diplomsko delo
Kaja Sedej (Author), Milan Bizjak (Mentor)

Abstract

Za mehkomagnetno oziroma elektropločevino iz silicijevega jekla so značilne nizke izgube in visoka relativna permeabilnost. Glede na magnetne lastnosti in namen uporabe ločimo orientirano in neorientirano pločevino. Slednja se uporablja za izdelavo jeder v elektromotorjih, ki jih lahko najdemo na različnih področjih našega vsakdana. Poleg izgub in relativne permeabilnosti na izkoristek električnih strojev vplivajo tudi vsebnost kemijskih elementov, rezanje, debelina pločevine in drugo. V diplomski nalogi smo raziskovali vpliv kemijske sestave in robnega efekta na magnetne lastnosti neorientirane elektropločevine. Zanimal nas je predvsem vpliv koncentracije silicija in skupne dolžine roba pri isti dolžini vzorca. Uporabili smo material štirih različnih dobaviteljev, ki se je razlikoval po vsebnosti silicija. Pločevina je bila kakovostnega razreda M400-50A oziroma M530-50A. Magnetne meritve smo opravili z metodo Epstein okvirja na vzorcih, ki so imeli različno število reznih robov. Rezanje vzorcev na polovico, tretjino in petino celotne širine 30 mm smo izvedli s štancnim orodjem. Iz elektromagnetnih meritev smo izdelali krivulje magnetenja, relativne permeabilnosti in skupnih izgub. Izvedli smo tudi meritve mehanskih lastnosti, in sicer smo merili trdoto (HV) ter opravili natezni preizkus. Kemijsko sestavo smo določili z optičnim emisijskim spektrometrom (OES). Izdelali smo tudi obruse in s svetlobnim mikroskopom določili območje deformirane cone. Morfologijo prelomne površine smo analizirali s pomočjo vrstičnega elektronskega mikroskopa.

Keywords

elektropločevina;magnetne lastnosti;vsebnost silicija;rezanje;magnetne izgube;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL NTF - Faculty of Natural Sciences and Engineering
Publisher: [K. Sedej]
UDC: 669
COBISS: 1843039 Link will open in a new window
Views: 715
Downloads: 265
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Other data

Secondary language: English
Secondary title: influence of the boundary effects on the magnetic properties disoriented electromagnetic steel with different silicon content
Secondary abstract: Soft magnetic or silicon electrical steel sheets are characterized by low total losses and high relative permeability. Depending on the magnetic properties and purpose of use, electrical steels are classified into two groups, grain-oriented and non-grain-oriented. Non-oriented electrical steel is used to make cores for electric motors that can be found in various areas of our everyday life. In addition to losses and relative permeability, the efficiency of electrical machines is also influenced by the chemical content of elements, cutting, sheet thickness etc. In diploma work, we researched the influence of chemical composition and boundary effect on the magnetic properties of non-oriented electrical steel sheets. The focus was on the influence of silicon concentration and total length of the edge at the same length of the sample. The material that we used was from four different suppliers, which differed in silicon content. Two grades of electrical steels were used: M400-50A and M530-50A. Magnetic measurements were performed using the Epstein frame method on samples with a different number of cutting edges. Cutting of samples to half, one-third and one-fifth of their total width of 30 mm was carried out with a punching tool. From electromagnetic measurements, we plotted the curves of magnetization, relative permeability and total power losses. Furthermore, we performed measurements of mechanical properties, such as hardness (HV) and tensile test. Chemical composition of the material was determined with an optical emission spectrometer (OES). We also prepared samples to determine the deformed zone using an optical microscope. We analysed the fracture surface morphology with the help of a scanning electron microscope.
Secondary keywords: electrical steel sheet;magnetic properties;silicon content;cutting;magnetic losses;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Naravoslovnotehniška fak., Odd. za materiale in metalurgijo
Pages: XIII, 39 f.
ID: 11232972