Rotating Electric Machine Cooling with Counterflow Oil and Gas
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Solution Overview
Problem
Existing rotating electric machine systems face inefficiencies due to inadequate cooling, where cooling oil and compressed air temperatures increase, leading to reduced conversion efficiency and magnetic force, and insufficient cooling at one end of the machine, causing overheating and reduced output.
Innovation Solution
A rotating electric machine system with a unique oil circulation and gas supply configuration, where lubricating oil cools the stator and gas cools the rotor, with opposite flow directions to prevent temperature convergence and ensure effective cooling at both ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotating shaft rotates at high speed, then power output increases, but wind losses and frictional resistance increase, causing temperature rise
Solution Approach 1:
The patent employs pneumatic cooling by supplying compressed air to the rotor and hydraulic cooling by circulating cooling oil through the stator. This dual-fluid cooling system effectively manages heat generated at high rotation speeds, maintaining power output while controlling temperature rise through forced convection.
Solution Approach 2:
The patent changes the flow direction parameter of the cooling oil to move opposite to the compressed air flow. This parameter modification optimizes the thermal management system, allowing high-speed operation by preventing temperature convergence and maintaining effective heat dissipation across all operating conditions.
2Power
If continuous induced current is generated, then electrical energy production increases, but heat generation increases, reducing conversion efficiency
Solution Approach 1:
The patent implements continuous cooling action by maintaining constant flow of compressed air to the rotor and cooling oil to the stator. This continuous thermal management removes heat as it is generated during continuous electrical energy production, maintaining conversion efficiency throughout sustained operation.
Solution Approach 2:
The patent introduces cooling oil as an intermediary substance to transfer heat from the stator to the cooling system. The cooling oil absorbs heat generated during continuous electrical energy generation and transports it away, preventing temperature rise that would reduce conversion efficiency.
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 prevents overheating by ensuring efficient cooling of both the rotor and stator, maintaining high conversion efficiency and output by avoiding temperature buildup and convergence.
Implementation Method 1
the lubricating oil flowing through the housing internal oil passage flows in a second direction from the second bearing to the first bearing
Implementation Method 2
the gas flowing in the rotating electric machine housing flows in a first direction from the first bearing toward the second bearing
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 rotating electric machine housing of a rotating electric machine system supports a rotating shaft via a first bearing and a second bearing. A housing internal oil passage is formed inside the rotating electric machine housing. A gas supplied from a gas supplying device flows in the rotating electric machine housing. The gas flows in a first direction from the first bearing to the second bearing. A lubricating oil supplied from an oil circulation supply device flows through a housing internal oil passage. The lubricating oil flows in a second direction from the second bearing to the first bearing.