Abstract
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.
Highlights
In industrial applications, electrical energy consumption of motors account for 35% to 40%of electrical energy generated in the world
During the die-casting process, a high press is applied to the rotor slot so that the melted aluminum is injected in the rotor slot
LS-SynRM is designed considering the mechanical reliability for use in the industrial application
Summary
Electrical energy consumption of motors account for 35% to 40%. If the reactive power is increased by the low power factor, the copper loss in stator winding increases under the same output power and input voltage condition because of the current increases [20] This increased copper loss decreases the efficiency of the electrical motor. For this reason, there are the power factor standards of industrial motors, according to IEC 60034. The electrical motor must meet the power factor standards to use industrial applications [21]. This paper is a design process of LS-SynRM, for super premium efficiency, and for improving the power factor. The efficiency and the power factor of LS-SynRM is determined by dq-axis inductance, which is determined by the barrier design.
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