Electromagnetic Relay Demagnetization Coil for Faster Switching
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Solution Overview
Problem
Electromagnetic relays face issues with remanent magnetization of the mover, which affects the responsiveness of the relay in switching operations, as the mover remains magnetized even after the energized state of the first coil is canceled, leading to prolonged operation times and reduced reliability.
Innovation Solution
Incorporating a second coil that generates a magnetic flux opposite to that of the first coil, along with a demagnetization circuit using a series resonant circuit, to reduce remanent magnetization by alternately placing the mover in magnetic fields with opposite directions, thereby reducing the magnetic attractive force and facilitating faster switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first coil is used to generate magnetic flux for actuating the mover, then the moving contact can be switched from open to closed position, but remanent magnetization remains in the mover after the first coil is de-energized, causing delayed response and reduced reliability
Solution Approach 1:
The patent applies preliminary anti-action by introducing a second coil that generates magnetic flux in the opposite direction to the first coil's magnetic flux. This opposite magnetic flux is applied to the mover before the remanent magnetization can cause problematic effects, actively canceling out the residual magnetism and ensuring the mover returns to its neutral position without delay or sticking.
2Stability of the object's composition
If the mover remains magnetized after the first coil is de-energized, then the magnetic field persists to maintain contact, but this causes prolonged operation time and reduced switching speed
Solution Approach 1:
The patent implements periodic action by using the second coil to apply alternating magnetic flux in opposite directions to the mover. This periodic application of reverse magnetic flux effectively cancels the remanent magnetization at critical moments in the switching cycle, enabling rapid and clean transitions between open and closed positions without the拖拽 effect of persistent magnetism.
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
The solution effectively reduces remanent magnetization, enhancing the responsiveness and reliability of the electromagnetic relay by minimizing the impact of residual magnetism on the switching operations, allowing for quicker and more efficient transitions between open and closed states.
Implementation Method 1
The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil
Implementation Method 2
The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover
Implementation Method 3
the mover may still remain magnetized (i.e., may have remanent magnetization)
Data Source
AI summary
An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.