Analysis of Thermal Management of Electric Motors · Analysis of Thermal Management of Electric...
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Analysis of Thermal Management of Electric Motors
Joshua EhiziboloPrince George’s Community CollegePI: Dr. Satish KumarMentor: Nitish KumarJune – August 2019
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Introduction
Credit: Rupchandra; kisspng.com
• Electric vehicles (EVs) are important in reaching a sustainable environment. • Research shows that their capacity is limited due to temperature rise in the
motor [1].• My project focused on thermal management of the BMW i3 motor, involving
computational modeling, analyzing thermal profiles, and exploring options for better thermal management.
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The Motor Assembly
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Credits: Burns/Wikimedia CommonsCredits: Saveonenergy.com
StatorRotor
StatorRotor
Motor
How a Motor Works
Current
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Note: Colors are only meant for visual appeal
StatorStator windings or coils
Air Gap
Magnets
Rotor
3D model of Motor in ANSYS (30o section) & SolidWorks
Stator
Rotor
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Spiral Cooling Channel
Traditionally, motors are cooled externally using a cooling jacket.
Cooling Method
Motor
Front View of BMW i3 Motor in MotorCAD
External Coolant Flow
The BMW i3 Cooling JacketCoolant Flow
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Thermal Profile
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ANSYS
Numerical Analysis using Finite Volume Method2
• Division of geometry (domain) into control volumes
• Integration of heat transfer and energy equations on the individual control volumes
• Linearization of the equations and solutions
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• The highest heat generation was in the stator’s windings.
• It reached over 300K for 3 x 106 W/m3K.
Thermal Analysis of
Motor
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Thermal Analysis of CoilsUsing 3×106 W/m3K | Max temp. in coil is 352 K | Min temp is 322.8 K
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Proposed Thermal Management
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Internal Thin Air Gaps around Stator Windings
Proposed Cooling Method
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Internal Fluid Flow
Proposed Cooling Channel
Front View of BMW i3 Motor in MotorCAD
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• Obtaining official dimensions of the BMW Motor
• Issues with the ANSYS software
Setbacks
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• Use Novec 3M Fluids 649 and 7300 as coolants
• Test other heat fluids for thermal management
• Compare with other methods of analysis
• Analyze motors of other EVs
Future Work
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• NSF EEC-1757579• Georgia Tech and IEN• Dr. Satish Kumar
• Nitish Kumar
• Leslie O’Neill and Dr. Quinn Spadola
Acknowledgements
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[1] Zabdur Rehman & Kwanjae Seong, 2018; “Three-D Numerical Thermal Analysis of Electric Motor with Cooling Jacket”, Energies, MDPI, Open Access Journal, vol. 11(1), pages 1-15.
[2] S. Ali et. al, “CFD & ANSYS FLUENT,” LinkedIn SlideShare, 10-Sep-2016. [Online]. Available: https://www.slideshare.net/muhammadshujan/cfd-ansys-fluent.
Reference
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QUESTIONS?