Stator Coil Adhesive Segmentation for NV Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing stator designs for rotating electric machines, which use adhesive layers to integrate coils and insulating paper with the stator core, result in increased rigidity leading to deteriorated Noise Vibration (NV) properties.
Innovation Solution
A stator design where only a part of the coil of each phase is fixed to the stator core using an adhesive portion on the insulating paper, reducing the amount of adhesive material and preventing NV property deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive layers are provided over the entire area surrounding the coil in the slot, then the coil and stator core can be reliably integrated, but the rigidity of the stator increases and NV properties deteriorate
Solution Approach 1:
The adhesive layer is segmented into multiple discrete adhesive portions rather than being continuous. Each adhesive portion has a width of 0.5 to 2.0 mm and is spaced apart from adjacent adhesive portions, creating a discontinuous adhesive pattern that reduces overall rigidity while maintaining local bonding strength for reliable integration.
Solution Approach 2:
The adhesive portions are strategically positioned at specific locations within the slot where they contact the coil, rather than covering the entire slot width. This localized adhesive application provides sufficient bonding reliability at critical points while leaving other areas without adhesive to reduce the overall rigidity increase and improve NV properties.
2Strength
If adhesive material is applied over the entire slot surface, then strong bonding between coil and stator core is achieved, but the amount of adhesive material increases causing rigidity increase and NV deterioration
Solution Approach 1:
The adhesive material is divided into multiple discrete portions with widths of 0.5 to 2.0 mm each, spaced apart within the slot. This segmentation reduces the total quantity of adhesive material required compared to continuous coverage, while the distributed portions collectively provide sufficient bonding strength to hold the coil and stator core together.
Solution Approach 2:
Instead of applying adhesive over the entire slot surface (excessive action), the invention applies adhesive only at specific discrete locations (partial action). This partial application is sufficient to achieve the required bonding strength while significantly reducing the total amount of adhesive material used, thereby preventing excessive rigidity increase and NV deterioration.
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
This approach effectively integrates the coils and stator core while minimizing the adverse effects on NV properties by reducing the rigidity increase and the risk of adhesive peeling, thereby enhancing the machine's performance.
Implementation Method 1
the insulating paper includes an adhesive portion which fixes the coil to the stator core
Data Source
AI summary
A stator of a rotating electric machine includes a stator core provided with a plurality of slots along a circumferential direction, coils of a plurality of phases distributedly wound around the stator core via the plurality of slots, and an insulating paper disposed between the slot and the coil. The insulating paper has an adhesive portion which fixes the coil to the stator core and a part of the coil of each phase is fixed to the stator core by the adhesive portion.