Segmented Insulation Sheet for Electric Machine Core Assembly
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Solution Overview
Problem
The installation and alignment of insulation wedges in electric machines can be difficult due to the size or geometry of the core, conductors, or windings, leading to challenges in providing effective insulation and maintaining the integrity of the winding arrangement.
Innovation Solution
An insulation sheet with spaced circumferential and axial members is positioned on the core to obstruct radial openings between teeth, facilitating easy assembly and providing high-integrity insulation across different winding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulation wedges are used to provide electrical insulation and maintain conductor position, then insulation integrity is improved, but assembly difficulty increases due to alignment challenges with core slots
Solution Approach 1:
The insulation component is divided into multiple axial members that can be independently positioned within individual core slots. Each axial member acts as a separate insulation element, allowing for easier alignment and installation while collectively providing comprehensive insulation coverage across all slots. This segmentation resolves the contradiction by making the assembly process simpler without compromising insulation integrity.
Solution Approach 2:
The insulation component serves as an intermediary element between the conductors and the core slots. The axial members are positioned within the slots to prevent direct contact between conductors and the core, while the circumferential members provide additional insulation barriers. This intermediary structure maintains reliable electrical insulation while facilitating easier assembly compared to traditional wedge-based systems.
2Reliability
If traditional insulation wedges are positioned in core slots, then electrical insulation is provided, but device complexity increases due to alignment and positioning requirements
Solution Approach 1:
The insulation system is segmented into multiple axial members distributed across different core slots, with circumferential members providing structural support. This segmentation eliminates the need for complex alignment of single-piece insulation wedges, as each axial member can be independently positioned within its respective slot. The overall device complexity is reduced while maintaining reliable electrical insulation.
Solution Approach 2:
Instead of positioning insulation wedges from the radial direction into the slots, the axial members are designed to be positioned within the slots from the end face of the core. This inverted approach to insulation component placement simplifies the positioning process and reduces alignment requirements, while still providing effective electrical insulation between conductors and the core.
3Reliability
If insulation components are added to maintain conductor position and prevent short-circuiting, then electrical reliability is improved, but manufacturing cost increases
Solution Approach 1:
The insulation component is designed to perform multiple functions simultaneously: axial members provide electrical insulation within slots, circumferential members provide additional insulation barriers, and the overall structure maintains conductor positioning. This multi-functionality reduces the need for separate insulation components, thereby lowering manufacturing costs while improving electrical reliability.
Solution Approach 2:
The insulation component merges the functions of traditional insulation wedges, slot liners, and conductor positioning elements into a single integrated structure. By combining these previously separate components into one unified insulation assembly, manufacturing complexity and cost are reduced, while electrical reliability is enhanced through comprehensive insulation coverage.
Data Source
AI summary
An electric machine includes a core with a plurality of teeth that extends between end faces of the core. Slots are defined in the core between adjacent teeth of the plurality of teeth. The slots each have a radial opening formed between end portions of the adjacent teeth. An insulation sheet is positioned on the core to obstruct the radial openings to the slots. The insulation has at least two spaced circumferential members that respectively overlap the end faces of the core. The insulation sheet also has a plurality of spaced axial members connected to the circumferential members. The axial members are positioned within the slots to obstruct the radial openings to the slots.