A Study on the Rotor Design of Line Start Synchronous Reluctance Motor for IE4 Efficiency and Improving Power Factor

As international regulations of motor efficiency are strengthened, the line-start synchronous reluctance motor (LS-SynRM) is being studied to improve the efficiency of the electrical motor in industrial applications. However, in industrial applications, the power factor is also an important performance index, but the LS-SynRM has poor power factor due to the saliency characteristic. In this paper, the rotor design of LS-SynRM is performed to improve the efficiency and power factor. First, the barrier design is performed to improve the efficiency and power factor using the response surface method (RSM). Second, the rotor slot design is performed according to the length of bar for synchronization. Lastly, the rib design is performed to satisfy the power factor and the mechanical reliability. The final model through the design process is analyzed using finite element analysis (FEA), and the objective performance is satisfied. To verify the FEA result, the final model is manufactured, and experiment is performed.

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Study on Line-Start Permanent Magnet Assistance Synchronous Reluctance Motor for Improving Efficiency and Power Factor

Energies ◽

10.3390/en13020384 ◽

2020 ◽

Vol 13 (2) ◽

pp. 384 ◽

Cited By ~ 2

Author(s):

Hyunwoo Kim ◽

Yeji Park ◽

Huai-Cong Liu ◽

Pil-Wan Han ◽

Ju Lee

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Permanent Magnet ◽

Power Factor ◽

Permanent Magnets ◽

Electric Motors ◽

Element Analysis ◽

Final Model ◽

Synchronous Reluctance Motor ◽

Reluctance Motor

In order to improve the efficiency, a line-start synchronous reluctance motor (LS-SynRM) is studied as an alternative to an induction motor (IM). However, because of the saliency characteristic of SynRM, LS-SynRM have a limited power factor. Therefore, to improve the efficiency and power factor of electric motors, we propose a line-start permanent magnet assistance synchronous reluctance motor (LS-PMA-SynRM) with permanent magnets inserted into LS-SynRM. IM and LS-SynRM are selected as reference models, whose performances are analyzed and compared with that of LS-PMA-SynRM using a finite element analysis. The performance of LS-PMA-SynRM is analyzed considering the position and length of its permanent magnet, as well as its manufacture. The final model of LS-PMA-SynRM is designed for improving the efficiency and power factor of electric motors compared with LS-SynRM. To verify the finite element analysis (FEA) result, the final model is manufactured, experiments are conducted, and the performance of LS-PMA-SynRM is verified.

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Synchronous Reluctance Motor vs. Induction Motor at Low-Power Industrial Applications: Design and Comparison

Energies ◽

10.3390/en12112190 ◽

2019 ◽

Vol 12 (11) ◽

pp. 2190 ◽

Cited By ~ 4

Author(s):

Nezih Gokhan Ozcelik ◽

Ugur Emre Dogru ◽

Murat Imeryuz ◽

Lale T. Ergene

Keyword(s):

Low Power ◽

Permanent Magnet ◽

Induction Motors ◽

Power Level ◽

Industrial Applications ◽

Permanent Magnet Motors ◽

Element Analysis ◽

Synchronous Reluctance Motor ◽

Three Phase ◽

Reluctance Motor

Although three-phase induction motors are the most common motor type in industry, a growing interest has arisen in emerging electric motor technologies like synchronous reluctance motors and permanent magnet motors. Synchronous reluctance motors are a step forward compared to permanent magnet motors when the cost of the system is considered. The main focus of this study is low-power industrial applications, which generally use three-phase induction motors. In this study, the synchronous reluctance motor family is compared at three different power levels: 2.2 kW, 4 kW, and 5.5 kW. The aim of this study is to design and compare synchronous reluctance motors, which can be alternative to the reference induction motors. Finite element analysis is performed for the reference induction motors initially. Their stators are kept the same and the rotors are redesigned to satisfy output power requirements of the induction motors. Detailed design, analysis, and optimization processes are applied to the synchronous reluctance motors considering efficiency, power density, and manufacturing. The results are evaluated, and the optimized designs are chosen for each power level. They are prototyped and tested to measure their performance.

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