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1.
Comparison of different stator topologies for BLDC drives
Mitja Garmut, 2020, master's thesis

Abstract: The focus of this Master's thesis was to increase the output-power density of a fractional-horsepower BLDC drive. Different stator segmentation topologies were analyzed and evaluated for this purpose. The presented analysis was performed by using various models with different complexity levels, where a Magnetic Equivalent Circuit (MEC) model and a 2D transient Finite Element Method (FEM) model combined with a power-loss model, were applied systematically. Characteristic behavior of the BLDC drive was obtained in this way. The models were validated with measurement results obtained on an experimental test drive system. The influence of the weakening of the magnetic flux density and flux linkage, due to segmentation were analyzed based on the validated models. Furthermore, the increase of the thermal-stable output power and efficiency was rated, due to the consequently higher slot fill factor. Lastly, a detailed iron-loss analysis was performed for different stator topologies. The performed analysis showed that segmentation of the stator can enable a significant increase of the output power of the discussed BLDC drives, where the positive effects of segmentation outweigh the negative ones from the electromagnetic point of view. Segmentation, however, also impacts other domains, such as Mechanical and Thermal, which was out of the scope of this thesis, and will be performed in the future.
Keywords: fractional-horsepower BLDC drive, stator segmentation, fill factor increase, thermal-stable output power, Finite Element Method model
Published: 17.11.2020; Views: 171; Downloads: 0
.pdf Full text (1,69 MB)

2.
IZGUBE TRANZISTORJEV PRETVORNIKA ZA VODENJE BLDC MOTORJA
Blaž Kobovc, 2018, diploma project paper

Abstract: V projektni nalogi smo določili izgube tranzistorjev trifaznega pretvornika za vodenje BLDC s simulacijami v simulacijskem okolju LTSpice in zgradili matematični model za njihov analitični izračun. Sestavili smo trifazni pretvornik, vezje za mrtev čas, tvorili smo PŠM in dodali bootstrap vezje za proženje zgornjih tranzistorjev. Preverili smo prevodne in stikalne izgube za 80W motor z 48V napajanjem in še za enak motor z 12V napajanjem. Zanimalo nas je, kako se odražajo izgube s spreminjanjem frekvence in mrtvega časa in kateri način ima manjše izgube. Na koncu smo preverili sestavo izgub v obeh načinih in primerjali odstopanja matematičnega modela in simulacije.
Keywords: prevodne izgube, stikalne izgube, MOSFET, BLDC, DC-AC pretvornik, LTSpice, simulacije
Published: 05.02.2019; Views: 509; Downloads: 75
.pdf Full text (2,06 MB)

3.
Razvoj perifernih vmesnikov za mobilnega robota
Miha Gabrijelčič, 2016, undergraduate thesis

Abstract: V diplomskem delu smo razvijali gonilnike za periferne enote mobilnega robota, kot so: AHRS (Attitude and Heading Reference System), BMS (Battery Management System) in krmilniki motorjev. V uvodnem delu diplomske naloge je na kratko predstavljen problem in opis izdelave. V nadaljevanju je vsako poglavje namenjeno splošnemu opisu uporabljenih komponent in njeni predstavitvi. Zraven teh pa je opisan razvoj posameznega gonilnika v programskem okolju LabVIEW in delovanje gonilnikov. V zaključku pa smo podali kratko razlago dela in vizijo za njegovo nadgradnjo.
Keywords: AHRS UM7, brezkrtačni motor, BLDC motor, BMS, gonilnik, orientacijski senzor, UART, RS-232, sbRIO-9651
Published: 16.09.2016; Views: 663; Downloads: 65
.pdf Full text (2,34 MB)

4.
DOGODKOVNO VODENJE BLAC MOTORJA
Robert Horvat, 2013, doctoral dissertation

Abstract: Doktorska disertacija prikazuje primer zelo robustne izvedbe tokovne regulacije BLAC motorja, izvedene po principu nelinearnega vodenja. Zaradi zahteve po zelo visoki dinamiki, in pretežni uporabi logičnih operacij, bo sistem izveden na FPGA električnem vezju. Osnova bo dvonivojska histerezna tokovna regulacija, ki jo odlikujejo robustnost, visoka dinamika in enostavna izvedba, kot tudi visoko in nekontrolirano število preklopov, ki predstavlja največjo pomanjkljivost te metode. Izvedba dogodkovnega vodenja ohranja vse odlike histerezne regulacije, hkrati pa močno zmanjša število preklopov. Takšen način tokovne regulacije zagotavlja sinusno komutacijo izvedeno s tabelo na FPGA, ki jo definira estimirana vrednost napetostnega sektorja. Dogodkovni princip tokovne regulacije zagotavlja strogo konvergenco po določilih Lyapunove funkcije. Dogodkovno vodenje omogoča tudi prediktivno vodenje, osnovano na kriterijski funkciji kvadratičnega pogreška.
Keywords: sinhronski motor, dogodkovno vodenje, tokovna regulacija, elektromotorni pogon, BLAC vodenje, BLDC vodenje, grafični vmesnik, končni avtomat stanj, FPGA, nadzor, emulacija mehanskega bremena, PLL filter
Published: 12.04.2013; Views: 1278; Downloads: 120
.pdf Full text (9,46 MB)

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