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首页> 外文期刊>Japanese journal of applied physics >A Shear-mode Ultrasonic Motor Using Potassium Sodium Niobate-based Ceramics With High Mechanical Quality Factor
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A Shear-mode Ultrasonic Motor Using Potassium Sodium Niobate-based Ceramics With High Mechanical Quality Factor

机译：具有高机械品质因数的铌酸钾钠基陶瓷剪切模式超声波马达

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摘要

(K,Na)NbO_3-LiNbO_3-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)NbO_3 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 V_(p-p) (peak to peak).
机译：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，并将其用作超声马达的驱动元件。 （K，Na）NbO_3陶瓷的Q_m可以通过使用Li和Cu进行化学改性以及微结构控制来获得具有细晶粒的陶瓷来提高。 Q_m的晶粒尺寸依赖性与基于内部偏置场的形成以稳定畴结构的模型一致。因为陶瓷的压电常数d_（31）和d_（33）不足以用于电动机应用，所以采用剪切模式来驱动超声电动机。使用高Q_m为1400，高d_（15）为207 pC / N和高k_（15）的无铅陶瓷开发了由四个压电陶瓷板驱动的剪切模式电机。输入电压约为180 V_（p-p）（峰峰值）时，在34.5 kHz时达到了486 rpm的最高转速。

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