Electromagnetic Device Supporting Posts Prevent Iron Core Tilting
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Solution Overview
Problem
Switching devices using electromagnetic devices face issues with maintenance due to wear of components, and in devices without latch mechanisms, tilting of iron cores leads to variations in attraction force, requiring larger permanent magnets to maintain retention states.
Innovation Solution
The electromagnetic device features supporting posts on both sides of the fixed iron core to restrict the movable iron core's position, preventing tilting and stabilizing the attraction force, thus reducing the size and cost of the device while maintaining consistent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch mechanism is used to maintain closing state, then reliability is improved, but device complexity increases and maintenance is required due to wear
Solution Approach 1:
The patent removes the latch mechanism entirely from the system and replaces it with a permanent magnet-based retention system. The permanent magnet maintains the closing state through magnetic attraction force alone, eliminating mechanical wear components and simplifying the overall device structure while maintaining reliability.
Solution Approach 2:
The patent substitutes the mechanical latch mechanism with a magnetic field-based retention system. The permanent magnet creates magnetic attraction force that holds the movable iron core in the closed position, replacing mechanical interlocking with electromagnetic force, thereby reducing mechanical wear and device complexity.
2Device complexity
If bearing support is performed at a single point, then device complexity is reduced, but manufacturing precision deteriorates due to tilting of iron cores
Solution Approach 1:
The patent transitions from single-point bearing support to multi-point support by providing bearings at both ends of the movable shaft. This dimensional expansion from one support point to two support points creates a more stable structural framework that prevents tilting and maintains precise alignment of the iron core facing surfaces.
Solution Approach 2:
The patent divides the bearing support function into two separate bearing locations along the movable shaft - one at each end. This segmentation of the support system distributes the load and provides better structural stability, preventing the iron core from tilting while maintaining manufacturing precision without excessive complexity.
3Reliability
If permanent magnet size is increased to compensate for tilting variation, then attraction force stability is improved, but device volume increases
Solution Approach 1:
By adding bearing support at both ends of the movable shaft, the patent creates a two-point support system that eliminates tilting variation. This structural modification in the support dimension stabilizes the iron core alignment, allowing the permanent magnet to maintain consistent attraction force without needing to increase in size, thus avoiding volume increase.
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 reduces the volume and cost of the electromagnetic device, stabilizes the attraction force, and enhances the operating characteristics of the switching device by minimizing variations in tilting and attraction force.
Implementation Method 1
a permanent magnet which retains the movable iron core at the advanced position
Implementation Method 2
an electromagnetic coil provided in the fixed iron core
Data Source
AI summary
An electromagnetic device includes: a fixed iron core (7); a movable iron core (8) which is disposed to face the fixed iron core (7) and to which a drive shaft (9) is fixed, whereby the movable iron core (8) is displaceable in an axis line direction of the drive shaft (9) between a retreated position and an advanced position; an electromagnetic coil (10); a permanent magnet (11) which retains the movable iron core (8) at the advanced position; supporting posts (12) which are provided parallel to the axis line direction on both side surfaces of the fixed iron core (7) and support the fixed iron core (7); an opening-side plate (13) which is provided at one end portion of the supporting post (12) in a longitudinal direction and in which the drive shaft (9) passes therethrough and is supported; and a closing-side plate (14) which is provided at the other end portion of the supporting post (12) in the longitudinal direction and in which the drive shaft (9) passes therethrough and is supported, wherein the advanced position of the movable iron core (8) is restricted by the fixed iron core (7) and the retreated position is restricted by the opening-side plate (13).