كاهش لرزش در موتورهاي سوئيچ رلاكتانس با استفاده از روش هاي مبتني بر كنترل كانورتر

چكيده انگليسي :

Vibration Reduction of Switched Reluctance Motors With Converter Control Based Methods Amirhosein Malekipour a malekipour@ec iut ac ir Date of Submission 2019 6 22 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Sayed Morteza Saghaiannezhad saghaian@cc iut ac irAbstract Simplicity of structure low manufacturing cost high reliability high torque density and wide operationalrange have made Switched Reluctance Motor the appropriate choice in many applications including home ap pliances HEVs and even aeronautics industry The most obvious drawback of SRM application is due to itshigh amount of vibration which has restrained SRM usage in wide scopes SRM has a doubly salient structure which leads to the formation of radial forces in the air gap Radialforces are known to be the principal cause for vibration occurrence in SRM Stude of this phenomenon andadopting methods for vibration reduction while SRM is operating have become the centre of attentions aroundSRM application SRM operation due to its highly non linear characteristics is dependent to the workingpoint motor is running at and SRM operation can be devided into three instances of Magnetization Currentchopping and Demagnetization The Demagnetization instance plays the most dominant role in vibration ofSRM so proposing of new methods capable of controlling voltage and current of each phase in this instanceleads to the vibration alleviation In order to alleviate the vibration voltage and current and accordingly radial forces must be controlled insuch a way that their harmonic components do not interfere with natural frequencies of stator Based on theequations mean value and slope of the imposed phase voltage both in the onset and during the Demagnetizationinstance have the most impact on how the vibration waveform is going to shape On the other hand in addition tothe radial forces their first and second order time derivatives are also important in determination of the vibrationwaveform So three methods controlling the Demagnetization voltage are introduced and their efficacy isvalidated through simulation and practical test The first method Dynamic Demagnetization Average VoltageControl is based on simultaneously calculation of the average imposed voltage of Current chopping instanceby the microprocessor Calculated values are being utilized in the Demagnetization instance to control theswitching duty cycle and as the result the imposed voltage in Demagnetization instance will have the sameaverage value compared to the Current chopping s In the second and the third methods according to therotation speed reference current and the DC link voltage the control algorithm implement a variable duty cycleto control the lower switch of each phase so the average imposed voltage in the Demagnetization instance willhave a waveform of exponential like and inverse exponential like shape In the two latter proposed methods both the slope and the average of imposed voltage can be controlled simultaneously Proposed algorithmsare implemented and simulated for a given SRM in a finite element based software package and based onthe waveform of voltage and current of each phase generated radial forces are calculated Then these forcesare being mapped to stator s teeth and so the vibration waveform is ready to be calculated Finally proposedmethods are implemented on a test rig and practical results are evaluated and proven to be sufficient enough toreduce the vibration intensity Keywords Swithced Reluctance Motor Vibration Resonance Voltage Control

مالكي پور، اميرحسين

كاهش لرزش در موتورهاي سوئيچ رلاكتانس با استفاده از روش هاي مبتني بر كنترل كانورتر

موتور سوئيچ رلاكتانس , لرزش , رزونانس , كنترل ولتاژ