A. Siadatan

Islamic Azad University, Teheran, Tehrān, Iran

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Publications (36)3.59 Total impact

  • M. Rafiee, E. Afjei, A. Siadatan
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    ABSTRACT: A new sensorless circuit for Switched Reluctance Motor (SRM) is designed, constructed and tested in this paper. The circuit uses three steps to control the SRM. One of them is used in motor starting. The other one controls the motor in low speed and the third one is used in high speed. These steps are implemented by an inexpensive AVR microcontroller chip. An asymmetric bridge converter is used to excite the winding of the motor phases. The presented sensorless board is then constructed and tested on two SRMs which are three-phase 12 by 8 and three-phase 6 by 4 SRMs. The parameters of these motors which are required in sensorless techniques are obtained by Finite Element Method (FEM) analysis. The operational waveforms and results that are obtained in laboratory are illustrated in different figures.
    Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
  • A. Siadatan, M. Rafiee, E. Afjei
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    ABSTRACT: In this paper a Multilayer Switched Reluctance Motor (MSRM) is introduced, simulated and controlled. The presented MSRM which has five 4 by 4 magnetically independent layers produces more torque with less torque ripple rather than custom SRMs. The motor is rotated by exciting each layer and repeating the algorithm. Since independent layers, there is no isolation problem in the presented MSRM. The motor cooling can also be done easily. On the other hand, there is more area for coil wrapping in the presented motor which means the motor can generate more torque. The paper presents the design and simulation of the MSRM and also the control algorithm. Different parameters of the motor are obtained by 3-D magnetostatic analysis by Finite Element Method (FEM). The motor is then constructed and tested in laboratory by an asymmetric bridge converter and its characteristics are determined.
    Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
  • A. Miremadi, H. Torkaman, A. Siadatan
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    ABSTRACT: The performance of the Switched Reluctance Motors (SRMs) in different applications has widely been investigated by various studies. Therefore, the influences of some abnormal conditions have also applied significant orientations on the research areas. One of the most observed faults is the stator winding short circuit which may leads to produce the unbalanced distribution of magnetic field. In this paper, it is attempted to firstly introduce the new structure of dual stator SRM (DSSRM). Secondly, by means of three dimensional finite element method (3D FEM) the effects of short-circuit faults (SCF) on motor profiles are investigated, which static and dynamic behaviors of the motor in healthy and several SCF conditions evaluated. A new method namely as maximum current point tracking (MCPT) is introduced to evaluate the SCF in SRM, so an index is proposed to detect the numbers of shorted turns in faulty phase. The overall outcomes highlight the advantages of using this method and index which is general enough to be applied to any type of SRM.
    Power Electronics, Drive Systems and Technologies Conference (PEDSTC), 2013 4th; 01/2013
  • R. Moeini, E. Afjei, A. Siadatan
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    ABSTRACT: Torque ripple is an inherent problem of SRM which should have been decreased. Several methods have been presented for torque ripple reduction in Switch Reluctance Motor (SRM). Some of them are based on changing the structure and the geometry of the motor. The other methods are done by utilizing control techniques. This paper introduces a 6 by 4 three-phase SRM as a normal mode structure which is designed by the SRM formula. The other modes of the SRM have been created by small changes in the dimensions of the normal mode. All of the modes are simulated by Finite Element Method (FEM). Next, the value of generated torque and torque ripple versus different rotor position are achieved. After that, the effect of the variations in dimensions of the SRM is studied on the value of the generated torque and torque ripple and according to this information the optimal structure is chosen. At the end, the optimal structure is constructed, tested in laboratory and the operational results are obtained.
    Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
  • E. Afjei, A. Siadatan, M. Rafiee
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    ABSTRACT: The presented paper introduces a low cost converter for Switched Reluctance Motor (SRM) control. Many types of converters are implemented to drive SRM. Generally Asymmetric Bridge Converter (ABC) is selected in which two switches are used per phase to excite the phase winding. The upper transistor in ABC faces a problem in gate-source voltage which prevents SRM phase to be excited properly. Some methods are used to solve the problem which are usually increases the cost and also decreases the efficiency of the converter circuit. The problem is basically related to the custom Mosfet drivers. In this paper, a low cost ABC is presented in order to solve the problem. In the converter, a different type of Mosfet driver is used. The constructed ABC circuit is then tested in the laboratory on a 3hp 6 by 4 SRM and the operational results are obtained.
    Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
  • A. Siadatan, A. Ostadrahimi, E. Afjei
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    ABSTRACT: As a result of several years of research, a well- developed technology in the area of reluctance motor has now evolved. A reluctance machine consists of a rotor, which has no windings of any kind, and is free to rotate between the pole pieces of a stationary singly or multiply excited magnetic structure known as stator. This paper analyses and compares two different types of switched reluctance motor/generator and their applications. In the motor/generators analysis, the finite element technique is employed, where as in the experimental study, two prototype motor/generators have been built and tested.
    01/2012;
  • A. Siadatan, V. Najmi, E. Afjei
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    ABSTRACT: Switched Reluctance Machine is applied for many industry applications because it has simple structure, high variable speed range. This paper introduces a novel configuration for a four phase switched reluctance machine. The proposed novel machine consists of two magnetically stator and rotor layers, where each stator set includes eight salient poles with windings wrapped around them, while the rotor comprises of six salient poles with different arc lengths and no windings. This motor includes the two sets are connected dependently. In this connection the stator poles in each layer can have both North and South Pole configurations. A new four phase 8/6 two layers Switched Reluctance Machine is proposed for analysis with 3D Finite Element Method (FEM) by numerical techniques. The motor application is simulated with Magnet Software to get motor's characteristics consist of flux and torque. A novel four phase field assisted Switched Reluctance Generator (SRG) is proposed. This generator consists of two magnetically dependent stator and rotor sets. The magneto static simulation is carried out in this study.
    Electrical Engineering (ICEE), 2012 20th Iranian Conference on; 01/2012
  • M. Rafiee, H. Moradi, A. Siadatan, E. Afjei
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    ABSTRACT: In this paper, two Switched Reluctance Motors (SRM) with two-layer configuration are investigated to analyze an efficient method to reduce torque ripple in multilayer SRMs. The method named Rotor Shifting Technique (RST) is simply shifting a rotor of one set respect to other set. In the proposed method the RST is used to increase the overlap between rotor and stator poles. One of the presented motors is 6/4 type and the other one is 8/4 type. The constructions and mathematical model of the two SRMs is presented at first. Then the rotor shifting is done on them and at the end, the SRMs operation is simulated by Finite Element Method (FEM) using Magnet CAD package to analyze the proposed method. The torque ripple and also flux linkage versus rotor angle curve, before and after the rotor shifting, is also presented to show the effect of the technique on the SRMs behavior.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • V. Najmi, A. Siadatan, E. Afjei
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    ABSTRACT: Switch Reluctance Machine has remarkable characteristics which make it suited for industrial application. Their robustness and simple structure are main attractive features of this kind of machines. With increasing the electrical energy demands, SR machine due to their inevitable and desirable characteristics is utilized as generator. In this paper, a 12/8 field-assisted Switched Reluctance Generator (SRG) is modeled to figure out its characteristics, then simulation analysis is carried out using 3 dimensional Finite Element Method (FEM). Meanwhile, the output voltage of this SRG is extracted employing simulation data and curve fitting techniques. Finally, experimental analysis is performed to validate the state of art in this paper.
    Electrical Engineering (ICEE), 2012 20th Iranian Conference on; 01/2012
  • A. Siadatan, M. Rafiee, H. Moradi, E. Afjei
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    ABSTRACT: Nowadays switched reluctance machine is very ideal for many applications because of its simple configuration and having very high power density at low-cost. This paper analyzes and compares two different types of switched reluctance motor/generator (SRMG) and their applications. The proposed novel motor/generators consist of two magnetically independent stator and rotor sets (layers), where each stator set includes four salient poles with windings wrapped around them, the rotor comprises of two salient poles with different arc lengths. In the motor/generators analysis, the finite element technique is employed, where as in the experimental study, two prototype motor/generators have been built and tested.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • H. Moradi, E. Afjei, A. Siadatan
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    ABSTRACT: This paper presents the comprehensive geometric parameters design of a Homopolar Double Salient-Pole brushless dc motor. The under consideration configuration is designed based on having double layers of the stator/rotor and a stationary field assisted coil placed between them. The design methodology employed enabled a swift initial design of the lamination geometric parameters such as air-gap length, rotor pole arc length, stator pole arc length, number of winding turns per pole and the determination of the dc coil turns, maximum dc flux and minimum dc coil area. To evaluate the machine performance, the numerical technique has been utilized. In the numerical analysis, 3-D Finite Element (FE) analysis has been carried out using a MagNet CAD package (Infolytica Corporation Ltd.), for a three-phase 12-8 and 1.5-kW Double Salient-Pole Homopolar BLDC motor as a design example to support the efficacy of the proposed design procedure.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • M. Asgar, A. Siadatan, E. Afjei
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    ABSTRACT: Single phase switched reluctance motors (SRM) has special place in high volume, low-cost and low-performance applications as well as high-speed, low-power motor drives in different industrial applications. Single phase SRMs have some disadvantages such as low power density and lack of the self-starting ability. In order to overcome these problems a few methods have been presented. For example utilization of permanent magnet or special rotor configuration or additional mechanisms are some of this approaches. Have been adopted by different researchers many of these methods are expensive or make the manufacturing process more difficult. This paper proposes a new method which overcomes these problems. The proposed approach focuses on a new single phase SR motor topology which will address a procedure for reliable starting, The single phase motor utilizing a new converter topology for this motor and the corresponding control methodology. The new configuration enables the motor for self-starting without the use of permanent magnet or any other starting device. The prototype was simulated, fabricated, and tested in laboratory. Simulation and experimental results of the proposed SRM drive system are presented.
    01/2012;
  • V. Najmi, A. Siadatan, E. Afjei
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    ABSTRACT: Tendency to simple and robust machine in harsh applications, makes Switched Reluctance Motor (SRM) appealing for many industries. In this paper, an 8/6 two-layer Switched Reluctance Motor is investigated for servo applications with shifting a rotor of one set respect to other set. Rotor shifting technique (RST) is an innovative method which is proposed as simple, efficient way to reduce torque ripple in multilayer SR motors. This technique is applied to study case motor to find out its correspondences to such servo application which needs smooth torque profile. Then simulation analysis is performed using 3D Finite Element Method (FEM) to verify suitable response of its output torque. The results show that this motor plus RS technique can be promising to such servo application.
    01/2012;
  • E. Afjei, H. Moradi, A. Siadatan
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    ABSTRACT: This paper presents the efficiency estimation of a double salient-pole Homopolar Brushless dc Generator in order to determine the optimum operation. For the under consideration generator an assistant dc field is replaced with permanent magnet in the rotor. Varying the amplitude and direction of the current in the field coil can control the generated output voltage to a level between zero volts and the maximum voltage. In this analysis, evaluation of the core iron losses resulting from eddy current and hysteresis, and also copper losses for both phases coil and field coil are investigated. The iron losses are then derived and evaluated for no-load. To evaluate the accuracy of the calculated parameters, the numerical technique has been utilized. In the numerical analysis, for a three-phase 15/10 Double Salient-Pole Homopolar Brushless dc Generator as a design example, 3-D Finite Element (FE) analysis has been carried out using a MagNet CAD package (Infolytica Corporation Ltd.).
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • A.R. Kazemi, M. Asgar, E. Afjei, A. Siadatan
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    ABSTRACT: This paper presents a new sensorless method for controlling a Three-Phase Switched Reluctance Motor utilizing bifilar drive. In this method rotor position is extracted by analyzing the current results of injected high frequency diagnostic pulses to the motor windings. The proposed method is based on the dependency of the phase current slope that achieved from the diagnostic pulses to the rotor position. The new method is applicable at standstill as well as the running mode. The use of bifilar windings for rotor position detection makes the control circuit to be completely isolated from main winding and the power transistors. Also the simplicity of hardware and control algorithm minimizes the cost of drive. The proposed method was implemented on a 3-phase 6/4 SRM with bifilar windings and the experimental results demonstrated the accuracy and function ability of this method.
    Power and Energy (PECon), 2010 IEEE International Conference on; 01/2011
  • A.R. Kazemi, M. Asgar, E. Afjei, A. Siadatan
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    ABSTRACT: This paper presents a new method for indirect sensing of rotor position in a switched reluctance motor using bifilar windings in a resonant circuit. The detection method stems from the fact that the changes in sine wave magnitude produced in a RLC resonant circuit by motor variable phase inductance can be used to detect the rotor position. The proposed method is applicable at standstill as well as the running mode. The use of bifilar windings for rotor position detection makes the control circuit to be completely isolated from main winding and the power transistors. It also results in simple hardware which minimizes the cost of drive circuitry. The proposed method was implemented on a 3-phase 6/4 SRM with bifilar windings and the experimental results demonstrated the accuracy and function ability of this method.
    Power and Energy (PECon), 2010 IEEE International Conference on; 01/2011
  • E. Afjei, M. Askari, M. Asgar, A. Siadatan
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    ABSTRACT: This paper presents new sensorless rotor position detection in a two phase Switched Reluctance Generators (SRG) by applying the DSP technique. This Method, it's possible to assess the placement of rotor of switched reluctance motors senselessly with amplitude modulation by field assisted in static position and in Motion. The proposed method is based on the dependency of the phase current slope that achieve from AM with DSP technique. These estimators may be utilized to remove sensors for cost reduction as well as back up virtual sensors in a fault resilient drive. The validation results show the effectiveness of the proposed estimators.
    01/2011;
  • A. Siadatan, V. Najmi, E. Afjei
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    ABSTRACT: Switched Reluctance Motor is simple structure motor which has great features that is appealing for industrial applications. The major remarkable features consist of robustness, no rotor winding which provides high speed application for this kind of motor. In this paper, a novel Multilayer Switched Reluctance Motor (MSRM) with 4 magnetically independent layers which each layer consists of 4 rotor poles and 4 stator poles is proposed. The rotor of each set has rotated 22.5° to make rotation of multilayer SRM This MSRM has low torque ripple and can produced higher torque respect to usual SRM with same volume. To evaluate the motor operation, two types of analysis, namely numerical techniques and the simulation analysis have been utilized. In the numerical analysis, due to the highly nonlinear nature of the motor, a finite element analysis is employed. Then, the simulation analysis is carried out to represent motors application.
    Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on; 01/2011
  • V. Najmi, A. Siadatan, M. Asgar, E. Afjei
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    ABSTRACT: Switched Reluctance Machine is applied for many industry applications because it has simple structure, high variable speed range. This paper is proposed a novel three phase 6/4 two layer field-assisted Switched Reluctance Generator (SRG). This generator consists of two magnetically dependent stator and rotor sets. The magnetostatic analysis includes mathematical and simulation analysis using Finite Element Method (FEM) is carried out in this study.
    Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on; 01/2011
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    ABSTRACT: The main objective of static power converters is to produce an AC output waveform from a DC power supply. The output voltage waveform is not exactly a sinusoidal wave. Some ways should be found to improve the output voltage waveform. This paper introduces a method to minimize the total harmonic distortion (THD) of output voltage waveform in multilevel inverters. Steps amplitude of output voltage wave is so effective in total harmonic distortion. DC voltage sources of a cascade inverter determine the amplitude of steps. Capacitors, batteries, and renewable energy voltage sources can be used as the multiple DC voltage sources. Values of these DC sources could be set optimum to improve the THD. Parametrical Fourier analyzing of output signal would give an equation which helps us in this project. This equation presented in this paper. Optimtool-MATLAB and SIMSCAPE-SIMULINK-MATLAB software have been used for simulation. Results show that the DC sources in a cascade multilevel inverter shouldn't be equal and needs to be set at definite values.
    Electrical Machines and Power Electronics and 2011 Electromotion Joint Conference (ACEMP), 2011 International Aegean Conference on; 01/2011

Publication Stats

18 Citations
3.59 Total Impact Points

Institutions

  • 2009–2012
    • Islamic Azad University
      • Department of Electrical Engineering
      Teheran, Tehrān, Iran
    • Islamic Azad University West Tehran Branch
      Teheran, Tehrān, Iran
  • 2007–2011
    • Shahid Beheshti University
      • Department of Electrical Engineering
      Teheran, Tehrān, Iran