Rotating Electric Machine Unit Axial Dimension Reduction
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Solution Overview
Problem
Conventional rotating electric machine units for electric vehicles face challenges in reducing the axial dimension due to the overhang of wiring, which increases the case cover's axial length and requires improvement.
Innovation Solution
The design incorporates a case with bulging portions on the case cover to position wiring along the surface of a third bulging portion closer to the case main body, reducing wiring overhang and minimizing the axial dimension by offsetting the second rotating electric machine's shaft and arranging power distribution members to reduce the case's overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power distribution member is routed on the surface of the case cover, then the wiring can be easily connected, but the axial length of the case cover increases
Solution Approach 1:
The patent utilizes the radial dimension of the case cover by forming bulging portions that protrude toward the coil ends. This allows wiring to be routed along the radial surface of the bulging portions rather than extending axially, effectively converting an axial routing problem into a radial surface utilization solution. The wiring is guided along the curved surface of the bulging portion, which reduces the axial projection length while maintaining wiring accessibility.
Solution Approach 2:
The bulging portions of the case cover feature a curved, spherical-like surface that allows wiring to follow a compact path. By routing wiring along this curved surface instead of a straight axial line, the effective axial length required for wiring connection is reduced. The curvature enables the wiring to wrap around the bulging portion and reach the coil end more efficiently in terms of axial space occupation.
2Ease of operation
If the axial length of the case cover is increased to accommodate wiring, then wiring can be routed externally, but the overall axial dimension of the rotating electric machine unit increases
Solution Approach 1:
The invention shifts the wiring routing from axial extension to radial surface utilization. The bulging portions create additional surface area in the radial direction, allowing wiring to be distributed and connected without increasing the axial envelope of the entire rotating electric machine unit. This dimensional shift enables external wiring routing while maintaining compact axial dimensions.
Solution Approach 2:
The wiring is nested along the surface of the bulging portions of the case cover, which themselves are nested within the overall structure of the rotating electric machine unit. This nested arrangement allows wiring to be accommodated within the existing radial clearance without requiring additional axial space, effectively hiding the wiring path within the structural envelope of the case cover.
3Length of stationary object
If wiring is arranged to reduce axial dimension, then compactness is improved, but wiring arrangement complexity increases
Solution Approach 1:
The curved surface of the bulging portions provides a natural guiding path for wiring, reducing the complexity of wiring arrangement. Instead of requiring complex routing through tight axial spaces or multiple connection points, the curved surface allows wiring to follow a smooth, predetermined path that is easier to install and maintain while achieving compact axial dimensions.
Solution Approach 2:
The bulging portions are strategically positioned at specific locations on the case cover to create localized routing zones. This local quality approach concentrates wiring arrangement complexity only at the bulging portion locations rather than distributing it throughout the entire case cover, making the complex wiring arrangement manageable and localized to specific areas.
Data Source
AI summary
A rotating electric machine unit includes a first rotating electric machine, a second rotating electric machine, and a case having a case main body and a case cover. The first rotating electric machine and the second rotating electric machine each includes a stator core, a multi-phase coil attached to the stator core, and a power distribution member connecting the multi-phase coil. The case cover includes a first bulging portion facing the coil end of the first rotating electric machine, and a third bulging portion facing the coil end of the second rotating electric machine. The third bulging portion is positioned closer to a case main body side than the first bulging portion, and at least a part of a wiring connected to the first rotating electric machine is arranged along a surface of the third bulging portion.