Electric Traction Machine Cooling Circuit With Coolant Degassing
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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 electrical insulation and minimizing air inclusions, which can degrade the thermal and electrical properties of dielectric coolants.
Innovation Solution
A cooling system for electric traction machines that includes a circuit system with a circulation pump, AC housing, motor connections, and a heat exchanger, utilizing a main line to connect the heat exchanger and AC housing, and vent lines to remove gas inclusions, along with a thermal management module integrating separate coolant and water circuits for comprehensive temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a dielectric coolant is used for direct cooling of the electric traction machine, then the cooling capacity is increased, but air inclusions in the coolant reduce electrical insulation and thermal capacity
Solution Approach 1:
The patent extracts and removes air inclusions from the coolant using a separation device that utilizes centrifugal force and gravity to separate gas bubbles from the dielectric coolant, ensuring the coolant maintains its electrical insulation properties while preserving cooling capacity
Solution Approach 2:
The patent introduces a separation device as an intermediary component in the cooling circuit that acts as a mediator between the coolant circulation and the electric traction machine, removing air inclusions before the coolant contacts the machine to maintain both cooling efficiency and electrical insulation
2Device complexity
If the coolant circuit is simplified to cool fewer components, then the device complexity is reduced, but air inclusions can more easily accumulate in the conduit system
Solution Approach 1:
The patent applies preliminary action by incorporating a separation device at the beginning of the cooling circuit that proactively removes air inclusions from the coolant before circulation begins or during operation, preventing air accumulation despite the simplified circuit design
Solution Approach 2:
The separation device enables the cooling system to self-service by automatically removing air inclusions from the coolant circulation without requiring external intervention, maintaining system reliability despite reduced complexity
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 minimizes air inclusions, ensuring efficient temperature control of components while using dielectric or non-dielectric coolants, thus enhancing the performance and reliability of the electric traction machine.
Implementation Method 1
a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant to be circulated in the circuit system
Implementation Method 2
a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant
Implementation Method 3
a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant to be circulated in the circuit system
Implementation Method 4
a first circulation pump for conveying the first coolant in the circuit system
Data Source
AI summary
A cooling system for an electric traction machine for a motor vehicle, including a circuit system for conducting a first coolant to be circulated, a first circulation pump for conveying the first coolant in the circuit system, an AC housing for an AC connection for the electric traction machine, and a motor inlet connection for fluidly connecting the circuit system on the input side to the electric traction machine to be temperature-controlled. The cooling system further includes a motor outlet connection for fluidly connecting the circuit system on the output side to the electric traction machine to be temperature-controlled, a first heat exchanger for dissipating heat from and/or supplying heat to the first coolant to be circulated in the circuit system, and a first main line, by which the first heat exchanger and the AC housing are fluidly connected to one another.