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1
Chretien, Ludovic. "POSITION SENSORLESS CONTROL OF NON-SALIENT PERMANENT MAGNET SYNCHRONOUS MACHINE." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1145286531.
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Doolittle, Randy Gene. "Noise reduction control strategy of a permanent magnet synchronous machine for vehicle applications." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2718.
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Zheng, Liping. "SUPER HIGH-SPEED MINIATURIZED PERMANENT MAGNET SYNCHRONOUS MOTOR." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3552.
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This dissertation is concerned with the design of permanent magnet synchronous motors (PMSM) to operate at super-high speed with high efficiency. The designed and fabricated PMSM was successfully tested to run upto 210,000 rpm The designed PMSM has 2000 W shaft output power at 200,000 rpm and at the cryogenic temperature of 77 K. The test results showed the motor to have an efficiency reaching above 92%. This achieved efficiency indicated a significant improvement compared to commercial motors with similar ratings. This dissertation first discusses the basic concept of electrical machines. After that, the modeling of PMSM for dynamic simulation is provided. Particular design strategies have to be adopted for super-high speed applications since motor losses assume a key role in the motor drive performance limit. The considerations of the PMSM structure for cryogenic applications are also discussed. It is shown that slotless structure with multi-strand Litz-wire is favorable for super-high speeds and cryogenic applications. The design, simulation, and test of a single-sided axial flux pancake PMSM is presented. The advantages and disadvantages of this kind of structure are discussed, and further improvements are suggested and some have been verified by experiments. The methodologies of designing super high-speed motors are provided in details. Based on these methodologies, a super high-speed radial-flux PMSM was designed and fabricated. The designed PMSM meets our expectation and the tested results agree with the design specifications. 2-D and 3-D modeling of the complicated PMSM structure for the electromagnetic numerical simulations of motor performance and parameters such as phase inductors, core losses, rotor eddy current loss, torque, and induced electromotive force (back-EMF) are also presented in detail in this dissertation. Some mechanical issues such as thermal analysis, bearing pre-load, rotor stress analysis, and rotor dynamics analysis are also discussed. Different control schemes are presented and suitable control schemes for super high- speed PMSM are also discussed in detail.Ph.D.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical Engineering
4
Örnkloo, Johannes. "Comparison between active and passive rectification for different types of permanent magnet synchronous machines." Thesis, Uppsala universitet, Elektricitetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-370121.
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When using an intermittent source of energy such as wind power together with a synchronous machine a frequency converter system is needed to decouple the generator from the grid, due to the fluctuations in wind speed resulting in fluctuating electrical frequency. The aim of this master's thesis is to investigate how different types of rectification methods affect permanent magnet synchronous machines of different saliency ratios. A literature study was carried out to review the research within the area and to acquire the necessary knowledge to carry out the work. Two simulation models were created that include a permanent magnet synchronous generator driven by a wind turbine and connected to the grid via a frequency converter, where one model utilizes active rectification and one utilizes passive rectification. The simulation models were verified by carrying out an experiment on a similar setup, which showed that the simulation results coincide well with the results of the experiment. The results of the simulation study were then used to compare the rectification systems as well as investigate the affect that rotor saliency has on the system. It was shown that the active rectification provided a higher efficiency than the passive rectification system, however the saliency of the rotor had little effect on the system
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Lennartsson, Alexander, and Martina Blomberg. "Fault Detection in Permanent Magnet Synchronous Motors using Machine Learning." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84909.
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In the aviation industry, safety and robustness are the number one priorities, which is why they use well-tested systems such as hydraulic actuators. However, drawbacks such as high weight and maintenance have pushed the industry toward newer, electrical, actuators that are more efficient and lighter. Electrical actuators, on the other hand, have some reliability issues. In particular, short circuits in the stator windings of Permanent-Magnet SynchronousMotors (PMSMs), referred to as Inter-Turn Short Faults (ITSFs), are the dominating faults, and is the focus of this thesis. ITSFs are usually challenging to detect and often do not become noticeable until the fault has propagated, and the motor is on the verge of being destroyed. This thesis investigates the possibility of detecting ITSFs in a PMSM, at an early stage when only one turn is shorted. The method is limited to finding the faults using ML algorithms. Both an experiential PMSM and a simulated model of the experimental PMSM, with the ability to induce an ITSF, were used to collect the data. Several Machine Learning (ML) models were developed, and then trained and tested with the collected data. The results show that four of the tested ML models, being: Random Forest, Gaussian SVM, KNN, and the CNN, all achieve an accuracy exceeding 95%, and that the fault can be found at an early stage in a PMSM with three coils connected in parallel in each phase. The results also show that the ML models are able to identify the ITSF when the simulated data is downsampled to the same frequency as the experimental data. We conclude that the ML models, provided in this study, can be used to detect an ITSF in a simulated PMSM, at an early stage when only one turn is shorted, and that there is great potential for them to detect ITSFs in a physical motor as well.
6
Ahmed, Adeeb. "Maximum Torque per Ampere (MTPA) Control for Permanent Magnet Synchronous Machine Drive System." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1375726072.
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Pina, Ortega Alejandro Jose. "Modeling and Analysis of Asymmetries in Permanent Magnet Synchronous Machines." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099.
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Chi, Song. "Position-sensorless control of permanent magnet synchronous machines over wide speed range." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1186974583.
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Islam, Mohammed Rakibul. "Cogging Torque, Torque Ripple and Radial Force Analysis of Permanent Magnet Synchronous Machines." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239038005.
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Meinguet, Fabien. "Fault-tolerant permanent-magnet synchronous machine drives: fault detection and isolation, control reconfiguration and design considerations." Doctoral thesis, Universite Libre de Bruxelles, 2012. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209757.
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The need for efficiency, reliability and continuous operation has lead over the years to the development of fault-tolerant electrical drives for various industrial purposes and for transport applications. Permanent-magnet synchronous machines have also been gaining interest due to their high torque-to-mass ratio and high efficiency, which make them a very good candidate to reduce the weight and volume of the equipment.In this work, a multidisciplinary approach for the design of fault-tolerant permanent-magnet synchronous machine drives is presented.
The drive components are described, including the electrical machine, the IGBT-based two-level inverter, the capacitors, the sensors, the controller, the electrical source and interfaces. A literature review of the failure mechanisms and of the reliability model of most of these components is performed. This allows understanding how to take benefit of the redundancy generally introduced in fault-tolerant systems.
A necessary step towards fault tolerance is the modelling of the electrical drive, both in healthy and faulty operations. A general model of multi-phase machines (with a number of phases equal to or larger than three) and associated converters is proposed. Next, control algorithms for multi-phase machines are derived. The impact of a closed-loop controller upon the occurrence of faults is also examined through simulation analysis and verified by experimental results.
Condition monitoring of electrical machines has expanded these last decades. New techniques relying on various measurements have emerged, which allow a better planning of maintenance operations and an optimization of the uptime of electrical machines. Regarding drives, a number of sensors are inherently present for control and basic protection functions. The utilization of these sensors for advanced condition monitoring is thus particularly interesting since they are available at no cost.
A novel fault detection and isolation scheme based on the available measurements (phase currents, DC-link voltage and mechanical position) is developed and validated experimentally. Change-detection algorithms are used for this purpose. Special attention is paid to sensor faults as well, what avoids diagnosis errors.
Fault-tolerant control can be implemented with passive and active approaches. The former consists in deriving a control scheme that gives acceptable performance for all operating conditions, including faulty conditions. The latter consists in applying dedicated solutions upon the occurrence of faults, i.e. by reconfiguring the control. Both approaches are investigated and implemented.
Finally, design considerations are discussed throughout the thesis. The advantages and drawbacks of various topologies are analyzed, which eventually leads to the design of a five-phase fault-tolerant permanent-magnet synchronous machine.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
11
Liu, Tianyi. "Control strategy for a mono-inverter multi-PMSM system - Stability and efficiency." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19624/7/tianyi_liu.pdf.
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During these decades, Permanent Magnet Synchronous Motor (PMSM) has become a vital part of military, industry and civil applications due to the advantages of high power density, high efficiency, high reliability and simple structure, small volume and light weight. Sometimes, multiple PMSMs are used to carry out cooperative functions. For example, the bogie of a locomotive, the flight control surface of an airplane. These PMSMs usually operates at the same speed. To reduce the volume and weight, an idea of sharing the static power conversion devices, which is called Mono-Inverter Multi-PMSM system (MIMPMSM), is raised. Although many researchers have given different controller solutions for the MIMPMSM system, most of them are not clear in the aspects of system stability and efficiency issues. This has become the biggest obstacle to the practical use of MIMPMSM. Oriented with these problems, starting with a MIMPMSM system with 2 motors, in the first step, we have tested some control strategies by an experiment to verify the feasibility and performance of them. In final, based on the experiment data, we have figured that the overconstraint problem exists in some control strategies. Then, an analysis and controller design based on steady-state model of a Mono-Inverter Dual-PMSM (MIDPMSM) system is carried out.By studying the solution existence problem of the steady-state model, we give out the design guideline to the controller structure. Combining the open-loop stability and steady-state solution, the region of controllability and stability is obtained. Lagrange Multiplier is used develop theexpression of efficiency-optimal steady-staterelated to torque and speed. The experiment has shown that the efficiency of the new controller has improved significantly. Meanwhile, we have explored the influence of parameter variation in system stability and efficiency-optimization. The variation will influence the stability region. But its influence can be eliminated by using Master- Slave strategy. On the other hand, in the aspect of efficiency optimization, the simulation results have shown that parameter mismatch, especially the permeant flux, can cause high efficiency loss. In the last step, this controller is also adapted to a MIMPMSM system with more than two motors. The simulation results demonstrate the effectiveness.
12
Ozturk, Salih Baris. "Modelling, simulation and analysis of low-cost direct torque control of PMSM using hall-effect sensors." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/4905.
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This thesis focuses on the development of a novel Direct Torque Control (DTC) scheme for permanent magnet (PM) synchronous motors (surface and interior types) in the constant torque region with the help of cost-effective hall-effect sensors. This method requires no DC-link sensing, which is a mandatory matter in the conventional DTC drives, therefore it reduces the cost of a conventional DTC of a permanent magnet (PM) synchronous motor and also removes common problems including; resistance change effect, low speed and integration drift. Conventional DTC drives require at least one DC-link voltage sensor (or two on the motor terminals) and two current sensors because of the necessary estimation of position, speed, torque, and stator flux in the stationary reference frame. Unlike the conventional DTC drive, the proposed method uses the rotor reference frame because the rotor position is provided by the three hall-effect sensors and does not require expensive voltage sensors. Moreover, the proposed algorithm takes the acceleration and deceleration of the motor and torque disturbances into account to improve the speed and torque responses. The basic theory of operation for the proposed topology is presented. A mathematical model for the proposed DTC of the PMSM topology is developed. A simulation program written in MATLAB/SIMULINKî is used to verify the basic operation (performance) of the proposed topology. The mathematical model is capable of simulating the steady-state, as well as dynamic response even under heavy load conditions (e.g. transient load torque at ramp up). It is believed that the proposed system offers a reliable and low-cost solution for the emerging market of DTC for PMSM drives. Finally the proposed drive, considering the constant torque region operation, is applied to the agitation part of a laundry washing machine (operating in constant torque region) for speed performance comparison with the current low-cost agitation cycle speed control technique used by washing machine companies around the world.
13
Awawda, Lama. "Design of an Electric Motor (PMSM) and Manufacturing Lab." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20118.
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The thesis presents deals with the design, analysis, test and control of permanent magnetsynchronous motor(PMSM).An analytical model was carried out based on the d-q frame and the equivalent circuit of PMSM, theanalytical model gives an approximation value of the machine parameters and is carried out byequations from the listed references. this phase includes many iteration steps, once the results wereobtained they were compared with the motor specifications and if they don’t match the requiredspecifications the process must be done again until the desired design is obtained.Once the analytical model is obtained a Finite Element Simulation was carried out using FEMMsoftware to validate the design, in the FEM analysis in this phase the machine designed in theanalytical model is analyzed, once the simulation is done the results from both models are comparedand discussed in the results chapter.It’s important to mark that during the design phase some design parameters were affected andlimited by some factor, for example, the air gap length has been magnified due to manufacturinglimits.
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Awawda, Lama. "Design of an electric motor (PMSM) & manufacturing lab." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-20118.
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The thesis presents deals with the design, analysis, test and control of permanent magnetsynchronous motor(PMSM). An analytical model was carried out based on the d-q frame and the equivalent circuit of PMSM, theanalytical model gives an approximation value of the machine parameters and is carried out byequations from the listed references. this phase includes many iteration steps, once the results wereobtained they were compared with the motor specifications and if they don’t match the requiredspecifications the process must be done again until the desired design is obtained. Once the analytical model is obtained a Finite Element Simulation was carried out using FEMMsoftware to validate the design, in this phase the designed machine in the analytical model isanalyzed and validated, once the simulation is done the results from both models are compared anddiscussed in the results chapter. It’s important to mark that during the design phase some design parameters were affected andlimited by some factors, for example, the air gap length has been magnified due to manufacturinglimits. The manufacturing process and the prototype building have been started once the optimal designwas selected, the manufacturing process was explained and a comparison study was made to selectthe best manufacturing process suitable and available for this thesis.
15
Briggner, Viktor. "Design and comparison of PMaSynRM versus PMSM for pumping applications." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235279.
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This master thesis aimed to design a permanent magnet assisted synchronous reluctancemachine (PMaSynRM) rotor for pump applications which were to be implemented inan existing Induction Machine stator. The machine were to be compared with a similarpermanent magnet synchronous machine (PMSM) with similar torque production in termsof cost and performance.This thesis goes through the theory of the Synchronous Reluctance Machine andthe Permanent Magnet assistance. A rotor was designed by utilizing existing design approachesand simulation of performance by use of finite element analysis. A demagnetizationstudy was conducted on the added permanent magnets in order to investigate thefeasiblity of the design.The final design of the PMaSynRM was thereafter compared to the equivalentsurface-mounted PMSM in terms of performance and cost. The performance parameterswas torque production, torque ripple, efficiency and power factor. Due to the lower torquedensity of the PMaSynRM, for equal torque production the PMSM had a 40% shorterlamination stack than the PMaSynRM.The economic evaluation resulted in that when utilizing ferrite magnets in the PMa-SynRM it became slightly cheaper than the PMSM, up to 20%. However, due to the fluctuatingprices of NdFeB magnets, there exist breakpoints below which the PMaSynRM isin fact more expensive than the PMSM or where the price reduction of the PMaSynRMis not worth the extra length of the motor. However, it was shown that the PMaSynRMis very insensitive to magnet price fluctuations and thereby proved to be a more securechoice than the PMSMDetta examensarbete avsåg att designa en rotor till en permanentmagnetsassisteradsynkron reluktansmaskin (PMaSynRM) för pumpapplikationer, vilken skulle implementeras i en befintlig asynkronmaskin (IM) stator. Maskinen jämfördes ekonomiskt och prestandamässigt med en liknande synkronmaskin med permanentmagneter (PMSM) med jämförbar vridmomentsproduktion.Uppsatsen avhandlar teorin bakom synkrona reluktansmaskiner och konceptet kring permanentmagnetassistans. Rotorn designades genom användandet av befintliga designmetoder och simulering genom finit elementanalys (FEA). En avmagnetiseringsstudie utfördes på de adderade magneterna för att undersöka rimligheten kring designenDen slutgiltiga designen av PMaSynRMen jämfördes därefter mot den jämlika PMSMen i termer om prestanda och kostnad. De undersökta prestandaparameterarna var vridmoment, vridmomentsrippel, verkningsgrad och effektfaktor. Eftersom vridmomentsdensiteten i en PMaSynRM är lägre än hos en PMSM så visade sig PMSMen ha en 40% kortare lamineringskropp än PMaSynRMen vid jämnlik vridmomentsproduktion.Den ekonomiska utvärderingen resulterade i att vid användandet av ferritmagneter i PMaSynRMen så blev den något billigare än PMSMen, upp till 20%. På grund av fluktuerande priser hos NdFeB magneter, så finns det brytpunkter där PMaSynRMen faktiskt blir dyrare än PMSMen eller då kostnadsreduktionen för PMaSynRMen kan bedömas att vara för låg med tanke på den ökade längden och vridmomentsrippel. Däremot visades det att PMaSynRMen är väldigt okänslig för prisvariationer och därför visades vara ettkostnadsmässigt tryggare val än PMSMen
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Kruger, Gert Lodewikus. "Implementation and evaluation of V/f and vector control in high–speed PMSM drives / Kruger G.L." Thesis, North-West University, 2011. http://hdl.handle.net/10394/7609.
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The McTronX research group, at the Potchefstroom campus of the North–West University, has
been researching Active Magnetic Bearings (AMBs). A fully suspended, flywheel energy storage
system (FESS) has been developed. Due to excessive unbalance on the rotor, the motor drive
could not be tested up to its rated speed. In the interim, until the rotor can be balanced and
other rotor dynamic effects have been investigated, the group decided that the existing drive
control should be improved and tested on a high–speed permanent magnet synchronous motor
(PMSM), using normal roller element bearings.
In order to test the motor control a second (identical) PMSM, mechanically coupled to the
former, operates in generator mode which serves as the torque load. Two different control algorithms,
namely V/f and vector control, are designed and implemented on a rapid control
prototyping system, i.e. dSPACE®. The V/f control is an open–loop, position sensorless technique,
whilst the vector controller makes use of a position sensor.
From the design and implementation it became clear that the vector control is more robust,
in the sense that it is less sensitive on parameter variations and disturbances. It can start up
reliably even under full load conditions.
The V/f control is an attractive alternative to the vector control, especially in AMB systems,
where it may be difficult to mount the position sensor, has to operate in a hazardous environment
not suited to the sensor or could degrade the reliability of the AMB system. The cost of the
position sensor is not really a concern compared to the cost of an AMB system. The V/f control
is more suited to fan and pump applications, which has a low dynamic requirement. The V/f
control has high startup currents and is not recommended for applications requiring a high
starting torque or fast acceleration during operation.
The inverter, which drives the PMSM, also had to be developed. With regard to the motor
control, the effects of inverter non–idealities had to be accounted, especially for the V/f control.
The implemented control algorithms were tested up to 20 krpm. Discrepancies between the expected
and actual results are discussed. Overall, the controllers performed as desired. Generally,
the project goals have been reached satisfactorily.Thesis (M.Ing. (Computer and Electronic Engineering))--North-West University, Potchefstroom Campus, 2011.
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Singh, Aditya Pratap. "Concept Population & Verification of Traction Motors." Thesis, KTH, Fordonsdynamik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302129.
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The electrification of automobiles has emerged as the sustainable powertrain solutionto meet United Nations sustainable development goals of sustainable cities andcommunities, affordable and clean energy, and climate action. The success of theelectrification depends on the efficiency of traction motors. Hence, the automobileindustry is dedicated to improving the performance of electrical traction machinesfor high performance and sustainability. The thesis aims to build various electricalmachine’s concept designs and quantify their behaviour on sustainability andperformance. The thesis objective is to design Permanent Magnet Synchronous Motor (PMSM),Synchronous Reluctance Motor (SynRM), and Permanent Magnet SynchronousReluctance Motor (PMSynRM). The thesis work comprises of accurate performanceestimation and optimisation of these electrical machines through a finite element based method. The inhouse scripts are developed to estimate the performance, electrical losses, and efficiency of these electrical machines through flexible open-source tools. The performance of PMSM with rare-earth magnet Neodymium Ferrite Boron(NdFeB) and without rare-earth magnet (ferrite) is done to evaluate the role of bothmagnets in producing torque density. The SynRM is evaluated and optimized usinggenetic algorithms in the thesis. The electrical machines are designed without the useof rare-earth magnets to eliminate the degradation of the environment and reduce thecost and weight of the motor.The electrification of automobiles has emerged as the sustainable powertrain solutionto meet United Nations sustainable development goals of sustainable cities andcommunities, affordable and clean energy, and climate action. The success of theelectrification depends on the efficiency of traction motors. Hence, the automobileindustry is dedicated to improving the performance of electrical traction machinesfor high performance and sustainability. The thesis aims to build various electricalmachine’s concept designs and quantify their behaviour on sustainability andperformance. The thesis objective is to design Permanent Magnet Synchronous Motor (PMSM),Synchronous Reluctance Motor (SynRM), and Permanent Magnet SynchronousReluctance Motor (PMSynRM). The thesis work comprises of accurate performanceestimation and optimisation of these electrical machines through a finite element based method. The inhouse scripts are developed to estimate the performance, electrical losses, and efficiency of these electrical machines through flexible open-source tools. The performance of PMSM with rare-earth magnet Neodymium Ferrite Boron(NdFeB) and without rare-earth magnet (ferrite) is done to evaluate the role of bothmagnets in producing torque density. The SynRM is evaluated and optimized usinggenetic algorithms in the thesis. The electrical machines are designed without the useof rare-earth magnets to eliminate the degradation of the environment and reduce thecost and weight of the motor. Sammanfattning på svenska / Abstract in Swedish Elektrifieringen av bilar har framstått som en hållbar drivlinelösning för att mötaFörenade Nationernas hållbara utvecklingsmål för hållbara städer och samhällen, medprisvärda och rena energi och klimatåtgärder. Framgången med elektrifieringen berorpå effektivitet på motorer för framdrivningen. Därför är bilindustrin dedikerad tillatt förbättra prestanda för elmotorer för hållbarhet och hög prestanda. Avhandlingensyftar till att bygga olika konceptdesign för elmotorer för framdrivning och kvantifieraderas beteende på hållbarhet och prestanda. Uppsatsmålet är att utforma Permanent Magnet Synchronous Motor (PMSM),Synchronous Reluktance Motor (SynRM) och permanent magnetassisterad SynRM(PMSynRM). Examensarbetet består av noggrann prestationsuppskattning ochoptimering av dessa elektriska maskiner genom finit element metod (FEM). Deskripten för att hantera FEM för elektormagnetisk design är inhouse utveckladeför att uppskatta flexibelt prestanda, elektriska förluster och effektiviteten hos dessaelektriska maskiner genom att använda öppen källkod. Prestanda för PMSM med en sällsynta jordartsmagnet (NdFeB) och PMSM utansällsynta jordartsmagnet (ferrit) räknades fram för att utvärdera båda magneternasroll för att producera vridmomentdensitet. SynRM och PMSynRM maskinernautvärderas och optimeras med hjälp av genetiska algoritmer i avhandlingen.De studerade elektriska maskinerna är designad utan användning av sällsyntajordartsmagneter för att eliminera miljöförstöring och minska motorns kostnad ochvikt.
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Ge, Yuxue. "Energy Management in More Electric Aircraft through PMSM Fault Diagnosis, Adaptive Load Shedding and Efficient Aircraft Design." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/287798/5/contratYG.pdf.
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More electric aircraft is an electrification scheme of aircraft system with high technical feasibility and good economy. It can reduce the weight of aircraft structure, improve maintenance efficiency and reduce fire hazards. However, the electrification of aircraft system will drastically increase the proportion of electrical equipment, the total power demand and the difficulty of fault diagnosis. This paper uses the energy management method to take up the challenge, with focus on fault diagnosis of permanent-magnet synchronous machines (PMSMs), adaptive load shedding and energy efficient aircraft design. A literature review of the concept evolution from all/more-electric aircraft to energy-optimized aircraft is presented. The main issues of the aircraft electrification process are summarized, and followed by an introduction to the current research and methods. The model of the aircraft electrical system is qualitatively and mathematically recalled, including the generator, the battery, the DC motor, the AC motor, and the electric power converter. The accuracy and computation cost of the aircraft model depends on the complexity of the subsystem models that are involved. Therefore, the level of detail that is necessary for a good precision-versus-simulation-time ratio is discussed by taking the electric system of an industrial level hybrid energy quadcoptor UAV as an example. The analysis shows that the bi-directional instruments, i.e. the electric machine, should be modeled in details while other components can be simplified. PMSMs are a group of on-board electric machines with promising future prospects because of high power density and stability. The model of PMSMs is further developed in this work, especially in the inter-turn and phase-to-phase short-circuit conditions. In case of inter-turn short-circuit fault, a winding-function-based and a fault-current-based model are separately developed. The accuracy of both models are verified and compared through experimental results. The fault-current-based modeling method is applied to the phase-to-phase short-circuit fault and experimentally examined and discussed. General condition monitoring methods require the use of a large number of sensors. A fault detection and isolation method that can have low requirement of sensor is recalled and inherited. The description of the fault phase identification index using this method is relatively imprecise, which is not applicable to the inter-turn short-circuit fault. In this work, the analytical expression of the faulty phase identification index is derived based on the fault models. A method to isolate inter-turn and phase-to-phase short-circuit faults is proposed by a combination of the current- and the voltage-signature residuals. This development expands the application scope of the original fault detection and isolation tool and improves its accuracy. The validity of this fault diagnosis method has been verified by experimental results.Load management is developed to guarantee the normal operation of critical loads by shedding some other loads in case of emergency. Generally, binary decisions are made: either something has gone wrong or everything is fine. However, different types of fault influence the working performance of the load and the entire network in different ways. There are multiple states between totally wrong and pure fine, and the load management decision should be adaptive to each state. In this work, fuzzy logic method is used to degrade the load priority according to the instantaneous working state. Combining it with the fault detection and isolation process, a fault-tolerant adaptive load management is achieved. Finally, this work discusses the aircraft design from the energy management point of view, which consists of the energy efficiency analysis and the multidisciplinary energy efficient design of the integrated aircraft system. The first thermodynamic efficiency has been widely used as a common parameter for depicting the energy utilization, i.e. the ratio of output to input power of the system. However, it ignores the irreversible increase of the entropy and cannot reveal the upper limit of the available work of the system.Based on the second thermodynamic law, this work uses the exergy parameters to analyze the energy utilization of a MEA design scheme. Based on the exergy analysis, an energy-efficient aircraft design method is proposed by optimizing the exergy lost of the whole design. The method could provide a global optimization reference for the integrated aircraft design of a MEA.Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
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Chetangny, Patrice Koffi. "Calcul des pertes magnétiques par courants de Foucault dans les aimants permanents des MSAP." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD026.
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Le travail présenté dans cette thèse s’inscrit dans le cadre de différents programmes de recherches sur la modélisation et la conception des machines synchrones à aimants permanents, pour des applications de transports terrestres. En effet, la tendance actuelle, que ce soit dans la traction ferroviaire, ou dans les véhicules électriques et/ou hybrides électriques, est d’utiliser de tels moteurs pour leurs grandes performances massiques et leur bon rendement. Cette tendance est également observable dans les grandes éoliennes à attaque directe. Toutefois, un inconvénient de ces machines est l’existence de pertes pouvant être importantes dans les aimants permanents. Ces pertes sont d’une part à l’origine d’une dégradation du rendement, mais elles peuvent aussi être à l’origine d’échauffements excessifs des aimants, avec des risques de désaimantation d’une part et des risques de décollement d’autre part. Dans ce contexte, l’objectif de notre travail de thèse a été d’établir de nouveaux modèles, plus précis, des pertes par courants de Foucault dans les aimants. Les modèles utilisés actuellement sont généralement des modèles bidimensionnels qui ignorent donc le fait que les courants de Foucault ont une répartition tridimensionnelle dans les aimants. Afin de valider le modèle développé, une maquette expérimentale a été mise en place. Dans un premier temps, le modèle de calcul des pertes par courants induits dans les pièces massives a été validé en utilisant une approche qui combine les résultats expérimentaux et ceux calculés analytiquement et numériquement. Ensuite différentes grandeurs globales et locales issues du modèle analytique ont été comparées aux éléments finis aussi bien en 2D qu'en 3D de même qu'aux mesures expérimentales. Les modèles et méthodes de calcul et de mesures proposés pourront être efficacement utilisés ultérieurement pour estimer les pertes par courants induits dans les aimants permanents de moteurs synchrone à aimantsThe work presented in this thesis is part of various research programs on the modeling and design of permanent magnet synchronous machines for land transport applications. Indeed, the current trend, whether in railway traction, or in electric and / or hybrid electric vehicles, is to use such engines for their high mass performance and good efficiency. This trend is also observable in large direct-attack wind turbines. However, one disadvantage of these machines is the existence of significant losses in the permanent magnets. These losses can cause a deterioration in efficiency, and also be the cause of excessive heating of the magnets, with risks of demagnetization and risks of. In this context, the aim of our thesis work was to establish new, more accurate models of eddy current losses in magnets. The models currently used are generally two-dimensional models which therefore ignore the three-dimensional distribution of eddy currents in the magnets. In order to validate the model developed, we set up an experimental test bench. In a first step, the calculation of induced current losses in massive pieces was validated using an approach that combines the experimental results with those calculated analytically and numerically. Then, different global and local quantities from the analytical model were compared to the finite elements in both 2D and 3D as well as experimental measurements. The models and methods of computation and measurements proposed can be effectively used later to estimate eddy current losses in the permanent magnets of synchronous magnet motors
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Blaha, Jan. "Návrh a analýza synchronních strojů s permanentními magnety." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221070.
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Characteristics of synchronous machines with permanent magnets depend among others on geometric layout of the machine section. Unlike EC motors, where rectangular arrangement of quantities is suitable, these machines require sinusoidal behaviour. Specific forming of individual machine parts is partially derived from this requirement. This thesis deals with design of such machines, including various geometrical modifications of their sections and examination of influence of those modifications. The thesis includes also analytical calculation procedure of machine parameters as well as verification of final characteristics using the finite element method. It results in a combination of various design methods. FEMM, Maxwell RMxprt and Maxwell 2D Transient Analysis programs were used for verification. Individual modifications of machine geometries are applied to machines with concentrated windings with different ratio of number of slots and poles, and differences between machines and results of individual methods are compared.
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Prieto, Rodriguez Dany. "Modélisation et optimisation des machines synchro-réluctantes à aimants permanents et de leur électronique." Thesis, CentraleSupélec, 2015. http://www.theses.fr/2015SUPL0013/document.
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Cette thèse s’intéresse à l’étude d’une structure de moteur électrique à aimants permanents afin de réduire l’utilisation d’aimants à basse de terres rares et qui puisse être utilisée pour des applications industrielles. Il est montré dans la première partie de ce travail de recherche que la machine synchro-réluctante à aimants permanents est une bonne solution potentielle. Une analyse paramétrique est alors réalisée en utilisant une modélisation par éléments finis pour mettre en évidence les particularités de son comportement électromagnétique. Puis, une modélisation analytique multi-physique innovante du système convertisseur-moteur est détaillée dans le but de calculer les performances de ce dernier en un temps raisonnable. Les modèles multi-physiques présentés dans ces travaux concernent l’onduleur et le moteur. Ils intègrent les aspects électromagnétique, électrique, énergétique, thermique, mécanique et technico-économique. Le modèle multi-physique de la machine électrique est validé par comparaison à des résultats d’essais sur un prototype. Le modèle du système qui a été développé est ensuite utilisé dans une procédure de conception par optimisation de systèmes d’entrainements. Pour cela, une démarche d’optimisation originale est présentée pour le dimensionnement conjoint de deux applications en imposant la contrainte d’utiliser la même tôlerie magnétique. Il s’agit d’une part d’une application à vitesse fixe et d’autre part d’une application de type traction électrique. La méthode d’optimisation employée est à évolution différentielle. Les résultats des optimisations réalisées permettent de déterminer des conceptions optimales ou des compromis optimaux aux sens de Pareto qui répondent aux deux applications visées. Finalement, cette thèse a permis de positionner la machine synchro-réluctante à aimants permanents parmi les structures de machines à fort potentiel industrielThis thesis focuses on the study of a structure of permanent magnet electric motor which reduces the amount used of permanent magnets composed of rare earths and which can be used in industrial applications. In the first part of the research work, it is shown that the permanent magnet assisted synchronous reluctance machine is a good alternative. A parametric analyse is realised using a finite element modelling in order to highlight the peculiarities of its electromagnetic behaviour. Then, an innovative multi-physic analytical modelling for the system inverter-motor is detailed in order to evaluate its performances in a reasonable computational time. The multi-physic models presented in this work concern the inverter and motor. They integrate the electromagnetic, electric, energetic, thermal, mechanic, and techno-economic aspects. The multi-physical model of the electric machine is validated by means of tests carried out on a prototype. The model of the system which has been developed is used in a design procedure by optimization of drive systems. For this purpose, an original optimization approach is presented for the simultaneous design of two applications by imposing the constraint of using the same magnetic lamination. On one hand it is an application of fixed speed and on the other hand an application of electric traction. The optimization method used is a type of differential evolution optimization. The results of the optimizations realised determine the optimal designs or the optimal compromise with Pareto front which deal with both applications. Finally, this thesis has placed the permanent magnet assisted synchronous reluctance machine among structures of machines with great industrial potential
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Elhangari, Abdelbaset K. Tahir. "Sliding-Mode Control of the Permanent Magnet Synchronous Motor (PMSM)." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1386173503.
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Sivaraman, Gokul. "Development of PMSM and drivetrain models in MATLAB/Simulink for Model Based Design." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301027.
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When developing three-phase drives for Electric Vehicles (EVs), it is essential to verify the controller design. This will help in understanding how fast and accurately the torque of the motor can be controlled. In order to do this, it is always better to test the controller using the software version of the motor or vehicle drivetrain than using actual hardware as it could lead to component damage when replicating extreme physical behavior. In this thesis, plant modelling of Permanent Magnet Synchronous Machine (PMSM) and vehicle drivetrain in MATLAB/Simulink for Model Based Design (MBD) is presented. MBD is an effective method for controller design that, if adopted can lead to cost savings of 25%-30% and time savings of 35%-40% (according to a global study by Altran Technologies, the chair of software and systems engineering and the chair of Information Management of the University of Technology in Munich) [1]. The PMSM plant models take effects like magnetic saturation, cross- coupling, spatial harmonics and temperature into account. Two PMSM models in d-q frame based on flux and inductance principles were implemented. Flux, torque maps from Finite Element Analysis (FEA) and apparent inductance from datasheets were used as inputs to the flux- and inductance-based models, respectively. The FEA of PMSM was done using COMSOL Multiphysics. The PMSM model results were compared with corresponding FEA simulated results for verification. A comparison of these PMSM models with conventional low fidelity models has also been done to highlight the impact of inclusion of temperature and spatial harmonics. These motor models can be combined with an inverter plant model and a controller can be developed for the complete model. Low frequency oscillations of drivetrain in EVs lead to vibrations which can cause discomfort and torsional stresses. In order to control these oscillations, an active oscillation damping controller can be implemented. For implementation of this control, a three-mass mechanical plant model of drivetrain with an ABS (Anti-lock Braking System) wheel speed sensor has been developed in this thesis. Analysis of the model transfer function to obtain the pole zero maps was performed. This was used to observe and verify presence of low frequency oscillations in the drivetrain. In order to include the effects of ABS wheel speed sensor and CAN communication, a model was developed for the sensor.Testning av regulatorernas inställningar med hänsyn till snabbhet och noggrannhet i momentreglering är avgörande i trefasiga drivsystem för elektriska fordon. Oftast är det bättre att simulera i stället för att utföra experimentella tester där komponenter kan skadas på grund av fysisk stress. Detta kallas för Model Based Design (MBD). MBD är an effektiv metod för utformningen av styrningen som kan leda till kostnadsbesparingar på 25%-30% och tidsbesparingar på 35%-40% enligt en studie från Altran Technologies i samarbete med Tekniska universitet i München, TUM. Detta examensarbete behandlar en modell för en synkronmaskin med permanentmagneter (PMSM) samt en modell för drivlinan utvecklad i Matlab/Simulink för MBD. PMSMs modellen inkluderar magnetisk mättnad och tvärkoppling, MMF övervågor och temperatur. Två PMSM modeller har utvecklats. Den första baseras på magnetiskt flöde som erhålls från finita element beräkningar i COMSOL Multiphysics medan den andra bygger på induktanser givna från datablad. En jämförelse av dessa PMSM-modeller med konventionella low fidelity-modeller har också gjorts för att illustrera påverkan temperaturberoende och MMF övervågor. Modellerna kan kombineras med en växelriktarmodell för att utveckla en hel styrenhet. Lågfrekventa oscillationer i drivlinan leder till vibrationer som kan orsaka vridspänningar och försämra komforten i elfordonet. En aktiv dämpningsregulator kan implementeras för att kontrollera spänningarna men en mekanisk drivlinemodell med tre massor och en ABS (anti-lock braking system) hastighetssensor behövs. Den mekaniska modellen har implementerats och analyserats även beaktande en modell för en CAN kommunikationskanal. Oscillationer med låg frekvens kunde observeras i modellen.
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Shah, Dhruv. "Sensorless control of permanent magnet synchronous motor." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112040.
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Nous proposons dans ces travaux, une solution aux problèmes de longue date posés par le control sans capteur d’une machine électrique. Cette solution consiste à élaborer un contrôleur asymptotiquement stable qui régule la vitesse du moteur en mesurant uniquement les coordonnées électriques. Nous l’avons appliqué à un moteur synchrone à aimant permanent non saillant, perturbé par un couple de charge constant non connu. Le schéma proposé est un observateur non linéaire d’ordre 4, basé sur le control qui ne dépend pas d’opérations non robustes intrinsèques au système, comme l’intégration de boucle ouverte à un système dynamique et ce schéma peut être facilement intégrée en temps réel. Le contrôleur est facile à commander par l’ajustement du gain qui détermine directement le taux de convergence de la position et de la vitesse et charge le couple d’observateurs. Les simulations et les résultats expérimentaux mettent en évidences les bonnes performances ainsi que la robustesse des paramètres d’incertitudes du schéma que nous proposons. La comparaison par simulation avec un contrôleur sans capteur à champ orienté présenté récemment dans la littérature, a également été effectuée. La thèse se termine par des remarques de conclusion et des propositions de sujet de recherche s’inscrivant dans la continuité de ces travauxA solution to the longstanding problem of sensorless control of an electrical machine is provided in this work. That is, the construction of an asymptotically stable controller that regulates the mechanical speed of the motor, measuring only the electrical coordinates. The result is presented for a non-salient permanent magnet synchronous motor perturbed by an unknown constant load torque. The proposed scheme is a fourth order nonlinear observer-based controller that does not rely on-intrinsically nonrobust-operations like open-loop integration of the systems dynamical model nor signal differentiation, and can be easily implemented in real time. The controller is easy to commission, with the tuning gains directly determining the convergence rates of the position, speed and load torque observers. Simulation and experimental results that illustrate the good performance, as well as the robustness to parameter uncertainty, of the scheme are presented. A simulated comparison with a sensorless field-oriented controller, recently proposed in the drives literature, is also carried out. The thesis is closed with some concluding remarks and some potential research topics generated from this work
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Monajemy, Ramin. "Control Strategies and Parameter Compensation for Permanent Magnet Synchronous Motor Drives." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/11247.
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Variable speed motor drives are being rapidly deployed for a vast range of applications in order to increase efficiency and to allow for a higher level of control over the system. One of the important areas within the field of variable speed motor drives is the system's operational boundary. Presently, the operational boundaries of variable speed motor drives are set based on the operational boundaries of single speed motors, i.e. by limiting current and power to rated values. This results in under-utilization of the system, and places the motor at risk of excessive power losses. The constant power loss (CPL) concept is introduced in this dissertation as the correct basis for setting and analyzing the operational boundary of variable speed motor drives. The control and dynamics of the permanent magnet synchronous motor (PMSM) drive operating with CPL are proposed and analyzed. An innovative implementation scheme of the proposed method is developed. It is shown that application of the CPL control system to existing systems results in faster dynamics and higher utilization of the system. The performance of a motor drive with different control strategies is analyzed and compared based on the CPL concept. Such knowledge allows for choosing the control strategy that optimizes a motor drive for a particular application. Derivations for maximum speed, maximum current requirements, maximum torque and other performance indices, are presented based on the CPL concept. High performance drives require linearity in torque control for the full range of operating speed. An analysis of concurrent flux weakening and linear torque control for PMSM is presented, and implementation strategies are developed for this purpose. Implementation strategies that compensate for the variation of machine parameters are also introduced. A new normalization technique is introduced that significantly simplifies the analysis and simulation of a PMSM drive's performance. The concepts presented in this dissertation can be applied to all other types of machines used in high performance applications. Experimental work in support of the key claims of this dissertation is provided.Ph. D.
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Abou, Qamar Nezar Yehya. "SUPPRESSION OF HARMONIC TORQUE AND HARMONIC CURRENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1522.
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In this dissertation harmonic current, harmonic torque originated at the load and harmonic torque originated at the motor, where modeled and treated via closed loop control. The dissertation propose a remedy for cancelling harmonic current by placing the proposed adaptive feedforward controller (AFC) in parallel with the FOC current control. Similarly, harmonic torque load was cancelled by proposing an AFC in parallel with the speed control loop. Harmonic torque originated in the motor mainly due to harmonic flux where cancelled through the estimation of harmonic flux, which was achieved by a novel Minimal Parameter Harmonic Flux Estimator (MPHFE). The latter is formulated such that the inductance, resistance, and stator current and its derivative are not necessary for the estimation of the harmonic eflux. This was achieved by forcing the harmonic current induced by the harmonic flux component to zero through the combined action of a Field-Oriented Controller (FOC) and a feed-forward controller. Subsequently, the harmonic flux can be obtained directly from the estimated harmonic back-EMF without the involvement of other motor parameters. Finally, the estimated flux is used in conjunction with a comprehensive analysis of the motor harmonic torque to determine the stator current compensation to eliminate the torque harmonic. A systematic approach to assign the parameter of the AFC controller were developed in this dissertation. Furthermore, multiple experiments were conducted to demonstrate the efficacy of the proposed control schemes harmonics.
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Feilberg, Espen. "Investigation of the Doubly Fed Permanent Magnet Synchronous Machine." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9962.
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This master thesis treats the research of a novel generator with converter design called Doubly Fed Permanent Magnet Synchronous Machine, DF-PMSM, patented by SmartMotor. The thesis includes an introduction to the machine, a state-of-the-art survey, a hydro power case, simulations and a laboratory experiment. The DF-PMSM concept adds an important feature to fixed speed PMSM systems; the reactive power can be regulated. Compared to a direct coupled PMSM the DF-PMSM concept can add voltage control (by controlling the reactive power) in addition to active power control. The concept is based on a 6-phase Permanent Magnet Synchronous Machine where the windings are grouped into two sets of 3-phase, both situated in the stator. These winding sets are named control and power winding, named after their purpose in the design. The control winding is routed through a converter with active-front-end rectifier. It will be used to control the reactive power and the active power from the control winding. The power winding will carry most of the generated power, directly coupled and in sync with the voltages of the connected grid. The state-of-the-art survey includes constant speed and variable speed generators utilized in hydro power generation today. It also includes some general info about doubly fed and multiphase machines. The grid regulations for Norway are also investigated to give a pointer to what requirements that the DF-PMSM needs to fulfill to be connected to the grid. The machine simulations are done in LTspice where machine simulation models are developed for this purpose. Simulation of machine startup and changes is load is done. The simulation models are developed as hierarchical sub blocks that can be re used in later simulation cases. The laboratory is done with two machines in back-to-back configuration with industry standard converters. The DF-PMSM is made from a 3-phase permanent magnet machine that is rewired to a 6-phase configuration. The laboratory exercise includes start up, synchronization of the power winding to the grid, machine loading and reactive power compensation by the active front end converter. The DF-PMSM is confirmed working and design considerations are given based experience gained from working with this design. All of this information is included in this report and the further work needed before this machine is constructed and sold is sketched in the conclusion.
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Dever, Timothy P. "Direct Torque Control of Resonant Inverter Driven Permanent Magnet Synchronous Motor." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586426523199448.
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Li, Yaohua [Verfasser]. "Direct Torque Control of Permanent Magnet Synchronous Machine / Yaohua Li." Aachen : Shaker, 2010. http://d-nb.info/1081886862/34.
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Al-Taee, Majid Abdulwahid. "A synchronous ultrasonically modulated drive system incorporating a permanent magnet machine." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314513.
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Almarhoon, Ali. "Sensorless control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15888/.
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Lovelace, Edward Carl Francis. "Optimization of a magnetically saturable interior permanent-magnet synchronous machine drive." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9085.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (p. 258-263).
Interior permanent magnet (IPM) synchronous machines are attractive because they can achieve constant-power operation over a wide speed range with limited magnet strength requirements and reduced power electronics cost. These characteristics provide the IPM machine with advantages over alternative machine types in applications such as spindle and traction drives. An important challenge for high-performance IPM machine design is to model the magnetic saturation of the core in a manner that is accurate, flexible, and computationally fast for design optimization. A magnetically-saturable lumped parameter model (LPM) is developed for the optimized design of high-performance IPM synchronous machine drives. Using equivalent magnetic circuit analyses, the dq-frame inductances and magnet flux linkage are calculated for transversely-laminated IPM machines. The lumped parameters are employed to predict machine drive system performance for both rated-torque and constant-power operation. The results of saturable model calculations and finite element analysis (FEA) match very closely for the machine inductances, magnet flux linkage, and converted torque. Further validation is presented by comparing measurements of existing experimental machines to predictions from the saturable lumped parameter model. Agreement of measurements and predictions for the highly nonlinear saturable q-axis inductance is within 5% in the saturated excitation range. The utility of the saturable LPM is then demonstrated by developing a cost-optimized design for an automotive integrated starter/generator (ISG) that is rated at 4 to 6 kW during generating operation. This ISG machine is mounted in a direct-drive mechanical configuration on the engine crankshaft. Agreement between the saturable LPM and FEA calculations for q- and d- axis inductances and PM flux linkage are all within 5% for the entire excitation range. Results of this model have been combined with structural FEA and demagnetization studies to produce a machine design that is predicted to meet all key ISG performance requirements. For this application and the chosen cost model, it is shown that optimizing the combined machine and drive system versus optimizing only the machine reduces the overall cost prediction by 12%.
by Edward Carl Francis Lovelace.
Ph.D.
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Cuenot, Jérémy. "Architectures d'alimentation et de commande des actionneurs haute-vitesse connectés aux réseaux avioniques à tension variable." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0263/document.
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La révolution technologique majeure des nouveaux aéronefs repose sur une électrification intensive de nombreux constituants de l'appareil et le fait que la vitesse des génératrices électriques n'est plus fixe mais variable. Cette nouvelle manière de générer la puissance électrique engendre des variations de tension sur les réseaux DC. De plus, pour accroître la compacité des Machines Synchrones à Aimants Permanents (MSAP) à puissance donnée, on augmente autant que possible leur vitesse d'entrainement, en les associant pour certaines applications à des réducteurs mécaniques. La variation du niveau de tension du bus DC alimentant une MSAP haute vitesse implique son dimensionnement afin d'assurer sa contrôlabilité sur toute la plage de vitesse reportant d'importantes contraintes sur l'onduleur de tension. Pour pallier ce problème, une solution consiste à intercaler un convertisseur DC/DC entre le filtre d'entrée et l'onduleur de tension pour maintenir la tension DC d'entrée de l'onduleur à une valeur adaptée au fonctionnement de la MSAP et optimiser son dimensionnement. Cependant, cette solution augmente l'ordre du système, ce qui accroît la complexité de son contrôle, accentuée par les contraintes liées à la nature haute-fréquence des MSAP considérées.Les travaux menés dans cette thèse concernent l'étude, l'optimisation et le contrôle des structures d'alimentation des actionneurs haute vitesse connectés aux réseaux DC avioniques à tension variable. Il en résulte que pour les applications avioniques considérées, ces architectures d'alimentation intégrant un convertisseur DC/DC supplémentaire permettent de réduire sa masse et son volume sans dégrader le rendement global de la chaîne de conversion notamment avec les convertisseurs à source impédante qui permettent de supprimer structurellement les ondulations de courant en entrée du convertisseur. De plus, des stratégies de commande Pulse Amplitude Modulation employées avec des architectures de contrôle non-linéaires (platitude, passivité) permettent d'assurer le contrôle de ces MSAP haute-vitesse tout en assurant leur stabilité sur toute la plage de fonctionnementThe main technological revolution of the new aircrafts is based on intensive electrification of many components of the aircraft. Moreover, the speed of electrical generators is no longer fixed but variable. This new way of generating electrical power generates voltage variations on DC networks. Besides, to increase the compactness of the Permanent Magnet Synchronous Machines (PMSM) at a given power, their mechanical speed is increased as much as possible by combining them with mechanical reducers for certain applications. The variation of the voltage level of the DC bus supplying a high-speed PMSM implies its sizing in order to ensure its controllability over the entire speed range which carries significant stresses on the Voltage Source Inverter (VSI). To solve this problem, one solution consists in adding an extra DC / DC converter between the input filter and the VSI to maintain the inverter input voltage at a value adapted to the operating point of the PMSM and to optimize its dimensioning. However, this solution increases the order of the system, which increases the complexity of its control, accentuated by the constraints related to the high-frequency nature of the PMSMs considered. The work carried out in this thesis concerns the study, the optimization and the control of the power supply architecture of the high-speed actuators connected to variable-voltage avionic DC networks. As a result, for the avionics applications considered, these power supply architectures integrating an additional DC / DC converter make it possible to reduce the mass and the volume of the power supply structure without degrading the overall efficiency of the conversion chain, in particular by using the impedance-source converters which allow to cancel the DC input current ripples. In addition, Pulse Amplitude Modulation (PAM) control strategies used with non-linear control architectures (flatness, passivity) make it possible to control these high-speed PMSMs while ensuring their stability over the entire operating range
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Ren, Yuan. "Direct torque control of dual three-phase permanent magnet synchronous machine drives." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12190/.
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Malloy, Adam. "Thermal management of the permanent magnets in a totally enclosed axial flux permanent magnet synchronous machine." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25094.
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Elevated magnet temperature in Axial Flux Permanent Magnet Synchronous Machines (AF PMSM) adversely affects torque production, material cost, and the risk of demagnetisation. These machines show promise in applications requiring high power density, however the factors which affect magnet temperature have rarely been investigated. This is therefore the focus of the thesis. A multiphysics numerical model was formulated which predicted the loss, flow, and temperature fields within an AF PMSM. A criterion for estimating the relative importance of the fluctuating component of a periodic heat source on the temperature response of a device was proposed and validated. In this work it was used to justify a steady state, rather than transient, thermal analysis. Thermometric and electrical measurements were taken from an instrumented AF PMSM to validate the numerical predictions. A novel magnet loss measurement technique was implemented; losses were determined by measuring the initial temperature rise rate of the magnets. This was achieved via a calibration relating temperature rise to voltage constant. It was found that 99% of the heat generated in the magnets was convected to the inner cavity of the machine, due to the inner cavity's recirculating flow structure this heat was dissipated to the casing and core. As a proportion of all heat entering the inner cavity 56-62% left to the casing while 28-41% left to the core. Magnet hot spots were found to be up to 13% greater than the mean temperature rise. Their location was influenced by the distribution of losses and the direction of shaft rotation. Temperature gradients within the inner cavity caused the magnet's trailing edge to incur a 10% greater temperature rise than the leading edge. As increasing temperature decreases the coercivity of magnet materials these findings are a crucial contribution to the understanding of devices where local demagnetisation is of concern.
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Underwood, Samuel J. "ON-LINE PARAMETER ESTIMATION AND ADAPTIVE CONTROL OF PERMANENT MAGNET SYNCHRONOUS MACHINES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1143656836.
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Wang, Yuanlin [Verfasser]. "Contributions to optimize the control of Permanent Magnet Synchronous Machine Drives / Yuanlin Wang." Aachen : Shaker, 2017. http://d-nb.info/1138177164/34.
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Grobler, Andries Johannes. "Thermal modelling of a high speed permanent magnet synchronous machine / Andries J. Grobler." Thesis, North-West University, 2011. http://hdl.handle.net/10394/6528.
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Thermal modelling is of great importance in all electric machines but especially in permanent
magnet synchronous machines (PMSMs). The thermally fragile permanent magnets (PMs) can
more easily be demagnetized at high temperatures. When high speed machines are considered,
heat extraction surfaces are small due to the higher energy density. This thesis focuses on the
thermal modelling of a high speed slotless PMSM using analytical techniques. From literature
it is clear that analytical distributed models have not reached its full potential in thermal modelling
of electric machines. Thermal experiments on high speed electric machine, including
rotor PM temperature measurements are not commonly found in literature.
The thermal behaviour of each component of the machine is influenced by the overall temperature
distribution. The widely used lumped parameter (LP) cylindrical component model
derived by Mellor et al. is used to derive a LP model of the entire machine. A two dimensional
(2-D) analytical distributed model is derived for the rotor PM using the separation of variables
method. Three of the boundaries are assumed to be of the convection type and the fourth of
constant heat flow type. Different convection coefficients are assumed to exist in the radial and
axial directions. The distributed model is verified using COMSOL
R and good correlation is
shown. The distributed model is used to determine the temperature distribution in the PM
and the convection heat flow in the axial direction.
Loss calculation is an integral part of thermal modelling. Temperature changes in an electric
machine is due to the interaction between the heat generation (losses) and heat removal. The
losses found in a high speed slotless PMSM are investigated. A 2-D analytical magnetic model
is used to determine the stator lamination loss as well as the stator winding eddy current loss. A
simple LP model is derived for the rotor eddy current loss. Due to the relatively large resistivity
of the shielding cylinder and PM material, the rotor eddy current loss is a significant part of the
total machine loss. The tangential current width is determined empirically in this thesis but a
3-D distributed model which includes end space effects and skin depth could also be used.
A large part of thermal modelling is empirically based. The convection and interface resistances
are determined through a set of experiments in this thesis. The measured and calculated
convection coefficients correlated well for both forced and natural convection cooling. A large
temperature increase found during the no-load test can be attributed to large bearing loss, possibly
due to axial loading. The LP model is modified to include the phenomena found during
the experiments.
The thermal model is used to predict the temperatures of a high speed PMSM at rated load and speed. Although the PM is not heated above the Curie temperature, demagnetization is
still possible. According to the model, the machine will not be able to operate at full load and
speed for extensive periods due to mechanical stress limits being exceeded. The temperature
distribution of the PM could not be verified since the temperatures in the air gap and end space
could not be measured. It is expected that axial heat flow will be larger than what is currently
predicted by the distributed model. A sensitivity analysis was used to investigate the influence
of the thermal resistances and losses on the machine temperatures. Methods for reducing the
rotor eddy current loss and interface resistances are also discussed.
The first contribution of this thesis is the 2-D analytical distributed model for the PM of a high
speed PMSM. Hot spots and 2-D heat flow can be analysed using this model. Combining the
LP and 2-D analytical distributed models is another contribution. This combines the simplicity
and fast solution times of the LP model with the 2-D thermal distribution of the analytical
distributed model. The systematic experimental investigation of the thermal behaviour of a
high speed PMSM is a further contribution.Thesis (Ph.D. (Electrical Engineering))--North-West University, Potchefstroom Campus, 2011.
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Zhan, Hanlin. "Open winding permanent magnet synchronous machine drives with particular reference to zero sequence." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18230/.
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Wang, Bo. "A triple redundant 3x3-phase fault tolerant permanent magnet synchronous reluctance machine drive." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19803/.
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Fault tolerant machine drives are key enabling technologies for safety critical applications such as electric vehicle traction, and aerospace power generation, actuation and propulsion. High performance in healthy conditions and excellent fault tolerance against various faults are required for a fault tolerant drive, however, these two aspects usually conflict with each other. Thus, this PhD study aims to develop a fault tolerant machine drive which exhibits high performance and good fault tolerance, and can be realised in a simple and cost-effective manner. First, a novel triple redundant 3x3-phase permanent magnet assisted synchronous reluctance machine (PMA SynRM) with segregated windings is proposed. Its performance under healthy conditions and its ability to tolerate various faults with appropriate mitigation measures are investigated and assessed. Based on outcomes of the investigation, a 40kW machine is designed to tolerate all key electrical faults, including the worst single turn short circuit, and is optimised to maximise the efficiency in healthy conditions whilst satisfying the electrical, thermal and mechanical constraints. To analyse and realise a fault tolerant machine drive, fault modelling and fault detection techniques are essential. Thus, a general model is proposed based on the magneto-motive force (MMF) decomposition. The model is capable of predicting the machine behaviour in various operation modes, including the healthy condition, open circuit, short circuit and inter-turn short circuit fault with different number of turns and different coil locations. With the aid of the fault modelling technique, a turn fault detection technique is developed using the 2nd harmonics in the instantaneous reactive and active powers as fault indicators for motoring and generating modes, respectively. By cross-reference of the fault indicators of the three 3-phase sets, the technique can detect the turn fault during transient without false alarm. The optimised machine drive is constructed and the developed fault detection technique together with fault mitigation strategies is implemented in a DSP based controller. The performance of the drive under healthy conditions and its fault tolerant capability are validated by extensive tests. The accuracy of the fault modelling and the effectiveness of the detection technique are also experimentally evaluated. The test results demonstrate that the developed fault tolerant machine drive can be a competitive candidate for safety critical applications.
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Zhang, Yuan. "Sensorless Vector Control and Field Weakening Operation of Permanent Magnet Synchronous Machines." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704.
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Khan, Kashif Saeed. "Design of a Permanent-Magnet Assisted Synchronous Reluctance Machine for a Plug-In Hybrid Electric Vehicle." Licentiate thesis, KTH, Elektrisk energiomvandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50595.
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Ichikawa, Shinji, Mutuwo Tomita, Shinji Doki, and Shigeru Okuma. "Sensorless Control of Permanent-Magnet Synchronous Motors Using Online Parameter Identification Based on System Identification Theory." IEEE, 2006. http://hdl.handle.net/2237/9622.
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Garate, Inaki. "Entirely digital permanent magnet synchronous machine controller by a single digital signal processor chip." Thesis, Staffordshire University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237841.
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Alsawalhi, Jamal Yousuf. "An asymmetric salient permanent magnet synchronous machine for wide constant power speed range applications." Thesis, Purdue University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3686817.
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This work introduces a novel permanent-magnet synchronous machine (PMSM) architecture that employs rotational asymmetry to increase the torque density output in constant power variable speed applications. A population based multi-objective design optimization algorithm is used to design and analyze the new machine topology. A number of design studies are presented to show that the proposed machine structure outperforms a conventional PMSM machine. Validation of the analytical machine design model using a three dimensional finite element analyses is performed and the results are presented. Finally, a case study in which a hybrid electric bus traction motor is designed is presented.
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De, Kock Hugo Werner. "Dynamic control of the permanent magnet assisted reluctance synchronous machine with constant current angle." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2062.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.This thesis is about the dynamic control of a permanent magnet assisted reluctance synchronous machine (PMA RSM). The PMA RSM in this thesis is a 110 kW traction machine and is ideal for the use in electrical rail vehicles. An application of the dynamic control of the PMA RSM in electrical rail vehicles is to reduce wheel slip. The mathematical model of the PMA RSM is derived and explained in physical terms. Two methods of current control for the PMA RSM are investigated, namely constant field current control (CFCC) and constant current angle control (CCAC). It is shown that CCAC is more appropriate for the PMA RSM. A current controller for the PMA RSM that guarantees stability is derived and given as an analytic formula. This current controller can be used for any method of current control, i.e. CFCC or CCAC. An accurate simulation model for the PMA RSM is obtained using results from finite element analysis (FEA). The accurate model is used in a simulation to verify CCAC. A normal proportional integral speed controller for the PMA RSM is designed and the design is also verified by simulation. Practical implementation of the current and speed controllers is considered along with a general description of the entire drive system. The operation of the resolver (for position measurement) is given in detail. Important safety measures and the design of the electronic circuitry to give protection are shown. Practical results concerning current and speed control are then shown. To improve the dynamic performance of the PMA RSM, a load torque observer with compensation current feedback is investigated. Two observer structures are considered, namely the reduced state observer and the full state observer. The derivation of the full state observer and the detail designs of the observer elements are given. The accurate simulation model of the PMA RSM is used to verify the operation of the observer structures and to evaluate the dynamic performance. Both observer structures are implemented practically and practical results are shown. One method of position sensorless control, namely the high frequency voltage injection method, is discussed in terms of the PMA RSM. This work is additional to the thesis but it is shown, because it raises some interesting questions regarding the dynamic control of the PMA RSM.
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Prins, Michiel Hendrik Albertus. "Design of a field-intensified interior permanent magnet synchronous machine for electric vehicle application." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86242.
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Thesis (MScEng)--Stellenbosch University, 2014.ENGLISH ABSTRACT: The focus of this thesis is on the optimal design and evaluation of FI-PM machines to be used with a MG transmission drive-train for EV application. The machines presented are optimised using a gradient-based optimisation algorithm of the VisualDoc software together with FE software and Python scripts. Each machine is optimised for its own objective function. The focus is to reduce expensive rare earth material. High torque ripple issues of the optimised machines are solved by implementing a relatively new topology where the rotor poles/barriers are made asymmetric. The asymmetric rotor topology implemented is effective and can be used as an alternative for rotor stack skewing. PM demagnetisation and rotor deformation studies are conducted on the optimum designed machines to ensure that no PM demagnetisation on the surface of the PMs and critical rotor deformation occur. The FE performance results of the optimum designed machines are shown and discussed. One of the optimum designed FI-PM machines is manufactured and tested in the laboratory. The FE and measured results of the machine are compared and shows good correlation. The saliency performance of the optimum designed machines are evaluated as it determines its position sensorless control capability. It is shown that the saliency ratios increase linearly with load, making it favourable for position sensorless control. It is also shown that the asymmetric rotor topologies introduced a larger mutual inductance compared to their symmetric counterparts, thus higher cross-coupling is present in these rotors and therefore a higher saliency shift, which is undesirable. Two case studies are performed in order to improve saliency performance. The objective of the first case study is to improve the saliency shift by reducing the flux leakage paths in the rotor. The objective of the second case study is to optimise a FI-PM machine in order to improve the saliency ratio and -shift. The results of the two case studies are compared with the saliency performance of the other machines.
AFRIKAANSE OPSOMMING: Die fokus van hierdie tesis is op die optimale ontwerp en evaluering van veld versterking permanente magneet masjiene vir veelvoudige-rat elektriese voertuig toepassings. Die masjiene teenwoordig is geoptimeer met behulp van ’n helling-gebaseerde optimering algoritme. Elke masjien is geoptimeer vir sy eie doel funksie. Die fokus is om duur seldsame permanent magneet materiaal te verminder. Hoë wringkrag-rimpeleffek van die optimale masjiene word opgelos deur die implementering van ’n relatief nuwe topologie waar die rotor pole/vloedbarrière asimmetries gemaak word. Die asimmetriese rotor topologie wat geimplementeer is, is effektief en kan dus as ’n alternatief vir die rotor stapel skeef metode gebruik word. Permanent magneet demagnetisering en rotor vervorming studies is ook uitgevoer op die optimum ontwerpte masjiene om te verseker dat geen demagnetisering plaasvind nie en ook geen kritiese rotor vervorming nie. Die eindige-element resultate van die optimum ontwerpte masjiene word getoon en bespreek. Een van die optimum ontwerpte veld versterking permanente magneet masjiene is vervaardig en getoets in die laboratorium . Die eindige-element en gemete resultate van die masjien word vergelyk en toon goeie korrelasie. Die speek prestasie van die optimum ontwerpte masjiene word geëvalueer aangesien dit die sensorlose posisie beheer vermoë bepaal. Daar word getoon dat die speek koëffisiënt verhoog lineêr met vrag wat dit gunstig maak vir posisie sensorlose beheer . Daar word ook gewys dat die asimmetriese rotor topologie ’n groter wedersydse induktansie het in vergelyking met hul simmetriese eweknieë, dus is daar hoër kruis-koppeling teenwoordig in die rotors en dus ’n ho¨er speek skuif, wat ongewens is. Twee gevallestudies om speek prestasie te verbeter is uitgevoer. Die doel van die eerste gevallestudie is om die speek skuif te verbeter deur die vermindering van die vloed lekkasie paaie in die rotor. Die doel van die tweede gevallestudie is om ’n veld versterking permanente magneet masjiene te optimeer ten einde die speek koëffisiënt en - skuif te verbeter. Die resultate van die twee gevallestudies word vergelyk met die speek prestasie van die ander masjiene.
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Yuan, Yi. "Torque ripple reduction in a permanent magnet synchronous machine using repetitive control techniques (Drift)." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=d81a622d-ce54-4be1-8bed-491ba10fa201.
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Les machines synchrones à aimants permanents (MSAP) sont de plus en plus utilisées dans de nombreuses applications grâce à leur efficacité, fiabilité et performances. Cependant, les oscillations de couple peuvent provoquer des oscillations de la vitesse qui sont considérées comme un problème majeur dans certaines applications à faible vitesse. Par conséquent, la commande répétitive (CR) est choisie pour sa forte capacité à réduire ces perturbations périodiques et réduire les oscillations de couple. Il existe deux problèmes principaux lors de l’application de la CR à une MSAP. D’abord, la CR ne peut réaliser la réduction souhaitée que dans le cas d’une vitesse constante. Grâce à la relation fixe entre ces oscillations et la position du rotor, nous proposons de prendre l’angle mécanique comme la nouvelle variable du fonctionnement de la CR. Ce nouveau régulateur est appelé régulateur répétitif basé sur la position angulaire. L’avantage de ce contrôleur est sa capacité de réduction même dans le cas d’une vitesse variable. Le deuxième inconvénient de l’application de la CR est sa difficulté d’implantation dans les systèmes industriels. Ainsi, nous proposons d’ajouter le contrôleur répétitif dans un capteur de vitesse et de développer une nouvelle technique appelée capteur répétitif intelligent. Avec ce capteur, l’application de la technique de CR ne requiert aucune modification du contrôleur, mais il est nécessaire de remplacer le capteur normal par le capteur répétitif intelligent. Finalement, ces deux nouvelles techniques sont réalisées ensemble sur un banc d’essais et leur efficacité est validée par des résultats expérimentauxPermanent magnet synchronous machines (PMSMs), due to their attractive efficiency, reliability and performance, are rapidly gaining popularity in many applications. However, torque ripples of PMSM generally cause speed ripples, which are considered as an important hindrance in some low speed applications. The repetitive control (RC), which is particularly suitable for the reduction of periodic disturbance, is chosen to achieve the torque ripple reduction, because torque ripples of PMSM can be considered as periodic disturbances. The use of the RC for machine torque ripple reduction is not new. However, the reduction is always achieved at a given speed. This is due to the nature of the RC. So as to extend the use of the RC to varying speeds, the angle-based RC technique, which takes the mechanical angle as the running variable, is considered in this work. Thanks to the fixed relationships between the torque ripples and the mechanical angle, the angle-based repetitive controller can keep its rejection capability, whether the speed is constant or not. Besides, applying the RC in a PMSM drive requires to implement a new controller, which is hardly achievable for commercial systems. In order to apply the RC for PMSM drives, this paper proposes to include the RC into a speed sensor, forming a particular speed sensor called repetitive smart sensor. Accordingly, the torque ripple reduction can simply be accomplished by changing a conventional speed sensor for a repetitive smart one. Finally, the efficiency of the proposed angle-based repetitive smart sensor is verified through experimental results
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Manakshya, Nikhil. "Permanent magnet synchronous machine using ferrite vs rare earth magnets : how do they compare?" Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302658.
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Permanent magnet synchronous machines (PMSM are considered as viable options for automotive and traction applications. Rare earth magnets such as Neodymium Iron Boron (NdFeB is the most common choice in the PMSM for electric vehicles to achieve high power density machines. However, rare earth magnets are problematic from ethical and sustainability perspectives. From these perspectives, there are better magnet alternatives, such as ferrites. Ferrite magnets are well known for lower environmental impact, abundance and low cost. Due to a lower residual flux density of a ferrite magnet than that of a rare earth magnet, a larger amount of ferrite magnets are needed to achieve the same performance. This master thesis is aimed to compare a PMSM using NdFeB magnets with a PMSM using ferrite magnets in terms of different parameters such as torque production, power factor, drive cycle efficiency, losses mapping, cost, and environmental impact. The machines are designed based on the Volvo XC40 vehicle requirements. In order to compare both the machines, ferrite based machine with different types of rotor structures such as arc and spoke type configurations are designed in Ansys Maxwell and compared with the reference PMSM holding NdFeB magnet. The demagnetisation study was performed on the ferrite magnets at lower temperature in order to investigate the feasibility of the design. In order to reduce the risk of demagnetisation, a parametric analysis of the rotor structure has been conducted. Furthermore, the mechanical integrity was investigated at top speed.Permanent magnet-synkronmaskiner (PMSM) betraktas som lönsamma alternativ för fordons och dragapplikationer. Sällsynta jordartsmagneter som Neodymiumbor (NdFeB) är det vanligaste valet i PMSM för elfordon att uppnå maskiner med hög effektdensitet. Sällsynta jordartsmagneter är emellertid problematiska ur etiska perspektiv och hållbarhetsperspektiv. Ur dessa perspektiv finns det bättre magnetalternativ, såsom ferriter. Ferrit är välkänt för lägre miljöpåverkan, överflöd och låga kostnader. På grund av låg restflödestäthet hos en ferritmagnet än en sällsynt jordartsmagnet behövs en större mängd ferritmagneter för att uppnå samma prestanda. Detta examensarbete syftar till att jämföra en PMSM med hjälp av NdFeB-magneter med en PMSM som använder ferritmagneter i termer av olika prestandaparametrar såsom vridmomentproduktion, effektfaktor, drivcykeleffektivitet, kartläggning av förluster, kostnad och miljöpåverkan. Maskinerna är designade baserat på Volvo XC40 fordons krav. För att jämföra båda maskinerna utformas ferritbaserad maskin med olika typer av rotorstruktur, såsom båg- och ekertypskonfiguration i Ansys Maxwell och jämförs med referensen PMSM som håller NdFeB-magneten. Demagnetiseringsstudien utfördes på ferritmagneterna vid lägre temperatur för att undersöka designens genomförbarhet. För att minska risken för demagnetisering har den parametriska analysen av rotorstrukturen genomförts. Dessutom undersöktes mekanisk integritet i toppfart.
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Ozturk, Salih Baris. "Direct torque control of permanent magnet synchronous motors with non-sinusoidal back-EMF." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2728.
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