• Title/Summary/Keyword: magnetic core

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Analysis of AC Arc-Welders Using FEM (유한요소법을 이용한 교류아크용접기의 해석)

  • Nam, Jae-Ho;Kuc, Tae-Yong;Jang, Young-Hak
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.53-55
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    • 1996

  • In this paper, we analyze control methods and structures of AC arc-welders, which is a prerequisite to develop a low-cost and high accurate welder. By using the finite element methods, three types of AC an-welders, movable-core, movable-coil, and saturated-reactor type, are modeled and characterized in the coupled domain of electro-magnetic system.

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A Study on the Torque Ripple Reduction of Low Voltage High Current SPMSM (저전압 대전류 SPMSM 토크리플 저감 제어)

  • Lee, Geun-Ho;Hong, Jeong-Pyo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2391-2395
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    • 2009

  • Active control schemes which modify the excitation to correct for any of the nonideal characteristics of the SPMSM is described. Especially, because of design limitations(size and cost) in automobile, the back-EMF of SPMSM can't be perfectly designed with sinusoidal wave and iron core of stator is saturated so that torque ripple is unavoidable. An active cancellation method of the pulsating torque components which would otherwise be generated using the classic sinusoidal current excitation is illustrated.

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