Laminated Core Adhesion Orientation for Lower Iron Loss
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Solution Overview
Problem
Conventional laminated cores have room for improvement in enhancing magnetic properties, primarily due to increased iron loss caused by adhesive shrinkage and resulting strain, which obstructs the magnetic flux.
Innovation Solution
A laminated core design featuring electrical steel sheets with an annular core back part and tooth parts, where the adhesion region extends in a direction coinciding with the magnetic flux, reducing the proportion of deterioration regions in the magnetic flux path and allowing the flux to bypass these regions, thereby enhancing magnetic properties.
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 adhesive shrinkage strain
Solution Approach 1:
The patent applies adhesive only in specific local regions (dendrite regions) rather than uniformly across the entire electrical steel sheet surface. This localized adhesion approach maintains sufficient bonding strength while minimizing the total area subjected to shrinkage strain, thereby reducing overall iron loss in the laminated core.
Solution Approach 2:
The patent strategically places adhesive in dendrite regions where magnetic flux density is already low. By converting the potentially harmful shrinkage strain effect into a beneficial arrangement, the adhesive locations are chosen to minimize disruption to magnetic flux paths, thus reducing iron loss while maintaining adhesion.
2Strength
If adhesive shrinkage strain occurs in adhesion region, then adhesion is achieved, but magnetic flux obstruction increases
Solution Approach 1:
The patent concentrates adhesive application in specific dendrite regions rather than distributing it uniformly. This creates localized adhesion zones that generate minimal magnetic flux obstruction, while the majority of the magnetic flux path remains free from adhesive-induced strain and obstruction.
Solution Approach 2:
The dendrite regions serve as intermediary zones where adhesive is placed. These regions act as buffers that can accommodate adhesive shrinkage without significantly impacting the main magnetic flux paths, thus mediating between the need for adhesion and the need to maintain magnetic flux flow.
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 effectively reduces iron loss and improves magnetic properties by minimizing the obstruction of magnetic flux, leading to enhanced performance of the laminated core and electric motors.
Implementation Method 1
Generally, the adhesive shrinks upon curing
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
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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.