Methods of control of induction motors using a frequency converter

Predmet istraživanja ovog rada je izrada makete uz korištenje frekvencijskog pretvarača Siemens Micromaster 440 koji upravlja višebrzinskim asinkronim motorom. Maketa je izrađena u svrhu zamjenjivanja radnog procesa u elektomotornom pogonu. Na početku rada objašnjavaju se teorijska razmatranja pojedinih dijelova elektromotornih pogona, rada asinkronih motora i rada frekvencijskog pretvarača. Navode se detaljni opisi metoda upravljanja asinkronim motorom, kao što je promjena broja pari polova, promjena frekvencije i promjena klizanja. Nadalje dani su opisi vektorskog i skalarnog upravljanja frekvencijskog pretvarača. Opisani su tehnički podaci i dan je pregled svih funkcionalnosti korištenog frekvencijskog pretvarača u maketi. Izrađena maketa je opisana po svim svojim elementima i uređajima koje sadrži. Obavljeno je mjerenje u programu DASYLab – V 6.00.01 u svrhu dobivanja radnih karakteristika motora. Dan je pregled svih korištenih parametara i njegovih funkcija za dobivanje željenog radnog procesa. Cijeli rad je popraćen tablicama, dijagramima, shemama i slikama koje daju cjelokupnu sliku pravog reguliranog elektromotornog pogona.The subject of this graduate work is the production model that consist of frequency converter Siemens Micromaster 440, which is controls multi – speed induction motor. The model is made for the purpuse of replacing the work process in the electric drive. At the beginning of this graduated work the theoretical considerations of individual parts of electric drive, of induction motor operation and frequency converter operation are explained. There are given detailed descriptions for methods used for control of induction motor, such as changing the number of poles, changing frequency and changing slip. Further, there are given descriptions of vector control and scalar control which is using frequency converter. There are described all the technical data and given an overview of all functionality of frequency converter. Production model is described by all elements and devices which it contains. There is done a mesuarement in program DASYLab – V 6.00.01. in order to obtain the engine perfomance of induction motor. There are given an overview of all parameters and function to obtain working proces. Whole graduate work is accompanied by tables, charts, diagrams and pictures that are given an overall picture of the real regulated electric drives