TY - GEN

T1 - First Step to Optimum Rotor Design for E-Motors with High Power Density for Aircraft Propulsion

AU - Keuter, Ralf Johannes

AU - Ponick, Bernd

N1 - Funding Information: We would like to acknowledge the funding from the Deutsche Forschungs-gemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC 2163/1 Sustainable and Energy Efficient Aviation Project ID 390881007.

PY - 2022

Y1 - 2022

N2 - To meet the challenge of all-electric flight, e-motors with particularly high power density are necessary, PM synchronous machines being a preferable motor type. The rotor of an e-motor is a key factor determining its characteristics and thus also its power density. There is a wide range of rotor topologies with an even wider range of parameters to choose from. Since flux density directly affects torque generation, the idea is to determine which rotor topology achieves the best main spatial harmonic flux density to rotor weight ratio. For this purpose, a multiobjective genetic algorithm was used, which finds the best solutions in sufficient time despite the large parameter range. The evaluation of about 25000 results shows that surface mounted configurations such as traditional surface magnets or a Halbach-Array configuration provide good solutions. However, for a high torque, high current density approach, spoke-type magnets are the best, since they have advantages in terms of demagnetization. For a high-speed, low pole pair approach, V-shaped buried magnets seem to lead to the best solution. The presented approach provides a possibility to perform a pre-selection of rotor topologies, but requires more detailed application-specific investigations.

AB - To meet the challenge of all-electric flight, e-motors with particularly high power density are necessary, PM synchronous machines being a preferable motor type. The rotor of an e-motor is a key factor determining its characteristics and thus also its power density. There is a wide range of rotor topologies with an even wider range of parameters to choose from. Since flux density directly affects torque generation, the idea is to determine which rotor topology achieves the best main spatial harmonic flux density to rotor weight ratio. For this purpose, a multiobjective genetic algorithm was used, which finds the best solutions in sufficient time despite the large parameter range. The evaluation of about 25000 results shows that surface mounted configurations such as traditional surface magnets or a Halbach-Array configuration provide good solutions. However, for a high torque, high current density approach, spoke-type magnets are the best, since they have advantages in terms of demagnetization. For a high-speed, low pole pair approach, V-shaped buried magnets seem to lead to the best solution. The presented approach provides a possibility to perform a pre-selection of rotor topologies, but requires more detailed application-specific investigations.

KW - Aicraft propulsion

KW - all-electric aircraft

KW - multiobjectiv genetic algorithm

KW - permanent-magnet synchronous machine (PMSM)

KW - rotor design

UR - http://www.scopus.com/inward/record.url?scp=85146323237&partnerID=8YFLogxK

U2 - 10.1109/ICEMS56177.2022.9982946

DO - 10.1109/ICEMS56177.2022.9982946

M3 - Conference contribution

AN - SCOPUS:85146323237

SN - 9781665493031

T3 - 2022 International Conference on Electrical Machines and Systems, ICEMS 2022

BT - 2022 International Conference on Electrical Machines and Systems, ICEMS 2022

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 25th International Conference on Electrical Machines and Systems, ICEMS 2022

Y2 - 29 November 2022 through 2 December 2022

ER -