導体電流によって発生する変圧器騒音の解析

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The purpose of this study is to reduce the structural noise level caused by the electromagnetic force of coils for front-loading design of the transformer noise. To research the phenomenon of electromagnetic-induced vibration, first we observed the radial and vertical directional vibration of coils, and confirmed the radial directional vibration amplitude can not be ignored compared to the vertical directional vibration amplitudes. Thus, for the analysis of the electromagneticinduced vibration noise, we found the continuum mechanics model to be necessary, and the old analysis model using mass and springs cannot simulate the vibration. Second, we made the proposed model of continuum mechanics and the old model using mass and springs for a transformer, and calculated the vibration modes and responses of the coils. The calculation results of the proposed model were in good agreement with the experimental results, but the old model was not in good agreement. Finally, we calculated the vibration level with the proposed model of the transformer and the tank, as well as the vibration level of the tank, by coupled fluid analysis and structure-born sound analysis. Also, we calculated the noise level around the tank with boundary element analysis. Considering the vibration mode differences between the calculation model and practical model, we could analyze the noise level within 5 dB error. Furthermore, we could obtain the highest vibration level when the vibration resonant frequency agreed with twice the driving frequency.

導体電流によって発生する変圧器騒音の解析

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