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Dalal, Dhaval B. "A novel parameter compensation scheme for indirect vector controlled induction motor drives." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101179.
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Indirect vector controlled induction motor drives are gaining acceptance because they allow the induction motor to be controlled like a separately excited dc motor, i.e. they achieve decoupling of torque and flux producing currents. But, the effectiveness of these drives is lost as they are highly parameter sensitive. Studies have indicated that the decoupling of the torque and the flux channels is lost when machine parameters change with temperature, saturation, etc. Many schemes have been proposed to overcome these parameter sensitivity effects. But most of these schemes themselves are parameter-dependent and hence inapplicable to high precision control applications. A new parameter compensation scheme which uses air gap power equivalence for sensing parameter changes is developed in this thesis. It is shown that this scheme is independent of key motor parameters and requires no additional transducers for implementation.M.S.
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Freere, Peter Andrew. "Current controllers for vector controlled permanent magnet synchronous motor drives." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357627.
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Green, T. C. "Scalar controlled induction motor drives." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/892.
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Bharadwaj, Aravind S. "Vector controlled induction motor drive systems." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172143/.
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Samaranayake, Lilantha. "Distributed control of electric drives via Ehernet." Licentiate thesis, KTH, Electrical Systems, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1656.
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This report presents the work carried out aiming towardsdistributed control of electric drives through a networkcommunication medium with temporal constraints, i.e, Ethernet.A general analysis on time delayed systems is carried out,using state space representation of systems in the discretetime domain. The effect of input time delays is identified andis used in the preceding controller designs. The main hardwareapplication focused in this study is a Brushless DC servomotor, whose speed control loop is closed via a 10 MbpsSwitched Ethernet network. The speed control loop, which isapproximately a decade slower than the current control loop, isopened and interfaced to the network at the sensor/actuatornode. It is closed at the speed controller end at another nodein the same local area network (LAN) forming a distributedcontrol system (DCS).
The Proportional Integral (PI) classical controller designtechnique with ample changes in parameter tuning suitable fortime delayed systems is used. Then the standard Smith Predictoris tested, modified with the algebraic design techniqueCoefficient Diagram Method (CDM), which increases the systemdegrees of freedom. Constant control delay is assumed in thelatter designs despite the slight stochastic nature in thetiming data observations. Hence the poor transient performanceof the system is the price for the robustness inherited to thespeed controllers at the design stage. The controllability andobservability of the DCS may be lost, depending on the range inwhich the control delay is varying. However a state feedbackcontroller deploying on-line delay data, obtained by means ofsynchronizing the sensor node and controller node systemclocks, results in an effective compensation scheme for thenetwork induced delays. Hence the full state feedbackcontroller makes he distributed system transient performanceacceptable for servo applications with the help of poleplacement controller design.
Further, speed synchronizing controllers have been designedsuch that a speed fluctuation caused by a mechanical loadtorque disturbance on one motor is followed effectively by anyother specified motor in the distributed control network with aminimum tracking or synchronizing error. This type ofperformance is often demanded in many industrial applicationssuch as printing, paper, bagging, pick and place and materialcutting.
Keywords:Brushless DC Motor, Control Delay, DistributedMotion Control Systems, Proportional Integral Controller, SmithPredictor, Speed Synchronization, State Feedback Controller,Stochastic Systems, Switched-Ethernet, Synchronizing Error,Time Delayed Systems, Tracking Error
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Fick, Pieter D. "Evaluation of the constant current angle controlled reluctance synchronous machine drive." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52837.
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Thesis (MScEng)--University of Stellenbosch, 2002.ENGLISH ABSTRACT: This thesis describes. the design and evaluation of a constant current angle controller for a variable speed reluctance synchronous machine (RSM) drive, as an energy efficient high performance drive. An accurate model of the RSM, with the use of finite element analysis, is derived and implemented in simulation software. The current- and speed controllers are designed and evaluated using a complete simulation model of the whole drive. The controller is implemented on a TMS320F240 DSPbased digital controller, which was developed. The dynamic performance of the constant-current-angle control is compared with that of the conventional constant-daxis- current control method. The results obtained from the RSM drive confirm the simulation results. In the comparison of the two control methods it is shown that the constant-current-angle controlled RSM drive is an energy-efficient drive with good dynamic performance.
AFRIKAANSE OPSOMMING: Hierdie tesis beskryf die ontwerp en evaluering van 'n konstante stroomhoek beheerder vir 'n reluktansie sinchroon masjien (RSM) aandryfstelsel vir optimum effektiwiteit en dinamika. 'n Akkurate model van die RSM, met behulp van eindige element analise, is opgestel en geimplimenteer in 'n simulasie pakket. Die stroom- en spoedbeheerders is ontwerp en geëvalueer deur middel van 'n simulasiemodel vat die volledige aandryfstelsel. Die beheerder is geimplimenteer deur gebruik te maak van 'n TMS320F240 DSP-gebaseerde digitale beheerder, wat ontwikkel is. Die konstantestroornhoek beheer is vergelyk met die konvensionele konstante-d-as-stroom beheer metode. Die resultate van die praktiese stelsel korreleer baie goed met die resultate van die simulasie. Deur die vergelyking van die twee metodes is dit bevind dat die konstante-stroomhoek beheerde RSM aandryfstelsel 'n energie effektiewe aandryfstelsel met baie goeie dinamiese vermoë is.
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Odiete, G. C. E. "AC voltage adjustment and controlled compensation of electrical power drives." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373229.
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Kulkarni, Amol S. "Application of computational intelligence to high performance electric drives /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5897.
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Gulec, Mustafa Alpertunga. "Vector Controlled Elevator Drive." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607186/index.pdf.
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In this thesis, a practical vector controlled elevator drive is presented. Indirect vector control of induction machine is investigated in theory and then implemented. Control technique is compared with scalar control and induction machine is compared with dc motor. The operation of the system depends on induction machine parameters, so how to accurately and automatically obtaining of the parameters is also presented. Finally, the elevator system is introduced, the application of this control system to the elevator system is described and a basic elevator control system is simulated.
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Gule, Nkosinathi. "Analysis and evaluation of brush-DC equivalent controlled multiphase cage induction machine drive." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6489.
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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2011.ENGLISH ABSTRACT: The multiphase induction machine drive has been under investigation for the last half century. Although it offers several attractive advantages over the conventional three-phase induction machine drive, it is restricted to highly specialised applications. One aspect of the multiphase induction machine drive is the complexity of the control algorithm for decoupled flux and torque control. The complexity, arising from the required coordinate transformations, increases with increase in the number of phases of the machine. Recently, a method that allows the control of a six-phase induction machine drive without any coordinate transformations was developed and tested. This new control technique allows the control of the machine to be similar to that of dc machines through the use of special trapezoidal-shaped stator current waveforms. These stator phase current waveforms consist of field (flux) and torque current components, with flat-topped amplitudes allowing a stator phase to act alternately in time as either a flux or a torque producing phase. The idea is to have a number of stator phases acting as flux producing phases, whilst the remaining phases act as torque producing phases at each time instance. This dissertation takes a further step in the research on this particular control technique. As the control method relates directly to the brush-dc machine operation, in this dissertation, the control method is defined as a “brush-dc equivalent” (BDCE) control method. First, in this dissertation, a simple analytical method is developed to determine a defined optimal ratio of the number of field to the number of torque phases of a multiphase induction machine that utilises trapezoidal stator current waveforms. The method is applied to induction machines with up to fifteen stator phases. Finite element analysis is used to verify the validity of the developed criterion and to verify the square-like air gap flux density. Secondly, in this dissertation, an analytical method for predicting and evaluating the rotor bar current waveform of a cage multiphase induction machine is proposed. The method is based on the Fourier transform and the winding function theory under linear condition assumptions. The method also allows for the calculation of the electromagnetic torque and rotor bar losses. Skin effect is considered in the calculation of the rotor bar resistance of the machine. Again, finite element analysis is used to verify the analytically calculated results. The developed method can be expanded and used to evaluate the rotor current waveform of any multiphase induction machine supplied with any stator current waveforms. The BDCE control method is implemented on a prototype nine-phase cage-rotor induction machine drive. A nine-phase inverter and control system are developed for supplying the nine-phase induction machine with the trapezoidal stator current waveforms. Rotor current waveform measurements are taken on a specially designed rotor to verify the analytically predicted waveform. The linear relationship of the developed torque and torque current of the proposed BDCE control method is verified through measurements. Through the comparison of analytical calculated results with finite element calculated and measured results, it is shown in this dissertation that the developed analytical techniques can be used in the design and performance analysis of multiphase induction machines. Also, from the results, it is clear that the new control technique works remarkably well even in the flux weakening region. However, outstanding aspects, such as efficiency and generated torque quality of the proposed drive still need to be investigated further.
AFRIKAANSE OPSOMMING: Die multifase induksiemasjien aandryfstelsel word in die laaste halwe eeu al in navorsing ondersoek. Alhoewel dit verskeie aantreklike voordele bied bo die konvensionele driefase induksiemasjien aandryfstelsel, is dit beperk tot hoogs gespesialiseerde aanwendings. Een aspek van die multifase induksiemasjien aandryfstelsel is die kompleksiteit van die beheer algoritme vir ontkoppelde vloed en draaimoment beheer. Die kompleksiteit, wat voortspruit uit die vereiste koördinaat transformasies, neem toe met toename in die aantal fases van die masjien. Onlangs is 'n metode wat die beheer van ’n sesfase induksiemasjien sonder enige koördinaat transformasies doen, ontwikkel en getoets. Hierdie nuwe beheertegniek maak die beheer van die masjien soortgelyk aan dié van GS masjiene deur die gebruik van spesiale trapezium-vormige statorstroom golfvorms. Hierdie stator fasestroom golfvorms bestaan uit veld- (vloed-) en draaimoment-stroom komponente met plat amplitudes, sodat 'n statorfase om die beurt in tyd optree as óf' ’n vloed of 'n draaimoment genereerde fase. Die idee is om 'n aantal statorfases te hê wat as vloed genereerde fases dien, terwyl die oorblywende fases as draaimoment genereerde fases optree op enige tydstip. Hierdie tesis neem 'n verdere stap in die navorsing op hierdie spesifieke beheertegniek. Met die beheermetode wat direk verband hou met borsel-GS masjien werking, word in hierdie proefskrif die beheermetode as 'n "borsel-GS ekwivalente" ["brush-DC equivalent" (BDCE)] beheermetode gedefinieer. In die eerste plek word in hierdie proefskrif 'n eenvoudige analitiese metode ontwikkel om ’n gedefinieerde optimale verhouding van die aantal veld tot die aantal draaimoment fases van 'n multifase induksiemasjien te bepaal, wat van trapesoïdale statorstroom golfvorms gebruik maak. Die metode word toegepas op induksiemasjiene met tot vyftien statorfases. Eindige element analise is gebruik om die geldigheid van die ontwikkelde kriterium te verifieer en om die vierkantvormige luggaping vloeddigtheid te verifieer. In die tweede plek word in hierdie proefskrif 'n analitiese metode vir die voorspelling en evaluering van die rotorstaafstroom golfvorm van 'n kourotor multifase induksiemasjien voorgestel. Die metode is gebaseer op die Fourier transform en die wikkelingsfunksie teorie onder lineêre-toestand aannames. Die metode wend hom ook daartoe tot die berekening van die elektromagnetiese draaimoment en rotorstaafverliese. Die huideffek word in ag geneem in die berekening van die rotorstaafweerstand van die masjien. Weereens is eindige element analise gebruik om die analitiese berekende resultate te verifieer. Die ontwikkelde metode kan uitgebrei en gebruik word om die rotorstroom golfvorm van van enige multifase induksiemasjien te evalueer wat gevoer word met enige statorstroom golfvorms. Die BDCE beheermetode is toegepas op 'n prototipe negefase kourotor induksiemasjien. 'n Negefase omsetter en beheerstelsel is ontwikkel vir die toevoer van die trapesoïdale statorstroom golfvorms aan die negefase induksiemasjien. Die rotorstroomgolfvorm metings is geneem op 'n spesiaal ontwerpte rotor om die analitiese voorspelde golfvorm te verifieer. Die lineêre verwantskap tussen die ontwikkelde draaimoment en draaimomentstroom van die voorgestelde BDCE beheermetode is geverifieer deur metings. Deur die analitiese berekende resultate met die eindige element berekende en gemete resultate te vergelyk, wys hierdie proefskrif dat die ontwikkelde analitiese tegnieke gebruik kan word in die ontwerp en werkverrigting analise van ’n multifase induksiemasjien. Vanuit die resultate is dit ook duidelik dat die nuwe beheertegniek besonder goed werk, selfs in die vloedverswakking spoedgebied. Egter, uitstaande aspekte soos effektiwiteit en genereerde draaimoment kwaliteit van die voorgestelde aandryfstelsel moet nog verder ondersoek word.
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Shiref, Muez. "Investigation into PI controller output ripple in MRAS based electrical drives." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2264.
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In Sensorless speed drives, which employ a model reference adaptive system (MRAS) with a PI based adaptation mechanism, the gains of the adaptation mechanism play an important role into the general performance of the drives. The higher the gain, the faster the response and the more robust the drive is going to be against load disturbance. Although it is desirable to utilise an adaptation mechanism with high PI gains, it was demonstrated that high gains will cause the estimated speed to exhibit a high level of noise. More recently it was identified that the generated noise consists of high-order harmonics. As far as the literature is concerned, even though the high-order harmonic phenomenon was identified and addressed by few researchers, there was no description in their literature of the generated high-order harmonics or an assessment of their effect in terms of being problematic. Therefore, the aim of this research is to not only investigate the generation of high-order harmonics, but also to establish whether any generated noise in the estimated speed bear an effect on the overall speed estimation process. An MRAS based speed estimator is implemented to calculate the rotor flux- linkage and the speed estimates required in achieving field orientation and establishing speed control. An investigation has been carried out to gauge how the PI controller gains can influence the speed estimation process of the drive system. As well as examining the estimated speed for any trace of excessive noise and harmonics generation. It is revealed experimentally that no high-order harmonics were generated while implementing an adaptation mechanism with high PI gains. However, it was found that high PI gains do causes the estimated speed to become relatively noisy and also starts to carry some fundamental frequency components relevant to the stator’s electrical frequency. Therefore a programmable adaptive adjustment mechanism has been successfully developed not only to avoid the excessive generation of noise but also improve the speed estimation process. The performance of both of the static adaptation mechanism and the proposed adaptive one was assessed and compared.
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Zare, Abbas. "Implementation of Embedded Control System for Electric Drives based on Automatic Code Generation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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This project focuses on an improved methodology for embedded software development. MATLAB and Simulink allow the user to simplify control algorithm development for specific applications and load the implemented algorithms into the embedded target.
MATLAB allows constructing the control algorithms and its interface to different Digital Signal Processor (DSP) modules, such as A/D or D/A conversions and ePWM, as a block scheme in Simulink library. For example, Texas Instrument (TI) Company in collaboration with MATLAB allows the user to create a link between different DSPs of the TI and MATLAB software via the Simulink environment in order to generate automatically embedded C code adopted for different embedded targets.
The concepts of rapid prototyping and digital control technique in this project are realized based on using the Piccolo TMSF28035 TI C2000 MCU in conjunction with the Matlab/Simulink software based on an Integrated Development Environment (IDE) such as Code Composer Studio. Matlab/Simulink environment is used for the design, optimization, and off-line simulations of the model and power electronic circuits. The Real-Time Workshop converts the Simulink model to C or C++ programming code. Subsequently, the executable C code is automatically compiled to the assembly language for the TI C2000 MCUs, assembled, link-edited, and downloaded.
For the closed-loop controller, digital PI control is implemented and the values of the PI are defined by the pole placement method. Once the control scheme is built in Simulink, by automatic code generation capability of the MATLAB, the algorithm model is loaded into the DSP and runs the generated program.
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Shirsavar, S. A. "Parameter and speed estimation for vector controlled induction motor drives." Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263045.
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Li, Jian. "Implementation and simulation of various vector controlled induction motor drives." Thesis, University of Aberdeen, 1995. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU083755.
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The development of AC drives has gained momentum with the advancement of power electronic devices, control theory and technology of microprocessors. Based on high speed digital signal processing theory and power transistor hardware, two axis machine model and adaptive control techniques, a vector controlled fully digital induction motor drive is a high performance, low cost drive which is becoming increasingly popular in many industrial applications in all power ranges and will succeed the dc drive in the near future. The main goal of the thesis is to investigate the various forms of implementations of vector controlled digital signal processor based high performance induction motor drives. For this purpose, a TMS320C30 digital signal processor board with transducer and interfacing circuits has been designed, manufactured and built. Furthermore a conventional bipolar transistor inverter has been modified and interfaced to the DSP board. The entire hardware has been tested and successfully implemented. The control software is versatile and provides a platform for implementing various control configurations. The first part of the thesis reviews the development of various vector controlled drives; different mathematical models are presented and discussed together with digital simulation results of different vector controlled schemes. Intelligent control algorithms based on neural networks, fuzzy control, self-tuning control are also considered, some of them are tested by using real-time simulation or on a real drive. Different PWM strategies are investigated and compared, and a versatile and reliable real-time PWM algorithm is generated and integrated into the drive control software. Various parameter identification and auto-commissioning techniques are included in the control software. Details of experimentally obtained results for various vector drives are presented.
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Balasingham, Karunananthan. "A single-phase fully-regenerative converter for chopper controlled DC drives /." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59821.
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High performance dc servo-drives are often supplied from four-quadrant choppers to ensure low armature current ripple and large control loop bandwidths. In order to allow for continued regenerative braking, the dc link voltage is regulated within limits and the energy produced during braking is dissipated in resistances.In the proposed scheme the energy produced during regeneration is re-injected into the ac mains supply. The scheme consists of adding to each diode of the front end rectifier a transistor capable of conducting the reverse current, and suppressing the dc link capacitor.
The performance of the complete converter with a single phase ac mains is analysed in terms of operation in both motoring and braking modes. The advantages of the scheme are presented and its characteristics are compared to the standard chopper configuration and to the conventional phase-controlled converter systems. It is shown that the system exhibits high power factor and efficiency and is very compact.
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Legesse, Michael. "Coupled simulation of an indirect field oriented controlled induction motor drive." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116014.
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Conventionally, system simulations of induction motor drives use lumped parameters model of the motor. This approach assumes motor parameters to be constant during the entire operation of the drive. Unfortunately, these are known to vary significantly over the operating range of the motor due to factors such as magnetic saturation, skin effects, and operating temperature. The variations in motor parameters affect motor output and control parameters resulting in degraded drive performance. One way of overcoming this problem is by coupling the field model of the induction motor with the drive simulation. By replacing the lumped parameters model with the field model, the influence of different operating conditions on motor parameters can be taken into account dynamically. In this thesis such an approach is investigated by coupling the finite element analysis of an induction motor with the system simulation of the field oriented controlled drive. The results obtained for the coupled simulation are promising and possible future works to make this method of simulation more accurate and reliable are recommended.
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Wissman, James P. "Selected Methods for Field-Controlled Reconfiguration of Soft-Matter Electrical Contacts." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/920.
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Just as conventional mechatronic systems rely on switches and relays, machines that are soft and elastically deformable will require compliant materials that can support field-controlled reconfiguration. In this dissertation, I present several novel approaches to shape programmability that primarily rely on condensed soft matter and are stimulated by electric or magnetic fields. I begin with electric-field-driven methods for achieving shape programmability of elastomer-based systems. These include dielectric elastomer actuators and electrostatic beams that undergo extreme stretch. Classical theories in elasticity and electrostatics are used to examine the mechanical responses and instabilities of these soft, hyperelastic systems. Such modeling techniques are also used to examine another switching mode based on the snap through behavior of a buckled ferromagnetic beam under magnetic load. I will then discuss a unique approach to shape programmability that is based on electrochemistry and exploits the coalescence and separation of anchored liquid metal drops. In this case, electrical signals under 10V are utilized to manipulate surface energies and transition between bi-stable states. Experiments and Surface Evolver simulations show that oxidation and reduction on opposing poles of the coalesced drops create an interfacial tension gradient that eventually leads to limit-point instability. Theory derived from bipolar electrochemistry and vertical electrical sounding predicts droplet motion and separation based on geometry and bath conductivity, facilitating the optimization of reconfigurable devices using this phenomenon. I conclude with the application of the bi-stable droplets to a simple toggle switch capable of changing circuit conductivity by over three orders of magnitude.
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Kara, Emre Can. "Data-Driven Approaches to Demand Response: Studies on Thermostatically Controlled Loads and Electric Vehicles." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/468.
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This dissertation presents a set of studies that use data collected on thermostatically controlled loads (TCLs) and electric vehicles (EVs) to (i) understand and improve their participation in demand response (DR) strategies, and (ii) quantify their capabilities as DR providers. First, we focus on TCLs and formulate a centralized control scenario in which a large, heterogeneous population of TCLs are controlled to provide ancillary services. We investigate the system-level benefits that such a control scenario can impart, and focus on evaluating modeling strategies that capture TCL population dynamics when disturbances to individual TCLs are considered. We then discuss the upstream communication requirements from the TCLs to the main controller and the characteristics of the underlying cyberinfrastructure, and argue that end users will prefer a strategy in which they do not have to share real-time information with the centralized controller. Using measurements obtained at a neighborhood-level load aggregation point, we develop state estimation techniques to replace the need for upstream information exchange between individual end use loads and the controller. Our results have important policy implications for appliance standards and the participation of loads in DR services. We show that the proposed aggregate TCL modeling strategy better captures the dynamics of an aggregate TCL population with no additional computational burden in comparison to state-of-the-art strategies. We also show that if individual thermal parameters of TCLs are available to the main controller, the controller can improve on its knowledge of the state of the TCL population using measurements obtained from a neighborhood-level load aggregation point. Following our study of TCLs, we focus on centralized control of an aggregation of commercial EV charging stations. We investigate the benefits of managed EV charging to different stakeholders engaged in the reliable operation of the power grid. To do this, we leverage data collected from smart devices to overcome limiting assumptions commonly made in the literature regarding: (i) driving patterns, driver behavior and driver types; (ii) the scalability of a limited number of simulated vehicles to represent different load aggregation points in the power system with different customer characteristics; and (iii) the charging profile of EVs. As part of this study, we investigate the relationship between the EV infrastructure availability, EV load flexibility and benefits to stakeholders, a relationship which has implications for future improvements to DR programs. We show that managed EV charging can decrease the contribution of EV charging loads to the system peak load by approximately 40%, and reductions up to 24% in the monthly bills are possible for EV aggregations.
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Billis, Gerald. "The design and evaluation of a microprocessor-controlled triac cycloconverter two-phase induction motor drive." Thesis, Hong Kong : University of Hong Kong, 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1285072X.
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Sünter, Sedat. "A vector controlled matrix converter induction motor drive." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/12965/.
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This thesis concerns the design and construction of a closed-loop controlled matrix converter induction motor drive, using transputer parallel processors. The modulation algorithms used for the matrix converter are described. A 2.5 kW experimental matrix converter using IGBT switching devices has been constructed and tested. An analysis of the losses in the converter has been carried out and this gives good agreement with the measured losses. Two modulation algorithms, the Venturini algorithm and the scalar algorithm have been implemented in real-time on a network of parallel transputer processors. Experimental results are presented to compare the operation of these two algorithms. Open-loop constant V/F control of the matrix converter induction motor drive has been demonstrated. A controller has been designed to achieve closed-loop speed control of the drive system, employing the slip regulation technique. The experimental results under various operating conditions have verified the correct operation of both control systems. The indirect vector control technique has also been implemented. The results demonstrate the steady-state and transient performance as well as the regenerative operation of the drive system. The application of a matrix converter to a high performance induction motor servo drive rated at 2.5 kW with true four quadrant capability and minimum passive components has been demonstrated.
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Britten, Mark David. "Torque Controlled Drive for Permanent Magnet Direct Current Brushless Motors." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5252.
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This thesis describes the design and implementation of a simple variable speed drive (VSD) based on a brushless direct current (BLDC) machine and discrete logic circuits. A practical VSD was built, capable of operating a BLDC machine in two quadrants, motoring and regenerative braking. The intended applications are electric scooters and electric bicycles, where the recovered energy from braking extends the range of the vehicle. A conceptual four quadrant VSD, suitable for three and four wheelers requiring reverse operation, was designed and tested in simulation. Simplicity was emphasized in this design to help achieve a robust, easy to analyse system. The versatility of multi-function gate integrated circuits (ICs) made them ideal for implementing the commutation logic and keeping the system simple. The BLDC machine has sensors with a resolution of 60 ed to determine rotor position. An electronic commutator or phase switcher module interprets the position signals and produces a switching pattern. This effectively transforms the BLDC machine into a direct current (DC) brushed machine. A synchronous step down converter controls the BLDC machine current with a tolerance band scheme. This module treats the BLDC machine as if it was a DC machine. The leakage inductance of the electric machine is used as the inductive filter element. The unipolar switching scheme used ensures that current flows out of the battery only for motoring operation and into the battery only during regeneration. The current and torque are directly related in a DC brushed machine. The action of an electronic commutator or phase switcher creates that same relationship between torque and current in a BLDC machine. Torque control is achieved in the BLDC machine using a single channel current controller. The phase switcher current is monitored and used to control the duty ratio of the synchronous converter switches. Successful operation of the practical VSD was achieved in two quadrants: forwards motoring and forwards regenerating. The maximum tested power outputs were 236W in motoring mode and 158W in regenerating mode. The output torque could be smoothly controlled from a positive to a negative value. iv v Simulation of the conceptual four quadrant design was successful in all the motoring, generating and active braking zones. The required manipulation of logic signals to achieve this type of operation was done automatically while the machine was running. The resulting output torque is smoothly controlled in all of the operating zones. Commutation at certain speeds and torques are handled better by some topologies than others. Some current sensing strategies adversely affect instantaneous phase currents under certain conditions. The final design chose the method where phase currents experience no overshoot, minimizing component stress. The battery, or energy storage system, used in verifying the operation of the VSD in the practical electric bicycle was found to be the most limiting component. In regenerating mode, the low charge acceptance rate of the battery reduced the maximum retarding torque and energy recovery rate.
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Mujtaba, Ahmed. "Control scheme for electric drives based on synchronous reluctance machines with a non-linear MTPA controller." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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This dissertation focus on a Maximum Torque per Ampere (MTPA) control scheme for a non-linear synchronous reluctance motor (Sync-Rel). Due to the absence of permanent magnets, Sync-Rel motors have poor torque production capability and relatively low power factor. Therefore, it is important to maximize the torque given the maximum current of the power inverter.
In the classical solution to the MTPA control problem, the d-q current components are considered equal. This solution assumes a linear magnetic circuit for the Sync-Rel motor. In practical applications, the Sync-Rel motor has a non-linear magnetic core. As a consequence, the linear solution to the MTPA problem is not the best one anymore.
In this dissertation, we model a non-linear Sync-Rel motor using a simplified magnetic model, taking into account the magnetic saturation. Then, we design a non-linear MTPA controller. The Sync-Rel motor drive is simulated, and the performance of both linear and non-linear controller are compared.
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Truong, Benny. "Development of an active braking controller for brake systems on electric motor driven vehicles." Thesis, KTH, Maskinkonstruktion (Avd.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168706.
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Sumner, M. "Vector controlled induction motor drive using transputer parallel processors." Thesis, University of Nottingham, 1990. http://eprints.nottingham.ac.uk/14104/.
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This thesis describes the design and construction of a high performance induction motor drive, controlled by a network of parallel (INMOS) Transputer processors. The flexibility and high computational ability of the controller is demonstrated by the implementation of three forms of indirect vector control for the induction motor (here termed "V-Type, "V-Type with Current Feedback" and "I-Type") on two motor drive rigs. Results show that V-Type control with current feedback is superior, and that on-line parameter estimation (namely the rotor time constant) is required. The controller has been expanded to incorporate two parameter identification strategies for assessment. The first, termed "Reactive Power Measurement", has proved successful in matching the controller value of rotor time constant to the actual machine value of rotor time constant. The second, termed "PRBS Injection with Cross- Correlation" has proved inconclusive and is the subject of on-going research. The performance of the transputer parallel processing network for real time control is discussed. This assessment is felt to be significant since parallel architectures are likely to become increasingly exploited as the processors become cheaper, more powerful and flexible, and with enhanced system support.
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Mehmood, Chaudhry Arshad. "A New Methodology for the Design and Tuning of Robust PID Controllers in Electric Drives." Diss., North Dakota State University, 2014. https://hdl.handle.net/10365/27414.
Full textAbstract:
AC induction motor-drive systems are the backbone for numerous industrial
applications, such as aerospace, medical equipment, and nuclear power plants.
The control performance of electric drives is sensitive to several uncontrollable
disturbances from changes in ambient conditions in the form of machine parameter
variations such as: magnetizing inductance (Lm), and rotor resistance (Rr). Such
variations may trigger instability because of mismatch between the reference and
desired conditions. The most common techniques to solve the issue are: (a) gain
adaptation that requires instrumentation to monitor system, (b) nonlinear control
methods, such as sliding mode, feedback linearization, and (c) robust control method,
such as H?, and ?-analysis to account for motor uncertainties. Despite the prevalence
of PID controllers, a systematic method to tune their parameters to ensure robustness
remains an open problem. In this dissertation, a systematic method to tune PI controllers while factoring
uncertainties is developed. Two major design methods are proposed: (a) based on
Kharitonov?s theorem and (b) based on fractional order controllers. In (a), the
control design problem for AC drives can be cast into as a set of interval polynomials
that can be analyzed via Kharitonov?s theorem. Also proposed a method to solve
the resulting polynomials, which then yield the controller coefficients. In (b), we
show how fractional order controllers (FrOC)-a generalization of PID that consider
fractional values for the integral and derivative coefficients can be designed to achieve
our main objectives. A unique advantage of such controllers is the so-called isodamping
property (constant phase) and robustness. The performance of controllers is
assessed by comparing them with two well established techniques: traditional method
based on gain/phase margin requirements, and symmetric optimum techniques an
industrially popular technique that requires constant gain over a desired bandwidth. While both these techniques use reduced order models, the proposed methods are
advantageous because they can handle the full model of the machine. The simulation
results suggest that the proposed controllers remain robust against the chosen
uncertainties while both traditionally designed controllers succumb to instability. The
work paves a novel way for the design and tuning of robust PID controllers in electric
drives.
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Acar, Akin. "Implementation Of A Vector Controlled Induction Motor Drive." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1219286/index.pdf.
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High dynamic performance, which is obtained from dc motors, became achievable from induction motors with the recent advances in power semiconductors, digital signal processors and development in control techniques. By using field oriented control, torque and flux of the induction motors can be controlled independently as in dc motors. The control performance of field oriented induction motor drive greatly depends on the correct stator flux estimation. In this thesis voltage model is used for the flux estimation. Stator winding resistance is used in the voltage model. Also leakage inductance, mutual inductance and referred rotor resistance values are used in vector control calculations.
Motor control algorithms use motor models, which depend on motor parameters, so motor parameters should be measured accurately. Induction motor parameters may be measured by conventional no load and locked rotor test. However, an intelligent induction motor drive should be capable of identifying motor parameters itself.
In this study parameter estimation algorithms are implemented and motor parameters are calculated. Then these parameters are used and rotor flux oriented vector control is implemented. Test results are presented.
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Kanekal, Ramesh V. "Modeling, simulation and analysis of an indirect vector controlled induction motor drive." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76443.
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Vector control technique is being widely used in ac motors drives for precise dynamic control of torque, speed and position. The application of vector control scheme to the induction motor drive and the complete modeling, analysis and simulation of the drive system are presented in this thesis. State space models of the motor and the speed controller and the real time models of the inverter switches and the vector controller are integrated to model the drive. Performance differences due to the use of PWM and hysteresis current controllers are examined. Simulation results of the torque and speed drive systems are given. The drive system is linearised around an operating point and the small signal response is evaluated.Master of Science
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Ertek, Talip Murat. "Speed Estimation Techniques For Sensorless Vector Controlled Induction Motor Drive." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606863/index.pdf.
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This work focuses on speed estimation techniques for sensorless closed-loop speed control of an induction machine based on direct field-oriented control technique. Details of theories behind the algorithms are stated and their performances are verified by the help of simulations and experiments.
The field-oriented control as the vector control technique is mainly implemented in two ways: indirect field oriented control and direct field oriented control. The field to be oriented may be rotor, stator, or airgap flux-linkage. In the indirect field-oriented control no flux estimation exists. The angular slip velocity estimation based on the measured or estimated rotor speed is required, to compute the synchronous speed of the motor. In the direct field oriented control the synchronous speed is computed with the aid of a flux estimator. Field Oriented Control is based on projections which transform a three phase time and speed dependent system into a two co-ordinate time invariant system. These projections lead to a structure similar to that of a DC machine control. The flux observer used has an adaptive structure which makes use of both the voltage model and the current model of the machine.
The rotor speed is estimated via Kalman filter technique which has a recursive state estimation feature. The flux angle estimated by flux observer is processed taking the angular slip velocity into account for speed estimation. For closed-loop speed control of system, torque, flux and speed producing control loops are tuned by the help of PI regulators. The performance of the closed-loop speed control is investigated by simulations and experiments. TMS320F2812 DSP controller card and the Embedded Target for the TI C2000 DSP tool of Matlab are utilized for the real-time experiments.
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Buyukkeles, Umit. "Improved Torque And Speed Control Performance In A Vector-controlled Pwm-vsi Fed Surface-mounted Pmsm Drive With Conventional P-i Controllers." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614294/index.pdf.
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In this thesis, high performance torque and speed control for a surface-mounted permanent magnet synchronous machine (PMSM) is designed, simulated and implemented. A three-phase two-level pulse width modulation voltage-source inverter (PWM-VSI) with power MOSFETs is used to feed the PMSM.
The study has three objectives. The first is to compensate the voltage disturbance caused by nonideal characteristics of the voltage-source inverter (VSI). The second is to decouple the coupled variables in the synchronous reference frame model of the PMSM. The last is to design a load torque estimator in order to increase the disturbance rejection capability of the speed control. The angular acceleration required for load torque estimation is extracted through a Kalman filter from noisy velocity measurements.
Proposed methods for improved torque and speed control performance are verified through simulations and experimental tests. The drive system is modeled in Matlab/Simulink, and control algorithms are developed based on this model. The experimental drive system comprises a three-phase VSI and a 385 W surface-mounted PMSM. Control algorithms developed in the study have been implemented in a digital signal processor (DSP) board and tested comprehensively. With the use of the proposed methods, a considerable improvement of torque and speed control performance has been achieved.
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Antunes, Fernando Luiz Marcelo. "A microprocessor-controlled DC servo-drive with spill-over field weakening." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/33224.
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The thesis presents a speed-control scheme for a separately-excited DC motor using a microprocessor. The control strategy incorporates both armature-voltage control and spill-over field weakening. The armature voltage is controlled in closed loop using a lead term in series with an integral term. The analogue Lead-Integral (LI) controller parameters were obtained and optimised by observing the system time response in successive digital simulations. The parameters determined provide the motor with a fast response and minimum speed overshoot during transient operations. The analogue LI controller was emulated to form a digital filter using the bilinear transformation and implemented in a 16-bit microprocessor using floating point arithmetic.
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Séjean, Joseph. "Implementation of a biologically relevant gaze controller using sensory fusion and shared motor drives." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80141.
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The goal of this thesis is the analysis, implementation and testing of a binocular active vision system. The robotic head has six degrees of freedom: two independently actuated eyes can perform yaw and pitch movements. They are both mounted on a head also capable of yaw and pitch. The system uses both visual inputs, from two CCD cameras, and inertial input, from an angular velocity sensor, to track targets and hold gaze. This work is centered on the robotic head's binocular gaze controller: a simple method to modify the controller's parameters to reach specified dynamics is provided. The gaze controller, based on biological gaze control, can accommodate a wide range of movements: smooth pursuit, version, vergence, saccades, vestibulo-ocular reflex, gaze holding, and gaze control with an added head. Unlike other controllers that independently model each movement, the bilateral controller fuses sensory error signals to drive a single controller; the output drives to the different motors are also shared. All that is required is a simple switching strategy for transitions from slow phase to fast phase. Results illustrate the similarity between simulation and experimentation: this allows easy modification to the controller.
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Pai, Joseph Yuh-Shan. "The design and implementation of a microcomputer controlled CCD clock driver." Ohio University / OhioLINK, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1184072369.
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Grbovic, Petar. "Dispositif correcteur de facteur de puissance à base de super-condensateur pour variateur de vitesse." Thesis, Ecole centrale de Lille, 2010. http://www.theses.fr/2010ECLI0009/document.
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Les variateurs de vitesse modernes sont exclusivement basés sur l’utilisation de moteurs triphasés alimentés par des onduleurs à modulation de largeur d’impulsion (MLI). La plupart des applications modernes de la variation de vitesse, comme les ascenseurs, les grues et les machines-outils sont caractérisées principalement par un rapport élevé entre la puissance crête et la puissance moyenne et une forte demande de freinage à la puissance nominale. Dans les variateurs de vitesse ordinaires, l’énergie de freinage, qui est de l’ordre de 30 à 50% de l’énergie consommée, est dissipé dans une résistance. Outre les problèmes « énergétiques », les interruptions et dégradations de la tension d’alimentation ainsi que la qualité du courant d’entrée et la fluctuation de la charge, sont d’autres questions à aborder et à résoudre.Le super-condensateur dédié aux applications de conversion de puissance est ainsi proposé. Un variateur de vitesse équipé avec des super-condensateurs est présenté dans la thèse. Les super-condensateurs, interconnectés par un convertisseur DC-DC sont utilisés pour stocker et ré-injecter l'énergie de freinage. De plus, le convertisseur DC-DC contrôle le courant du redresseur et la tension du bus DC. Le THD du courant d’entrée est ramené à 30%. La tension du bus DC est élevée et en permanence contrôlée et lissée indépendamment de la charge et de la variation de la tension réseau. Pour terminer, les pics de puissance peuvent être lissés. La solution présentée est analysée théoriquement et vérifiée par un ensemble de simulations et expérimentations. Les résultats sont présentés et commentésModern controlled electric drives are exclusively based on three-phase motors that are fed from three-phase pulse width modulated (PWM) inverters. Most of modern controlled electric drive applications, such as lifts, cranes and tooling machines are characterized by high ratio of the peak to average power, and high demand for braking at the rated power. In ordinary drives, the braking energy, which represents 30-50% of the consumed energy, is dissipated on a braking resistor. Apart from the “energetic” issue, the mains interruption and degradation, the input current quality and the load fluctuation are additional issues to be addressed and solved.The ultra-capacitor dedicated for power conversion applications has been discussed. In comparison to electrochemical batteries, the ultra-capacitors have higher power density and efficiency, longer life time and greater cycling capability. This makes the ultra-capacitor an excellent candidate for power conversion applications.A new electric drive converter equipped with the ultra-capacitor is presented in the dissertation. The ultra-capacitor with an inter-connection dc-dc converter is used to store and recover the drive braking energy. Moreover, the dc-dc converter controls the rectifier current and the dc bus voltage. The drive input current THD is reduced to 30%. The dc bus voltage is boosted and controlled constant and ripple free regardless on the load and the mains voltage variation. Moreover, the drive input peak power can be smoothed. The presented solution is theoretically analysed and verified by set of simulations and experiments. The results are presented and discussed
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Kopeloff, Leonardo. "Modern control theory application in mill main drive design." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50037.
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Modern Control Theory is applied to analyze an existing aluminum mill drive, which was originally designed by Classical Methods.
The system is studied with Optimal Control and z-transform zero-pole locus tools.
The results and also the original design are compared with the performance of simulation. The models are built with the transition matrix and iterative procedures.
Conclusions about the appropriated design methods and improvements to the control scheme result from the investigation.Master of Science
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Namburu, Pradeep. "A TEMPERATURE-INSENSITIVE GATE-CONTROLLED WEIGHTED CURRENT DIGITAL-TO-ANALOG CONVERTER." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1270567830.
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Uddin, Mohammad Nasir. "Intelligent control of an interior permanent magnet synchronous motor drive." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0021/NQ55128.pdf.
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Chuang, Tzu-Shien. "A variable structure space voltage vector controlled switched reluctance flux vector drive." Thesis, University of Warwick, 1997. http://wrap.warwick.ac.uk/106984/.
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Through simulation and experimental investigation this thesis shows that (i) the switched reluctance motor is not different from any other motor in energy conversion theory but the difference is only in the structure and the operating characteristics; (ii) under high loads or high speeds the relative phase angle of the current with respect to the rotor pole must be advanced; (iii) the kinetic energy in the motor can be quickly returned to the d.c. link source or be transferred to other phase windings by the regenerative operation. A synchronous singly-excited control scheme is introduced to the switched reluctance motor. By this technology, a conventional current chopper can be used but the operating phase angle of the excited phase current must be limited. This approach makes the traditional switched reluctance drive become a high performance vector drive but a complex coordinate transformation is unnecessary making the implementation very simple. For multiply excited operation and for high power requirements, in order to achieve the sliding mode control of total phase power, a space vector controlled split-link converter is accomplished. A sliding mode speed controller with d.c. link power feedforward is added to the variable structure space vector controlled split-link converter to achieve a robust servo drive. The proposed switched reluctance drive can achieve fast and robust servo performance even under a high load and highly dangerous electric braking conditions.
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Jackson, Terry W. "Analysis and design of a novel controller architecture and design methodology for speed control of switched reluctance motors." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-11072008-063133/.
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Hold, Betina K. "FPGA driven synthesis employing a self-testing VLSI controller implementation as a case study." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22654.
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This thesis formulates, and implements an automotive Anti-lock Brake System (ABS), reporting on its design simulation, synthesis, and eventual layout steps, from which extensions are drawn towards digital onto controllers FPGA technology, and the potential migration of the design onto ASIC technology. Implementation/environment fine-tuning of embedded controllers as such necessitate quickly prototyped circuit realizations. Examination of its functionality, real-time response, implementation, and testability is performed in an attempt to measure the usefulness of higher level design entry facilities such as VHDL in a rapid prototyping environment. Continuous on-line testing is included using aperiodic sample injections where the resultant generated values are compared to signatures known a priori, without compromising functionality. The achievable area and timing aid in the determination of the efficiency of the process and provide fuel for an FPGA and/or ASIC migration path for eventual implementation. Commentaries and generalized methodologies are assembled from the design's simulation, synthesis and layout utilizing VHDL and FPGAs, illustrating CAD tool capabilities/requirements/limitations, with respect to real-time synthesis and rapid prototyping of general controller applications involving asynchronous elements. (Abstract shortened by UMI.)
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Ramachandran, Narayan Prasad. "Design of a 3.3 V analog video line driver with controlled output impedance." [College Station, Tex. : Texas A&M University, 2003. http://hdl.handle.net/1969.1/106.
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Thesis (M.S.)--Texas A&M University, 2003."Major Subject: Electrical Engineering" Title from author supplied metadata (record created on Jul. 18, 2005.) Vita. Abstract. Includes bibliographical references.
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Drake, Daniel James. "A dual-mode interpolating controller for the current loop of a thyristor DC drive." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315243.
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Le, Roux Ronnie Rikus. "An embedded controller for an active magnetic bearing and drive electronic system / by Rikus le Roux." Thesis, North-West University, 2009. http://hdl.handle.net/10394/3992.
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The North-West University is currently conducting research in the area of active magnetic bearings (AMBs). The aim of this research is to establish a foundation for the development of AMB systems to be used in industrial applications. These systems should be reliable, effective and economical. The main research objective for this project is to further develop key technologies in order to realize an economical, reliable high-speed AMB drive system to be used in high-speed machinery. The proposed system is the AMB and drive electronic system (ADES), which is a digital control system for controlling AMBs in an industrial environment. The development of the ADES was a group effort. The focus of this dissertation was on selecting and implementing a suitable controller to be used in the ADES. The specification for the ADES was obtained from an industrial high-speed helium blower system.
Selecting the controller was done by concurrently evaluating the conceptual main controller architectures and proposed system architectures. The system architecture is based on an industrial form factor, called compact peripheral component interconnect (PCI), or cPCI, which is an industrial version of PCI. The architectures were evaluated by performing trade-off studies and by weighing each architecture against a decision matrix, which weighs the architectures according to robustness, efficiency, cost, risk, reliability, flexibility and expandability. The selected system architecture includes a single board computer (SBC) with two PCI mezzanine cards (PMCs); a Virtex®-5 field programmable gate array (FPGA) based PMC module, for scheduling real-time tasks, and a Profibus PMC module, which will be used in future iterations of this project to interface the ADES with a programmable logic controller (PLC).
The specified functions were designed, verified and implemented on the selected controller. The digital control was implemented on the FPGA-embedded PowerPC whereas the communication and filters were implemented on the FPGA. The sensitivity analysis placed the system into zone C, which implies a system normally considered unsatisfactory for long-term continuous operation. The system may operate in this condition for a limited period, until a suitable opportunity arises for remedial action. It was also determined that the system is stable for a step-input added to the reference position. Due to the stability of the control, it was possible to suspend the rotor at its designed rating of 19,000 r/min, but due to the high sensitivity rating, prolonged operation at this speed is not recommended.
The selected architecture is versatile and powerful. The FPGA as a co-processor can be used to alleviate the load on the PowerPC, if additional features are required and not enough clock cycles are left on the PowerPC to implement them. The solution is compact, powerful and robust. These features, together with the industrial-based architecture of the system, make the ADES a suitable controller for controlling AMBs in an industrial system.Thesis (M.Ing. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2010
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Bennett, Nicholas. "A vector controlled AC drive incorporating an ultrasonic voltage source inverter and a permanent magnet synchronous machine." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240472.
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Vijayraghavan, Praveen. "Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/29799.
Full textAbstract:
Switched Reluctance Machines (SRMs) are receiving significant attention from industries in the last decade. They are extremely inexpensive, reliable and weigh less than other machines of comparable power outputs. Although the design principles of the machine are available as a concatenation of many different sources, the need for a unified, step-by-step design procedure from first principles of electromagnetics is an absolute requirement. This dissertation discusses a procedure that can be applied by engineers with a basic background in electromagnetics. Subsequent to the design of the machine, existing finite element software can do the analysis of the machine. However, this is a laborious process and the need for an analytical method is preferable to verify the design procedure before the final verification by finite elements. The analytical procedure as well as a procedure to calculate iron losses is also developed in this dissertation. A prototype machine has been developed as an example of the design process and an existing prototype is analyzed to verify the analysis procedure.
The similarities between the SRM and the Permanent Magnet Brushless DC Machine (PMDBC) beg the consideration of the development of a converter that can be used to drive either machine. One such converter has been developed in this dissertation. The design of the drive for both the machines is seen to be very similar. As a consequence, a universal controller that can be used to operate both machines has been developed and implemented with a DSP. Simulations and experimental correlation for both drives have been presented.Ph. D.
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Fuentes, Henríquez Esteban José [Verfasser], Ralph [Akademischer Betreuer] Kennel, and José [Akademischer Betreuer] Rodríguez. "Quasi-Time-Optimal Controllers for Electrical Drives / Esteban José Fuentes Henríquez. Gutachter: Ralph Kennel ; José Rodríguez. Betreuer: Ralph Kennel." München : Universitätsbibliothek der TU München, 2015. http://d-nb.info/1071651528/34.
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Wei, Haoming, Marius Grundmann, and Michael Lorenz. "Confinement-driven metal-insulator transition and polarity-controlled conductivity of epitaxial LaNiO3/LaAlO3 (111) superlattices." American Institute of Physics, 2016. https://ul.qucosa.de/id/qucosa%3A23553.
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Recently, topological conductivity has been predicted theoretically in LaNiO3(111)-based
superlattices. Here we report high-quality epitaxial LaNiO3/LaAlO3 superlattices on (111)-oriented
SrTiO3 and LaAlO3 single crystals. For both substrates a metal-insulator transition with decreasing
number of LaNiO3 monolayers is found. While the electrical transport is dominated by twodimensional
variable range hopping for superlattices grown on polar mismatched SrTiO3(111), it
switches to a thermally activated single gap behavior on polar matched LaAlO3(111). The gap
energy of the polar double-layer LaNiO3 superlattices can be tuned via the thickness of the insulating
LaAlO3 layers.
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Oliveira, Filho Milton Evangelista de. "Estudo e implementação de um controle de corrente para conversores em matriz e inversores fonte de tensão sem capacitor no elo de corrente contínua." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260741.
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Orientador: Ernesto Ruppert FilhoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-17T07:23:32Z (GMT). No. of bitstreams: 1 OliveiraFilho_MiltonEvangelistade_D.pdf: 4168469 bytes, checksum: 516ef4b8f97c81ba6af204cfc8a05d8c (MD5) Previous issue date: 2010
Resumo: A presente tese refere-se a um modelo de controle de corrente para conversores em matriz trifásico para trifásico e inversores fonte de tensão trifásica sem capacitor no elo de corrente continua com o objetivo minimizar e compensar as distorções presentes nas tensões de saída dos conversores de modo a obter correntes elétricas senoidais na carga. Nesses conversores, por não possuírem elementos armazenadores de energia de grandes valores, os desequilíbrios e/ou distorções presentes nas tensões de entrada irão se refletir nas tensões de saída. O modelo de controle de corrente proposto consiste em manter constante o módulo do vetor espacial das correntes de saída do conversor em matriz por meio de um regulador PI que altera dinamicamente a razão cíclica de acionamento das chaves de potência compensando os desequilíbrios e distorções das tensões trifásicas de entrada. O desempenho do controle proposto é validado por meio de simulações executadas no Matlab e em resultados experimentais obtidos no protótipo de um inversor fonte de tensão sem capacitor no elo de corrente continua alimentando uma carga RL trifásica
Abstract: This thesis concern a current control method for three-phase matrix converter and three-phase voltage source inverter without a dc link capacitor in order to mitigate and compensate the distortions present in the output voltages so that the output currents are sinosoidal. In these converters, because of lack of large storage elements, imbalances and/or distortions present in the input voltage will be immediately reflected to the converter output voltages. The proposed current control model forces the magnitude of the output space vector current to be constant through a PI controller that dynamically alters the duty cycle of the power converter switching for compensating the imbalances and distortions from input voltages. The performance of this current control is validated by simulations implemented in Matlab and experimental results on the prototype of a voltage source inverter without a DC link capacitor feeding a three-phase RL load
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
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Roshanghias, Daniel. "Evaluation and Implementation of a Longitudinal Control in a Platoon of Radio Controlled Vehicles." Thesis, KTH, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212564.
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Over the past decades, congestion and emission problems has increased remarkablywhich escalates the demands on vehicles. The advancements withinthe eld of information and communication systems gives the opportunity todeal with the aforementioned problems. The concept of platooning shows tobe an attractive way of reducing both congestion and emissions by having ashort inter-vehicle spacing. The ndings in studies show that fuel reductionpotentials of 5-20 % are viable as a result of the lowered air drag by drivingin platoon. This thesis investigates the state of the art within the areaof intelligent transport systems (ITS) along with advanced driver assistancesystems (ADAS). Furthermore, the prosecuted work results in a proposedcontrol design for a longitudinal control in a platoon of vehicles. The platoonconsists of two homogeneous radio controlled vehicles (RCV) which aremodelled by taking advantage of system identication methods. The identi-ed plant models are implemented into a Simulink model where the controlsystem is developed. Moreover, the developed control system is implementedinto a real-time demonstrator for experimental evaluation. The results showsthat the modelled dynamics corresponds reasonably well with the real dynamicsof the system. The developed control system proves to work well andagree with the expectations of its performance obtained from simulations.The performance of the proposed controller has been evaluated by means ofsimulations and real experiments. The resulting control system consists ofPID controllers for both speed and spacing control.Under de senaste decennierna har mangden trakstockningar och problemmed utslapp okat - darmed aven kraven pa vara fordon. Samtidigt skaparframstegen inom informations- och kommunikationssystem mojligheter foratt hantera ovannamnda problem. Kolonnkorning, eller platooning har visatsig vara en eektiv metod for att minska saval trakstockningar som utslappsom en foljd av kortare avstand mellan fordon. Resultat fran studier visarhur en branslereduktion runt 5-20 % ar mojlig till foljd av det sankta luftmotstandet vid kolonnkorning. Avhandlingen undersoker teknikens standpunktinom intelligenta transportsystem (ITS) tillsammans med avancerade drivhjalpsystem(ADAS). Vidare resulterar arbetet i ett forslag till regleringsdesignfor en longitudinell kontroll i en kolonn av fordon. Kolonnen bestar av tvahomogena radiostyrda fordon (RCV) som modelleras genom att utnyttjametoder for systemidentiering. De identierade systemmodellerna implementerasi en Simulink-modell dar styrsystemet utvecklas. Dessutom implementerasdet utvecklade styrsystemet i en realtids-demonstration for experimentellutvardering. Resultaten visar att den modellerade dynamikenstammer bra overens med systemets verkliga dynamik. Det utvecklade styrsystemetvisar sig fungera bra och overensstammer med forvantningarna pa dessprestanda som erhallits genom simuleringar. Den foreslagna regulatorns prestandahar utvarderats med hjalp av simuleringar och verkliga experiment.Det resulterande styrsystemet bestar av PID regulatorer for bade hastighetsochavstandskontroll.
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Azcue, Puma José Luis 1981. "Estratégias de controle direto de torque para motores de indução trifásicos usando controladores fuzzy tipo Takagi-Sugeno e controladores por modos deslizantes." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260745.
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Orientador: Ernesto Ruppert Filho, Alfeu Joãozinho Sguarezi FilhoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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Resumo: Na presente tese de doutorado propõe estratégias de controle por orientação direta de campo (FOC direto) e de controle direto de torque (CDT) com emprego de controladores fuzzy do tipo Takagi-Sugeno (fuzzy T-S). Propõe-se também, uma estratégia de CDT baseado no controle do ¿angulo de carga com o emprego do controle por modos deslizantes (CDT-CMD). As estratégias de controle vetorial propostas são utilizadas para o controle de alto desempenho do motor de indução trifásico. O controlador fuzzy T-S proposto utiliza uma única base de regras para gerar as componentes de eixo direto e de quadratura do vetor espacial da tensão do estator. Isto simplifica a estrutura do controlador fuzzy T-S e em consequência diminui o custo computacional e seu tempo de processamento. Na estratégia de CDT com o controle por modos deslizantes o esforço de controle é sempre o máximo possível no sentido de reduzir os erros do torque e do fluxo. Assim, é possível obter uma resposta rápida no controle do fluxo e do torque. Os resultados de simulação e experimentais são apresentados para validarem as propostas desta tese de doutorado. Os controladores apresentaram um desempenho dinâmico satisfatório pois as referências de torque e de fluxo foram atendidas. Todos os resultados obtidos mostraram-se compatíveis com os resultados apresentados na literatura, validando as estratégias de CDT e de FOC direto propostas
Abstract: This thesis proposes a direct field oriented control (D-FOC) and direct torque control (DTC) strategies with Takagi-Sugeno fuzzy controllers (T-S fuzzy). Also it proposes a DTC strategy based on load angle control with the use of sliding mode control (DTC-SMC). The proposed vector control strategies are used for high performance control of three-phase induction motor. The proposed T-S fuzzy controller uses a single rule base to generate the direct-axis and quadrature-axis components of the stator voltage space vector. This simplifies the structure of the T-S fuzzy controller and consequently it reduces the computational cost and its processing time. However, in the sliding mode control the control effort is always the maximum possible in order to reduce the errors of the torque and the flux. Hence, it is possible to get a fast response in the control of the torque and the flux. The proposed controllers showed a good dynamic performance because the references were achieved. The experimental and simulation results of the vector control strategies were presented to validate the proposed controllers. All the obtained results were consistent with the results reported in the literature, validating the proposed DTC and D-FOC strategies
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
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Green, Clayton R. "MODELING AND TEST OF THE EFFICIENCY OF ELECTRONIC SPEED CONTROLLERS FOR BRUSHLESS DC MOTORS." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1459.
Full textAbstract:
Small electric uninhabited aerial vehicles (UAV) represent a rapidly expanding market requiring optimization in both efficiency and weight; efficiency is critical during cruise or loiter where the vehicle operates at part power for up to 99% of the mission time. Of the four components (battery, motor, propeller, and electronic speed controller (ESC)) of the electric propulsion system used in small UAVs, the ESC has no accepted performance model and almost no published performance data. To collect performance data, instrumentation was developed to measure electrical power in and out of the ESC using the two wattmeter method and current sense resistors; data was collected with a differential simultaneous data acquisition system. Performance of the ESC was measured under different load, commanded throttle, bus voltage, and switching frequency, and it was found that ESC efficiency decreases with increasing torque and decreasing bus voltage and does not vary much with speed and switching frequency. The final instrumentation was limited to low-voltage systems and error propagation calculations indicate a great deal of error at low power measurements; despite these limitations, an understanding of ESC performance appropriate for conceptual design of these systems was obtained.
MODELING AND TEST OF THE EFFICIENCY OF ELECTRONIC SPEED CONTROLLERS FOR BRUSHLESS DC MOTORS