Rotating Electric Machine Housing with Oblique Protrusions
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Solution Overview
Problem
Conventional rotating electric machines with outer ribs on the housing surface fail to effectively improve torsional rigidity, leading to insufficient reduction of noise and vibration, especially under high load conditions.
Innovation Solution
The design incorporates elongate protrusions on the external surface of the tubular housing that overlap the coolant passage, extending obliquely or parallel to the axial direction, which intersect each other to enhance torsional rigidity and reduce membrane vibration by evenly distributing circumferential reaction stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If outer ribs are formed on the housing surface, then noise and vibration are reduced, but torsional rigidity is insufficient under high load conditions
Solution Approach 1:
The housing is segmented into a tubular part and a flange part, with the tubular part containing internal ribs and the flange part providing external reinforcement. This segmentation allows each part to specialize in different functions: the internal ribs handle torsional rigidity while the external surface features handle noise and vibration reduction.
Solution Approach 2:
Different regions of the housing are given different structural qualities: the tubular part has internal ribs for torsional strength, while the external surface has optimized curvature and positioning features for noise and vibration control. This local differentiation resolves the contradiction by applying the right structural quality in the right location.
2Strength
If the housing structure is reinforced to improve torsional rigidity, then structural integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The internal ribs and the tubular housing are formed as an integrated structure through injection molding, combining the housing shell and reinforcement ribs into a single manufactured component. This merging eliminates separate assembly steps while maintaining the torsional rigidity provided by the ribbed structure.
Solution Approach 2:
The mechanical assembly of separate housing components is replaced with a molded-integral structure where the ribs are formed directly as part of the housing. This substitution of manufacturing method reduces assembly complexity while achieving the desired structural reinforcement.
3Temperature
If coolant passage area is increased to improve cooling efficiency, then heat dissipation is enhanced, but housing structural strength is reduced
Solution Approach 1:
The housing is segmented into functional zones: the tubular part contains the coolant passage for thermal management, while the flange part provides structural reinforcement. This segmentation allows the coolant passage to be optimized for heat dissipation without compromising overall housing strength, as the load-bearing function is handled by the reinforced flange region.
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
This configuration significantly improves torsional rigidity, effectively reducing noise and vibration caused by torque ripple and enhances air-cooling efficiency while maintaining structural integrity and sealing performance.
Implementation Method 1
Between the inner wall portion and the outer wall portion, there is formed an annular coolant passage through which coolant flows
Implementation Method 2
at least one elongate protrusion is formed, in an axial range where the at least one elongate protrusion radially overlaps the coolant passage, to extend obliquely or parallel to an axial direction of the rotating shaft
Data Source
AI summary
A rotating electric machine includes a rotating shaft, a rotor fixed on the rotating shaft, a stator arranged to radially face the rotor, and a housing having a tubular part. The tubular part has the stator assembled thereto on a radially inner or radially outer side thereof. Moreover, the tubular part has an inner wall portion and an outer wall portion that are radially spaced from and radially face each other. Between the inner wall portion and the outer wall portion, there is formed an annular coolant passage through which coolant flows. On an external surface of the tubular part of the housing on an opposite radial side to the stator, at least one elongate protrusion is formed, in an axial range where the at least one elongate protrusion radially overlaps the coolant passage, to extend obliquely or parallel to an axial direction of the rotating shaft.