Coil Bobbin Protrusions Guide Movable Core Movement
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Solution Overview
Problem
Conventional electromagnetic devices experience increased wear and friction due to movable core movement, leading to reduced device life and instability, as well as issues with coating exfoliation and oil deterioration causing the core and coil bobbin to stick.
Innovation Solution
A coil bobbin with a cylindrical hollow portion and protrusions on its inner surface, supporting the movable core and reducing wear debris by guiding its movement and preventing contact with the coil bobbin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating made from rigid polyvinyl chloride resin is applied to the movable core, then movability is improved, but the coating exfoliates during operation causing wear debris to increase
Solution Approach 1:
The patent introduces protrusions on the coil bobbin as an intermediary structure that supports the movable core during movement. This mediator prevents direct contact between the movable core and the coil bobbin inner surface, thereby reducing wear and preventing coating exfoliation while maintaining smooth operation.
Solution Approach 2:
The protrusions are pre-formed on the coil bobbin to provide protective support points before the movable core begins its movement. This beforehand cushioning prevents excessive friction and contact pressure that would otherwise cause the coating to exfoliate and generate wear debris.
2Ease of operation
If the movable core is provided with an irregular surface to create oil reservoirs, then movability is improved, but oil deterioration causes the core and coil bobbin to stick
Solution Approach 1:
The protrusions serve as an intermediary support structure that reduces direct contact between the movable core and coil bobbin. This minimizes the reliance on oil reservoirs and reduces the harmful effects of oil deterioration, preventing sticking while maintaining movability.
3Device complexity
If the movable core moves freely through the coil bobbin, then operation is simple, but friction increases and device life is reduced
Solution Approach 1:
The inner surface of the coil bobbin is segmented into multiple protrusions rather than being a continuous smooth surface. This segmentation creates discrete support points that guide the movable core through the coil bobbin, reducing friction and wear while maintaining operational simplicity.
Solution Approach 2:
The protrusions act as intermediary elements that facilitate the movement of the movable core through the coil bobbin. They provide structured support that reduces direct friction between the core and bobbin surfaces, thereby extending device life without complicating the overall structure.
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 protrusions reduce wear and improve movability of the movable core, enhancing the stability and longevity of the electromagnetic device by minimizing friction and wear debris accumulation.
Implementation Method 1
an electromagnetic device that moves a movable core due to magnetic force generated by energization of the coil
Data Source
AI summary
The electromagnetic device includes a coil bobbin around which a coil is wound and that is formed from a non-magnetic material, and a movable core that is provided in a cylindrical hollow portion of the coil bobbin and moves by excitation of the coil. A first protrusion and a second protrusion facing a part of the lower half of the movable core are formed on the inner peripheral surface of the cylindrical hollow portion in ranges extending from two openings to a middle point of the coil bobbin, respectively, and the movable core is supported by the first protrusion and the second protrusion when the movable core moves.