Rotary Electric Machine Gas Gap Cooling Against Oil Friction
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Solution Overview
Problem
Rotary electric machines face output degradation due to high temperatures and friction caused by oil entering the gap between the rotor and stator, and the generation of three-dimensional vortices leading to heat, which is exacerbated by a small air gap.
Innovation Solution
Supplying compressed gas through dedicated passages to cool the rotor and stator, preventing oil entry and maintaining a small gap to enhance cooling efficiency and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gap between rotor and stator is made small to prevent output decrease, then output is improved, but friction occurs when oil enters the gap resulting in output decrease
Solution Approach 1:
The patent introduces gas as an intermediary substance to prevent oil from entering the gap between rotor and stator. The gas is supplied through dedicated passages into the gap area, creating a barrier that stops oil migration while allowing the rotor to rotate smoothly without friction
Solution Approach 2:
The patent utilizes pneumatic principles by supplying compressed gas through controlled passages into the gap region. This pneumatic approach creates pressure that prevents oil from entering the gap, solving the friction problem while maintaining the small gap configuration for high output
2Temperature
If oil is supplied to cool internal components then cooling effect is achieved, but oil enters the gap causing friction and output decrease
Solution Approach 1:
The patent uses gas as an intermediary substance that separates the cooling function from the gap protection function. Gas is supplied through dedicated passages to prevent oil entry, while cooling is achieved through alternative means that do not involve oil contact with the gap
Solution Approach 2:
The patent extracts the harmful effect of oil by preventing it from entering the gap through dedicated gas supply passages. The oil is kept confined to specific cooling channels while gas occupies the gap region, effectively separating the cooling function from the gap protection function
3Productivity
If the gap is made small to improve output then output is improved, but three-dimensional vortex is generated causing heat generation
Solution Approach 1:
The patent applies pneumatic principles by supplying compressed gas through controlled passages into the small gap. This creates a directed gas flow that prevents three-dimensional vortex formation, thereby reducing heat generation while maintaining the small gap configuration for high output
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
Prevents oil entry into the gap, reduces friction and heat generation, allowing high-load and high-speed operation with improved output by effectively cooling the rotor and stator.
Implementation Method 1
an inflow passage through which a gas is supplied to a gap between the rotor and a stator
Implementation Method 2
a gas is supplied to a gap between the rotor and a stator... to cool the rotor and the stator
Data Source
AI summary
A rotary electric machine includes a rotor, a stator which is disposed at a predetermined interval in a radial direction from an outer circumferential surface of the rotor, a housing which accommodates the rotor and the stator, and an inflow passage through which a gas is supplied to a gap between the rotor and the stator.