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Entwicklung einer Methodik zur systemischen Optimierung elektrischer Antriebseinheiten durch weiterentwickelte Kühlkonzepte und antriebsinternes Thermomanagement
Citation Link: https://doi.org/10.15480/882.8542
Publikationstyp
Doctoral Thesis
Date Issued
2023
Sprache
German
Author(s)
Advisor
Referee
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2023-06-08
Institute
TORE-DOI
Citation
Technische Universität Hamburg (2023)
The mobility sector is undergoing a radical change towards electromobility. This leads to increasing demands on the development of new electric powertrains of future electric vehicles.
The electric drive unit should be cost-effective, compact, durable and be as effcient as possible in all driving scenarios under different environmental conditions. With increasing complexity and component integration of the drive units, the influence of the thermal behavior of the components (electric motor, power electronics and transmission) and their mutual coupling increases.
Some of the components have strong divergent, optimal operating temperature ranges, which leads to opposite requirements for the drive unit cooling system. The cooling system and associated drive unit internal thermal management represent the interfaces between the components and offer additional possibilities to increase the effciency of the system. In order to develop the optimal overall concept of an electric drive unit for a vehicle platform, a systemic consideration of costs, effciency, mass and lifetime under compliance with installation space and limit temperatures for use in various vehicles is necessary.
Within the scope of this thesis, a methodology for the systemic evaluation of cooling concepts and thermal management measures of electric drive units is developed. The components the tool chain (thermal component models, cost models and transmission design models) as well as the thermal drive model are validated on the basis of various different measurements. The presented tool chain enables the evaluation and optimization of cooling concepts for electric drive units under consideration of different drive cycles. In order to assess the overall system under the above aspects a cost equivalent number approach based on vehicle-speci c properties is used. Furthermore, additional drive unit internal thermal management measures are evaluated and optimized in order to reduce energy consumption and at the same time provide the best drive unit solutions. The application possibilities of the tool chain are shown based on various parameter studies and optimizations.
The electric drive unit should be cost-effective, compact, durable and be as effcient as possible in all driving scenarios under different environmental conditions. With increasing complexity and component integration of the drive units, the influence of the thermal behavior of the components (electric motor, power electronics and transmission) and their mutual coupling increases.
Some of the components have strong divergent, optimal operating temperature ranges, which leads to opposite requirements for the drive unit cooling system. The cooling system and associated drive unit internal thermal management represent the interfaces between the components and offer additional possibilities to increase the effciency of the system. In order to develop the optimal overall concept of an electric drive unit for a vehicle platform, a systemic consideration of costs, effciency, mass and lifetime under compliance with installation space and limit temperatures for use in various vehicles is necessary.
Within the scope of this thesis, a methodology for the systemic evaluation of cooling concepts and thermal management measures of electric drive units is developed. The components the tool chain (thermal component models, cost models and transmission design models) as well as the thermal drive model are validated on the basis of various different measurements. The presented tool chain enables the evaluation and optimization of cooling concepts for electric drive units under consideration of different drive cycles. In order to assess the overall system under the above aspects a cost equivalent number approach based on vehicle-speci c properties is used. Furthermore, additional drive unit internal thermal management measures are evaluated and optimized in order to reduce energy consumption and at the same time provide the best drive unit solutions. The application possibilities of the tool chain are shown based on various parameter studies and optimizations.
Subjects
electric traction motor
cooling
battery electric vehicle
electric drive unit
thermal simulation
optimization
DDC Class
600: Technology
620: Engineering
Publication version
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Gronwald_Peer-Ole_Steffen_Entwicklung_einer_Methodik_zur_systematischen_Optimierung_elektrischer_Antriebseinheiten.pdf
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