Rotating Machine Winding Structure for Coil End Downsizing
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Solution Overview
Problem
Existing rotating electric machine winding structures with distributed winding face challenges in downsizing coil ends due to significant deformation in narrow regions, particularly at crank-shaped portions, which complicates the reduction of coil end size.
Innovation Solution
A winding structure for rotating electric machines featuring intersecting first and second windings, where straight portions of the coil are inserted into slots at a given interval, allowing for assembly without significant deformation and enabling downsizing of coil ends by optimizing the winding pitch and intersection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of the crank shape is increased to reduce deformation, then the winding deformation is reduced, but the coil end size cannot be downsized
Solution Approach 1:
The patent introduces a third winding that extends in the axial direction, perpendicular to the plane of the first and second windings. This dimensional change allows the windings to intersect and support each other without requiring large crank shapes, as the third winding provides structural support in the axial dimension, enabling coil end downsizing while maintaining low deformation
Solution Approach 2:
The patent arranges the first, second, and third windings in a nested configuration where they intersect and pass through each other's planes. The windings are positioned such that they nest within the same spatial region, with each winding providing support to the others, thereby reducing the need for large crank shapes while maintaining structural integrity
2Length of moving object
If the winding passes over and under neighboring winding in a narrow region, then the coil end size is reduced, but significant deformation occurs
Solution Approach 1:
The patent creates different local structures at different positions: the first and second windings have crank shapes at their coil end portions, while the third winding has a straight configuration. This local differentiation allows each winding to fulfill its specific function - the crank-shaped windings provide flexibility for slot insertion, while the straight third winding provides structural support and reduces deformation in the narrow region
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A winding structure for a rotating electric machine includes: a core including slots; and a coil including a first winding and a second winding combined by intersecting the first winding and the second winding with each other. Each straight portion of the coil is inserted into any one of two slots arranged at a given interval so that the coil is assembled to the core.