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Five-phase Synchronous Reluctance Machines Equipped with a Novel Type of Fractional Slot Winding

CES Transactions on Electrical Machines and Systems 2024年第3期 264-273页

作者： Seyed Mahdiar Taghavi Araghi Arash Kiyoumarsi behzad mirzaeian dehkordi Department of Electrical Engineering Faculty of Engineering University of Isfahan

—Multi-phase machines are so attractive for electrical machine designers because of their valuable advantages such as high reliability and fault tolerant ability. Meanwhile, fractional slot concentrated windings(FSCW) are well known because of short end winding length, simple structure, field weakening sufficiency, fault tolerant capability and higher slot fill factor. The five-phase machines equipped with FSCW, are very good candidates for the purpose of designing motors for high reliable applications, like electric cars, major transporting buses, high speed trains and massive trucks. But, in comparison to the general distributed windings, the FSCWs contain high magnetomotive force(MMF) space harmonic contents, which cause unwanted effects on the machine ability, such as localized iron saturation and core losses. This manuscript introduces several new five-phase fractional slot winding layouts, by the means of slot shifting concept in order to design the new types of synchronous reluctance motors(SynRels). In order to examine the proposed winding's performances, three sample machines are designed as case studies, and analytical study and finite element analysis(FEA) is used for validation.

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NUMERICAL SIMULATION OF FLOW OVER TWO CIRCULAR CYLINDERS IN TANDEM ARRANGEMENT

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Journal of Hydrodynamics 2011年第1期23卷 114-126页

作者： dehkordi behzad Ghadiri MOGHADDAM Hesam Sarvghad JAFARI Hamed Houri Department of Mechanical Engineering School of EngineeringTarbiat Modares University

In this article,the 2-D unsteady viscous flow around two circular cylinders in a tandem arrangement is numerically simulated in order to study the characteristics of the flow in both laminar and turbulent *** method applied alternatively is based on the finite volume method on a Cartesian-staggered *** great source term technique is employed to identify the cylinders placed in the flow *** apply the boundary conditions,the ghost-cell technique is *** implemented computational method is firstly validated through simulation of laminar and turbulent flows around a fixed circular ***,the flow around two circular cylinders in a tandem arrangement is simulated and *** flow visualization parameters,the Strouhal numbers,and drag and lift coefficients are comprehensively presented and compared for different cases in order to reveal the effect of the Reynolds number and gap spacing on the behavior of the *** obtained results have shown two completely distinct flow characteristics in laminar and turbulent regimes.

关键词： circular cylinders tandem arrangement vortex shedding hydrodynamic forces

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NUMERICAL SIMULATION OF FLOW OVER TWO SIDE-BY-SIDE CIRCULAR CYLINDERS

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Journal of Hydrodynamics 2011年第6期23卷 792-805页

作者： SARVGHAD-MOGHADDAM Hesam NOOREDIN Navid GHADIRI-dehkordi behzad Department of Mechanical Engineering Neyshabur Branch Islamic Azad University Department of Mechanical Engineering School of Engineering Tarbiat Modares University

In the present paper, the unsteady, viscous, incompressible and 2-D flow around two side-by-side circular cylinders was simulated using a Cartesian-staggered grid finite volume based method. A great-source term technique was employed to identify the solid bodies （cylinders） located in the flow field and boundary conditions were enforced by applying the ghost-cell technique. Finally, the characteristics of the flow around two side-by-side cylinders were comprehensively obtained through several computational simulations. The computational simulations were performed for different transverse gap ratios （1.5≤T/D≤4） in laminar （Re=100,200） and turbulent （Re=104） regimes, where T and D are the distance between the centers of cylinders and the diameter of cylinders, respectively. The Reynolds number is based on the diameter of cylinders,D. The pressure field and vorticity distributions along with the associated streamlines and the time histories of hydrodynamic forces were also calculated and analyzed for different gap ratios. Generally, different flow patterns were observed as the gap ratio and Reynolds number varied. Accordingly, the hydrodynamic forces showed irregular variations for small gaps while they took a regular pattern at higher spacing ratios.

关键词： side-by-side cylinders vortex shedding flow induced forces finite volume method turbulent flow

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ABSs系统模糊控制器优化设计

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传动技术 2008年第2期22卷 23-28页

作者： Ahmad Mirzaei Mehdi Moallem behzad mirzaeian dehkordi B. Fahimi Department of Electrical and Computer Engineering lsfahan University of TechnologyIran Department of Electrical Engineering University of Texas at ArlingtonArlingtonUSAon leave from the Department of Electrical and Computer EngineeringIsfahan University of TechnologyIran Department of Electronic Engineering Faculty of EngineeringIsfahan UniversityIran Department of Electrical Engineering University of Texas at Arlington

已经开发了的ABSs系统改善了突然制动和特别是滑动路面状况时车辆控制。这样的控制目标是在保持车辆合适稳定性及可操纵性和缩短车辆刹车距离情况下在要求的方向增大车轮的牵引力。本文提出了ABSs系统优化的模糊控制器。从保持其车轮滑... 详细信息

已经开发了的ABSs系统改善了突然制动和特别是滑动路面状况时车辆控制。这样的控制目标是在保持车辆合适稳定性及可操纵性和缩短车辆刹车距离情况下在要求的方向增大车轮的牵引力。本文提出了ABSs系统优化的模糊控制器。从保持其车轮滑动值为目标函数获得车轮最大的牵引力和车轮最大的减速度。采用遗传算法优化模糊系统的全部组件。采用误差数整体优化方法收敛接近最优点。仿真结果表明快速收敛和对不同路况的控制器的最好性能。

关键词：抗制动侧滑系统(ABS) 误差数优化遗传模糊控制器混合控制器

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