Rotor Design of a Line-Start Synchronous Reluctance Machine with Respect to Induction Machine for Industrial Applications
Paper i proceeding, 2018

This paper introduces a unique rotor design for line-start synchronous reluctance machines. Efficiency and synchronization capability are determined and a comparison between line-start synchronous reluctance machines and induction machines is drawn. For the design and simulation, FEM calculations were used and the results were experimentally verified. Within the frame of this paper a 4 kW rated induction machine with an efficiency class rating of IE3 was chosen as a benchmark motor. The new rotor-cage design of the line start reluctance machine decreases the motor losses at steady state by about 28%. This promising approach could be used to upgrade induction machines in industry environments instead of replacing them. Nevertheless, a challenge in the design is a good balance between the steady state performance and synchronization capability, whereby the range of industrial applications is limited for high efficient line-start synchronous reluctance machines.

Synchronous reluctance machine (SynRM)

Induction machine (IM)

Flux barrier

Direct-on-line (DOL) start

Line start


Finite element method (FEM)



Anton Kersten

Chalmers, Elektroteknik, Elkraftteknik

Yujing Liu

Chalmers, Elektroteknik, Elkraftteknik

Daniel Pehrman

Chalmers, Elektroteknik, Elkraftteknik

Proceedings - 2018 23rd International Conference on Electrical Machines, ICEM 2018

Vol. 24 October 2018 393-399 8507053
978-153862477-7 (ISBN)

ICEM 2018
Alexandroupoli, Greece,


Annan elektroteknik och elektronik



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