Polarized Electromagnetic Trip Unit With Offset Pivot for Stable Torque
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Solution Overview
Problem
Existing electromagnetic trip units for electrical protection equipment are bulky and complex to manufacture, compromising compactness and stability, while existing solutions that enhance compactness compromise stability and industrial efficiency.
Innovation Solution
A compact electromagnetic trip unit design featuring a single armature piece with a non-magnetic pivot joint offset from the polar faces, reinforced by an additional magnetic section, and magnetic flux redirection, which simplifies assembly and enhances stability and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single armature piece is used with a non-magnetic pivot joint offset from the polar faces, then compactness and manufacturing simplicity are improved, but torque stability may be compromised
Solution Approach 1:
The pivot point is positioned in a third dimension (offset from the polar faces along the D3 direction) rather than being confined to the plane of the polar faces. This spatial repositioning allows the pivot joint to be located at an optimal distance from the magnetic flux path, reducing its interference with the magnetic field while maintaining mechanical stability and torque characteristics
Solution Approach 2:
A non-magnetic pivot joint serves as an intermediary element between the armature and the external mounting structure. This intermediary component isolates the magnetic circuit from mechanical mounting requirements, allowing the pivot joint to be positioned optimally without disrupting the magnetic flux path between the polar faces and the movable paddle
2Volume of moving object
If the pivot joint is offset from the first arm, then compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The design allows for parameter variations in the pivot joint position along the D3 direction (offset distance from the polar faces) without fundamentally affecting the operational principle. This parameter flexibility enables manufacturing tolerances to be managed within acceptable ranges while still achieving the compactness goals of the invention
3Reliability
If magnetic flux is redirected through an additional magnetic section, then torque stability is improved, but device complexity increases
Solution Approach 1:
The additional magnetic section is merged with the existing armature structure to form an integrated magnetic circuit. This magnetic section extends the magnetic path in a way that reinforces the flux distribution, improving torque stability while avoiding the need for separate, independently assembled magnetic components
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 design achieves a more compact and robust electromagnetic trip unit with improved industrial efficiency, increased torque stability, and reduced volume, while maintaining high sensitivity and stability under shock and vibration.
Implementation Method 1
an electromagnetic trip unit comprises at least: a coil (1), an armature (2), preferably of magnetic material
Implementation Method 2
a magnet (8) associated with said armature (2)... a movable pallet (9) mounted pivotally relative to the single armature piece (3)
Implementation Method 3
a magnet (8) associated with said armature (2), a movable pallet (9) mounted pivotally
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to an electromagnetic trigger comprising a coil (1), an armature (2), comprising a single piece of armature (3) having a first polar face (4) and a second polar face (5) and having a U shape, a magnet (8), a movable paddle (9) mounted pivotally relative to the single piece of armature (3) at the level of a pivot joint (10) around a pivot point, a return element (11) having a first end (12) coupled to the armature (2) and a second end (13) coupled to the movable paddle (9), characterized in that the pivot joint (10) made of non-magnetic material is fixed to the first arm (6) of the single piece of armature (3) and is offset relative to the first arm (6) so that the pivot point is at a distance from the first and second polar faces (4, 5).