Stator Coil Segment Variable Cross Section
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Solution Overview
Problem
Existing stator designs for rotating electric machines face a trade-off between improving electrical efficiency and reducing the size of the stator, as increasing the cross-sectional area of coil segments to reduce electrical resistance leads to larger coil ends and overall stator size.
Innovation Solution
The design involves coil segments with varying cross-sectional areas, where the coil end segments have a greater or lesser cross-sectional area than the inner segments, and connection portions are widened towards the outer circumference, allowing for reduced electrical resistance and stator size without increasing the stator's width or height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cross-sectional area of the coil segment is increased, then electrical resistance is reduced and electrical efficiency is improved, but the size of the coil end and the stator is increased
Solution Approach 1:
The coil segment is designed with a variable cross-sectional area along its length, where the connection portion at the coil end has a different cross-sectional area than the leg portion inserted in the slot. This local variation allows optimization of electrical resistance at the coil end without uniformly increasing the entire coil segment size, thereby addressing the contradiction between reducing electrical resistance and maintaining compact stator dimensions.
2Use of energy by moving object
If the cross-sectional area of the coil segment is increased, then electrical efficiency is improved, but the height and width of the stator are increased
Solution Approach 1:
The invention applies local quality by varying the cross-sectional area of the coil segment at specific locations (connection portion vs. leg portion) rather than uniformly increasing the entire coil. This allows improving electrical efficiency at the coil end where current density is highest, without proportionally increasing the overall stator dimensions.
Solution Approach 2:
The coil segment's cross-sectional area is varied along its longitudinal dimension, creating a dimensional gradient. The connection portion has a different cross-sectional area than the leg portion, allowing electrical efficiency optimization in one dimension (cross-section at coil end) without uniformly expanding the stator in all dimensions.
Data Source
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AI summary
A stator core (10) of a stator (50) includes a plurality of teeth (12) around a rotation axis and slots (14) respectively provided between the teeth (12). A coil (60) that is formed by connecting a plurality of coil segments (40, 62) is wound around the teeth (12). At a coil end (64) of the coil (60) protruding from an end surface of the stator core (10) in the rotation axial direction, a widened portion (40a) is provided in the coil segment (40). Therefore, a cross-sectional area of the coil segment (40) at the coil end (64) is different from that on the inner side of the slot (14).