End Shield Inner Recess for Cooling Winding Lead-Outs
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Solution Overview
Problem
Rotating electric machines in vehicles experience overheating due to turbulent air flow, which existing cooling solutions fail to effectively address, leading to inefficient heat dissipation.
Innovation Solution
A rotating electric machine design featuring a flange with a main recess on its internal face that increases the axial distance between the winding and the flange, creating a constant radial air flow channel for laminar airflow, enhancing cooling efficiency while reducing material usage and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an inclined portion is added to the inner face to increase airflow, then cooling efficiency is improved, but turbulent flow is generated which heats the air and reduces cooling effectiveness
Solution Approach 1:
The patent applies curvature by replacing the inclined portion with a rounded profile. The rounded shape guides airflow smoothly along the bun surface, eliminating the turbulent flow generated by sharp inclined edges while maintaining enhanced cooling effectiveness.
Solution Approach 2:
The patent modifies the geometric parameters of the inner face profile. By changing from an inclined angle to a rounded curvature with specific radius parameters, the airflow characteristics are altered to eliminate turbulence while preserving the cooling enhancement.
2Object-generated harmful factors
If a straight portion replaces the inclined portion to eliminate turbulence, then turbulent flow is reduced, but the temperature problem is not resolved as the machine heats up too much
Solution Approach 1:
The patent introduces a rounded profile that combines the turbulence-reducing benefit of a straight portion with the cooling-enhancing benefit of curvature. The rounded shape maintains smooth laminar flow while creating effective airflow guidance for heat dissipation.
3Temperature
If the axial distance between the coil and flange is increased to improve cooling, then heat dissipation is enhanced, but the machine's axial size increases
Solution Approach 1:
The patent addresses the axial distance constraint by modifying the radial profile of the inner face. The rounded shape extends the airflow path radially and axially in a compact manner, achieving enhanced cooling without proportionally increasing the axial dimension.
Solution Approach 2:
The patent optimizes the geometric parameters of the rounded profile to achieve the desired balance between cooling effectiveness and compact axial size. By carefully selecting the radius and position parameters, effective cooling is achieved within constrained axial dimensions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively cools the machine by promoting laminar airflow, reducing material and weight, and maintaining a consistent axial distance to improve heat dissipation without increasing the machine's axial size.
Implementation Method 1
allow the machine to be cooled by air circulation generated by the rotation of fans positioned on the axial end faces of the rotor
Implementation Method 2
the air also flows laminarly. These two effects combine to efficiently cool the machine
Implementation Method 3
efficiently cool the machine
Data Source
Figure 1~2
Figure 3~4
AI summary
Rotary electric machine (10) for a motor vehicle, comprising: a stator (16), extending along an axis (X), the stator comprising a body (19) and a winding (18) provided with lead-out wires (20, 21) extending axially on either side of the stator body (19), at least one end shield (35) comprising a plate (53) extending transversely and a skirt (54) extending axially from the plate (53), the plate (53) comprising an inner face (62) oriented towards a lead-out wire of the winding (20), characterised in that the inner face (62) comprises a main recess (64) which increases the minimum axial distance (d) separating the lead-out wire (20) from the inner face (62), the main recess (64) having a bottom (642) extending radially.