Line-Start Permanent Magnet Synchronous Motors: Evolution, Challenges, and Industrial Prospects

Yahia Ould Lahoucine (), Reiko Raute () and Cedric Caruana
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Yahia Ould Lahoucine: Department of Electrical Engineering, Faculty of Engineering, University of Malta, Msida Campus (Main Campus), MSD 2080 Msida, Malta
Reiko Raute: Department of Electrical Engineering, Faculty of Engineering, University of Malta, Msida Campus (Main Campus), MSD 2080 Msida, Malta
Cedric Caruana: Department of Electrical Engineering, Faculty of Engineering, University of Malta, Msida Campus (Main Campus), MSD 2080 Msida, Malta

Energies, 2025, vol. 18, issue 17, 1-35

Abstract: Line-Start Permanent Magnet Synchronous Motors (LSPMSMs) offer a hybrid solution that combines the high efficiency of permanent magnet motors with the self-starting capability of induction machines. This review examines their key performance characteristics, historical development, and design approaches. Advantages such as high efficiency, improved power factor, and operational stability are discussed alongside challenges like limited critical inertia and synchronization issues. Design enhancements through rotor topology optimization and cage resistance adjustment are also explored. Finally, market trends and economic considerations are evaluated, highlighting the strong potential of LSPMSMs in energy-efficient motor applications.

Keywords: line-start motors; permanent magnet; energy saving; efficiency; synchronous motors; induction motors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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