Stator Segment Coil Layout for Easier Three-Phase Lead Routing
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Solution Overview
Problem
Existing rotary electric machines face challenges in arranging three-phase output lines from the connection side coil end, requiring complex structural changes and complicating the assembly process.
Innovation Solution
The implementation of segment coils with connection-side and non-connection-side winding portions, where the connection-side winding portions are arranged with a single slot pitch and the non-connection-side winding portions are inserted with multiple slot pitches, allowing for a twisting process that simplifies the assembly by using untwisted segment coils with various slot pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If three-phase output lines are arranged in the connection side coil end, then the rotary electric machine can be stored within a determined range, but the structure needs to be changed considerably and the assembly process becomes complicated
Solution Approach 1:
The coil end is divided into connection-side and non-connection-side portions, with different slot pitch arrangements for each segment. This segmentation allows the connection-side to have simplified single slot pitch for easier assembly while the non-connection-side accommodates multiple slot pitches for compact storage
Solution Approach 2:
Different regions of the coil end are assigned different properties: the connection-side has uniform slot pitch for simplified assembly, while the non-connection-side has varied slot pitches for compact arrangement. This local differentiation resolves the contradiction between assembly simplicity and storage compactness
2Adaptability or versatility
If coils are arranged with multiple slot pitches at the connection side coil end, then the non-connection side can accommodate various slot pitches, but the twisting process becomes complex and assembly is difficult
Solution Approach 1:
The winding is segmented into connection-side and non-connection-side portions with distinct slot pitch characteristics. The connection-side uses single slot pitch for easy twisting, while the non-connection-side uses multiple slot pitches for versatility
Solution Approach 2:
Instead of applying multiple slot pitches throughout the entire coil end (which would complicate twisting), the invention inverts the approach by applying multiple slot pitches only where needed (non-connection-side) and single slot pitch where twisting is required (connection-side)
Data Source
AI summary
Provided is a rotary electric machine which is configured to draw three-phase output lines from a connection side coil end by an easy process. A stator for a rotary electric machine according to the present invention includes a plurality of segment coils including connection-side winding portions and non-connection-side winding portions. The connection-side winding portions are arranged on one side of a stator core and connected to slots with the same slot pitch, and the non-connection-side winding portions are arranged on the other side of the stator core and inserted into the slots with a plurality of kinds of slot pitches. The connection-side winding portions include a first connection group and a second connection group. The first connection group is provided with a plurality of terminal portions for connecting the segments, and the second connection group connects layers different from those in the first connection group, and is provided with a plurality of terminal portions.