Stator Insulator Protrusion for Varnish Control
Solution Overview
Problem
Conventional synchronous motors face challenges in precise positioning during installation due to excess varnish running down and attaching to the end surface of the core, leading to balance issues and potential inclination during the drying process.
Innovation Solution
The stator design features a protrusion on its outer surface that extends radially across the entire circumference, creating a gap or groove to prevent excess varnish from reaching the core, ensuring it drops away from the core's surface during both upright and horizontal drying processes, thus maintaining balance and enabling precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If varnish is applied to the stator and the stator is placed upright for drying, then the varnish drying process can be completed, but excess varnish runs down and attaches to the end surface of the core causing balance issues
Solution Approach 1:
The protrusion on the insulator acts as an intermediary barrier between the varnish and the core end surface. It intercepts the running varnish and causes it to drop off before reaching the core, thus protecting the core from varnish attachment while maintaining the upright drying position.
Solution Approach 2:
The harmful effect of varnish running down is extracted and isolated by the protrusion structure. The varnish is diverted away from the core end surface at an intermediate point, removing the source of the balancing problem while preserving the drying process.
2Shape
If the stator is placed horizontally for drying, then varnish can be applied evenly, but excess varnish still reaches and attaches to the end surface of the core
Solution Approach 1:
The protrusion serves as a protective intermediary that blocks varnish from reaching the core end surface during horizontal drying. It creates a physical barrier that prevents direct contact between the running varnish and the core, ensuring precise positioning is maintained.
3Ease of manufacture
If varnish is wiped before drying, then some excess varnish is removed, but varnish still runs down and attaches to the end surface during drying
Solution Approach 1:
The protrusion is pre-positioned on the insulator before varnish application. It is ready in advance to intercept and divert any varnish that might run down during the drying process, providing proactive protection rather than requiring post-drying correction.
Data Source
AI summary
A stator includes a core and an insulator. The core has a plurality of annularly arranged tooth portions. The insulator is disposed on an end portion of the core, and has an annular wall portion extending in a direction departing from the core. A protrusion protrudes radially outward across an entire circumference of the wall portion, and the protrusion is provided on an outer circumferential surface of the wall portion.