5908

5523

كارشناسي ارشد

قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1389

نه،121ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مرتضي سقائيان نژاد

فريد شيخ الاسلام

21/2/90

جعفر قيصري، بهزاد ميرزائيان

مهندسي برق و كامپيوتر

ID5523

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Speed Control of Switched Reluctance Motor Drive Considering Torque Ripple Minimization Using Nonlinear Energy Based Control Mohammad Masoud Namazi Esfahani mm namaziesfahani@ec iut ac ir Date of Submission Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Sayed Mortaza Saghaiannejad saghaian@cc iut ac ir Abstract In recent years there is a growing concern about the use of switched reluctance motor Robustness high efficiency low cost high speed simple structure easy to maintain high controllability high torque to inertia ratio simple power converter circuits with reduced number of switches and smaller dimension of the motor are unique features of this machine However high torque ripple and acoustic noise are most disadvantages of the motor and torque ripple minimization of switched reluctance motor drives is a major subject based on these drives extensive use in the industry In this thesis first a nonlinear adaptive sliding mode speed control of switched reluctance motor in the presence of parameter variations load uncertainty and external disturbances for the purpose of torque ripple reduction and steady state characteristic improvement is presented To achieve this goal theoretical analyses of mathematical modeling and computer simulations with MATLAB Simulink have been performed Simulation of the drive system requires models for the SRM drive subsystems and their interconnections The magnetization characteristics of this machine are achieved In this model currents produced by the nonlinear function which is implemented as a lookup table The electromagnetic torques produced by the stator phases are provided by the nonlinear function implemented as a lookup table The torques produced by all stator phases are then summed up to provide the total torque on the rotor shaft These characteristics data of the 4kw 8 6 switched reluctance motor for a finite set of currents and rotor position are implemented in the lookup tables of model In the method mentioned above for the control strategies of the switched reluctance motor it is assumed that its parameters are known exactly or the unknown parameters can be identified by the adaptive technique However the parameters of the SRM are not exactly known and always vary with current and position Actually control is difficult to implement owing to its complex algorithm when considering the structural information of switched reluctance motor in design Improving the applicability of the SRM on the basis of the simplified model and taking the structural characteristics into account is a significant step in designing the controller of the switched reluctance motor Hence by using a well known cascaded torque control structure and taking the machine physical structure characteristics into account the proposed composite passivity based

مرتضي سقائيان نژاد

فريد شيخ الاسلام

جعفر قيصري، بهزاد ميرزائيان