Axial flux machines offer an inherent torque density advantage over conventional radial flux machines and are increasingly being considered for transportation electrification applications. Electrification of off-highway vehicles is notoriously challenging due to extreme power density requirements. This paper investigates the use of axial flux machines for off-highway vehicle electrification. To maximize the power density, a hydraulic pump is integrated with the axial flux machine, resulting in a single modular, electric/hydraulic machine. This paper first compares three popular axial flux machine variants using an FEA-based design optimization approach. The single rotor, single stator variant is identified to be the most promising for integration with the hydraulic pump. Next, a multi-physics framework of the complete integrated hydraulic pump and axial flux machine is developed to search the design space. The results indicate promising potential for this concept to realize efficiency over 85% and power density over 5kW/kg for the complete machine (electric machine, hydraulic pump, and thermal management system), while utilizing conventional materials (thin gauge silicon steel, N45 magnets, and magnet wire).
|Original language||English (US)|
|Title of host publication||ECCE 2020 - IEEE Energy Conversion Congress and Exposition|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||8|
|State||Published - Oct 11 2020|
|Event||12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 - Virtual, Detroit, United States|
Duration: Oct 11 2020 → Oct 15 2020
|Name||ECCE 2020 - IEEE Energy Conversion Congress and Exposition|
|Conference||12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020|
|Period||10/11/20 → 10/15/20|
Bibliographical noteFunding Information:
This material is based upon work supported by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy (EERE) under the Award Number DE-EE0008384. Electromagnetic simulation tools used in this investigation were generously provided by Mentor Graphics, a Siemens business.
© 2020 IEEE.
- Axial flux motor
- Electric-hydraulic conversion
- Machine design
- Multi-objective optimization
- Multi-physics optimization
- Off-highway vehicle electrification