Electromagnetic Relay Permanent Magnet Flux Efficiency
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Solution Overview
Problem
Conventional electromagnetic devices face a reduction in attractive force due to inefficient magnetic flux flow from permanent magnets, which affects the movement of movable members towards fixed members.
Innovation Solution
Incorporating a permanent magnet between the opposed surfaces of the fixed and movable members, aligned to generate a second magnetic flux that enhances the attractive force by ensuring efficient flow through the magnetic pole faces, thereby improving the magnetic flux efficiency and attractive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a permanent magnet is located in the middle of the movable member in the reciprocation direction, then the device can be driven with smaller power consumption, but the amount of magnetic flux generated by the permanent magnet flowing through the opposed surface of the movable member decreases
Solution Approach 1:
The patent changes the position of the permanent magnet from the middle of the movable member to the opposed surface of the movable member, effectively moving it to a different spatial dimension. This repositioning allows the magnetic flux to flow more efficiently through the opposed surface, increasing the attractive force while maintaining the power consumption benefits.
Solution Approach 2:
The patent introduces a magnetic flux concentration structure (such as a magnetic pole piece or flux guide) as an intermediary between the permanent magnet and the opposed surface. This intermediary component directs and concentrates the magnetic flux, ensuring that maximum flux flows through the opposed surface, thereby enhancing the attractive force generated by the permanent magnet.
2Force
If the permanent magnet is positioned to generate maximum magnetic flux, then the attractive force is improved, but the efficiency of magnetic flux flow through the magnetic pole faces decreases
Solution Approach 1:
The patent applies local quality by creating a concentrated region of high magnetic flux density at the opposed surface where the permanent magnet is positioned. By localizing the magnetic flux generation at the critical interface (the opposed surface), the patent ensures that the magnetic flux is most intense where it is needed to generate attractive force, while avoiding unnecessary flux generation in other regions that would result in energy loss.
Solution Approach 2:
The patent changes the spatial parameters of the permanent magnet's position and orientation to optimize magnetic flux flow. Specifically, positioning the permanent magnet at the opposed surface and orienting its magnetized surface to face the fixed member creates optimal magnetic circuit conditions, maximizing both attractive force and flux efficiency simultaneously.
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 significantly enhances the attractive force acting on the movable member, allowing for smoother and more efficient movement towards the fixed member, improving the overall performance of the electromagnetic device and relay.
Implementation Method 1
a coil configured to generate a first magnetic flux when a current is applied thereto
Implementation Method 2
a permanent magnet configured to generate a second magnetic flux between opposed surfaces of the fixed member and the movable member
Data Source
AI summary
An electromagnetic device includes a fixed iron core through which a first magnetic flux flows, a movable iron core that reciprocates to separate from the fixed iron core by a predetermined gap when a current applied to a coil, which generates the first magnetic flux, is stopped and move to the fixed iron core by an attractive force when the current is applied to the coil. The electromagnetic device also includes a permanent magnet that generates a second magnetic flux. The opposed surface of the fixed iron core and the opposed surface of the movable iron core may be opposed in a reciprocating direction of the movable iron core. The permanent magnet may be attached to the fixed iron core such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the movable iron core.