Uran Suzana, Malok Matjaž, Bratina Božidar, Šafarič Riko
Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška c. 46, 2000 Maribor, Slovenia.
Micromachines (Basel). 2021 Feb 11;12(2):177. doi: 10.3390/mi12020177.
Constructing a micro-sized microfluidic motor always involves the problem of how to transfer the mechanical energy out of the motor. The paper presents several experiments with pot-like microfluidic rotational motor structures driven by two perpendicular sine and cosine vibrations with amplitudes around 10 μm in the frequency region from 200 Hz to 500 Hz. The extensive theoretical research based on the mathematical model of the liquid streaming in a pot-like structure was the base for the successful real-life laboratory application of a microfluidic rotational motor. The final microfluidic motor structure allowed transferring the rotational mechanical energy out of the motor with a central axis. The main practical challenge of the research was to find the proper balance between the torque, due to friction in the bearings and the motor's maximal torque. The presented motor, with sizes 1 mm by 0.6 mm, reached the maximal rotational speed in both directions between -15 rad/s to +14 rad/s, with the estimated maximal torque of 0.1 pNm. The measured frequency characteristics of vibration amplitudes and phase angle between the directions of both vibrational amplitudes and rotational speed of the motor rotor against frequency of vibrations, allowed us to understand how to build the pot-like microfluidic rotational motor.
构建微型微流控电机始终涉及如何将机械能从电机中输出的问题。本文介绍了几个实验，这些实验采用了罐状微流控旋转电机结构，该结构由两个垂直的正弦和余弦振动驱动，在200赫兹至500赫兹的频率范围内，振幅约为10微米。基于罐状结构中液体流动数学模型的广泛理论研究，是微流控旋转电机在实际实验室成功应用的基础。最终的微流控电机结构能够将旋转机械能从带有中心轴的电机中输出。该研究的主要实际挑战在于，要在轴承摩擦力产生的扭矩与电机最大扭矩之间找到适当的平衡。所展示的电机尺寸为1毫米×0.6毫米，在两个方向上的最大转速均达到-15弧度/秒至+14弧度/秒，估计最大扭矩为0.1皮牛米。通过测量振动幅度的频率特性以及电机转子的两个振动幅度方向与转速之间的相位角随振动频率的变化，我们得以了解如何构建罐状微流控旋转电机。
