A shear-mode ultrasonic motor using potassium sodium niobate-based ceramics with high mechanical quality factor
A shear-mode ultrasonic motor using potassium sodium niobate-based ceramics with high mechanical quality factor
复制标题
DOI：
10.1143/jjap.47.7702
复制
发表时间：
2008-09-01
影响因子：
1.5
通讯作者：
Tsurumi, Takaaki
中科院分区：
文献类型：
--
作者：
Li, Enzhu;Kakemoto, Hirofumi;Tsurumi, Takaaki
合成了具有高机械品质因数Q（m）的（K，Na）NbO 3-LiNbO 3-CuO无铅压电陶瓷，并将其用作超声电机的驱动元件。采用Li和Cu对（K，Na）NbO_3陶瓷进行化学改性，并通过控制显微结构获得细晶陶瓷，可以提高（K，Na）NbO_3陶瓷的Q（m）值。Q（m）的晶粒尺寸依赖性与基于内部偏置场形成以稳定畴结构的模型一致。由于陶瓷的压电常数d（31）和d（33）不足以用于电机应用，因此使用剪切模式来驱动超声电机。采用高Q（m）为1400、高d（15）为207 pC/N、高k（15）为0.72的无铅陶瓷，研制了一种四片压电陶瓷驱动的剪切模式电机。在34.5 kHz时，输入电压约为180 Vp-p（峰-峰），可获得486 rpm的最高转速。
(K,Na)NbO3-LiNbO3-CuO lead-free piezoelectric ceramics that show a high mechanical quality factor Q(m) were synthesized and used as a drive element of an ultrasonic motor. The Q(m) of the (K,Na)NbO3 ceramic could be enhanced by chemical modification using Li and Cu as well as microstructure control to obtain ceramics with fine grains. The grain size dependence of the Q(m) was consistent with a model based on the formation of internal bias field to stabilize the domain structure. A shear mode was used to drive the ultrasonic motor because the piezoelectric d(31) and d(33) constants of the ceramics were not sufficient for the motor applications. A shear-mode motor driven with four piezoelectric ceramic plates was developed using the lead-free ceramics with a high Q(m) of 1400, a high d(15) of 207 pC/N, and a high k(15) of 0.72. The highest revolution speed of 486 rpm was achieved at 34.5 kHz with the input voltage of approximately 180 Vp-p (peak to peak).