Rotor-Integrated Generator Cooling via Phase Transition
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Solution Overview
Problem
Current oil-based cooling systems for helicopter generators are complex, costly, and heavy, negatively impacting helicopter performance, and there is a need for a simpler, lighter, and more efficient cooling solution to manage the heat generated by high-power generators used for de-icing rotor blades.
Innovation Solution
A cooling system utilizing a two-phase heat transfer fluid with an evaporator and condenser, where the electric generator is housed within the rotor, allowing for efficient heat transfer and evacuation without the need for oil circulation, and the condenser can be rotating with an external surface to effectively dissipate heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an oil circulation cooling system is used for the electric generator, then the heat removal efficiency is improved, but the device complexity, cost and weight increase
Solution Approach 1:
The patent employs a two-phase heat transfer fluid (liquid/vapor) that circulates through the generator components. The fluid absorbs heat by evaporating in high-temperature zones (such as around the stator and rotor) and condenses in lower-temperature zones, utilizing phase change to efficiently transfer heat without requiring complex oil circulation pumps, filters, and cooling towers. This phase transition mechanism provides superior heat removal efficiency while dramatically simplifying the cooling system architecture.
2Temperature
If an oil circulation cooling system is used for the electric generator, then the heat removal efficiency is improved, but the weight of the helicopter increases
Solution Approach 1:
The two-phase heat transfer system replaces heavy oil circulation equipment with lightweight evaporator-condenser assemblies distributed throughout the generator. The phase change process occurs naturally due to temperature differences, eliminating the need for heavy pumps and large external heat exchangers. This results in significant weight reduction while maintaining or improving heat removal efficiency compared to conventional oil cooling systems.
3Volume of moving object
If the electric generator is housed inside the rotor, then the system compactness is improved, but the heat evacuation capability becomes more difficult
Solution Approach 1:
By integrating evaporator and condenser units directly within the rotor housing, the system achieves compact heat evacuation. The two-phase fluid circulates through channels in the rotor structure, absorbing heat from the generator components in a confined space. The vapor rises to condenser sections where it releases heat to the surrounding air or cooling medium, enabling efficient heat evacuation within the limited volume of the rotor assembly without compromising thermal management.
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 provides a compact, reliable, and efficient cooling system that reduces the weight and complexity of helicopter systems while effectively managing heat, ensuring the generator operates within safe temperature limits and enhances performance by exploiting changes of state in the heat transfer fluid for increased heat transfer power.
Implementation Method 1
Heat produced by the generator is transferred to a heat transfer fluid by vaporizing the fluid in an evaporator
Implementation Method 2
Heat produced by the generator is transferred to a heat transfer fluid by vaporizing the fluid in an evaporator
Implementation Method 3
the vaporized fluid is transported to a condenser
Implementation Method 4
the fluid is condensed in the condenser, the heat supplied by the fluid being transferred to the air surrounding the condenser
Implementation Method 5
the fluid is condensed in the condenser, the heat supplied by the fluid being transferred to the air surrounding the condenser
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A method for cooling an electric generator (50) designed to supply a first rotor (60) with electrical power, the first rotor being capable of being brought into rotation relative to a fixed structure, the method being characterised in that the electric generator is disposed in a chamber (62) provided inside the first rotor, and in that it comprises the following steps: a) transferring heat produced by the generator to a heat transfer fluid by vaporising the fluid in an evaporator (64); b) transporting the vaporised fluid to a condenser; c) condensing the fluid in the condenser, the heat supplied by the fluid being transmitted to the air surrounding the condenser.