中文摘要：

随着超声电机应用的进一步深入，在工业机器人、航空航天等应用领域，需要一种具有较大输出力的直线型超声电机。因此，如何提高直线型超声电机的输出力成为超声电机研究者所关心的课题，国内外很多学者都曾致力于大输出力的直线型超声电机的研究，以进一步扩大其应用领域。目前，国内外的研究多集中于电机内部结构的各种改进方案上。1999年，日本学者Kurosawa提出了一种可用于直线型超声电机的高速、大推力压电振子，该振子利用面外振动模态工作。加上动子，即可构成直线型超声电机，它具有结构简单，输出速度和力较大的特点。该文采用运动矢量分析法，对该种电机的运动机理进行分析，并在此基础上设计制作了样机，该样机的最大速度可达0．9m／s，最大推力可达20N。

英文摘要：

With the development of the ultrasonic motors in depth, linear ultrasonic motors with large thrust are needed in the applications to the robots, aeronautics and astronautics etc. So, how to increase the output force of the linear ultrasonic motor has become an interested subject for the researchers. Although many peopole has devoted much efforts to study the linear ultrasonic motor with large thrust, all the studies focused on the improvement of the internal structures of the ultrasonic motors. In 1999, Kurosawa developed a piezoelectric actuator with high speed and large thrust using the out-of-plane mode. The piezoelectric actuator was characterized by simple structure, high output speed and large force. This paper analyzed the operating principle of this motor in detail. Based on the analytic results, a prototype of the motor was designed and fabricated. The highest no-load speed of 0.9 m/s and the largest thrust of 20 N have been achieved.