Single Star Winding Arrangement for Rotating Electrical Machine
Solution Overview
Problem
Single star-connected rotating electrical machines face insulation challenges at high potentials due to maximum potential differences between adjacent coils, leading to increased manufacturing costs and reduced production efficiency when trying to miniaturize, as they require more leads and higher coil end heights compared to double star connections.
Innovation Solution
A winding arrangement for single star connections where the first and last coils are strategically placed in skipped coil arranging parts to maintain them apart, reducing the maximum potential difference and enhancing insulation performance without increasing the number of leads or coil end height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single star connection is used with conventional winding arrangement, then the number of leads is reduced and manufacturing cost is lowered, but insulation performance deteriorates due to maximum potential difference between adjacent coils
Solution Approach 1:
The winding arrangement is segmented into multiple coil arranging parts (first, second, third, and fourth coil arranging parts). By distributing coils across these segmented parts and strategically placing the first and last coils in non-adjacent parts, the potential difference problem is resolved while maintaining single star connection simplicity.
Solution Approach 2:
The invention transitions from a linear sequential arrangement to a multi-dimensional spatial distribution across four distinct coil arranging parts. The first and last coils are placed in different spatial dimensions (non-adjacent parts), eliminating the maximum potential difference issue without requiring additional leads.
2Reliability
If a double star connection is used to improve insulation performance, then insulation between coils is secured, but the number of leads increases and manufacturing complexity rises
Solution Approach 1:
Instead of increasing the number of leads (double star connection) to solve the insulation problem, the invention inverts the approach by rearranging the spatial positions of coils within the single star connection. The first and last coils are placed in non-adjacent coil arranging parts, achieving insulation performance improvement without increasing lead count.
3Ease of manufacture
If coils are arranged sequentially without skipping parts, then winding process is simplified, but first and last coils become adjacent causing insulation issues
Solution Approach 1:
The winding process intentionally skips the third coil arranging part when placing the last coil. Instead of sequentially filling all parts, the arrangement jumps from the second coil arranging part to the fourth, ensuring the first and last coils are separated. This skipping mechanism resolves the insulation problem while maintaining manufacturing efficiency.
Data Source
AI summary
The present invention is intended to provide a winding arrangement of single star connection for a rotating electrical machine, capable of enhancing insulation performance in coils of the same phase. In such winding arrangement, a first coil U1 to a sixth coil U6 are formed respectively in coil arranging parts 1U to 6U. Next, a coil arranging part 7U is skipped and the seventh coil U7 is formed in a coil arranging part 8U. Then, a coil formed at the end of winding (eighth coil U8) is formed in the skipped coil arranging part 7U.