Fast Sizing Tool and Optimization Technique for Concentrated Wound Slotless Outer Rotor Motor for eVTOL Application

Dave, Nisarg; Gerada, David; Vakil, Gaurang; Zhang, He; Shi, Bowen; Zhang, Fengyu; Li, Jing; Gerada, Chris

doi:10.1109/ICEM51905.2022.9910584

Authors

NISARG DAVE Nisarg.Dave2@nottingham.ac.uk
Ktp Associate - Electrical Machine Research Engineer

DAVID GERADA D.Gerada@nottingham.ac.uk
Principal Research Fellow in Electrical Machines

GAURANG VAKIL GAURANG.VAKIL@NOTTINGHAM.AC.UK
Associate Professor

He Zhang

Bowen Shi

FENGYU ZHANG FENGYU.ZHANG1@NOTTINGHAM.AC.UK
Senior Research Fellow

Jing Li

CHRISTOPHER GERADA CHRIS.GERADA@NOTTINGHAM.AC.UK
Professor of Electrical Machines

Abstract

This paper aims to present the feasibility and advantages of slotless motors for electric aircraft applications. Currently, eVTOL (electric vertical takeoff and landing) aircraft are equipped with a slotted motor with concentrated windings and an outer rotor with strong magnets. Slotless machines with Halbach array can offer significant advantages over traditional slotted machines. Instead of using the round conductor, this paper is focused on the slotless coils made up of stranded copper strips, which leads to a low inductance machine. Furthermore, employing a drive made up of wide bandgap semiconductors enables slotless technology. The paper presents analytical modelling of the slotless machine and compares different groupings of the concentrated winding for the same number of poles. This analytical model is coupled with the optimization tool to find the most power-dense design, and these designs are validated with the commercially available FEA software to demonstrate the accuracy of the proposed method.

Citation

Dave, N., Gerada, D., Vakil, G., Zhang, H., Shi, B., Zhang, F., …Gerada, C. (2022). Fast Sizing Tool and Optimization Technique for Concentrated Wound Slotless Outer Rotor Motor for eVTOL Application. In 2022 International Conference on Electrical Machines (ICEM) (2094-2099). https://doi.org/10.1109/ICEM51905.2022.9910584

Conference Name	2022 International Conference on Electrical Machines (ICEM)
Conference Location	Valencia, Spain
Start Date	Sep 5, 2022
End Date	Sep 8, 2022
Acceptance Date	Jan 6, 2022
Online Publication Date	Oct 13, 2022
Publication Date	Sep 5, 2022
Deposit Date	Feb 21, 2023
Publicly Available Date	Feb 21, 2023
Publisher	Institute of Electrical and Electronics Engineers
Pages	2094-2099
Book Title	2022 International Conference on Electrical Machines (ICEM)
ISBN	978-1-6654-1433-3
DOI	https://doi.org/10.1109/ICEM51905.2022.9910584
Public URL	https://nottingham-repository.worktribe.com/output/12888233
Publisher URL	https://ieeexplore.ieee.org/document/9910584