Electrical Machines
Seyed Reza Mousavi-aghdam; Seyed Abbas Azimi; Farzad Sedaghati
Abstract
Background and Objectives: Synchronous reluctance motors (SynRMs) have considered as energy-efficient alternatives to conventional induction motors (IMs), primarily due to high efficiency. Despite their low losses, SynRMs are hindered by inadequate line-start capability and a low power factor, which ...
Read More
Background and Objectives: Synchronous reluctance motors (SynRMs) have considered as energy-efficient alternatives to conventional induction motors (IMs), primarily due to high efficiency. Despite their low losses, SynRMs are hindered by inadequate line-start capability and a low power factor, which restrict their use in industrial settings. This article addresses these limitations by introducing a line-start permanent magnet-assisted SynRM (LS-PMaSynRM) that incorporates fluid-type flux barriers. This design aims to enhance starting performance and increasing power factor.Methods: The design process entailed a parametric sensitivity analysis of critical motor characteristics, including rotor geometry, stator winding configuration, and stator slot count. Finite Element Method (FEM) simulations were executed using time-stepping analysis to assess the motor's electromagnetic behavior under both transient and steady-state conditions. Performance metrics such as torque ripple, average torque, efficiency, and power factor were evaluated. Comparative simulations with conventional SynRM and PMaSynRM designs were also conducted to benchmark improvements.Results: The proposed LS-PMaSynRM exhibited substantial enhancements in line-start capability, achieving stable synchronization within a brief period. The motor demonstrated a significant increase in power factor relative to conventional SynRM designs, while maintaining high efficiency throughout the operating range.Conclusion: The study presents an LS-PMaSynRM architecture that effectively addresses traditional limitations in line-start performance and power factor. These findings support the broader industrial adoption of SynRMs and offer a practical design pathway for future high-efficiency motor applications.
Electronics
M. Feli; F. Parandin
Abstract
Background and Objectives: Solar cell is an electronic device which harvest photovoltaic effect and transform light energy to electricity. An efficient double junction InGaN/CIGS solar cell can be simulated using Silvaco ATLAS software. In this study, a thin CdS top cover layer is used as the anti-reflector ...
Read More
Background and Objectives: Solar cell is an electronic device which harvest photovoltaic effect and transform light energy to electricity. An efficient double junction InGaN/CIGS solar cell can be simulated using Silvaco ATLAS software. In this study, a thin CdS top cover layer is used as the anti-reflector layer. Methods: To reach the current matching condition, changing the thickness of this CdS layer, we can enhance the short-circuit currents of both the top and bottom cells. To gain a desired efficiency, different design parameters, such as the doping concentrations and the thicknesses of the various layers of the cell are optimized. This cell is designed to be used in a real environmental situation. Results: By using the appropriate parameters, and under matching conditions, the efficiency is optimized as well as the filling factor is increased. Considering the proposed structure and the simulation results, an optimum efficiency of 41.87% is achieved and also the obtained fill factor is equal to 75.16%. Conclusion: In this paper, a new structure for an efficient double junction InGaN/CIGS solar cell, was proposed. In our proposed structure, a thin CdS layer is used as the anti-reflector layer. To get a desired efficiency, different design parameters, such as the doping concentrations and the thicknesses of various layers of the cells were optimized. ======================================================================================================Copyrights©2018 The author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, as long as the original authors and source are cited. No permission is required from the authors or the publishers.======================================================================================================
S.M. Ahmadi; F. Parandin
Abstract
A solar cell is an electronic device which not only harvests photovoltaic effect but also transforms light energy into electricity. In photovoltaic phenomenon, a P-N junction is created to form an empty region. The presented paper aims at proposing a new highly efficient InGaN/Si double-junction ...
Read More
A solar cell is an electronic device which not only harvests photovoltaic effect but also transforms light energy into electricity. In photovoltaic phenomenon, a P-N junction is created to form an empty region. The presented paper aims at proposing a new highly efficient InGaN/Si double-junction solar cell structure. This cell is designed to be used in a real environmental situation, so only structural parameters are optimized. In the present structure, a thin layer of Cd-S is used as the anti-reflector window layer. The cell is simulated using ATLAS-SILVACO software and its maximum efficiency is computed to be 37.23%. Considering the supposed structure, the findings show that the efficiency of this solar cell, which is 37.32%, is so far the highest reported efficiency amongst all solar cells.
