Electromagnetic Structure with Nested Yokes and Bistable Latching
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Solution Overview
Problem
Existing electromagnetic systems with permanent magnets face challenges in achieving highly efficient magnetic flux confinement, bistable magnetic latching, low energy consumption, and simple structure design, which affects product efficiency, homogeneity, and rejection rates.
Innovation Solution
The design includes a hollow cylindrical outer yoke, two groups of cylindrical permanent magnets, an inner yoke with a symmetrical C-shaped structure, and an armature with a connecting rod, allowing for bistable magnetic latching and flexible configuration, reducing power consumption and enhancing anti-vibration and anti-impact capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional electromagnetic structure is used, then the structure can perform basic switching operations, but the magnetic flux confinement is insufficient and energy consumption is high
Solution Approach 1:
The electromagnetic structure is segmented into distinct functional components: outer yoke, inner yoke, armature, and two groups of permanent magnets (first and second). This segmentation allows each component to be optimized for its specific function, improving magnetic flux confinement while maintaining manageable structural complexity. The permanent magnets are arranged in specific groups to create efficient magnetic pathways.
Solution Approach 2:
The inner yoke is nested within the outer yoke structure, creating a layered electromagnetic configuration. The armature is positioned within the inner yoke, and the permanent magnets are integrated at specific locations between these nested components. This nesting arrangement optimizes magnetic flux confinement by creating multiple magnetic pathways while maintaining a compact overall structure.
2Ease of manufacture
If the electromagnetic structure is simplified, then the assembly process becomes easier, but the magnetic flux confinement and bistable latching performance deteriorate
Solution Approach 1:
The yoke structure serves multiple functions simultaneously: it provides the magnetic flux pathway, supports the permanent magnets, and defines the mechanical boundaries for the armature. The outer and inner yokes work together to both confine magnetic flux and provide structural support, reducing the need for additional separate components and simplifying assembly while maintaining reliable magnetic confinement.
Solution Approach 2:
The first and second permanent magnet groups are combined with the yoke structures to form integrated magnetic assemblies. The permanent magnets are positioned to work together with the yoke and armature, creating a unified magnetic circuit that achieves reliable flux confinement through the combined action of all components rather than requiring complex individual elements.
3Stability of the object's composition
If permanent magnets are added to improve retention force, then the bistable latching performance improves, but the structure complexity and manufacturing difficulty increase
Solution Approach 1:
The electromagnetic structure uses asymmetric arrangement of permanent magnets: the first permanent magnet group is positioned at one location between the outer and inner yokes, while the second permanent magnet group is positioned at a different location. This asymmetric placement creates the necessary bistable latching behavior where the armature can stably rest in two different positions, achieving reliable retention force without requiring symmetric complexity throughout the entire 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
This design achieves efficient magnetic flux confinement, bistable latching, low energy consumption, and a simple structure, improving product assembly efficiency, homogeneity, and reducing rejection rates, while allowing for easy adjustment of magnetic force and reduced power usage.
Implementation Method 1
In a direct-acting relay containing a permanent magnet, the permanent magnet provides the retention force in a stable state
Implementation Method 2
the entire relay magnetic circuit consisted of a connecting coil core
Data Source
AI summary
An electromagnetic structure comprising permanent magnets comprises an outer yoke (a6), a first permanent magnet group (a3, a5), an inner yoke (a8), an armature (a1), and a second permanent magnet group (a2, a4). The outer yoke is in a hollow cylinder shape. The first permanent magnet group comprises multiple permanent magnets arrayed in a round shape, the multiple permanent magnets are connected to the outer yoke, and a magnetizing direction of each permanent magnet is along an axial direction. The inner yoke comprises an inner yoke upper base, an inner yoke sidewall, and an inner yoke lower base. The inner yoke upper base and the inner yoke lower base are separately extended outwards and horizontally from an upper end and a lower end of the inner yoke sidewall to form a circular ring. The armature comprises an armature upper base, an armature lower base, and an armature barrel body. The armature barrel body penetrates through the inner yoke sidewall, and the height of the armature barrel body is greater than that of the inner yoke. The armature upper base and the armature lower base are separately in a round shape with a diameter greater than an inner diameter of the inner yoke sidewall. The second permanent magnet group comprises multiple permanent magnets arrayed in a round shape, the multiple permanent magnets are connected to the outer yoke and the inner yoke, and a magnetizing direction of each permanent magnet is along an axial direction. The electromagnetic structure is low in power consumption of a coil, has a good shock resistance performance, and has a good capability against the centrifugal acceleration impact.