Electric Machine Oil Circuit Separation for Stator and Bearing Cooling
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Solution Overview
Problem
In rotating electric machines, the heat generated from continuous current production leads to increased temperature in electromagnetic coils, reducing conversion efficiency and magnetic force, and the existing cooling methods are inefficient in cooling bearings, potentially causing seizure.
Innovation Solution
A rotating electric machine system with a separate oil circulation system that supplies low-temperature lubricating oil to bearings and cooling oil to the stator, preventing heated oil from reaching the bearings and ensuring effective lubrication and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling oil is supplied to the stator chamber to cool the stator, then the stator temperature is reduced, but the cooling oil becomes heated and contacts the bearings, reducing bearing cooling effectiveness
Solution Approach 1:
The patent divides the cooling system into separate circuits: a first cooling circuit for the stator using cooling oil, and a second cooling circuit for the bearings using lubricating oil. This segmentation prevents heated cooling oil from contacting the bearings, maintaining bearing cooling effectiveness while still achieving stator temperature reduction.
Solution Approach 2:
The patent introduces a separator as an intermediary component that prevents direct contact between the cooling oil (heated by the stator) and the bearings. The separator ensures that only cooled lubricating oil reaches the bearings, mediating the interaction between the cooling system and bearing lubrication system.
2Power
If the rotating shaft rotates at high speed to increase output, then the power generation capacity increases, but wind losses and frictional resistance increase, causing temperature rise
Solution Approach 1:
The patent segments the cooling functions into separate circuits for the stator and rotor, with independent temperature control. This allows the rotor to operate at high speeds for increased power output while the segmented cooling system manages the resulting temperature rise in both rotor and stator independently.
Solution Approach 2:
The lubricating oil serves multiple functions: it lubricates the bearings to reduce frictional resistance from high-speed rotation, and it is also cooled in a separate circuit to prevent temperature rise in the rotor and stator, demonstrating multi-functionality in managing both mechanical and thermal aspects of high-speed operation.
3Productivity
If continuous current is generated in the rotating electric machine to maintain output, then electrical energy production is sustained, but heat generation increases, reducing conversion efficiency
Solution Approach 1:
The patent implements segmented cooling circuits that independently manage thermal loads from continuous current generation. The first cooling circuit handles stator heat, while the second handles rotor heat, allowing sustained electrical energy generation without excessive temperature rise that would reduce conversion efficiency.
Solution Approach 2:
The patent establishes continuous cooling action through separate cooling circuits that operate concurrently with continuous current generation. The cooling oil and lubricating oil continuously circulate through their respective circuits, maintaining thermal management during sustained productivity operations and preventing efficiency degradation.
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 solution maintains a predetermined magnetic force, suppresses efficiency reduction, and allows for higher output by effectively cooling the bearings and stator, preventing seizure and maintaining mechanical to electrical energy conversion efficiency.
Implementation Method 1
an oil circulation supply device configured to circulate and supply a lubricating oil to the first bearing, the second bearing, and a housing internal oil passage
Implementation Method 2
supply the lubricating oil toward the housing internal oil passage via the second oil supply line... recover, via the second oil recovery line, the lubricating oil that has flowed through the housing internal oil passage
Implementation Method 3
When the rotating shaft rotates, an alternating magnetic field is formed by the permanent magnets and the electromagnetic coils in the stator. As a result, an induced current is generated in the electromagnetic coils.
Data Source
AI summary
A rotor that constitutes part of a rotating electric machine system includes a rotating shaft. The rotating shaft is supported in a rotating electric machine housing via a first bearing and a second bearing. An oil circulation supply device supplies lubricating oil to the first bearing and the second bearing via a first oil supply line. Further, the oil circulation supply device supplies lubricating oil as a cooling oil via a second oil supply line, with respect to a housing internal oil passage in which a stator of the rotating electric machine system is accommodated. The first oil supply line and the second oil supply line are separate lines.