Segment Coil Bus-Bar Layout for Axially Compact Rotary Machines
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Solution Overview
Problem
The rotary electrical machine faces challenges in axial downsizing due to the elongated configuration space required for the electrical connection conductor, which interferes with its compact design, especially when extending to the welded side terminal section of the segment coil.
Innovation Solution
The electrical connection conductor is configured to be laid in the radial space defined by the segment coils, using a connection wiring section and a connection section that interconnects different segment coils, thereby preventing axial elongation of the configuration space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical connection conductor is laid in the slot arrangement direction (circumferential direction) to cover the welded sections of the coil ends, then the electrical connection can be established, but the configuration space is excessively elongated in the axial direction
Solution Approach 1:
The patent changes the arrangement dimension of the electrical connection conductor from the axial direction to the radial direction. The conductor is laid in the radial space between adjacent segment coils, utilizing the radial dimension that was previously underutilized. This dimensional shift allows electrical connection while avoiding axial elongation, directly resolving the technical contradiction between establishing electrical connection and maintaining compact axial length.
2Reliability
If the electrical connection conductor extends over the top of the welded side terminal section, then the electrical connection is ensured, but the axial downsizing of the rotary electrical machine is interfered with
Solution Approach 1:
The electrical connection conductor is nested within the radial space between adjacent segment coils, rather than extending outward in the axial direction. This nesting approach utilizes the existing radial gaps between coils to accommodate the conductor, ensuring electrical connection is established while the conductor remains contained within the radial boundaries of the coil assembly, thus preventing axial volume increase.
Data Source
AI summary
To provide a rotary electrical machine having a novel configuration adapted to provide axial downsizing of the rotary electrical machine when connecting an electrical connection conductor to a welded side terminal section of a coil end of a segment coil. The rotary electrical machine includes: a stator core 21 including slots radially extended in a radial fashion; a plurality of segment coils 34 radially stacked and accommodated in the slot 37; and a neutral point bus-bar 33 laid on a side of a welded coil end of the segment coil 34 and including a connection wiring section and a connection section for interconnecting the different segment coils. In a state where the segment coils 34 are mounted, at least a part of the connection wiring section is laid in a radial space RS radially defined by the segment coils 34. The connection wiring section can be laid in the radial space RS radially defined by the segment coils 34 so that axial elongation of a configuration space for the electrical connection conductor 33 is prevented. Thus, the axial downsizing of the rotary electrical machine can be achieved.