The Impact of Vibration Due to Magnetostriction on the Core Losses of Ferrite Toroidals Under DC Bias
The Impact of Vibration Due to Magnetostriction on the Core Losses of Ferrite Toroidals Under DC Bias
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DOI：
10.1109/tmag.2011.2129523
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发表时间：
2011-03
影响因子：
2.1
通讯作者：
C. Baguley;U. Madawala;B. Carsten
中科院分区：
文献类型：
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作者：
C. Baguley;U. Madawala;B. Carsten
在电力电子电路中，变压器和电感的铁氧体铁芯通常在直流偏置条件下励磁。先前的研究结果显示，随着直流偏置，铁芯损耗显著增加，并对原因进行了各种解释。本文提出的测量结果表明，铁芯损耗与直流偏置引起的磁致伸缩振动之间存在很强的相关性。测量是在功率级材料铁氧体环形铁芯上进行的，频率等于和远离磁机械共振。基于这一证据，我们提出了导致铁芯损耗随直流偏置而增加的机制是随直流偏置而增加的振动，损耗取决于振动波形的幅度和性质。文中还描述了岩心损耗随振动增大的方法。
The ferrite cores of transformers and inductors are commonly excited under dc bias conditions in power electronic circuitry. Results have previously been presented showing core losses increase significantly with dc bias, along with various explanations for the cause. This paper presents measurements showing a strong correlation between core losses, and the magnetostrictive vibration caused by the presence of a dc bias. The measurements are made on power grade material ferrite toroidal cores at frequencies equal to, and distant from magnetomechanical resonance. Based on this evidence it is proposed that a mechanism causing core losses to increase with dc bias is the increase in vibration with dc bias, with losses being dependent on the amplitude and nature of the vibration waveform. The means by which core losses increase with vibration are also described.