214 インバータ制御による誘導電動機の電磁騒音の状態監視(セッション8 事例紹介・管理運用II)

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Environmental concerns have increased demand for induction motors with low noise characteristics. Electromagnetic noise has been a particular concern. In this study, the relationship between electromagnetic noise and temperature was analyzed quantitatively. It was found the relation of electromagnetic noise and temperature as follows. In temperature 20-70℃, noise level does not varies, but in temperature 70-140℃ noise level decreases drastically by 6dB (A) at first and then increases by 3dB (A). Natural frequencies of 273Hz and 350Hz appear at 20℃, and two natural frequencies unites at 70-140℃ in the experiments. A two-degrees of freedom system with core and coil end considering temperature effects was used for calculation of natural frequency. These calculated values agreed with experimental result. The relation between variation of natural frequency and temperature in
一般社団法人日本機械学会の論文
2006-11-29