Thermal modeling and drivetrain-loss study for thermal management of electric machines. Utilizing powertrain heat for better performance in cold conditions
| dc.contributor.author | Rosén, Filip | |
| dc.contributor.author | Tyrbo, Maja | |
| dc.contributor.department | Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper | sv |
| dc.contributor.department | Chalmers University of Technology / Department of Mechanics and Maritime Sciences | en |
| dc.contributor.examiner | Sedarsky, David | |
| dc.contributor.supervisor | Larsson, Johan | |
| dc.date.accessioned | 2023-10-26T09:17:06Z | |
| dc.date.available | 2023-10-26T09:17:06Z | |
| dc.date.issued | 2023 | |
| dc.date.submitted | 2023 | |
| dc.description.abstract | The number of battery electric vehicles, BEVs, are increasing as the transportation sector is moving towards a more sustainable future with zero emissions. An issue with BEVs compared to conventional vehicles is their shorter range. To achieve higher efficiency and thereby longer range, every system on the vehicle must be optimised. This thesis has considered the thermal management system, cabin heating in cold conditions, and the utilization of heat losses from the electric drive unit, EDU. To understand the benefit of an EDU loss-mode, i.e. operating with higher losses than nominal to create more heat, a thermal model of the electric machine was built. The thermal model is a lumped-parameter model capable of predicting the temperature of critical components, which enables over-loading analysis to ensure that the thermal capability of the machine is not exceeded. The model is parameterized only by dimensions and material data, and can be easily customized to new motor types. Verification with steady-state and WLTC test data showed good trend correlation and within the expected accuracy of 30%. A vehicle-level thermal management model was built to implement and utilize heat losses from the electric drive unit. Simulations with an ambient temperature of -10°C and heating the cabin to 20°C were performed with EDU heat losses. Simulations with motor preheating was also performed. Reduction of energy consumption for cabin heating was found to be approximately 7% when utilizing drive unit heat losses. Motor preheating reduced cabin heating consumption further, but used more energy over-all and was not found efficient. | |
| dc.identifier.coursecode | MMSX30 | |
| dc.identifier.uri | http://hdl.handle.net/20.500.12380/307266 | |
| dc.language.iso | eng | |
| dc.setspec.uppsok | Technology | |
| dc.subject | thermal management | |
| dc.subject | battery electric vehicle | |
| dc.subject | lumped parameter thermal network | |
| dc.subject | heat loss utilization | |
| dc.subject | thermal simulation electric machines | |
| dc.subject | electric machine thermal modeling | |
| dc.title | Thermal modeling and drivetrain-loss study for thermal management of electric machines. Utilizing powertrain heat for better performance in cold conditions | |
| dc.type.degree | Examensarbete för masterexamen | sv |
| dc.type.degree | Master's Thesis | en |
| dc.type.uppsok | H | |
| local.programme | Mobility engineering (MPMOB), MSc |