On the basis of eutectic behavior of PbTiO3-PbZrO3-Bi(Zn0.5Ti0.5)O-3 ternary system, perovskite-structured Pb0.98Bi0.02Zr0.51Ti0.48Zn0.01O3 ceramics were able to be prepared using conventional electronic ceramic processing at low sintering temperature compatible with Ag as inner electrode materials, promising for co-firing technology to fabricate monolithic multilayer piezoelectric transducers. The dependence of its piezoelectric properties on sintering temperature and various dopants were investigated experimentally and a piezoelectric property with dielectric constant of epsilon(T)(33)/epsilon(0) = 1190, dielectric loss of tan delta = 0.6%, piezoelectric coefficient of d(33) = 270 pC/N, planar coupling coefficient of k(p) = 0.54, thickness coupling coefficient of k(t) = 0.46 and Curie temperature of T-c = 346 degrees C was obtained for the 0.5% Co-doped Pb0.98Bi0.02Zr0.51Ti0.48Zn0.01O3 ceramics sintered at 950 degrees C. (c) 2011 The Japan Society of Applied Physics

Perovskite-structured Pb0.6Bi0.4(Ti0.75Zn0.15Fe0.1)O-3 ceramic patches were prepared with conventional electronic ceramic processing on the basis of its near-zero thermal expansion coefficient, in contrast to most of PbTiO3-based solid solutions with decreasing tetragonality and Curie temperature. For the 1% Nb+0.5% Mg-doped samples sintered at 1050 degrees C, enhanced tetragonality of c/a=1.100 and Curie temperature of T-c=705 degrees C, dielectric constant of epsilon=204, dielectric loss of tan delta=1.7%, and piezoelectric constant of d(33)=2.0 pC/N were obtained.

介绍了V形超声电机的结构和驱动原理。利用有限元理论建立了具有复杂形状的V形超声电机定子的动力学模型,并对定子的动力学特性进行了求解。利用参数化语言APDL编程对电机定子进行相应的优化计算,优化了定子压电陶瓷的安装配置形式,提高了驱动端面质点的振幅。研究表明,优化后的定子结构满足了预期的设计要求,并且提高了计算精度和设计效率。

摩擦界面对超声电机的性能有至关重要的影响。文章针对一种基于面内振动的直线驻波超声电机,结合电机的工作振型,对电机的定、转子的接触过程进行了详尽的论述,建立了堵转情况下的最大输出力模型;并进行了仿真研究。通过仿真可以得出超声电机的堵转推力受定、转装配间隙的影响最大。在电机已完成制造的情况下。如要得到较大的堵转推力,可适当调整定转子的装配间隙。

对已有的直线超声波电动机进行改进,研究了一种新的微型直线超声波电动机,采用了压电叠堆,具有低驱动电压、结构简单、装配方便的特点。压电叠堆通过自主设计完成。电机定子使用对称和反对称模态作为工作模态,在ANSYS软件中使用有限元