The Yokeless Dual Rotor Electrically Excited Synchronous Machine

Zürrlein T, Liu X, Baader M, Risch F (2025)

Publication Type: Conference contribution

Publication year: 2025

Publisher: Institute of Electrical and Electronics Engineers Inc.

Pages Range: 659-666

Conference Proceedings Title: 2025 IEEE International Electric Machines & Drives Conference (IEMDC)

Event location: Houston, TX US

ISBN: 9798350376593

DOI: 10.1109/IEMDC60492.2025.11061137

Abstract

This paper presents an innovative concept for the electrically excited synchronous machine (EESM), which combines the advantages of conventional EESMs with those of yokeless dual rotor machines. The proposed yokeless dual rotor electrically excited synchronous machine (YDR-EESM) achieves high torque density through a large effective air gap area and the absence of a stator yoke, but in contrast to the popular yokeless and segmented armature (YASA) machine it is expected to offer greater mechanical stiffness due to its rotor design and simplified manufacturing due to the radial flux path. In addition, the YDR-EESM avoids the use of permanent magnets (PMs), which enables greater efficiency in the field weakening range and allows a wide constant power speed range by controlling the excitation current. The YDR-EESM is analyzed using finite element analysis (FEA) and compared to a conventional EESM in terms of power and torque density. Finally, the mechanical structure and possible cooling concepts of the machine are discussed.

Authors with CRIS profile

Tobias Zürrlein Lehrstuhl für Fertigungsautomatisierung und Produktionssystematik (FAPS) Marcel Baader Lehrstuhl für Fertigungsautomatisierung und Produktionssystematik (FAPS) Florian Risch Lehrstuhl für Fertigungsautomatisierung und Produktionssystematik (FAPS)

Involved external institutions

Fraunhofer-Institut für Integrierte Systeme und Bauelementetechnologie (IISB) DE Germany (DE)

How to cite

APA:

Zürrlein, T., Liu, X., Baader, M., & Risch, F. (2025). The Yokeless Dual Rotor Electrically Excited Synchronous Machine. In 2025 IEEE International Electric Machines & Drives Conference (IEMDC) (pp. 659-666). Houston, TX, US: Institute of Electrical and Electronics Engineers Inc..

MLA:

Zürrlein, Tobias, et al. "The Yokeless Dual Rotor Electrically Excited Synchronous Machine." Proceedings of the IEEE International Electric Machines & Drives Conference (IEMDC), Houston, TX Institute of Electrical and Electronics Engineers Inc., 2025. 659-666.

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