Stator Interconnection Layout for Uniform Phase Resistance
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Solution Overview
Problem
Existing rotating electrical machine stators face resistance imbalances between phases due to varying winding lengths, which affects the performance and efficiency of the machine.
Innovation Solution
The stator design incorporates an interconnector with radially positioned annular traces and insulating walls, ensuring that coil inputs and outputs are positioned on either side of the connector, standardizing wire lengths and maintaining homogeneous resistance across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coils are interconnected using annular conductive traces arranged in radial planes, then the electrical connection between coils is achieved, but the winding length from one phase to another becomes unequal, causing resistance imbalances between phases
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of conductive traces to a three-dimensional configuration where traces are distributed along the axial direction of the stator. This dimensional change allows the traces to be positioned at different axial locations, enabling equal winding lengths from all coils to a common neutral point while maintaining effective electrical connection.
Solution Approach 2:
The interconnector is segmented into multiple conductive traces arranged axially, with each trace serving a specific phase or connection function. This segmentation allows independent optimization of each trace's position and length, ensuring that all coils have equal winding lengths to their respective neutral points while maintaining electrical connectivity.
2Adaptability or versatility
If coil inputs and outputs are positioned at different axial locations, then connection flexibility is improved, but wire lengths between phases become unequal, leading to resistance imbalances
Solution Approach 1:
The patent utilizes the axial dimension to position coil inputs and outputs at different axial locations while maintaining equal wire lengths. By distributing the conductive traces axially and positioning the neutral point appropriately, the system achieves both connection flexibility and wire length uniformity simultaneously.
Solution Approach 2:
Different regions of the coil windings have different positioning requirements - inputs at one axial location and outputs at another. The patent applies local quality by allowing different axial positions for inputs and outputs while compensating through the overall trace arrangement to ensure equal total lengths from all coils to the neutral point.
3Reliability
If annular conductive traces are stacked axially with insulating walls, then electrical insulation between phases is improved, but the complexity of the interconnector structure increases
Solution Approach 1:
The patent merges the insulating function with the structural support function by integrating insulating walls into the interconnector body. These walls serve dual purposes: providing electrical insulation between axially stacked conductive traces and maintaining the mechanical structure that positions the traces and supports the coils.
Solution Approach 2:
The insulating walls perform multiple functions simultaneously: electrical insulation between phases, mechanical support for the conductive traces, and structural framework for the entire interconnector assembly. This multi-functionality reduces the need for separate insulating components, thereby reducing overall structural complexity.
Data Source
Figure 1~2a
Figure 2b~2b'
Figure 3~4
AI summary
The invention relates to a stator (11) of a rotating electrical machine, in particular for a motor vehicle, said stator comprising: - a stator body (12) having an axis (X) and a plurality of teeth (14) angularly distributed around said axis (X), the stator body (12) forming an outer periphery and an inner periphery around said axis (X), - coils (19) each mounted around a tooth (14), each of the coils (19) being formed by at least a one wire wound around the corresponding tooth (14), - each coil wire comprising an input (211) and an output (212) each corresponding to one end of said wire (21), - an interconnection (22) comprising a set of traces (26), the traces (26) being electrically connected to the inputs (211) and outputs (212) of the coils (19), said interconnection (22) being mounted between the inner periphery and the outer periphery of the stator body (12), characterised in that each coil (19) has one end (211, 212) positioned on the side of the inner periphery and the other end (211, 212) positioned on the side of the outer periphery of the stator (11), and in that the set of traces (26) is positioned between the inputs (211) and the outputs (212) of said coils (19).