IEEE Trans Ultrason Ferroelectr Freq Control. 2020 Jul;67(7):1462-1469. doi: 10.1109/TUFFC.2020.2972307. Epub 2020 Feb 7.
This study proposes a rotary traveling wave ultrasonic motor utilizing the B (0, 5) axial bending mode of a ring-shaped stator. The proposed motor had a compact structure as only four groups of piezoelectric (PZT) ceramics were nested into the stator to produce a bending traveling wave, a new design method was proposed utilized less PZT ceramics to reduce the volume and to improve the mechanical output characteristics. The operating principle of the proposed motor was illustrated. The finite element analysis was performed to obtain the vibration modes and the motion trajectories of the stator. A prototype was manufactured to validate the operating principle. The two standing waves and the motion trajectories of the driving tips were measured. The results denoted that this motor obtained an output speed of 53.86 r/min under a preload of 0.69 N when the frequency and voltage were 24.86 kHz and 250 V, the maximum stall torque was tested as about [Formula: see text] under the preload of 3.14 N. Finally, this study was compared with a previous design and it was found that the volume was reduced markedly; furthermore, the no-load speed, the efficiency, the torque density and the power density were improved significantly.
本研究提出了一种利用环形定子的 B（0,5）轴向弯曲模态的旋转行波超声马达。所提出的马达具有紧凑的结构，因为只有四组压电（PZT）陶瓷嵌套在定子中以产生弯曲行波，提出了一种新的设计方法，利用较少的 PZT 陶瓷来减小体积并提高机械输出特性。说明了所提出的马达的工作原理。进行了有限元分析以获得定子的振动模式和运动轨迹。制造了一个原型来验证工作原理。测量了两个驻波和驱动尖端的运动轨迹。结果表明，当频率和电压为 24.86 kHz 和 250 V 时，在 0.69 N 的预载下，该马达获得了 53.86 r/min 的输出速度，在 3.14 N 的预载下，最大失速转矩约为[公式：见文本]。最后，将本研究与以前的设计进行了比较，发现体积明显减小；此外，空载速度、效率、转矩密度和功率密度都有显著提高。
