Optimal Design of Line-Start Permanent Magnet Synchronous Motor Based on Magnetic Equivalent Parameters
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ORIGINAL ARTICLE
Optimal Design of Line‑Start Permanent Magnet Synchronous Motor Based on Magnetic Equivalent Parameters Abdul Waheed2 · Byongkuk Kim1 · Yun‑Hyun Cho2 Received: 16 January 2020 / Revised: 13 May 2020 / Accepted: 29 May 2020 © The Korean Institute of Electrical Engineers 2020
Abstract This paper used a lumped magnetic parametric approach-based analytical technique to design the 7.5 kW, three-phase line start permanent magnet (LSPM) motor. In order to enhance the efficiency and power factor (PF) of the prototype LSPM machine, an optimized slot shape of rotor permanent magnet (PM) was selected. The lumped magnetic circuit model is developed to present the magnetic characteristics, and analytical expressions are derived under the open circuit condition. The impact of the design variables on the analytical model air gap flux density distribution and magnetic flux leakage is studied for the LSPM. The design variables have a significant influence on the steady-state performance characteristics of the LSPM motor. Therefore, to verify the output results of the purposed model, the two-dimensional finite element analysis (FEA) was evaluated for the numerical solution of the analytical model. Keywords Air-gap flux density · Demagnetization analysis · Lumped magnetic circuit · Parametric study · Rotor design
1 Introduction In the twenty-first century, the increasing energy crises arising from the depleted hydrocarbon and global warming issues and subsequently energy saving demands have been continuously increasing. These economic and environmental problems can be addressed by developing a highly efficient electric motor used for the most significant energy consumption in the industry. Line-start permanent magnet (LSPM) synchronous motor, as a prominent motor, is used in various applications because of its high technical advantages and low cost compared with the induction motors because they can be designed to be smaller than the same output power. For this purpose, Line-operated induction motor (IM) is being replaced by line start permanent magnet (LSPM) * Yun‑Hyun Cho [email protected] Abdul Waheed [email protected] Byongkuk Kim [email protected] 1
VGM Company, 196 Jukdong‑gil, Gangseo‑gu, 182‑23 Busan, South Korea
Department of Electrical Engineering, Dong-A University, 840 Hadan 2 dong, Saha‑gu, 604‑714 Busan, South Korea
2
synchronous motor in industrial and academic applications because of its high efficiency and power factor regardless of the load variations. Squirrel cage helps the LSPM to start with the conventional AC source. The LSPM motor operates at a constant speed and the permanent magnet (PM) buried under the cage in the rotor provides reluctance torque generated by the difference in magnetic resistance [1, 2]. The PM segments under the rotor bars help the LSPM motor to operate as a synchronous motor in the steady-state condition. Thus, it integrates the advantages of interior permanent magnet (IPM) synchronous motor (high torque density, efficiency and PF) and IM (line st
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