• Title/Summary/Keyword: Ring-type Bulk Steel

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Experimental Measurement of Magnetic Properties of a Toroidal-type Bulk Electrical Steel using B-waveform Control (자속밀도 파형제어에 의한 토로이달 벌크 전기강의 자기특성 측정)

  • Eum, Young-Hwan;Koh, Chang-Seop;Hong, Sun-Ki;Shin, Pan-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.5
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    • pp.869-875
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    • 2007
  • Magnetic properties of electrical steel are, in general. measured by using Epstein frame or single sheet tester (SST). These methods, however, require very strict regulation of a specimen in its size and shape. thus, can not be easily applied to various types of specimen. On the other hand, a ring-test method, which measures only the isotropic properties, can be easily applied to most cases because it requires a toroidal-type specimen of arbitrary size. This method, especially, is considered as an unique available method for a bulk-type specimen. In this paper, a ring-test method is developed, and applied to the measurement of magnetic properties of a bulk-type electrical steel with a toroidal-type specimen. In the measurement, the magnetic properties and iron losses are measured and compared with each other at the both sinusoidal magnetic flux density and sinusoidal magnetic field intensity conditions under 0.2Hz and 60Hz alternating magnetic fields excitation. Through experimental measurements, a sinusoidal magnetic flux density condition is proven appropriate for the measurement of magnetic properties, including iron loss characteristics, of electrical steels.

Experimental Iron loss Measurement of Ring-type Bulk Steel (Ring-type Bulk Steel의 철손측정)

  • Eum, Young-Hwan;Ham, Seung-Jin;Koh, Chang-Seop
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.43-46
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    • 2006
  • 일반적으로 전기강의 특성측정에는 Epstein frame과 Single sheet tester를 이용한 측정법이 사용된다. 그러나 위의 방법은 시료 규격이 매우 제한적이며 Sheet 형태의 시료를 요구하기 때문에 측정이 용이하지 못한 경우가 많다. 이러한 경우를 위한 측정법이 Ring test 측정법으로 시료에 제한이 적기 때문에 그 활용도가 매우 높으며 특히 Bulk 형태의 시료에 대해서는 거의 유일한 측정법이라 하겠다. 본 논문에서는 0.2Hz의 교번자계 여자를 통해 Bulk형 전기강의 특성 측정을 하였으며, 정현파 자속밀도 조건과 정현파 여자 전류 조건에서의 B-H특성과 철손을 측정, 비교하였다.

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