Rotating Electrical Machine Oil Supply Route Simplification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotating electrical machines have complex case structures due to integrated oil supply routes for cooling rotors and lubricating bearings, leading to increased manufacturing costs and instability in oil supply when multiple machines are pressure-fed with one pump, especially when rotor speeds vary.
Innovation Solution
A simplified oil supply route structure featuring bearing holders, rotor cooling oil channels, an oil lead-in part, oil reception part, oil reservoir, and oil discharge part, allowing oil to flow through the housing and shaft for both cooling and lubrication, with an injection hole and communicating holes for stable pressure-fed oil distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil supply routes for cooling rotor and lubricating bearing are formed using housing or cover, then cooling and lubrication functions are achieved, but case structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent combines the cooling oil passage and bearing lubrication oil passage into a single integrated oil passage structure within the housing. The cooling oil passage communicates with the bearing lubrication oil passage, allowing one oil supply route to serve dual purposes for both rotor cooling and bearing lubrication, thereby simplifying the case structure while maintaining reliable cooling and lubrication functions.
2Device complexity
If one pump supplies oil to multiple rotating electrical machines, then oil supply system is simplified, but oil supply balance becomes unstable when rotor speeds vary
Solution Approach 1:
The patent enables each rotating electrical machine to self-regulate its oil supply by utilizing the negative pressure generated by its own rotor rotation. The oil suction port allows the rotor to draw oil from the housing based on its rotational speed, creating a self-balancing mechanism where each machine automatically adjusts its oil consumption according to its operational demands, thus maintaining stable oil supply balance across multiple machines with varying speeds.
3Ease of operation
If rotor rotates to generate negative pressure for oil absorption, then oil supply to rotor is achieved, but oil supply balance is disrupted when number of rotations varies between machines
Solution Approach 1:
The patent enables each rotating electrical machine to self-regulate its oil supply by utilizing the negative pressure generated by its own rotor rotation. The oil suction port allows the rotor to draw oil from the housing based on its rotational speed, creating a self-balancing mechanism where each machine automatically adjusts its oil consumption according to its operational demands, thus maintaining stable oil supply balance across multiple machines with varying speeds.
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 simplifies the housing structure, reduces manufacturing costs, and maintains stable oil supply balance across machines with varying rotor speeds by using a single pump, ensuring efficient cooling and lubrication.
Implementation Method 1
a rotor cooling oil channel that is designed to let oil flow inside the shaft, the rotor core, and the end plates
Implementation Method 2
each rotating electrical machine is configured to absorb oil with negative pressure generated by the rotation of its rotor
Data Source
AI summary
A rotating electrical machine includes: an oil reception part that has an opening opposed to an injection hole designed to inject ATF into the atmospheric pressure inside a housing; and an oil reservoir that communicates with the oil reception part via a communicating hole provided in a wall part and communicates with a rotor cooling oil channel of a shaft via a cooling oil lead-in hole provided in the wall part. Since ATF having flowed out of the oil reception part flows along an inner face of the wall part of a second housing by gravity and reaches a bearing, one ATF supply route can be used both for cooling a rotor and lubricating a bearing, whereby the ATF supply route can be simplified.