Electric Rotating Machine Cooling Mechanism for Tilted Operation
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Solution Overview
Problem
Existing cooling mechanisms for electric rotating machines are ineffective in ensuring uniform cooling of coil ends when the machine is tilted, as coolant distribution is compromised due to the orientation of coolant outlets, leading to inadequate cooling of certain areas.
Innovation Solution
The design incorporates a coolant supply cylindrical member with first and second outlets oriented to direct coolant streams to different areas of the coil end, ensuring even distribution and cooling, even when the machine is tilted. The outlets are strategically positioned to direct coolant to both inner and outer surfaces, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coolant outlet is positioned at the central top of the arc-shaped coolant channel, then the coolant can be supplied to the top of the coil end, but when the electric rotating machine is tilted in the axis-turning direction, the coolant fails to drain onto the coil end
Solution Approach 1:
The single coolant outlet is divided into multiple outlets (first and second coolant outlets) positioned at different locations on the coolant supply cylindrical member. This segmentation ensures that at least one outlet remains effective for coolant drainage regardless of the tilt direction, resolving the contradiction between ease of coolant supply and reliability under tilt conditions.
Solution Approach 2:
Different outlets are positioned to supply coolant to different areas of the coil end (inner surface and outer surface). This local quality approach ensures that each outlet can effectively cool specific regions even when the machine is tilted, maintaining cooling reliability across various orientations.
2Reliability
If the coolant outlets are arranged in two lines with staggered positions, then cooling is improved for inclined tilt directions, but cooling fails when the machine is tilted in the axis-turning direction
Solution Approach 1:
The outlets are arranged in three-dimensional space on the coolant supply cylindrical member, extending substantially parallel to the rotor axis. This spatial arrangement in multiple dimensions ensures that coolant outlets are distributed to cover various tilt directions, including axis-turning directions, thereby improving both reliability for inclined tilt and adaptability for all tilt directions.
Solution Approach 2:
The coolant supply cylindrical member with multiple outlets serves multiple functions: it supplies coolant to the top of the coil end, to the inner surface, and to the outer surface. This multi-functionality ensures effective cooling regardless of the tilt direction, resolving the contradiction between reliability for specific tilt directions and adaptability for all directions.
3Ease of operation
If the coolant outlets are located just above the outer circumferential surface of the coil end, then the coolant can reach the outer surface, but the coolant flows downward and hardly reaches the inner surface
Solution Approach 1:
The coolant supply system is segmented into multiple outlets: one positioned to supply coolant to the outer circumferential surface and another positioned to supply coolant to the inner surface. This segmentation ensures that both surfaces receive adequate coolant supply, resolving the contradiction between ease of drainage and reliable cooling coverage.
4Device complexity
If a single coolant outlet is used, then the structure is simple, but the cooling capability deteriorates when the machine is tilted
Solution Approach 1:
The coolant supply cylindrical member with multiple outlets serves multiple functions within a unified structure. It can supply coolant to different areas (top, inner surface, outer surface) depending on the machine orientation, achieving reliable cooling under various tilt conditions without significantly increasing structural complexity.
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 design stabilizes cooling across the entire coil end, maintaining efficiency even when the machine is tilted, by ensuring coolant reaches both inner and outer surfaces, thus addressing the limitations of previous cooling mechanisms.
Implementation Method 1
the coolant supply cylindrical member having a length extending substantially parallel to an axis of rotation of the rotor and being disposed above the stator in a direction of gravitational force
Implementation Method 2
The first and the second coolant outlets are so oriented as to direct streams of the coolant to a first area and a second area of the coil end which are different in location from each other
Data Source
AI summary
An electric rotating machine includes a rotor, a stator in which a coil is so wound as to have an coil end, and a coolant supply pipe. The coolant supply pipe lies with a length thereof extending substantially parallel to an axis of rotation of the rotor and is disposed above the stator in a direction of gravitational force. The coolant supply pipe has a first and a second coolant outlet through which coolant is to be emitted to the coil end. The first and the second coolant outlets are so oriented as to direct streams of the coolant to a first area and a second area of the coil end which are different in location from each other. This enables the coolant to be emitted to almost the whole of the coil end even when the electric rotating machine is titled in a direction in which the rotor turns.