Electric Traction Cooling System Deaeration Line
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Solution Overview
Problem
Existing cooling systems for electric traction machines in motor vehicles face challenges in efficiently dissipating waste heat while maintaining effective electrical insulation, as air entrainment in the cooling liquid decreases both the insulating properties and heat capacity, necessitating a solution to minimize air in the system and ensure maximum temperature control performance.
Innovation Solution
A cooling system with a circulation system, a circulation pump, motor inlet and outlet connections, and a heat exchanger, featuring a second deaeration line that connects the highest locations on the winding head regions to facilitate the removal of air entrainment, ensuring effective electrical insulation and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dielectric cooling liquid is used to directly cool the traction machine, then cooling performance is improved, but air entrainment decreases electrical insulation and heat capacity
Solution Approach 1:
The patent extracts and removes air from the cooling system through dedicated deaeration lines that connect the highest points of the circulation system to the environment or a deaeration tank, eliminating the harmful air entrainment that compromises electrical insulation and heat capacity while preserving the direct dielectric cooling approach
Solution Approach 2:
The patent introduces a deaeration line as an intermediary component that mediates between the closed cooling circulation system and the environment, providing a controlled path for air removal that prevents air accumulation in the cooling liquid without requiring system opening or compromising the dielectric cooling effectiveness
2Reliability
If the cooling system is designed to remove air, then electrical insulation is improved, but system complexity increases
Solution Approach 1:
The deaeration lines are positioned at the highest points of the circulation system and utilize natural buoyancy and pressure differential to automatically remove air from the cooling liquid without requiring external power, control systems, or active components, allowing the system to self-regulate air removal
Solution Approach 2:
The deaeration function is merged into the existing cooling circulation system by integrating deaeration lines that follow the same coolant path, eliminating the need for separate air removal systems and reducing overall system complexity while maintaining electrical insulation reliability
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
The system effectively dissipates waste heat, maintains electrical insulation, and ensures efficient temperature control by removing air entrainment through the deaeration line, enhancing the cooling performance and reducing backpressure.
Implementation Method 1
a first circulation pump (6) for conveying the first cooling liquid (5) in the circulation system (4)
Implementation Method 2
a first heat exchanger (12) for dissipating heat from and/or supplying heat to the first cooling liquid (5) circulating in the circulation system (4)
Implementation Method 3
a second deaeration line (17) is provided, by means of which, given a normal orientation of the electrical traction machine (2) in the Earth's gravitational field (22), respective highest locations on the winding head regions (10, 11) are fluidically connected to one another
Data Source
AI summary
A cooling system for an electric traction machine, including a circulation system for guiding a first cooling liquid, a first circulation pump for conveying the first cooling liquid in the circulation system, and a motor inlet connection for fluidically connecting the circulation system on an inlet side to a first winding head region of an electric traction machine intended to be temperature-controlled. The cooling system includes a motor outlet connection for fluidically connecting the circulation system on an outlet side to a second winding head region of an electric traction machine intended to be temperature-controlled, and a first heat exchanger for dissipating heat from and/or supplying heat to the first cooling liquid. A plurality of cooling grooves are arranged between the winding head regions to guide the first cooling liquid. Respective highest locations on the winding head regions are fluidically connected to each other by a second deaeration line.