Electric Motor Cooling with Semi-Permeable Membrane for Condensate Control
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Solution Overview
Problem
Liquid-cooled electric motors face significant challenges in managing condensate formation due to large temperature differences, which can damage the engine, and existing solutions like regular oil changes are costly and impractical in operational situations.
Innovation Solution
An electric motor design featuring a casing with a semi-permeable membrane impermeable to liquid water but permeable to water vapor, combined with an internal fan for forced air circulation, creating a pressure differential to enhance vapor evacuation, and a radial air ejection fan to promote gas exchange and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling circulation is used, then cooling efficiency is improved, but condensate formation increases
Solution Approach 1:
The patent employs a porous hydrophobic membrane material that allows water vapor to pass through while blocking liquid water. This membrane is integrated into the cooling system to enable vapor evacuation while maintaining liquid cooling efficiency, thus resolving the contradiction between effective cooling and condensate management.
Solution Approach 2:
The patent converts the harmful condensate into a beneficial vapor phase that can be evacuated through the porous membrane. By allowing vapor to escape while blocking liquid, the system transforms the problematic condensate accumulation into a controlled vapor removal process, maintaining cooling efficiency without damage from liquid condensate.
2Reliability
If regular oil changes are performed, then condensate damage is prevented, but maintenance costs and operational downtime increase
Solution Approach 1:
The patent implements a self-service condensate removal system where the porous membrane automatically evaporates and evacuates condensate without requiring external intervention. The system continuously manages its own condensate problem through the membrane's selective permeability, eliminating the need for regular maintenance oil changes while maintaining reliability.
Solution Approach 2:
The patent extracts the condensate removal function from the traditional maintenance routine by integrating a porous membrane that continuously evacuates vapor. This separates the condensate management function from periodic maintenance operations, enabling continuous operation without downtime for condensate removal.
3Reliability
If a liquid-impermeable membrane is used, then liquid water seal is improved, but water vapor evacuation is hindered
Solution Approach 1:
The patent uses a porous hydrophobic membrane that exploits surface tension effects to block liquid water while allowing water vapor to pass through the pores. This material property enables simultaneous achievement of liquid tightness and vapor permeability, resolving the contradiction between seal integrity and vapor evacuation.
Solution Approach 2:
The patent applies the porous membrane selectively at specific locations within the cooling system where vapor evacuation is needed while maintaining liquid seal. The local application of this specialized material creates different functional zones: areas with the membrane for vapor removal and areas without for liquid cooling, thus resolving the contradiction between sealing and ventilation.
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
Effectively evacuates humidity and cools the motor by facilitating gaseous exchanges and heat transfer, reducing maintenance needs and operational costs while maintaining a reliable seal.
Implementation Method 1
a membrane forming a barrier to liquid water between the inside and outside said housing but permeable to water vapour
Implementation Method 2
the motor further comprises an internal fan to generate air circulation forced, the membrane being located in an area where the forced air circulation exposes the latter on the inside to a pressure greater than atmospheric pressure
Implementation Method 3
The circulation of air through the stator allows it to be cooled by heat exchange with the coolant also flowing through the stator
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an electrical engine comprising a housing provided with an opening (21) having a diaphragm (131) that forms a barrier to liquid water located between the inside and the outside of said housing but is pervious to water vapor. The stator is liquid-cooled, and the engine comprises an inner fan (12) for generating a forced air flow inside the engine. The diaphragm (131) is located in an area where the forced air flow exposes the latter on the inside to pressure greater than the atmospheric pressure.