Rotary Electric Machine Cooling Unit Placement
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Solution Overview
Problem
The complexity of connections between gas cooling units and circulation paths in rotary electric machines increases the size of the machine, reducing installation flexibility, especially when cooling units are placed on side surfaces, requiring a large installation area for optimal performance.
Innovation Solution
A rotary electric machine design with a gas cooling unit that includes intake and exhaust ports, a high and low temperature cooling gas flow path, and a heat insulating unit between the low temperature path and the casing, allowing the ventilation surface to be positioned above, below, or beside the casing, minimizing the volume of gas cooling units and preventing heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas cooling units are distributed on both side surfaces of the rotary electric machine to maximize cooling performance, then cooling efficiency is improved, but the installation area required increases and installation flexibility is reduced
Solution Approach 1:
The patent positions the ventilation surface of the gas cooling unit above, below, or beside the side surface of the casing rather than directly on the side surface. This spatial repositioning allows the cooling unit to achieve effective cooling without projecting outward, thereby reducing the required installation area while maintaining cooling efficiency.
2Reliability
If multiple gas cooling units are distributed to optimize cooling performance, then cooling effectiveness is improved, but the connection between cooling units and circulation paths becomes more complicated
Solution Approach 1:
The patent integrates the high temperature cooling gas flow path and low temperature cooling gas flow path within a single gas cooling unit structure. The ventilation surface serves as a shared heat exchange component for both flow paths, simplifying the overall connection architecture between cooling units and circulation paths while maintaining effective cooling performance.
3Reliability
If gas cooling units are positioned to maximize cooling performance, then cooling capability is improved, but the outer dimensions of the rotary electric machine increase
Solution Approach 1:
The patent designs the gas cooling unit with nested flow paths where the low temperature cooling gas flow path is positioned close to the casing and the high temperature cooling gas flow path is positioned away from the casing. This nested arrangement allows both cooling functions to be integrated within a compact volume, minimizing the outer dimensions of the rotary electric machine while maintaining effective cooling capability.
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 enhances cooling efficiency, reduces the number of gas cooling units needed, minimizes installation area, and increases installation flexibility by optimizing the placement of the gas cooling unit.
Implementation Method 1
a ventilation surface exchanging heat with the cooling gas at high temperature and cooling the cooling gas
Implementation Method 2
a heat insulating unit provided between the low temperature cooling gas flow path of the gas cooling unit and the casing, the heat insulating unit preventing transfer of heat between the low temperature cooling gas flow path and the casing
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In a rotary electric machine having a cooling structure for cooling a stator and a rotor by circulating a cooling gas, a gas cooling unit is disposed above, below, or beside the side surface of a casing in which the stator and the rotor are accommodated and a heat insulating unit for preventing transfer of heat is provided between a low temperature cooling gas flow path in the gas cooling unit and the casing.