Sains Malaysiana 43(6)(2014):
909–914
Simulation
and Statistical Approaches on Electrical Steel’s Magnetic Behaviour under
Unidirectional
Single Sheet Tester
(Pendekatan
Simulasi dan Statistik ke atas Kelakuan Magnet Keluli Elektrik di
bawah
Satu Arah
Penguji Kepingan Besi Tunggal)
NOOR ASHIKIN MOHD RASHID*
& WAN NOR LIZA WAN MAHADI
Electromagnetic
Radiation and Devices (EMRD), Block E, Department of Electrical Engineering
Faculty of
Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
Diserahkan: 27 Mac
2013/Diterima: 2 Disember 2013
ABSTRACT
Evaluation of magnetic properties of
electrical steel is vital in improving the quality of electrical machinery
since it is used as magnetic cores for transformers, motors and generators. A
double yoke single sheet tester (SST) was modeled using two
identical C-cores wound with copper wires at limb side in horizontal
arrangement. The magnetic properties for electrical steels, grade M4 and M19
were tested under a frequency of 50 Hz with the current ranging from 0.2 to
2.4A. The effects of the sample dimension and anisotropy on magnetic
measurements were investigated. Evaluation on specimen dimensions indicate that
the non-uniformity of sample magnetization in overhang sample can attribute to
the flux leakage between the yoke legs. The stray flux is also increased with
the overhang sample. However, the so-called fit-in sample which is fitted
nicely between the yoke end poles can minimize the effect of stray flux. One
way ANOVA and T-test were used as statistical methods and
executed at the 5% significance level. It is statistically proven that the
magnetic properties of both magnetic materials are influenced by their
anisotropy.
Keywords: Anisotropy; magnetization;
single sheet testerelectrical steel; stray flux
ABSTRAK
Penilaian sifat magnet keluli elektrik
penting dalam meningkatkan kualiti jentera elektrik kerana ia digunakan
sebagai teras magnet untuk transformer, motor dan penjana. Penguji
kepingan besi tunggal (SST) yang diperbuat daripada dua teras-C
yang sama saiznya, dililit dengan wayar tembaga di bahagian teras
anggota secara mendatar. Sifat magnet keluli elektrik, gred M4 dan
M19 diuji pada frekuensi 50 Hz dengan arus pada kadar 0.2 kepada
2.4A. Kesan dimensi sampel dan anisotropi ke atas pengukuran magnet
dikaji. ANOVA satu
hala dan ujian T digunakan sebagai kaedah statistik pada tahap kesignifikanan
0.05. Hasil statistik membuktikan sifat magnet untuk bahan magnet
dipengaruhi oleh anisotropi bahan. Penilaian ke atas dimensi sampel
menunjukkan ketidakseragaman pemagnetan sampel dalam sampel terjuntai
yang mengakibatkan kebocoran fluks di kaki dening. Fluks yang terkeluar
bertambah dengan penggunaan sampel terjuntai. Walau bagaimanapun,
penggunaan sampel yang padan di antara hujung kaki dening berupaya
mengurangkan kesan fluks yang terkeluar.
Kata kunci: Anisotropi; kebocoran fluks; keluli elektrik;
pemagnetan; penguji kepingan besi tunggal
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*Pengarang
untuk surat-menyurat; email: ashikin_rashid @yahoo.com
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