Stator Winding Neutral Line Crawling Structure for Coil End Height Reduction
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Solution Overview
Problem
Existing electric rotating machines with lowered coil ends face challenges in minimizing the height of welding portions, leading to increased height and difficulty in achieving a low coil end.
Innovation Solution
The implementation of a crawling structure for neutral and output lines with an axial stepped portion and acute-angle folded and bent portions, allowing the output line to slip under the neutral line, reducing the coil end height and eliminating the need for additional fixation threads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection portions of neutral lines are extended axially and then welded, then electrical connection is achieved, but the height of the welding portion of coils increases
Solution Approach 1:
The neutral line connection is transitioned from an axial arrangement to a radial arrangement. The neutral lines are extended in the radial direction and connected at the radial end face of the stator core, eliminating the need for axial extension and welding. This dimensional change resolves the contradiction by achieving reliable electrical connection without increasing the axial height of the coil end.
Solution Approach 2:
Instead of extending neutral lines axially and welding them at the axial end, the patent inverts the approach by extending neutral lines radially and connecting them at the radial end face. This inversion of the connection direction eliminates the welding height issue while maintaining electrical connectivity.
2Stability of the object's composition
If neutral lines are connected with additional fixation threads, then connection stability is improved, but device complexity increases
Solution Approach 1:
The neutral lines are positioned and fixed within groove structures formed on the radial end face of the stator core. The grooves provide self-fixation for the neutral lines through their geometric constraints, eliminating the need for additional fixation threads or external fastening elements. This self-service mechanism achieves connection stability without increasing device complexity.
Solution Approach 2:
The fixation function is merged with the structural design of the stator core itself. The groove structures are integrated into the radial end face, combining the support and fixation functions into the core component, thereby eliminating separate fixation elements and reducing overall complexity.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A stator in which the height of a coil end of a stator winding can be lowered is provided, and an electric rotating machine including such a stator is provided. In a stator (100) of an electric rotating machine (3) including a stator winding including neutral lines (300a, 300b) and output lines (108U1 to 108W2), the neutral lines (300a, 300b) are configured to include a crawling portion extending circumferentially in the upper portion of a coil at the coil end (13), and the crawling portion includes an axial stepped portion. The output lines (108U1 to 108W2) are configured to pass under the axial stepped portion in at least one location of three phases.