This diploma thesis deals with the design of the asynchronous mathematical model, and creation its model in MATLAB Simulink. And by creating different types of asynchronous motor control. At the beginning of the work there are theoretical knowledge about transformation of quantities into coordinates, which are needed for creation of mathematical model and further for machine control. Furthermore, control logarithms are created from these transformed quantities, which can be used to control the torque or engine speed. It is a constant magnetic flux control, scalar control, vector control, and ultimately direct torque control. All derived control algorithms have been tested in MATLAB Simulink. Where were simulations of investigated quantities.

Elektrické stroje se používají v mnoha oblastech života spo¬lečnosti a vyrábí se ve velkém množství a sortimentu. Jedním z nejvíce používaných druhů jsou elektrické stroje malého výkonu na malé a nízké napětí. V širším smyslu názvem malé elektrické stroje označujeme takové stroje, které mají výkon menší než 1 kW (1000 W). Z hlediska užití můžeme rozdělit malé elektrické stroje na stroje pro obecnou potřebu a pro automatizační zařízení. Jedním z nejvíce frekventovaných druhů malých elektrických strojů jsou elektrické stroje na malé napětí, t.zn. na jmenovité napětí do 50 V.

This work deals with analysis induction motors. There are described their principle and methods of starting, the engine controls and the stop braking. In terms of this study it was determined the engine controls type for control unit for church bell electric drive design. In next part there is complete hardware and software design of control unit.

This project is focused on finite element method, for purposes of asynchronous motor modeling. Program FEMM is used here, which works with two-dimensional models. The model is based on an existing motor. Then was conducted a series of simulations that are used to calculate the parameters of the circuit model. Then was measured the existing asynchronous motor and performed the calculation of the circuit model parameters of the motor. Compared with data obtained from motor and models Then was compared their torque characteristics. Moments was identified at certain slip frequencies and voltage or current in circuit model.

The doctoral thesis is divided into two main parts.The first part deals with optimalization of the equivalent circuit parameters of induction motor for calculation steady state characteristics:- - of the equivalent circuit parameters of induction motor with normal slots. - of the equivalent circuit parameters of induction motor with deep slots. -simulation of selected chracteristics and comparison with measured values. The second part of this work deals with optimalization of the equivalent circuit parameters of induction motor for calculation of dynamic characteristics of induction motor –simulation of selected chracteristics and comparison with measured values. The optimalization is based on mutual comparison of measured and calculated torque-speed and current-speed characteristics.

Darbe įvertintos aštuonių tipų trifazių asinchroninių variklių statoriaus apvijų elektromagnetinės savybės, atlikus jų kuriamų sukamųjų magnetovarų harmonines analizes ir pagal jų rezultatus apskaičiavus elektromagnetinio efektyvumo koeficientus. Gauta, kad geriausius elektromagnetinius parametrus turi didžiausio vidutinio ir sutrumpinto žingsnio sinusinės trifazės apvijos su optimizuota sukamąja magnetovara. Eksperimentiškai išnagrinėtas gamyklinis trifazis asinchroninis 1,5 kW galios variklis su viensluoksne formine ir tas pats pervyniotas variklis su sinusine statoriaus apvija. Gamyklinio asinchroninio variklio su viensluoksne formine apvija ir pervynioto variklio su sinusine trifaze apvija visi energetiniai rodikliai apskaičiuoti atlikus jų tuščiosios veikos ir apkrovos bandymus bei panaudojus atskirų galios nuostolių metodą. Gauta, kad pervynioto asinchroninio variklio su sinusine trifaze apvija prie nurodytosios apkrovos statoriaus apvijos fazinė srovė sumažėjo 8,2 %, imama iš tinklo galia sumažėjo 5,3 %, galios nuostoliai sumažėjo 10,4 %, naudingumo koeficientas padidėjo 1,9 % ir galios koeficientas padidėjo 3,4 %, lyginant su gamyklinio asinchroninio variklio, esant tai pačiai apkrovai, atitinkamais energetiniais rodikliais. Nustatyta, kad asinchroninis variklis, turintis trifazę apviją su didesniu elektromagnetinio efektyvumo koeficientu, turi ir geresnius energetinius rodiklius. / The paper assesses the electromagnetic properties of stator winding of eight types of three-phase asynchronous motors, by performing harmonic analyses of the rotary magnetomotive forces they generate and using these results to calculate the electromagnetic efficiency coefficients. It was established that the best electromagnetic parameters are those of the sinus tri-phase winding with the largest medium and shortened step with optimised rotary magnetomotive force. Experimental analysis of a factory-made three-phase asynchronous 1,5 kW motor with a single layer form winding and the same rewound motor with sinus stator winding was performed. All energetic indicators of the factory-made asynchronous motor with a single layer form winding and the rewound motor with sinus three-phase winding were calculated after performing their no-load and load testing, and using the method of separate power loss. It was established that the phase current of the stator winding of the rewound asynchronous motor with a sinus three-phase winding, deceased by 8,2 percent at the indicated load, the power from the mains decreased by 5,3 percent, the power loss decreased by 10,4 percent, the efficiency coefficient increased by 1,9 percent and the power coefficient increased by 3,4 percent as compared to the respective indicators of the factory-made asynchronous motor at the same load. It was established that the asynchronous motor which has the three-phase winding with the larger electromagnetic... [to full text]

Baigiamajame magistro darbe nagrinėjama iešmo elektros pavara su tiesiaeigiu asinchroniniu cilindriniu varikliu. Programiniu paketu ,,Matlab“ yra sudaryti pavaros matematiniai modeliai α, β koordinačių sistemoje. Uždaviniai – tiesiaeigės iešmo elektros pavaros kompiuterinio modelio sudarymas, tyrimas ir dinaminių charakteristikų imitavimas. Literatūros analizės dalyje išnagrinėtos tiesiaeigės elektros pavaros, jų taikymo sritys bei valdymo būdai. Magistro darbo teorinėje dalyje pateikiamos tiesiaeigių elektros pavarų skaičiavimo ir valdymo metodikų analizės. Tiriamoji dalis apima iešmo elektros pavaros su tiesiaeigiu cilindriniu asinchroniniu varikliu matematinių modelių sudarymą ir dinaminių charakteristikų tyrimą programiniu paketu ,,Matlab“. Matematiniai modeliai yra sudaromi pavarai veikiant skirtingais darbo režimais (pavara perjungiama neapkrauta, pavara perjungiama apkrovus nominalia apkrova ir iešmą perjungiant pabaigoje ir pradžioje trukdant papildomai pasipriešinimo jėgai) ir tyrimo rezultatai pateikiami grafiškai. Gauti rezultatai yra palyginami ir apibendrinami. Išnagrinėjus teorinius tiesiaeigės iešmo elektros pavaros su asinchroniniu cilindriniu varikliu darbo režimų aspektus, pateikiamos išvados ir pasiūlymai. Tyrimo rezultatai gali būti panaudoti iešmo elektros pavaros su tiesiaeigiu asinchroniniu varikliu racionaliam ir optimaliam realizavimui geležinkelio transporto automatinio valdymo sistemose. Darbą sudaro 9 dalys: santrumpos ir simboliai, įvadas... [toliau žr. visą tekstą] / The final Bachelor thesis analyses point electric drive with cylinder-type linear asynchronous motor. Software package ,,Matlab“ was used to prepare mathematical models of the drive in α, β coordinate system. Objectives: preparing and analyzing a computer model of linear point electric drive, simulation of dynamic characteristics. The analysis of literary sources deals with linear electric drives, their application areas and methods of control. Theoretical part of the Master thesis presents analyses of calculation and control methods of linear electric drives. The analytical part of the thesis includes mathematical models of point electric drive with cylinder-type linear asynchronous motor and the analysis of dynamic characteristics using software package ,,Matlab“. Mathematical models were prepared when the drive operated in different modes (the drive switched without load, the drive switched with nominal load, the switch connected at the end or beginning, thereby blocking additional resistance force). Research results were presented in a graphical form. Obtained results were compared and summarized. Following the analysis of the theoretical aspects of operating modes of linear point electric drive with cylinder-type asynchronous motor, conclusions and recommendations were presented. Research results can be used for rational and optimal realization of point electric drive with linear asynchronous motor in automatic railway control systems. The thesis consists of nine parts:... [to full text]

Asimetrinė fazinių įtampų sistema stipriai pablogina asinchroninių variklių darbą. Tyrimo tikslas – ištirti trifazio asinchroninio variklio darbą, esant įvairioms maitinimo įtampos fazorių modulių asimetrijoms. Asinchroninio variklio visi energetiniai rodikliai apskaičiuoti atlikus jų tuščiosios veikos ir apkrovos bandymus bei panaudojus atskirų galios nuostolių metodą. Įtampos asimetriškumo lygis gaunamas panaudojus simetrinių dedamųjų metodą. Atsiradus asimetrijai, asinchroninio variklio oro tarpe kuriamas elipsinis sukamasis magnetinis laukas, kuris sukelia variklyje ir sukimo, ir stabdymo momentus. Tik esant simetrinei fazinių įtampų sistemai (ka = 0 %), prie variklio nurodytosios apkrovos visi kiti dydžiai gaunami nurodytieji. Teoriškai ir eksperimentiškai ištyrus 1,1 kW galios asincroninį elektros variklį gauta, kad esant asimetrinei fazinių įtampų sistemai (ka = 11 %), prie nurodytosios apkrovos asinchroninio variklio iš tinklo vartojama galia P1 padidėjo 22,4 %, apsisukimai n sumažėjo, o slydimas s padidėjo 94,7 %, galios nuostoliai ΣP padidėjo 101 %, elektromagnetinis momentas Mem padidėjo 4,9 %, naudingumo koeficientas η sumažėjo 21,4 % ir galios koeficientas cos φ sumažėjo 0,9 %. / Asymmetrical phase system of voltages significantly degrades induction motors work. The study objective - to explore the three-phase asynchronous motor at different power supply modules vector asymmetry. All energetic indicators of the asynchronous motor winding were calculated after performing their no-load and load testing, and using the method of separate power loss. Asymmetry voltage level obtained by using the method of symmetrical components. The emergence of asymmetry in the induction motor air gap created elliptical rotary magnetic field, which caused an engine torque and braking points. Only a symmetrical phase voltage system (ka = 0%), the given load on the engine all the other values given are obtained. Theoretical and experimental study of 1,1 kW electric asynchronous motor revealed that in asymmetric phase voltage system (ka = 11%), at the given induction motor load from the mains power is used in P1 increased by 22,4%, n speed decreased and the slip increased by 94,7%, power ΣP loss has increased 101%, the electromagnetic torque Mem increased by 4,9%, the efficiency η decreased 21,4% and power factor cos φ decreased by 0,9%.

Tiriamajame darbe elektromagnetiniu požiūriu palyginamos viensluoksnė forminė trifazė ir to pačio tipo šešiafazė apvijos. Atlikta šių apvijų kuriamų sukamųjų magnetovarų harmonė analizė ir pagal gautus rezultatus apskaičiuoti elektromagnetinio efektyvumo koeficientai. Gauta, kad viensluoksnė forminė šešiafazė apvija turi geresnius elektromagnetinius parametrus. Šios šešiafazės apvijos efektyvumo koeficientas yra 8,7 % didesnis nei viensluoksnės forminės trifazės apvijos. Atliktas eksperimentinis tyrimas su 1,5 kW asinchroniniu varikliu su viensluoksne formine trifaze apvija ir su tuo pačiu pervyniotu varikliu su ta pačia šešiafaze apvija. Asinchroninio variklio su viensluoksne formine trifaze apvija ir to pačio pervynioto variklio su ta pačia šešiafaze apvija visi energiniai rodikliai apskaičiuoti atlikus tuščiosios veikos ir apkrovos bandymus. Atlikus asinchroninio variklio eksperimentinius bandymus prie nurodytosios apkrovos trifaziam ir šešiafaziam asinchroniniam varikliui, buvo gauti tokie skaičiavimo rezultatai: pervynioto šešiafazio variklio statoriaus apvijos fazinė srovė sumažėjo 25 %, imama iš tinklo galia sumažėjo 10 %, galios suminiai nuostoliai sumažėjo 38 %, galios faktorius padidėjo 4 %, naudingumo faktorius padidėjo beveik 15 %, sukimosi momentas padidėjo apie 5 %. Nustatyta, kad asinchroninis variklis su viensluoksne formine šešiafaze apvija turi geresnius energinius rodiklius nei asinchroninis variklis su to paties tipo trifaze apvija. / In this research electromagnetic properties of single-layer former three-phase winding and the same type six-phase winding are assessed and compared. Harmonic analyses of magnetomotive force was carried out on the rotary forces they generate and, according to final results, the electromagnetic efficiency coefficients were calculated. It was established that electromagnetic parameters of the single-layer former six-phase winding are better. The efficiency coefficient of the single-layer former six-phase winding is 8,7 % higher compared to the same three-phase winding. The experimental analysis of a three-phase asynchronous 1,5 kW motor with a single-layer three-phase winding and the same rewound motor with the same six-phase winding was performed. All energetic indicators of the asynchronous motor with a single-layer former three-phase winding and rewound motor the same six-phase winding were calculated after performing a no-load and load tests. Performing a load testing of the asynchronous motor for single-layer three-phase winding and the same six-phase winding it was established that the current of the stator winding of the rewound asynchronous motor with a single-layer six-phase winding decreased by 25 % at the indicated load, the power from the network decreased by 10 %. Moreover, the power loss decreased by 38 %, the power factor increased by 4 %, the efficiency factor increased almost by 15 %, and the torque increased by 5 %. It was established that the asynchronous... [to full text]

This thesis deals with thermal calculation of asynchronous motor. The theoretical part deals with principles of heat transfer, which are important for thermal calculation. Another theoretical part describes asynchronous motor analysis and its loss. In the practical part, these losses together with the electromagnetic circuit are calculated. Subsequently, two thermal networks are created to calculate the warming of individual machine parts. To ensure the correctness of the result, a bound model of partial calculations of the asynchronous machine is created. The next step is to compare the calculated electrical quantities and the calculated temperatures with respect to the measured values.