Oriented Magnetic Composite Material for Low-Loss High-Frequency Motors
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Solution Overview
Problem
Current soft magnetic materials fail to simultaneously achieve high saturation magnetization, high magnetic permeability, low losses, high thermal stability, and excellent mechanical characteristics, especially at high frequencies and in complex shapes, which are essential for advanced rotating electric machines, power semiconductor devices, and high-frequency communication equipment.
Innovation Solution
A magnetic composite material comprising flaky magnetic particles with oriented principal surfaces and an intercalated phase, combined with a reinforcing material, which enhances mechanical strength and magnetic properties by optimizing the orientation and composition of the magnetic bodies and the intercalated phase to achieve anisotropic coercivity and reduced eddy current loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft magnetic materials are used to increase saturation magnetization and magnetic permeability, then the magnetic performance is improved, but the losses (eddy current loss, hysteresis loss, ferromagnetic resonance loss) increase
Solution Approach 1:
The magnetic material is divided into fine particles (average diameter 0.5-5 μm) and arranged in a composite structure with insulating matrices. This segmentation reduces eddy current paths and lowers eddy current loss while maintaining high saturation magnetization through the magnetic particle composition (Fe, Co, Ni, or their alloys).
Solution Approach 2:
The patent creates a composite material consisting of magnetic particles (providing high saturation magnetization) dispersed in an insulating matrix (reducing eddy current loss). The matrix material includes resins, ceramics, or glasses that electrically isolate the magnetic particles, thereby reducing energy losses while preserving magnetic performance.
2Volume of moving object
If the working frequency is increased to enable size reduction, then the equipment size is reduced, but the losses increase and magnetic permeability decreases at high frequency
Solution Approach 1:
The patent changes the physical parameters of the magnetic material by controlling particle size (0.5-5 μm), composition ratios, and microstructure to optimize high-frequency performance. This enables the material to maintain low losses and high magnetic permeability at frequencies up to several MHz, allowing equipment size reduction through high-frequency operation.
3Adaptability or versatility
If the material is processed into complex shapes for advanced applications, then the adaptability is improved, but the mechanical strength and thermal stability deteriorate
Solution Approach 1:
The patent applies different material properties to different regions: magnetic particles concentrated in areas requiring magnetic performance, insulating matrices in areas requiring mechanical strength and thermal stability. This local optimization allows complex shaped components to maintain both functional and mechanical requirements.
Solution Approach 2:
The composite structure combines magnetic particles with mechanically strong and thermally stable matrix materials (ceramics, glasses, or reinforced resins). This composite approach enables complex shaped components to achieve both magnetic functionality and mechanical robustness simultaneously.
4Loss of energy
If the electrical resistance is increased to reduce eddy current loss, then the eddy current loss is reduced, but the saturation magnetization decreases
Solution Approach 1:
The material is segmented into fine magnetic particles (0.5-5 μm) separated by insulating matrices. This segmentation increases electrical resistance between particles, reducing eddy current loss, while the high saturation magnetization is maintained through optimal magnetic particle composition (Fe, Co, Ni-based alloys) and sufficient particle concentration.
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 magnetic composite material exhibits improved magnetic permeability, reduced hysteresis loss, and enhanced mechanical strength, enabling efficient operation in high-frequency applications and complex shapes while maintaining low losses and high thermal stability.
Implementation Method 1
In order to make the eddy current loss small, it is effective to increase the electrical resistance, or decrease the sizes of metal parts, or finely divide the magnetic domain structure.
Implementation Method 2
In order to make the hysteresis loss small, it is effective to reduce coercivity or increase the saturation magnetization.
Implementation Method 3
In order to make the ferromagnetic resonance loss small, it is effective to make the ferromagnetic resonance frequency higher by increasing the anisotropic magnetic field of the material.
Data Source
AI summary
The magnetic composite material of the embodiments includes a magnetic material having a plane at the surface; and a plurality of fibrous materials. The magnetic material includes: a plurality of magnetic bodies having a planar structure, each of the magnetic bodies having a magnetic metal phase containing at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni), and principal surfaces; and an intercalated phase containing at least one second element selected from the group consisting of oxygen (O), carbon (C), nitrogen (N), and fluorine (F). The fibrous materials are oriented to be approximately perpendicular or approximately parallel to the principal surfaces and are provided in the intercalated phase. The principal surfaces are oriented to be approximately parallel to the plane and have the difference in coercivity on the basis of direction within the plane.