Magnetic Core Alignment Structure for Ferrite Tolerance Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic cores for inductive components, such as chokes and transformers, face production-induced tolerances that lead to asymmetry and mechanical instability, affecting inductive and mechanical properties, making it difficult to achieve desired properties and miniaturization.
Innovation Solution
A core body with an alignment structure featuring a crossbar and core legs, including an alignment recess on the rear surface, allows for symmetrical alignment and compensation of production tolerances, reducing leakage fluxes and enhancing mechanical stability through precise alignment during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sintered ferrite core bodies are assembled to form magnetic cores, then production is feasible and components can be manufactured, but production-induced tolerances of +/â2.5% per core body result in cumulative tolerances of +/â5% for assembled cores, affecting inductive properties and mechanical stability
Solution Approach 1:
The patent applies asymmetry by designing the first core body with an asymmetric cross-sectional shape that does not mirror the second core body. This asymmetric design, combined with specifically positioned contact faces, allows the assembly to compensate for production tolerances by creating a geometric configuration where tolerance variations do not directly translate to asymmetric leg offsets, thereby resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the core bodies with specifically positioned and oriented contact faces before assembly. The first core body is designed with contact faces at predetermined positions and orientations that will accommodate the second core body in a specific orientation. This preliminary configuration ensures that when the core bodies are assembled, the contact faces align properly despite production tolerances, preventing offset sections and ensuring flush coupling without requiring post-assembly adjustment.
2Productivity
If core bodies with tolerance-induced deviations are assembled, then production can proceed with standard tolerances, but offset sections on contact faces prevent flush coupling, leading to asymmetric legs and varying magnetic resistance
Solution Approach 1:
The patent implements preliminary action by pre-configuring the core bodies with specifically positioned and oriented contact faces before assembly. The first core body is designed with contact faces at predetermined positions and orientations that will accommodate the second core body in a specific orientation. This preliminary configuration ensures that when the core bodies are assembled, the contact faces align properly despite production tolerances, preventing offset sections and ensuring flush coupling without requiring post-assembly adjustment.
Solution Approach 2:
The patent applies parameter changes by modifying the geometric parameters of the core bodies, specifically the positions and orientations of contact faces. The first core body is designed with contact faces at specific positions and orientations that differ from conventional symmetric designs. This parameter modification allows the assembly to tolerate dimensional variations while maintaining proper alignment, thereby ensuring consistent inductive properties without compromising productivity.
3Ease of operation
If core bodies are aligned using stop faces during gluing, then assembly can be performed, but offset increases with distance from the stop face, causing strong asymmetry in legs and different magnetic resistance values
Solution Approach 1:
The patent implements preliminary action by pre-configuring the core bodies with specifically positioned and oriented contact faces before assembly. The first core body is designed with contact faces at predetermined positions and orientations that will accommodate the second core body in a specific orientation. This preliminary configuration ensures that when the core bodies are assembled, the contact faces align properly despite production tolerances, preventing offset sections and ensuring flush coupling without requiring post-assembly adjustment.
Solution Approach 2:
The patent applies segmentation by dividing the alignment function into multiple elements: the first contact face on the first core body, the second contact face on the second core body, and the specific orientation relationship between them. This segmentation of the alignment function allows each contact face to be precisely positioned and oriented independently, ensuring that the assembly as a whole achieves proper alignment without relying on a single stop face, thereby maintaining both ease of operation and manufacturing precision.
Data Source
AI summary
Core bodies which have an alignment structure and allow an alignment during the production of magnetic cores irrespective of production tolerances, in which the production tolerances are compensated. In illustrative embodiments a core body of ferromagnetic material comprises a crossbar having an aspect ratio of length to width greater than 1, and at least one core leg extending laterally away from the crossbar along an extension direction. An alignment recess is formed in a rear surface of the crossbar, which is arranged on a side of the crossbar opposite the core legs. A magnetic core is formed of core bodies, whereby at least one core body is provided with an alignment recess, and the core bodies are aligned relative to one another.