磁歪式振動発電デバイスを利用した電池フリーセルフ速度センシング無線システムの特性評価

抄録

In the practical application of IoT in recent years, systems for detecting abnormalities of machine are attracting attention. However, these systems often use vibration sensor for monitoring machine vibration and batteries for power supply. We investigate battery free self-sensing wireless system using magnetostrictive vibration power generator. This system uses the generator not only for power supply but also for vibration sensor. By achieving this system, we can monitor vibration intensity of machine without maintenance in a low-cost way because the system doesn’t need to prepare the battery and vibration sensor separately. In this study, we measured characteristics of the generator as a vibration sensor. We confirmed the system can monitor variation of vibration intensity in a few % error under sinusoidal vibration of about 0.02-0.3 G and 60-120 Hz by experiment. Then we combined the generator with self-sensing wireless system and evaluated accuracy of the system under sinusoidal vibration. As a result, when a sine wave was excited at a certain speed and resonance frequency, the speed was calculated with an error of about 15% from the transmitted value, so it was possible to detect the change in speed. Furthermore, it was found that the speed can be calculated with an error of about 1% when converted from the transmitted waveform. As future prospects, we would like to reduce errors and improve system power.