Analiza magnetnih razmer v zračni reži električnega motorja s trajnimi magneti
V magistrski nalogi smo se posvetili realizaciji alternativne analitično-numerične metode izračuna magnetnih razmer v zračni reži motorja s površinsko nameščenimi magneti. Metoda opisuje algoritme za izračune gostote magnetnih pretokov v zračni reži zaradi vzbujanja magnetov in zaradi vpliva toka statorskega navitja. V nadaljevanju realiziramo in opišemo kompleksno permeančno funkcijo, dodamo vpliv relativne permeabilnosti magnetov h gostoti magnetnega pretoka. Iz vseh dobljenih vrednosti nato izračunamo inducirano napetost, elektromagnetni in samodržni navor. Analitično metodo primerjamo še z metodo končnih elementov, kjer upoštevamo linearno B-H karakteristiko železa. Ugotovimo ujemanje gostot magnetnih pretokov in inducirane napetosti, slabše pa je ujemanje navorov zaradi izbrane analitične metode izračuna navorov. Na koncu dodamo še nelinearno B-H karakteristiko feromagnetnega materiala k izračunu z metodo končnih elementov in ugotovimo, da se poteki gostot magnetnega pretoka v zračni reži in potek inducirane napetosti ujemajo. Vrednosti elektromagnetnega navora pa so nekoliko manjše v tako predstavljenem stroju. Prikazana je še uporaba analitično-numerične metode, kjer smo s poskusi iskali minimalno vrednost samodržnega navora. Metoda je uporabna, dovolj natančna za osnovno optimizacijo in hitrejša od metode končnih elementov. Za nadaljnjo optimizacijo električnega stroja se nato uporablja metodo končnih elementov.
The primary objective of the master thesis was to calculate and analyse magnetic conditions within the surface mounted permanent magnet electric motors. More precisely, the distribution of magnetic flux density within the air-gap and the resulting physical quantities such as the induced voltage, the electromagnetic torque and the cogging torque were calculated and analysed. The analysis was based on an analytical-numerical model of the surface mounted permanent magnet electric motor. First, the algorithms for calculation of magnetic flux density in the air gap were developed. Second, the complex permeance function for stator slotting is defined and calculated and the relative peremeance of the rotor magnets is added into the algorithm. The developed algorithm enables calculation of radial and tangential components of magnetic flux densities produced by both the rotor permanent magnets and stator current. Based on the resulting magnetic flux densities the algorithm enables the calculation of the induced voltage, electromagnetic and cogging torque. The results obtained with the analytical-numerical model were compared with a finite element based numerical model with linear B-H characteristic of feromagnetic material. A good agreement for the magnetic flux density and the induced voltage was obtained between the two models. However, the electromagnetic and cogging torque differs due to the chosen analytical method. Therefore, the finite element model was improved with the nonlinear B-H characteristic of the feromagnetic material. The new comparison showed a difference only in electromagnetic torques due to magnetic saturation of the motor core. Finally, the applicability of the developed algorithm was tested and demonstrated for different geometries of the surface mounted permanent magnet electric motors.
2017
2017-09-21 11:04:44
1060
analitično-numerična metoda, gostota magnetnega pretoka, trajni magneti, sinhronski stroj, metoda končnih elementov, elektromagnetni navor, samodržni navor, inducirana napetost, kompleksna permeančna funkcija, algoritem
analytic-numerical method, magnetic flux density, permanent magnet, synchronous machine, finite element method, electromagnetic torque, cogging torque, induced voltage, complex permeance function, algorithm
mb22
MARTIN
MAVRIČ
70
Damijan
Miljavec
991
VisID
16
39842
Mavrič Martin - Analiza magnetnih razmer v zračni reži električnega motorja s trajnimi magneti.pdf
1534150
Predstavitvena datoteka
2017-09-21 11:04:46