三相変圧器鉄心の三次元振動解析

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  • 大村 健
    JFEスチール（株） スチール研究所 倉敷地区
  • 山口 広
    JFEスチール（株） スチール研究所 千葉地区
  • 石垣 雄亮
    JFEスチール（株） スチール研究所 京浜地区
  • 岡部 誠司
    JFEスチール（株） スチール研究所 倉敷地区
  • 戸田 広朗
    JFEスチール（株） スチール研究所 倉敷地区

書誌事項

タイトル別名
  • 3D Vibration Analysis on Three Phase Transformer Cores
  • サン ソウヘンアツキ テッシン ノ サンジゲン シンドウ カイセキ

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説明

The 3D vibration and 3D magnetostriction of a model transformer core made up of grain-oriented electrical steel sheets were studied by using laser Doppler vibrometry, an accelerometer and strain gauges. The following results were obtained. The magnetostriction of the transformer core at the T-joint and the corner area including the joint part displayed several times larger amplitude than that of a single sheet under sinusoidal excitation. The out-of-plane vibration of the transformer core showed a much larger amplitude than the in-plane vibration. It is considered that the out-of-plane vibration was the main cause of acoustic noise. The amplitude of in-plane vibration of the core can be explained for the magnetostriction amplitude in the in-plane direction. On the other hand, the out-of-plane vibration was tens of times larger than the vibration calculated from the magnetostriction amplitude in the out-of-plane direction. Furthermore, the same result, that out-of-plane vibration is larger than in-plane vibration, was also obtained by measuring a practical transformer core, and the frequency spectrum of acoustic noise presented a similar frequency spectrum to that of out-of-plane vibration.

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