Rotating Electrical Machine Cooling Device Tilting
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Solution Overview
Problem
Conventional rotating electric machines require larger cooling devices to enhance heat exchange performance, leading to increased size and weight, and when size constraints limit cooling device growth, heat exchange performance is compromised.
Innovation Solution
The cooling device in the rotating electric machine is designed with end-face portions tilted relative to the minimum-width direction of the cooling fluid duct or the inflow/outflow directions, allowing for increased flow-path area without enlarging the duct size, enabling smaller, lighter cooling devices with improved heat exchange performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling device is enlarged to enhance heat exchange performance, then the heat exchange performance is improved, but the size and weight of the cooling device increase
Solution Approach 1:
The end-face portions are tilted relative to the minimum-width direction of the cooling fluid duct, transforming the conventional perpendicular arrangement into a dimensional variation. This tilting configuration increases the flow-path area by utilizing the duct's depth dimension more effectively, allowing enhanced heat exchange performance without increasing the cooling device's external dimensions or weight.
Solution Approach 2:
The invention changes the geometric parameters of the cooling device by tilting the end-face portions at specific angles relative to the duct's minimum-width direction. This parameter modification optimizes the flow-path area and cooling fluid circulation, achieving improved heat exchange performance without proportionally increasing the device's size and weight.
2Reliability
If the cooling device is enlarged to enhance heat exchange performance, then the heat exchange performance is improved, but the size of the cooling device increases
Solution Approach 1:
By tilting the end-face portions relative to the minimum-width direction, the invention exploits the duct's internal depth dimension to increase the effective flow-path area. This dimensional approach allows the cooling device to achieve larger heat exchange surface area without increasing its external footprint or overall size.
3Weight of stationary object
If the cooling device size is reduced to decrease weight, then the weight is reduced, but the heat exchange performance is compromised
Solution Approach 1:
The tilting of end-face portions changes the geometric parameters of the cooling device, optimizing the flow-path area within a compact form. This parameter optimization allows the cooling device to maintain adequate heat exchange performance while reducing its size and weight compared to conventional perpendicular configurations.
4Reliability
If the cooling fluid duct size is increased to accommodate larger cooling device, then the heat exchange performance is improved, but the outer dimensions of the rotating electric machine increase
Solution Approach 1:
The tilting configuration of end-face portions allows the cooling device to achieve larger flow-path area within the existing duct dimensions. This dimensional optimization eliminates the need to increase the cooling fluid duct size or the outer dimensions of the rotating electric machine while still improving heat exchange performance.
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 allows for high heat exchange performance while reducing the size and weight of the cooling device, resulting in a smaller, lighter rotating electric machine without increasing the outer dimensions of the cooling fluid ducts.
Implementation Method 1
a cooling device (10) placed in the internal space (701) of the first cooling fluid duct (1a), for cooling the cooling fluid
Implementation Method 2
Each of the cooling devices (10a and 10b) includes a plurality of cooling pipes (107) which extend along the respective first end-face portion (101) and second end-face portion (102), connecting therebetween
Implementation Method 3
a pair of cooling fans (91 and 92) fixed on both end portions of the rotor (2) in an axial direction thereof is mounted to oppose to each other on both the end portions in the axial direction of the stator (4) and the rotor (2), and thus the cooling fluid is transported under pressure into the gap (6)
Implementation Method 4
at least one of the first end-face portion (101) and the second end-face portion (102) is placed tilting with respect to a minimum-width's direction (DW) of an internal space (71 and 72) of a cooling fluid duct (1a and 1b) in vicinity to the cooling device (10), or placed tilting with respect to at least one of an inflow direction (11) of the cooling fluid and an outflow direction (12) of the cooling fluid, so that a flow-path area of the cooling device (10) can be increased
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A cooling device mounted in a flow path formed by an internal space of a cooling fluid duct being mounted on the periphery of a frame of a rotating electric machine is configured in such a manner that at least one of the end-face portions between a first end-face portion through which a cooling fluid flows into the cooling device and a second end-face portion from which the cooling fluid flows out thereof is placed tilting with respect to at least one of a first orthogonal surface perpendicular to an inflow direction of the cooling fluid and a second orthogonal surface perpendicular to an outflow direction of the cooling fluid, or with respect to a flow-path-width's direction perpendicular to a direction in which an axis line of a stator extends.