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Research on Dynamic Vibration of Transformer With Wireless Power Transfer System Load

机译：带有无线输电系统负载的变压器动态振动研究

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The total noise level of transformers is mainly influenced by harmonics in load current. The reasons are the interaction of harmonics with large load current at power frequency and the rising sound radiation efficiency with frequency. It is noted that the dynamic vibration behaviors under load harmonics operation are important to decrease the equipment noise. This paper mainly studies the vibration noise effects of three-phase three-leg transformer with the load of wireless power transfer (WPT) system, which would bring harmonics in the load current. Accelerometer sensors were arranged on the surface of the cores and windings of the transformer. Then, the vibration was measured in different positions of a transformer under the power of WPT system from 0 to 20 kW. The spectral distribution of vibration was obtained through the fast-Fourier transform analysis of the acquisition signals. The experimental results with and without PWT load imply that the harmonics in load-current have great effect on the vibration noise. It is to conclude that the main several harmonics of load current should be eliminated to reduce the vibration noise level.
机译：变压器的总噪​​声水平主要受负载电流谐波的影响。原因是谐波在功率频率下与大负载电流的相互作用以及声辐射效率随频率的升高而相互作用。注意，负载谐波操作下的动态振动行为对于降低设备噪声很重要。本文主要研究三相三脚变压器在无线功率传输（WPT）系统的负载下的振动噪声效应，该噪声会在负载电流中产生谐波。加速度传感器安装在变压器铁心和绕组的表面上。然后，在WPT系统的功率从0到20 kW的情况下，在变压器的不同位置测量振动。振动的频谱分布是通过对采集信号进行快速傅里叶变换分析获得的。有无PWT负载的实验结果表明，负载电流中的谐波对振动噪声有很大影响。结论是应消除负载电流的主要几个谐波，以降低振动噪声水平。

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