Rotating Electrical Machine Insulating Cover with Through-Holes
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Solution Overview
Problem
Existing rotary electric machines lack effective insulation and cooling structures for bus bars arranged in directions other than vertically, leading to potential short circuits and insulation degradation.
Innovation Solution
A rotary electric machine design featuring a stator with coils, a housing, bus bars, an insulating cover with gaps, and a coolant supply unit, where the insulating cover covers lower surfaces of bus bars and includes through holes for coolant discharge, reducing the risk of short circuits and improving insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating cover completely encloses the bus bars to improve insulation, then insulation performance is improved, but cooling fluid may be trapped inside causing short circuits
Solution Approach 1:
The insulating cover incorporates through-holes that allow cooling fluid to pass through and escape, preventing fluid entrapment while maintaining insulation. The holes create a controlled porosity that resolves the contradiction between enclosure for insulation and openness for fluid drainage.
Solution Approach 2:
The through-holes act as intermediary elements that mediate between the insulation function (enclosure) and the cooling function (fluid flow). They allow the insulating cover to simultaneously provide electrical insulation while permitting cooling fluid to escape, resolving the harmful effect of fluid retention.
2Volume of moving object
If the bus bars are arranged horizontally to reduce radial dimensions, then compactness is improved, but insulation and cooling structures become more complex
Solution Approach 1:
The insulating cover serves multiple functions simultaneously: it provides electrical insulation, facilitates cooling fluid flow through integrated through-holes, and structurally supports the horizontally arranged bus bars. This multi-functionality reduces overall device complexity despite the non-conventional horizontal arrangement.
Solution Approach 2:
The insulation cover and cooling structure are merged into a single integrated component rather than separate elements. The through-holes are incorporated directly into the insulating cover, combining insulation and cooling functions in one part, thereby reducing complexity.
3Volume of moving object
If the insulating cover is positioned close to the stator to reduce dimensions, then compactness is improved, but insulation between stator and bus bars may be compromised
Solution Approach 1:
The insulating cover extends in the axial direction to provide insulation between the stator and bus bars, rather than relying solely on radial distance. This dimensional approach allows compact radial dimensions while maintaining adequate insulation through axial positioning and structure.
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 enhances insulation and cooling performance, reduces the machine's radial dimensions, and prevents coolant retention, thereby preventing short circuits and degradation of the insulating cover.
Implementation Method 1
an insulating cover attached to the bus bars with gaps between the bus bars and the insulating cover, and configured to cover at least portions of lower surfaces of the bus bars
Implementation Method 2
A through hole is defined in a bottom surface of the insulating cover and extends vertically through the bottom surface. since the through hole is formed in the bottom surface of the insulating cover, the cooling fluid can be discharged from the through hole when the cooling liquid enters the insulating cover
Implementation Method 3
a coolant supply unit configured to supply a cooling fluid for cooling the stator to inside of the housing
Implementation Method 4
a coolant supply unit configured to supply a cooling fluid for cooling the stator to inside of the housing
Data Source
AI summary
A rotating electrical machine is provided with: a plurality of bus bars that provide an electrical relay between an external power line, which is positioned on the outside of a housing, and a multiphase coil; an insulation cover that is mounted on the plurality of bus bars with a prescribed gap between each, and covers at least part of the bottom surface of each bus bar; and a coolant supply means that supplies a cooling fluid, which cools a stator, inside the housing. A through-hole, which vertically penetrates a bottom surface, is formed on the bottom surface of the insulation cover.