Magnetski krug električnog stroja

undergraduate thesis

• Title (english): Magnetic Circuit of Electric Machines
• Author: Josip Benko
• Mentor: Ivan Gašparac (mentor)
• Committee member: Ivan Gašparac (predsjednik povjerenstva)
• Committee member: Zlatko Hanić (član povjerenstva)
• Committee member: Damir Vuljaj (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2015-09-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Magnetski krug je zatvorena putanja magnetskih silnica koje održavane magnetomotornom silom čine magnetski tok. Dok magnetski tok promatramo kao skup silnica koje prolaze kroz neku površinu. Razlikujemo glavni magnetski tok ( koristan ) i rasipni magnetski tok ( nekoristan ). Tim dvjema pojavama u svitku magnetskog kruga električnog stroja pobuđujemo elektromotornu silu, koja nam je potrebna kako bismo ostvarili pretvorbu energije. Proračunom magnetskog kruga doznajemo što se točno događa u krugu i kako se jakost magnetskog polja raspoređuje na jezgru i zračni raspor, te određujemo ukupno protjecanje i struju u krugu. Osnovni oblici magnetskog kruga električnih strojeva ovise o konstrukciji samog električnog stroja, a dijele se na magnetske krugove sa četvrtastom magnetskom jezgrom i magnetske krugove s okruglom magnetskom jezgrom. Materijali od kojih se izrađuju magnetske jezgre moraju biti magnetski materijali, a najviše se koriste feromagnetski materijali. Zavisno od kakvog je materijala napravljena jezgra, može doći do većih ili manjih gubitaka u krugu. Gubitke dijelimo na gubitke histereze ( ovise o magnetskim svojstvima materijala ) i gubitke zbog vrtložnih struja ( ovise o električnim svojstvima materijala ).

Abstract (english)

The magnetic circuit is a closed orbit of the magnetic field lines. When those lines are maintained with the magnetomotive force we get magnetic flux. The magnetic flux is a set of field lines that are passing through a surface. We distinguish between the main magnetic flux ( useful ) and leakage magnetic flux ( useless ). With these two phenomena in the coil of the magnetic circuit of the electrical machine we induce the electromotive force, which we need in order to achieve energy conversion. With the calculation of the magnetic circuit we can find out what exactly is happening within the circuit and determine how the strength of the magnetic field is distributed to the core and air gap, also determine the total flow and power within circuit. The basic shapes of the magnetic circuit of electrical machines depend on the construction of the electric machine, and are divided into magnetic circuits with a rectangular magnetic core and magnetic circuits with a round magnetic core. The materials used to produce the magnetic core must be magnetic materials, the most common type of materials that are used are ferromagnetic materials. Depending from which material is core made of, there can be major or minor losses within it. The losses are divided into hysteresis losses ( depending on the magnetic properties of the material ) and losses due to eddy currents ( depending on the electrical properties of the material ).

• Keywords: magnetski krug; električni strojevi; magnetski tok; magnetski materijali; rasipni magnetski tok: glavni magnetski tok
• Keywords (english): magnetic circuit; electrical machines; magnetic flux; magnetic materials; leakage magnetic flux; main magnetic flux
• Language: croatian
• URN:NBN: urn:nbn:hr:168:527537
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2018-02-06 07:51:29