yoke is increased, then magnetic efficiency improves, but the opening for coil terminal extraction becomes harder to accommodate
Solution Approach 1:
By segmenting the second yoke and locating the notch in the first side portion rather than at the contact interface, the design accommodates both large yoke contact area for magnetic efficiency and adequate space for coil terminal extraction through the notch.
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 enhances magnetic efficiency by maintaining a larger contact area between the yokes and facilitates easy connection of the coil terminal, thereby reducing the likelihood of decreased magnetic efficiency and improving overall performance.
Implementation Method 1
a driving device configured to drive the contact device by electromagnetic force
Implementation Method 2
the contact area between the first yoke and the second yoke is small, and thereby the magnetic efficiency of the electromagnet decreases
Data Source
AI summary
An electromagnetic relay includes a contact device; a driving device including a coil, a spool, and first and second yokes; and a coil terminal. The second yoke, which is attached to the first yoke, includes a first side portion, a second side portion, a center portion extending therebetween, and a notch. The center portion of the second yoke is disposed between the contact device and the spool. The notch is located in the first side portion of the second yoke, at a position closer to the contact device than to the portion of the first side portion in contact with the first yoke. The coil terminal extends out of the electromagnetic relay via the notch.