電磁トランスデューサのインピーダンスのモデル化に関する一考察

渦電流の考慮による非有理伝達関数の導出

抄録

Electromagnetic transducers have the characteristics of actuators, sensors, or both. By using these characteristics, there is the vibration control technique that called electromagnetic shunt damping. This technique is passive damping, and therefore, modeling accuracy of electromagnetic transducer is very important, in especially high frequency. However, we observed that conventional model of electromagnetic transducer does not match the experimental results of frequency responses in high frequency. This paper proposes a novel model which has higher accuracy compared with conventional model in high frequency. To improve the modeling accuracy in high frequency, this paper derives the novel model of electromagnetic transducer considering eddy current generated in electromagnetic transducer. The derived model is represented as an irrational transfer function. The validity of the proposed model is demonstrated by performing experiments. The experimental result shows that the accuracy of the proposed model is higher than that of the conventional model.