Amorphous Alloy Laminated Core Annealing for Lower Iron Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for magnetic field annealing of laminated cores with amorphous alloy thin strips do not sufficiently reduce iron loss due to differences in magnetic flux direction between the core back and teeth, limiting efficiency in rotating machines.
Innovation Solution
A laminated core design with annular thin pieces of Fe-based amorphous alloy, stacked in a specific orientation, and subjected to magnetic field annealing at controlled temperatures and magnetic fields to create a magnetic domain structure with controlled magnetic domains, reducing iron loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional magnetic field annealing methods are applied to laminated cores, then some iron loss reduction is achieved, but the iron loss cannot be sufficiently reduced due to different magnetic flux directions in core back and teeth
Solution Approach 1:
The patent applies different magnetic field directions to different regions of the laminated core: a first magnetic field in the radial direction for the core back, and a second magnetic field in the axial direction for the teeth. This local differentiation of magnetic field orientation matches the different magnetic flux directions in each region, enabling effective iron loss reduction throughout the entire core structure.
2Loss of energy
If a single magnetic field direction is applied during annealing, then the process is simple, but iron loss reduction is insufficient for regions with different magnetic flux orientations
Solution Approach 1:
The annealing process is segmented into region-specific treatments: the core back receives a first magnetic field in the radial direction, while the teeth receive a second magnetic field in the axial direction. This segmentation allows each region to be treated according to its specific magnetic flux characteristics, maximizing iron loss reduction while maintaining process feasibility.
Solution Approach 2:
The patent introduces multi-dimensional magnetic field orientation by applying magnetic fields in different spatial directions (radial for core back, axial for teeth) rather than a single uniform direction. This dimensional differentiation enables the annealing process to address the three-dimensional complexity of magnetic flux paths in the laminated core 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
The laminated core achieves significantly reduced iron loss, enhancing the efficiency of rotating machines by optimizing the magnetic domain structure and annealing process.
Implementation Method 1
performing annealing in a magnetic field of a laminated body including a plurality of annular thin pieces including an Fe-based amorphous alloy
Implementation Method 2
create a magnetic domain structure with controlled magnetic domains
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A laminated core includes a plurality of annular thin pieces being stacked in the thickness direction thereof and including an Fe-based amorphous alloy having an amorphous microstructure, and has a ratio (Wθ/Wr) of less than 1.0, the ratio (Wθ/Wr being the iron loss Wθ in the circumferential direction of the thin pieces to the iron loss Wr in the radial direction orthogonal to the circumferential direction and the thickness direction.