Laminated Core Adhesion Regions Aligned With Magnetic Flux
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Solution Overview
Problem
Conventional laminated cores have room for improvement in magnetic properties due to adhesive shrinkage causing strain and increased iron loss, which obstructs the magnetic flux.
Innovation Solution
A laminated core design with an adhesion region extending in the direction of magnetic flux, reducing the proportion of deterioration regions in the magnetic flux path and allowing the flux to bypass these regions, enhancing magnetic properties by strategically placing adhesion regions on the core back part and tooth parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to adhere electrical steel sheets, then adhesion strength is improved, but iron loss increases due to curing shrinkage strain
Solution Approach 1:
The adhesive is applied only to specific local regions (dented portions) of the electrical steel sheets rather than uniformly across the entire surface. This localized application provides sufficient adhesion strength while minimizing the total area subjected to curing shrinkage strain, thereby reducing overall iron loss in the laminated core.
Solution Approach 2:
Dented portions of the electrical steel sheets serve as intermediary structures that concentrate the adhesive application. These dented portions act as mediators between the adhesive and the flat sheet surfaces, providing effective bonding points while isolating most of the sheet area from the harmful effects of adhesive shrinkage.
2Strength
If adhesion area is increased to improve adhesion strength, then adhesion strength is improved, but the proportion of deterioration region in magnetic flux path increases
Solution Approach 1:
The adhesive is concentrated in specific local regions (dented portions) rather than distributed uniformly. This creates high adhesion strength at critical bonding points while keeping the total adhesion area small, thus minimizing the proportion of deterioration regions that would obstruct magnetic flux in the core back part.
3Strength
If adhesive is applied uniformly across the surface, then adhesion strength is improved, but manufacturing complexity increases
Solution Approach 1:
The adhesive application is segmented into discrete locations (dented portions) rather than continuous uniform application. This segmentation simplifies the manufacturing process by reducing adhesive material requirements and application time, while the dented portions are easily formed during the punching process for creating magnetic flux paths.
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 design improves magnetic properties by reducing iron loss and obstruction of magnetic flux, leading to enhanced performance of the laminated core and electric motor.
Implementation Method 1
Generally, the adhesive shrinks upon curing. Therefore, a strain due to the curing shrinkage of the adhesive occurs in the adhesion region
Implementation Method 2
a direction along a magnetic flux passing through a region of the electrical steel sheet in contact with the adhesion region
Data Source
AI summary
A laminated core includes a plurality of electrical steel sheets stacked on each other, and an adhesion part which is provided between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, in which the electrical steel sheet include an annular core back part, and a plurality of tooth parts which extend from the core back part in a radial direction of the core back part and are disposed at intervals in a circumferential direction of the core back part, an adhesion region in which the adhesion part is provided is formed in the core back part of the electrical steel sheet, and the adhesion region extends in a direction along a magnetic flux passing through a region of the electrical steel sheet in contact with the adhesion region.