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Title:NAČRTOVANJE NAVITIJ TRANSFORMATORJEV ZA UPOROVNO TOČKASTO VARJENJE
Authors:ID Popović Cukovic, Jelena (Author)
ID Dolinar, Drago (Mentor) More about this mentor... New window
ID Polajžer, Boštjan (Comentor)
Files:.pdf DR_Popovic_Cukovic_Jelena_2013.pdf (4,41 MB)
MD5: F96C651B3EB94BAAABEF6F877FC0E2F2
PID: 20.500.12556/dkum/fccaedda-c066-4c3c-be18-7f3e9b830b9d
 
Language:Slovenian
Work type:Dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:Disertacija obravnava različne možnosti določitev joulskih izgub v navitjih transformatorjev za uporovno točkasto varjenje. Pri podanih vzbujalnih frekvencah se tokovna gostota v navitjih varilnega transformatorja zaradi posledic sosedstvenega pojava med posameznimi tuljavami navitji porazdeli neenakomerno. Neenakomerna porazdelitev tokovne gostote v tuljavah zaradi upoštevanega sosedstvenega pojava ima za posledico večje joulske izgube, kot bi jih izračunali pri enakomerni tokovni obremenitvi brez upoštevanja sosedstvenega pojava. Jasno se pokaže, da izrazitost sosedstvenega pojava s frekvenco narašča. Zato je določitev porazdelitve tokovne gostote v tuljavah primarnega in sekundarnega navitja ključnega pomena pri nadaljnem izračunu joulskih izgub. Za določitev porazdelitve tokovne gostote je razvita razširjena analitična metoda postopnega približevanja, ki ne upošteva prisotnosti železnega jedra transformatorja. S pomočjo razvite razširjene metode postopnega približevanja so zajeti medsebojni vplivi med vsemi tuljavami primarnega in sekundarnega navitja. Za izračun joulskih izgub je uporabljen splošen zapis, ki upošteva porazdelitev tokovne gostote in specifično prevodnost materiala. Primerjava dveh metod za analitično računanje joulskih izgub v navitjih transformatorja in sicer razširjene metode postopnega približevanja in Dowellove metode je pokazala bistvene prednosti prve. Prednost razvite analitične metode postopnega približevanja pred obstoječo Dowellovo metodo je potrjena z izračuni joulskih izgub v navitjih na numeričnem modelu transformatorja s pomočjo končnih elementov in z laboratorijskimi meritvami. Za predstavljeno metodo postopnega približevanja je značilna ustrezna točnost izračunanih joulskih izgub in bistveno večja hitrost računanja, kot pri metodi končnih elementov, zato je zelo primerna za izvajanje optimizacij. Prav zato je opisani analitični izračun joulskih izgub v navitjih zasnovan na parametrično podanem modelu navitji transformatorja in omogoča hitre izračune izgub za poljubne mere navitij in poljubno vzbujalno frekvenco.
Keywords:uporovno točkasto varjenje, varilni transformator, navitja varilnega transformatorja, kožni pojav, sosedstveni pojav, metoda postopnega približevanja, metoda končnih elementov, joulske izgube v navitjih
Place of publishing:Maribor
Publisher:[J. Popović Cukovic]
Year of publishing:2013
PID:20.500.12556/DKUM-40178 New window
UDC:621.314.2:621.791.037(043.2)
COBISS.SI-ID:266391296 New window
NUK URN:URN:SI:UM:DK:WCOUWF8G
Publication date in DKUM:10.05.2013
Views:3558
Downloads:453
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FERI
:
POPOVIĆ CUKOVIC, Jelena, 2013, NAČRTOVANJE NAVITIJ TRANSFORMATORJEV ZA UPOROVNO TOČKASTO VARJENJE [online]. Doctoral dissertation. Maribor : J. Popović Cukovic. [Accessed 29 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=40178
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Secondary language

Language:English
Title:DEVELOPMENT OF WINDING DESIGN FOR RESISTANCE SPOT WELDING TRANSFORMERS
Abstract:The doctorate thesis describes various methods for Joule loss calculation in windings of resistance spot welding transofrmers. Due to the proximity effect between the individual coils of the windings, the current density distributes non-uniformly at the given operating frequencies. Non-uniformly distributed current density caused by the consequnces of the proximity effect, increases Joule loss in windings in comparison to the case, where the current density distributes uniformly. It is clearly shown that the proximity effect increases with frequency. Therefore, it is significant to determine the current distribution in windings applied in further Joule loss calculation. An advanced analytical method of successive approximation, which does not take into consideration the iron core of the transformer, is developed to enable such calculations. Within the developed method, all mutual ifnluences among the transformer coils are taken into consideration. Calculation of Joule loss is based on the general equation that includes current density and specific conductivity. The comparison of two methods for analytical calculation of Joule loss in transformer windings respectively the advanced analytical method of successive approximation and Dowell method shows the significant advantages of the former. The advantage of the developed analytical method is confirmed with numerical results obtained by finite element method and experimental tests. The presented advanced analytical method of successive approximation is based on the analytical equations and, therefore enables higher level of results accuracy and less time-consuimng analysis. Moreover, it is suitable for implementation of the optimization procedures. The described analytical calculation of Joule loss is based on the parametric winding model and enables quick calculations for any transformer dimensions and operating frequencies.
Keywords:resistance spot welding, welding transformer, welding transformer windings, skin effect, proximity effect, analytical method of successive approximation, finite element methods, winding Joule loss


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