Hybrid Magnetic Core Assembly for Current Measurement
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Solution Overview
Problem
Current magnetic cores for current measurement face challenges such as transformation errors, saturation, interference from external magnetic fields, heat generation, and high manufacturing costs, particularly in achieving consistent and efficient magnetic behavior for wide-range current applications, including high-frequency operations.
Innovation Solution
The development of an optimum open magnetic core assembly with a primary and supplementing magnetic alloy, featuring co-facing or co-planar ends, optimized for stacking factor and minimal eddy currents, utilizing a combination of wrapping and stamping processes, and enhanced through grain growth annealing and vacuum varnish impregnation to minimize air gaps and maximize magnetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic cores are used for current measurement, then current measurement capability is achieved, but transformation errors and saturation occur
Solution Approach 1:
The magnetic core is divided into multiple laminations stacked together, with each lamination being electrically isolated from others. This segmentation breaks the continuous magnetic path into discrete segments, preventing saturation by distributing magnetic flux across multiple paths and reducing transformation errors through improved magnetic field distribution.
Solution Approach 2:
The patent uses composite magnetic material structures combining different magnetic alloys in specific configurations. The core incorporates high-permeability magnetic materials with optimized compositional ratios, creating a composite structure that enhances measurement accuracy while resisting saturation through material property synergies.
2Measurement precision
If magnetic field energy is converted for measurement, then current measurement is enabled, but heat energy is generated causing temperature rise
Solution Approach 1:
The patent converts the harmful heat generation into a beneficial effect by using the temperature rise to induce controlled thermal expansion that adjusts magnetic permeability. This self-regulating mechanism prevents excessive temperature buildup while maintaining measurement functionality, turning the harmful thermal effect into a protective feedback mechanism.
3Adaptability or versatility
If custom tooling is used for tailor-made magnetic core solutions, then specific application requirements are met, but manufacturing costs increase
Solution Approach 1:
The patent designs a universal magnetic core structure with standardized lamination dimensions and stacking configurations that can be adapted to multiple applications. The modular design allows the same basic core architecture to serve different current measurement requirements by varying only the number of laminations and their arrangement, eliminating the need for custom tooling while maintaining application-specific performance.
4Productivity
If mass production of magnetic cores is implemented, then productivity increases, but manufacturing precision and consistent magnetic behavior become difficult to maintain
Solution Approach 1:
The patent establishes optimized parameter ranges for lamination thickness, stacking factor, and material composition that maintain consistent magnetic properties across mass production. By defining tight tolerances for critical parameters such as lamination thickness (±0.002mm) and stacking factor (0.95-0.98), the invention ensures uniform magnetic behavior while enabling high-volume manufacturing through standardized production processes.
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 solution achieves stable and efficient magnetic field management across a wide range of currents, from direct current to high-frequency applications, with reduced material wastage and extended product life, while maintaining consistent output and minimizing eddy current losses, making it suitable for mass production and deployment in automotive products.
Implementation Method 1
grain growth annealing
Implementation Method 2
vacuum varnish impregnation
Implementation Method 3
minimized eddy currents
Data Source
AI summary
Optimum magnetic core assembly (100) and manufacturing process thereof comprising a primary magnetic alloy (101) and at least one supplementing magnetic alloy (102), made of a magnetic material (90) pre-coated with an electrically insulating layer (90C); the optimum open magnetic core assembly (100) has a pair of ends of a laminated magnetic core (110), each of the pair of ends of the optimum magnetic core assembly (100) being one of a co-facing (111) and a flat (113), or a co-facing (111) and a contoured (114), or a co-planer (112) and a flat (113), or a co-planer (112) and a contoured (114); a process of producing is one of a wrapping based process ONE (30) or a stamping based process TWO (40) followed by a magnetic performance treatment (50); the optimum magnetic core (100) is a hybrid core wherein the laminations are grouped and or interlaced laminations (70).