Electromagnetic Relay Yoke Attraction Force Contact Separation
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Solution Overview
Problem
Conventional electromagnetic relays face challenges in limiting contact separation due to contact point electromagnetic repulsion forces, which can lead to inadequate bonding between the stationary yoke and the fixed member, and require high-temperature-resistant materials, limiting flexibility in design and material selection.
Innovation Solution
The configuration includes an excitation coil, a movable core, a movable element, stationary terminals with a stationary yoke supported by the terminals, and a movable yoke, generating a yoke attraction force to limit contact separation, allowing for flexible material selection and design, as the stationary yoke is not fixed to the base, thus avoiding heat-related issues and enhancing insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the yoke attraction force is increased to limit contact separation caused by contact point electromagnetic repulsion force, then the contact separation is limited, but the stationary yoke is attracted toward the movable yoke and the movable core moves apart from the stationary core, causing contacts to separate
Solution Approach 1:
The relay is divided into separate functional components: the stationary yoke is separated from the movable core assembly, with the stationary yoke fixed to the base and the movable core able to move independently. This segmentation allows the yoke attraction force to act on the stationary yoke without causing the movable core to separate from the stationary core.
Solution Approach 2:
The stationary yoke is merged with the base structure through fixed connection, creating a unified stationary assembly. This merging ensures that the stationary yoke remains fixed and does not move toward the movable yoke, allowing the yoke attraction force to be effectively utilized for limiting contact separation.
2Force
If the electromagnetic attraction force is increased to be larger than the yoke attraction force to prevent contact separation, then the contact separation is prevented, but the excitation coil becomes large in size
Solution Approach 1:
The invention changes the structural parameters of the relay by fixing the stationary yoke to the base, which fundamentally alters how the yoke attraction force is utilized. This parameter change allows the system to achieve effective contact separation control with reduced electromagnetic attraction force requirements, thereby reducing excitation coil size.
3Stability of the object's composition
If the stationary yoke is fixed to the base to prevent movement, then the contact separation is limited, but the contact room becomes high temperature and the bonding power may be insufficient
Solution Approach 1:
The base serves as an intermediary structure that provides thermal management and mechanical support. By fixing the stationary yoke to the base, the base acts as a heat sink and structural intermediary, allowing the stationary yoke to remain stable while the base manages the thermal environment of the contact room.
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 effectively limits contact separation without increasing the excitation coil size, reduces the need for high-temperature-resistant materials, and allows for increased flexibility in design and material selection, while ensuring electrical insulation and efficient heat management.
Implementation Method 1
an electromagnetic attraction force generated when the excitation coil 97 is energized. The movable core 90 is attracted toward a stationary core 98 by an electromagnetic attraction force
Implementation Method 2
a yoke attraction force is generated between the movable yoke 93 and the stationary yoke 94 by a magnetic flux flowing in the movable yoke 93 and the stationary yoke 94
Implementation Method 3
An electromagnetic repulsion force (hereinafter, this electromagnetic force is referred to as a contact point electromagnetic repulsion force) is generated at a contact point of the movable contact and the stationary contact by an electric current flowing in a reverse direction
Data Source
AI summary
An electromagnetic relay according to the present disclosure includes an excitation coil generating a magnetic field during energization, a movable core driven by the magnetic field generated by the excitation coil, a movable element including a movable contact and moving to follow the driven movable core, a plurality of stationary terminals each including a stationary contact that contacts the movable contact during the energization of the excitation coil, a stationary yoke formed of a magnetic material and supported by at least one of the plurality of stationary terminals, and a movable yoke formed of a magnetic material and arranged to face the stationary yoke, the movable yoke being in contact with the movable element and moving together with the movable element. Since the stationary yoke is supported by the stationary terminal, increase in temperature of the stationary terminal can be limited.