Interchangeable Stator End Caps with Rounded Wire Barriers
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Solution Overview
Problem
The winding process of stator cores in electric motors often faces challenges due to the presence of numerous structures near winding slots, leading to issues like wire catching, poor coil consistency, and increased time for corrective efforts, which conventional insulation methods fail to adequately address.
Innovation Solution
A set of interchangeably configurable end caps with varying axial skirt lengths is provided, which are fitted over the stator core to create a continuous axial extent, forming a wire barrier with rounded edges to guide wiring smoothly and eliminate the need for additional insulation, such as liners, thereby ensuring consistent insulation across varying axial stack heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation methods (end caps with liners) are used, then insulation coverage is provided, but wire catching occurs and coil consistency deteriorates
Solution Approach 1:
The patent removes the liner component from the insulation system, retaining only the end cap structure. This extraction eliminates the interface between liner and wire that causes catching, while the end cap alone provides sufficient insulation coverage for the active axial stack height
Solution Approach 2:
The end cap features a rounded distal end instead of a sharp edge, creating a smooth curved surface that guides wire during winding. This curvature prevents wire catching by eliminating abrupt transitions, while maintaining effective insulation coverage
2Reliability
If liners are added for additional insulation, then insulation completeness improves, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the insulation function into a single integrated end cap structure, eliminating the separate liner component. The end cap's axial extent is designed to provide complete insulation coverage for the active stack height, making additional liners redundant
Solution Approach 2:
The end cap serves multiple functions simultaneously: it provides electrical insulation, guides wire during winding through its rounded profile, and defines the active axial stack height. This multi-functionality eliminates the need for dedicated liner components
3Ease of manufacture
If end caps with fixed axial extent are used, then manufacturing is simplified, but adaptability to different axial stack heights is reduced
Solution Approach 1:
The patent varies the axial extent parameter of the end cap skirt to match different active axial stack heights. Each end cap is manufactured with a specific axial extent that corresponds to its intended application, providing optimal insulation coverage without requiring complex adjustable mechanisms
Data Source
AI summary
A set of interchangeably pairable end caps is provided for electrically insulating a variety of stator cores having differing axial stack heights. Each pair of end caps cooperatively defines a generally radially projecting, generally axially extending wire barrier including axially opposed ends. Each of the ends forms a respective rounded winding ramp configured to smoothly guide wiring into a wire trough in part defined by the wire barrier.