Electromagnetic Relay Contact Device Asymmetric Yoke
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Solution Overview
Problem
Conventional electromagnetic relays face challenges in efficiently interrupting short circuit currents and maintaining the closed state against electromagnetic repulsive forces, particularly in varying current ranges, which affects their reliability and compactness.
Innovation Solution
The contact device incorporates a pair of rod-like stators, a movable contact, a housing, and a yoke made of soft magnetic material, where the yoke is asymmetrically fixed to oppose the movable facing surface, linking magnetic flux with the mover to generate an electromagnetic force that counters contact repulsive forces, allowing precise adjustment of the electromagnetic force to suit different current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional electromagnetic relay uses a rod-like stator extending along the movable direction, then the structure is simple, but the device size increases and reliability decreases
Solution Approach 1:
The stator is divided into two separate rod-like members instead of one single rod, allowing independent optimization of each stator's function and position. This segmentation enables better magnetic flux distribution and more reliable contact operation while maintaining structural simplicity.
Solution Approach 2:
The stators are arranged perpendicular to the movable direction of the mover, changing the traditional axial arrangement. This dimensional change reduces the device size in the movable direction while improving magnetic coupling and reliability.
2Ease of manufacture
If the stator extends along the movable direction, then the structure is conventional and easy to manufacture, but the device becomes less compact
Solution Approach 1:
The stators are positioned perpendicular to the mover's movement direction, transforming the magnetic field geometry from axial to radial. This dimensional change compactsthe device in the movement direction while keeping manufacturing processes conventional and simple.
3Device complexity
If the relay uses conventional electromagnetic design, then the structure is straightforward, but it cannot effectively counter contact repulsive forces across varying current ranges
Solution Approach 1:
The relay coil generates a magnetic field in advance that creates electromagnetic attraction force opposing the contact repulsive forces before contacts close. This preliminary action ensures reliable contact maintenance across varying current ranges from 10A to 1000A without complex control circuits.
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 the reliability and compactness of the contact device and electromagnetic relay by effectively opposing contact repulsive forces, enabling efficient operation across a range of short circuit currents, from small to large, while maintaining the closed state until mechanical interruption occurs.
Implementation Method 1
linking magnetic flux with the mover to generate an electromagnetic force that counters contact repulsive forces
Data Source
AI summary
An electromagnetic relay has a contact device and an electromagnet device. An electromagnetic relay has stators which are a pair of rod-like members, and a mover. The mover may face the side of the stator. A housing supports the stator and accommodates the mover. A yoke is fixed to the housing so as to face the movable facing surface and contains a soft magnetic material.