كاهش ريپل گشتاور درايو موتور سوئيچ رلوكتانس به همراه حداقل سازي تلفات مسي با استفاده از توابع توزيع گشتاور

چكيده انگليسي :

100 Torque Ripple Reduction and Minimization of Copper Losses with Use of TSF Technique in SRM Drive Systems Milad Afshoon Milad afshoon2000@yahoo com Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Sayed Morteza Saghaiannezhad saghaian@cc iut ac ir Abstract Inherent simplicity robust construction reliability and appropriate ef ciency are the features thatmake the switched reluctance motor drives a good candidate for industrial drive and variable speedapplications SRM has a simple structure The stator of SRM is salient with concentrated phase windingswhich gives it an advantage over the other conventional ac and even dc motors Moreover SRM rotor is alsosalient with no winding or magnet Therefore the rotor structure in SRMs is the most simple one among theentire electrical machines This simplicity has been caused to cost reduction and high reliability of the motor However the doubly salient structure which is the reason of nonlinearity in the torque current anglecharacteristic brings about the high torque ripple in SRM The nonlinearity of magnetic characteristics andthe discrete torque production mechanism are the major reasons of torque ripple in switched reluctancemotors SRM This drawback which results in higher torque ripple in SRM compared to the other electricalmachines prevents using of SRMs in servo type applications Torque ripple reduction of SRM has beenstudied on both elds of machine design and electronic control Torque ripple reduction by improving thestructure was studied in the case of machine design Electronic control approaches such as torque sharingfunction techniques emotional controllers or passivity based adaptive sliding mode controllers are alsohelpful in the case of electronic control Direct instantaneous torque control is the other electronic control fortorque ripple minimization in SRM drives But this method have some trouble in implementation such ascomplicated switching role Torque sharing function method can be mentioned as one of the most effectiveelectronic control techniques to reduce the torque ripple in SRMs Based on this method the reference torqueof each phase should be intelligently changed so that the sum of torque of two adjacent phases is equal to thereference torque Hence many functions can realization this precept However the only criteria considered bythese functions is torque ripple minimization Efforts on optimizing the torque sharing functions based on thesecondary objective function have been performed The secondary objective function of copper lossminimization based on a logical way was also studied Considering more conditions as the secondaryobjective function make the problem much more complicated For instance to reduce the copper loss smallcommutation region of TSF is needed which is achievable at low speeds Moreover reducing phase voltageto avoid saturation requires larger commutation region TSF must be chosen in such a way that all the aimsare satis ed However one cannot realize all the entire goals simultaneously Therefore a desirable balancebetween the secondary objective functions needs to be set A family of TSFs has been announced This paperproposed a method considering the nonlinearity in inductance pro le and its related effects on torque ripplereduction and minimization of copper losses simulation and experimental results will be presented inaddition an accurate method is proposed for inverting magnetic characterization of SRM Keywords Switched Reluctance Motor SRM Torque Sharing Function TSF TorqueRipple Minimization TRM Finite Element Method FEM

افشون، ميلاد

كاهش ريپل گشتاور درايو موتور سوئيچ رلوكتانس به همراه حداقل سازي تلفات مسي با استفاده از توابع توزيع گشتاور

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