A Symmetric-Actuating Linear Piezoceramic Ultrasonic Motor Capable of Producing a Scissoring Effect

Abstract

Conventionally, to produce a linear motion, one motor’s stator is employed to drive one runner moving forward or backward. So far, there is almost no report of one electromechanical motor or piezoelectric ultrasonic motor that can directly generate two symmetrical linear motions, while this function is desired for precise scissoring and grasping in the minimally invasive surgery field. Herein, we report a brand-new symmetric-actuating linear piezoceramic ultrasonic motor capable of generating symmetrical linear motions of two outputs directly without additional mechanical transmission mechanisms. The key component of the motor is an (2 × 3) arrayed piezoceramic bar stator operating in the coupled resonant mode of the first longitudinal ( L 1 ) and third bending ( B 3 ) modes, leading to symmetric elliptical vibration trajectories at its two ends. A pair of microsurgical scissors is used as the end-effector, demonstrating a very promising future for high-precision microsurgical operations. The sliders of the prototype show the following features: (a) symmetrical, fast relative moving velocity (~1 m/s) outward or inward simultaneously; (b) high step resolution (40 nm); and (c) high power density (405.4 mW/cm 3 ) and high efficiency (22.1%) that are double those of typical piezoceramic ultrasonic motors, indicating the full capacity of symmetric-actuating linear piezoceramic ultrasonic motor working in symmetric operation principle. This work also has enlightening significance for future symmetric-actuating device designs.

Toward Compact Motorized Lens: Switch and Focus a Filter Wheel with Single Piezoelectric Tube

“…In the case of multi-DOF RPAs, the longitudinal and bending vibration modes are frequently utilized as vibration modes. [34] Moreover, the scheme of longitudinal-bending-bending (L-B-B) vibration mode is chosen to ease the difficulties of frequency degeneration since the same eigenfrequency of bending modes due to the symmetrical structure, [39,40] Several methods have been proposed to ease the effects of mechanical clamping on vibration, the most common of which is to use the commonly distributed nodes of the vibration modes as the clamping points. The combination of first-order longitudinal and second-order bending vibration modes (L1-B2) or the combination of second-order longitudinal and fifth-order bending vibration modes (L2-B5) are frequently utilized.…”

“…[31] Moreover, it can be seen from Table 1 that the conventional filter wheel was accompanied by the disadvantages of low adjustment accuracy and being time-consuming. In this regard, the characteristics of the RPA described above hopefully alleviate the problems of conventional filter wheel mechanisms [32][33][34] Therefore, it is intrinsically a good match for an MSC optical system since it can flexibly obtain the two-DOF motions through the combination of vibration modes and can be miniaturized through delicate structures, [35,36] The main contribution of this work is to propose a novel integration strategy to simplify the structure and control of the MSC optical system, and we demonstrate a simplified MSC optical system through TFFM to verify the feasibility of the proposed strategy. Specifically, the TFFM is driven by a two-DOF RPA to integrate light filtering and focusing functions.…”

Developments and Challenges of Miniature Piezoelectric Robots: A Review

“…Reproduced with permission. [ 326 ] Copyright 2023, AAAS; iv) performing the microinjection process of a zebrafish embryo by installing a glass microneedle. Reproduced with permission.…”

“…Reproduced with permission. [ 326 ] Copyright 2021, Elsevier; v) assembling a wheel of a planetary micro gear by using a micro‐gripper. Reproduced with permission.…”

“…The application scenarios of MPRs are rich and diverse since MPRs with different piezoelectric actuating elements and working principles focus on realizing different aspects of characteristics, such as high resolution up to nanometer [ 307 , 308 ] and high speed up to hundreds of millimeters per second. [ 309 , 310 ] Therefore, we try to sort out the applications of MPRs into two categories, including the applications with fast macro motion and the applications of with precise micro motion.…”