Piezoelectric motor12/4/2023 In addition, since there is a deadzone in ultrasonic devices as a result of its driven by friction, the displacement resolution is generally in submicron level 13, 16, 27, 28. However, to obtain high output velocity, this kind of devices tend to take the longest side as the driving end, making them difficult for miniaturization and integration. Utilization of the coupling of two orthogonal vibration modes is the most widely driving principle of piezoelectric motors, such as the coupling of the first longitudinal (L 1) mode and the second bending (B 2) mode 24, 25, 26. Under the excitation of external electric fields, the piezoelectric materials can generate stresses and strains via inverse piezoelectric effect to make the piezoelectric materials vibrate at standing wave frequency 23. In addition, due to the advantage that the output power density is almost independent of dimensional changes 21, piezoelectric devices are promising to simultaneously achieve miniaturization, nanoscale resolution and fast response 5, 22. ![]() They are widely used in aerospace 8, 9, precision positioning systems 10, 11, 12, automatic zoom lens 1, 13, 14, bio-technology and medicine 15, 16, 17, and nano-/micro-electromechanical systems (NEMS/MEMS) 18, 19, 20. Compared with traditional electromagnetic motors/actuators, electromechanical devices possess the advantages of fast response, low noise, compact size and no electromagnetic interference, thus have attracted considerable attentions in last two decades 5, 6, 7. With the rapid development of micro-machinery, micro-manufacturing, minimally invasive robot, micro-electronics and other high-tech areas, the electromechanical devices with high motion speed, miniaturized size and high resolution are highly desired 1, 2, 3, 4. This work sheds a light on optimizing the performance of state-of-the-art electromechanical devices and may inspire new devices based on multi-vibration modes. ![]() Furthermore, its moving resolution is around 3 nm, which is two orders higher than that of other piezoelectric motors. Due to the ultrahigh strain of the 31–36 coupled vibration mode, the velocity per volume of the motor reached 4.66 s −1 mm −2. Based on this orderly stacked structure with two piezoelectric strain units stator, we made a miniature ultrasonic motor (5 mm Length × 1.3 mm Height × 1.06 mm Width). As an example, an orderly stacked structure with two piezoelectric strain units stator, corresponding to 31–36 coupled vibration mode, was designed and fabricated. ![]() In this work, an orderly stacked structure with piezoelectric strain units is proposed to achieve all nonzero piezoelectric coefficients, and consequently generate artificially coupled multi-vibration modes with ultrahigh strains. However, for the generally used piezoelectric materials, e.g., lead zirconate titanate ceramics, most of piezoelectric coefficients in the piezoelectric matrix are equal to zero, resulting in many piezoelectric vibration modes cannot be excited, which hinders the design of piezoelectric devices. The excitation of single or coupled vibration modes of piezoelectric devices is mainly related to the structure and property of piezoelectric materials. ![]() Piezoelectric devices based on a variety of vibration modes are widely utilized in high-tech fields to make a conversion between mechanical and electrical energies.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |