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In this study, the effect of the switching frequency on the torque ripple of the switched reluctance motor (SRM) is investigated. The switching frequency is important parameter in the design of the systems. High switching frequency is an important factor for determining the performance of electromechanical or electronic systems. Namely, the electromechanical systems have both electrical and mechanical time constants. The switching frequency must be the high same rate with time constants for healthy and robust control in systems. The SRM is driven at different switching frequencies from 10kHz to 100kHz to see the effect of switching frequency on torque ripple. The effect of switching frequency of the SRM on torque ripple are performed with simulation studies at different speeds and it is seen that as the switching frequency increases, torque ripple decreases and torque ripple is nearly same after the specific switching frequency. [ABSTRACT FROM AUTHOR]

In this study, with 15 kW induction motor is to be designed using the same stator structure and the new synchronous reluctance motor (synrm) were compared. SynRM are known as cold rotor motors. As with copper rotor induction motor (aluminum) rotor copper losses are minimized since no rods reduced to zero and the rotor losses. In this way it is achieved improvements in motor efficiency by reducing losses. Design of the rotor geometry SynRM rotor induction motor stator were performed using the same geometry. Design performing Ld/Lq rate design is made taking into consideration current barriers. The rotor lamination sheet on the air/iron ratio of parametric analysis on the lamination steel designed to be important for motor performance has been realized. This parametric analysis of lamination steel as a result it was decided to have 4 barrier. Asynchronous motors and SynRM analysis were compared. SynRM'n efficiency value according to the received value has occurred to a rise of 3%. Thus efficiency by changing the motor rotor induction class, which was raised to the IE1 IE3 class. The torque ripple is provided an improvement of approximately 8%. [ABSTRACT FROM AUTHOR]

In this study, position tracking control of the switched reluctance motor (ARM) is realized with the proportional (P) and the proportional + integral (PI) conventional controllers. P and PI controllers are used for position loop and speed loop, respectively. However, trial-and-error or analytical methods can be utilized for determination of the coefficients of the conventional controllers. These methods are capable of linear systems, but they are incapable on such that ARM drive systems. For this reason, these parameters are defined as online using genetic search algorithms in this study. Simulation studies are achieved for the performance of the proposed control systems under different position conditions. The obtained simulation results show that the actual position of the motor closely follows the reference position of the motor. [ABSTRACT FROM AUTHOR]

In the present study, flux and inductance measurement methods of the switched reluctance machines have been investigated. The three measurement methods which are static DC, static AC and dynamic measurement methods have been discussed separately, and difference among them have been introduced. The aim is to present the proper method for the providing the inductance profile of the switched reluctance machine. For this reason, firstly an inductance model that approximates the real inductance profile of the switched reluctance machine has been identified. Simulation studies of the measurement methods have been achieved by using this model. The simulation results have been proved with experimental measurements of an 8/6 switched reluctance machines. [ABSTRACT FROM AUTHOR]

Structure of a Switched Reluctance Motor (SRM) has double salient poles and does not include permanent magnet, conductor and bar. Therefore, this geometrical structure is intended to be used as an advantage for the screw pump proposal; magnetic rotor has been designed partially, inspired from the structure of radial and axial flux SRM. Proposed SRM has 6/4 poles and 3 phase configuration. Screw rotor, which is made of non-magnetic material, has been installed between magnetic rotor and the rotor structure of the screw pump has been obtained. In stator, there are 4 coils of 2000 turns installed in flux path for each phase. The screw rotor isn't included in the magnetic coupling. Here the pump rotor itself is an actuator of direct drive application. This system has been called as SP-SRM. Electrical and magnetic quantities like inductance, torque, power, magnetic flux of the SPSRM have been calculated analytically and predicted by finite elements method (Ansoft Maxwell 3D); it doesn't cover mechanics and dynamics of the proposed system. In the direct drive actuator application where the rotor itself is considered as an actuator, the SP-SRM looks like an attractive choice with its superiority of eliminating the used of a driver motor, couplings and gear boxes. [ABSTRACT FROM AUTHOR]

Switched reluctance motors (SRMs) have been increasingly used in industrial applications because of their simple structure and reduced rotor loses. As a result of improvement of power electronics and computer technology, there have been increased attentions to control the SRMs. Dynamic characteristics of SRMs are varying depending on working conditions. A PI (Proportional-Integral) controllers with constant gain values have overshoot and oscillations at varying speeds and load especially at transient-state. In this paper, a fuzzy PI controller was proposed to control the speed of the SRM. Proportional and integral gains of the PI controller are tuned by fuzzy logic controller (FLC) depending on speed error and change of the speed error. Fuzzy PI controller was implemented using TMS320F240 digital signal processor. Experimental results showed that fuzzy PI controller has better performance than a PI controller with a range of working conditions. [ABSTRACT FROM AUTHOR]