Motor Armature Insulation Stability via Pre-installed Flange
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Solution Overview
Problem
Insulation issues between adjacent coils in motors arise due to the stripping of insulation films during winding and the subsequent movement of insulating paper sheets, leading to inadequate electrical insulation.
Innovation Solution
The design incorporates annular core-backs with circumferentially spaced teeth, insulator members with flange-shaped inner walls, and U-shaped, C-shaped, or S-shaped insulating sheets between coils, preventing the insulating sheets from moving towards the motor's center axis and ensuring radially spaced contactless opposition between adjacent insulator members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating paper sheet is inserted between windings of neighboring phases to secure inter-phase electric insulation, then electrical insulation between adjacent coils is improved, but the insulating paper sheet may move from the inner circumferential surface of the stator to the center axis of the motor, causing insulation to fail
Solution Approach 1:
The insulator members are pre-installed on the teeth before coil winding, creating a prepared structure that prevents insulating sheet movement during operation. The flange-shaped inner wall portions are positioned in advance to form contactless opposing relationships that will restrain the insulating sheets.
Solution Approach 2:
The insulator members act as intermediary structures between the stator teeth and the insulating sheets. These insulator members with flange-shaped inner wall portions create a mechanical restraint system that prevents the insulating sheets from moving toward the center axis, thereby maintaining insulation reliability.
2Reliability
If insulator members are designed with flange-shaped inner wall portions in radially spaced-apart contactless relationship, then movement of insulating sheets is prevented, but the structure becomes more complex
Solution Approach 1:
The insulator members are segmented into distinct functional portions: the main body portion that covers the tooth and the flange-shaped inner wall portion that extends radially inward. This segmentation allows each portion to perform its specific function independently while maintaining overall structural integrity.
Solution Approach 2:
The flange-shaped inner wall portions are strategically positioned only where needed to prevent insulating sheet movement, specifically at the radially inner side of the insulator members. This localized structural feature adds complexity only where necessary to solve the insulation stability problem.
Data Source
AI summary
An armature includes a core-back, insulator members, coils and insulating sheets. The insulating sheets are arranged between the coils adjacent to one another. Each of the insulator members includes a flange-shaped inner wall portion positioned radially inwards of each of the insulating sheets. The inner wall portions of the insulator members adjacent to each other include opposing portions opposed to each other in a radially spaced-apart contactless relationship.