Slot Liner With Overlapping Tabs For Motor Core Insulation
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Solution Overview
Problem
Electro-dynamic machines face challenges in ensuring proper insulation between conductive core windings and laminations, and in preventing damage during the radial insertion of core windings.
Innovation Solution
The use of slot liners with sidewalls, first and second tabs, and a retainer to line the circumferential surfaces of teeth and secure against the radially inward portion of the core, providing additional insulation and resisting damage during winding insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional insulation is provided on the surfaces of the core slots, then insulation effectiveness is improved, but device complexity increases
Solution Approach 1:
The slot liner is divided into multiple functional segments: sidewalls for lining the slot, first tabs for overlapping with adjacent liners, second tabs for engagement, and retainers for securing. This segmentation allows each part to perform its specific function efficiently while maintaining overall insulation effectiveness without excessive complexity.
Solution Approach 2:
The slot liner is inserted into the core slot and nested within the stator assembly structure. The liner fits within the existing core geometry, and multiple liners are nested along the circumferential direction with their tabs overlapping, creating a compact insulated structure without adding external complexity.
2Reliability
If slot liners are used to provide insulation, then insulation effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The slot liner serves multiple functions simultaneously: it provides electrical insulation between conductive elements and the core, mechanically secures the conductive elements during insertion, and interlocks with adjacent liners through tab engagement. This multi-functionality reduces the need for separate insulation components, simplifying the overall manufacturing process.
Solution Approach 2:
The slot liners are pre-formed with integrated tabs and retainers before insertion into the core. This preliminary formation of the insulation structure with built-in securing features eliminates the need for separate insulation application steps and simplifies the assembly process, as the liners are ready-to-install units that perform multiple functions upon insertion.
3Reliability
If conductive elements include insulation, then insulation is provided, but additional insulation on core slot surfaces is still required
Solution Approach 1:
The slot liner is installed beforehand on the core slot surfaces to provide a protective insulating layer. This pre-installed insulation cushioning protects the conductive elements during the radial insertion process and provides continuous insulation along the slot, supplementing the insulation already present on the conductive elements themselves.
Solution Approach 2:
The slot liner acts as an intermediary insulating layer between the conductive elements and the metallic core. Rather than relying solely on the insulation attached to the conductive elements, the slot liner provides an additional mediating barrier that ensures electrical isolation, particularly at critical interfaces where conductive elements contact the core or during dynamic insertion operations.
Data Source
AI summary
A slot liner is configured for association with a tooth of an electro-dynamic machine core having an annular rim and circumferentially spaced teeth radially extending from the annular rim. The slot liner includes sidewalls configured to line circumferential surfaces of the tooth, first and second tabs formed by bends in the sidewalls, the first tab being configured to line a portion of the annular rim adjacent to the tooth and the second tab being configured to overlap with a tab of an adjacent slot liner and a retainer configured to retain the sidewalls against a radially inward portion of the tooth.