回転速度一定制御モータ推進システムにおけるプロペラ周囲気泡とスラスト変動の特性評価

抄録

In this study, we aimed to improve the propulsion efficiency of the motor drive system by suppressing the load fluctuation caused by the generation of air bubbles around the propeller. Experiments were conducted to verify the detection of air bubbles around the propeller using status monitor signals from the motor drive and the correlation between the monitor signals and the thrust in the AC motor drive system, when driven by the constant rotational speed control method. Experimental data such as the motor power fluctuation were compared, and verified by comparison with previously reported experimental results. This established that the correlation between the monitor signal from the motor drive and the bubble generation and quantity around the propeller, as well as the thrust, can be expressed using the propeller characteristic equation and the motor characteristic equation for the motor drive system when driven by the constant rotational speed control method. We showed that the monitor signal of the motor drive system can be considered a sensing signal, and used to stabilize the motor power and thrust fluctuations in the motor drive system when driven by either the constant torque control or the rotational speed control method.