Design of a Boomerang-Type Rotor for Achieving IE4 Efficiency in a 37 kW LS-SynRM

Choung-Seo Kim, Chan-Bae Park, Jae-Bum Lee, Seong-Hwi Kim and Hyung-Woo Lee ()
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Choung-Seo Kim: Department of Railroad Convergence System, Korea National University of Transportation, Uiwang-si 16106, Republic of Korea
Chan-Bae Park: Department of Railroad Convergence System, Korea National University of Transportation, Uiwang-si 16106, Republic of Korea
Jae-Bum Lee: Department of Railroad Electric Engineering, Korea National University of Transportation, Uiwang-si 16106, Republic of Korea
Seong-Hwi Kim: Department of Electric Engineering, Hanyang University, Seoul 04763, Republic of Korea
Hyung-Woo Lee: Department of Railroad Convergence System, Korea National University of Transportation, Uiwang-si 16106, Republic of Korea

Energies, 2025, vol. 18, issue 20, 1-23

Abstract: Motors are among the most energy-consuming devices worldwide. With growing interest in eco-friendly solutions, minimum efficiency regulations for industrial motors are being enforced. In response to continuously rising minimum efficiency requirements, research on improving the efficiency of motors is actively underway. In the case of induction motors, which are the most widely used industrial electric motors, rotor ohmic loss occurs due to their operating characteristics. In contrast, line-start synchronous reluctance motors (LS-SynRMs) have a significant advantage in efficiency because once they reach synchronous speed, no eddy currents are generated by the fundamental current waveform. This leads to a sharp decrease in rotor ohmic losses, greatly enhancing efficiency. In this paper, a rotor design is carried out to improve the efficiency of LS-SynRMs. To support the rotor design, the torque characteristics of LS-SynRMs were analyzed under both asynchronous and synchronous state operations, and improvement directions for enhancing efficiency were identified. For rotor type selection, two bar-type rotors with linear flux barriers and two boomerang-type rotors with curved flux barriers were designed. The electromagnetic characteristics of these designs were compared using finite element analysis. Among them, the boomerang-type rotor that exhibited the best electromagnetic performance was selected as the final rotor type. Its final geometry was derived through detailed design, considering the mechanical safety of the rotor. Finally, experimental validation was conducted to verify the effectiveness of the proposed rotor design.

Keywords: line-start synchronous reluctance motor; minimum energy performance standard; efficiency improvement (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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