EPE Association: EPE 2022 - DS2m: Electric Drive Trains for On- and Off-Road Vehicles

EPE 2022 - DS2m: Electric Drive Trains for On- and Off-Road Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - DS2m: Electric Drive Trains for On- and Off-Road Vehicles

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   A Highly Integrated and Modular High Speed Electric Drive for Lightweight Electric Mountain Bikes
By Matthias HOFER [View]
[Download]

Abstract: In this work the application of a high-speed electric machine combined with a high gear ratio is investigated for a lightweight electric mountain bike. The proposed drive utilizes the high power density of high rotational speeds of electric machines to reach low system mass. The system integration and their components are described and compared to commercially available products. First experimental results of the proposed electric drive are presented.

   An artificial intelligence pipeline for critical equipment thermalconditioning system design
By Raik ORBAY [View]
[Download]

Abstract: Efficient electric machinery often need to be accurately thermally conditioned. Heat sinks and heatingsurfaces frequently used to allow for precise temperature control of critical equipment. To tacklethe thermal challenges in the art, different methodologies, such as the parametric or the topology optimization are introduced. Compared to parametric optimization, topology optimization allows for more tailored cooling solutions on intrigue geomteries related to propulsion. Being based on gradient descent algorithm from the machine learning toolbox, topology optimization may suffer from the susceptibility to be trapped in local minimums. In this approach the set up is designed to alleviate the risk for local minimums and instead aim for a more global optimization. For this purpose an artificial intelligence pipeline is scripted to run several gradient descent based topology optimization assessments under a genetic algorithm optimization loop. The resulting geometry shown to substantially improve the cooling ability in the given packaging volume in a light duty ground vehicle.

   Calculating the tractive power and power conversion efficiency of battery electric vehicles using a global navigation satellite system and a road elevation database
By Shinichi DOMAE [View]
[Download]

Abstract: The energy conversion efficiency of battery electric vehicles (BEVs), which is an essential index in the development of motor systems, remains unknown during real driving. This paper presents a calculation method of the tractive power and energy conversion efficiency of BEVs during driving. The progress of the global navigation satellite system (GNSS) and the widespread use of road elevation database enable a tractive power measurement during driving. We have developed the calculation method to evaluate an advanced motor-drive for BEVs under development without using chassis dynamometers. The calculation method showed almost the same energy conversion efficiencies on the three different routes. The results demonstrate the universality of the method and raise the possibility of benchmarking of the power conversion efficiency of any of various BEVs.

   Experimental study of a directly oil-cooled electrical machine for a full-electric vehicle by using low viscosity oil
By Huihui XU [View]
[Download]

Abstract: The thermal performance of an integrated electric drive unit, that consists of a directly oil-cooled electrical machine and a transmission, is experimentally studied. The cooling performance using two types of oil with different viscosities is analyzed with the help of empirical formulas and a lumped-parameter thermal model. The resulting thermal model with a single parameter set models the thermal behavior with the two different oil types. This approach allows the separate study of the drive unit and the oil performance with respect to different oil viscosities.

EPE 2022 - DS2m: Electric Drive Trains for On- and Off-Road Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - DS2m: Electric Drive Trains for On- and Off-Road Vehicles
	[return to parent folder]

	A Highly Integrated and Modular High Speed Electric Drive for Lightweight Electric Mountain Bikes By Matthias HOFER	[View] [Download]
Abstract: In this work the application of a high-speed electric machine combined with a high gear ratio is investigated for a lightweight electric mountain bike. The proposed drive utilizes the high power density of high rotational speeds of electric machines to reach low system mass. The system integration and their components are described and compared to commercially available products. First experimental results of the proposed electric drive are presented.

	An artificial intelligence pipeline for critical equipment thermalconditioning system design By Raik ORBAY	[View] [Download]
Abstract: Efficient electric machinery often need to be accurately thermally conditioned. Heat sinks and heatingsurfaces frequently used to allow for precise temperature control of critical equipment. To tacklethe thermal challenges in the art, different methodologies, such as the parametric or the topology optimization are introduced. Compared to parametric optimization, topology optimization allows for more tailored cooling solutions on intrigue geomteries related to propulsion. Being based on gradient descent algorithm from the machine learning toolbox, topology optimization may suffer from the susceptibility to be trapped in local minimums. In this approach the set up is designed to alleviate the risk for local minimums and instead aim for a more global optimization. For this purpose an artificial intelligence pipeline is scripted to run several gradient descent based topology optimization assessments under a genetic algorithm optimization loop. The resulting geometry shown to substantially improve the cooling ability in the given packaging volume in a light duty ground vehicle.

	Calculating the tractive power and power conversion efficiency of battery electric vehicles using a global navigation satellite system and a road elevation database By Shinichi DOMAE	[View] [Download]
Abstract: The energy conversion efficiency of battery electric vehicles (BEVs), which is an essential index in the development of motor systems, remains unknown during real driving. This paper presents a calculation method of the tractive power and energy conversion efficiency of BEVs during driving. The progress of the global navigation satellite system (GNSS) and the widespread use of road elevation database enable a tractive power measurement during driving. We have developed the calculation method to evaluate an advanced motor-drive for BEVs under development without using chassis dynamometers. The calculation method showed almost the same energy conversion efficiencies on the three different routes. The results demonstrate the universality of the method and raise the possibility of benchmarking of the power conversion efficiency of any of various BEVs.

	Experimental study of a directly oil-cooled electrical machine for a full-electric vehicle by using low viscosity oil By Huihui XU	[View] [Download]
Abstract: The thermal performance of an integrated electric drive unit, that consists of a directly oil-cooled electrical machine and a transmission, is experimentally studied. The cooling performance using two types of oil with different viscosities is analyzed with the help of empirical formulas and a lumped-parameter thermal model. The resulting thermal model with a single parameter set models the thermal behavior with the two different oil types. This approach allows the separate study of the drive unit and the oil performance with respect to different oil viscosities.