Uran Suzana, Bratina Božidar, Šafarič Riko
Laboratory for Cognitive Systems in Mechatronics, Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška c. 46, SI-2000 Maribor, Slovenia.
Micromachines (Basel). 2019 Nov 23;10(12):809. doi: 10.3390/mi10120809.
Constructing micro-sized machines always involves the problem of how to bring the energy (electric, magnetic, light, electro wetting, vibrational, etc.) source to the device to produce mechanical movements. The paper presents a rotational micro-sized motor (the diameter of the rotor is 350 µm) driven by low frequency (200-700 Hz) circular vibrations, made by two piezoelectric actuators, through the medium of a water droplet with diameter of 1 mm (volume 3.6 µL). The theoretical model presents how to produce the circular streaming (rotation) of the liquid around an infinitely long pillar with micro-sized diameter. The practical application has been focused to make a time-stable circular stream of the medium around the finite long vibrated pillar with diameter of 80 µm in the presence of disturbances produced by the vibrated plate where the pillar is placed. Only the time-stable circular stream in the water droplet around the pillar produces enough energy to rotate the micro-sized rotor. The rotational speed of the rotor is controlled in both directions from -20 rad/s to +26 rad/s. 3D printed mechanical amplifiers of vibrations, driven by piezoelectric actuators, amplify the amplitude of the piezoelectric actuator up to 20 µm in the frequency region of 200 to 700 Hz.
构建微型机器始终涉及如何将能量（电、磁、光、电润湿、振动等）源引入设备以产生机械运动的问题。本文介绍了一种由低频（200 - 700 Hz）圆形振动驱动的旋转微型电机（转子直径为350 µm），该振动由两个压电致动器产生，通过直径为1 mm（体积3.6 µL）的水滴作为介质。理论模型展示了如何在无限长的微径柱体周围产生液体的圆形流动（旋转）。实际应用聚焦于在放置柱体的振动板产生的干扰存在的情况下，围绕直径为80 µm的有限长振动柱体形成介质的时间稳定圆形流。只有柱体周围水滴中的时间稳定圆形流产生足够的能量来旋转微型转子。转子的转速在 - 20 rad/s至 + 26 rad/s的两个方向上进行控制。由压电致动器驱动的3D打印振动机械放大器在200至700 Hz的频率范围内将压电致动器的振幅放大至20 µm。
