【摘要】 为了提高螺纹副驱动型超声电机的输出力,改善定子与输出轴间的接触驱动状态,将12片压电片粘贴至筒状金属弹性体外表面构成定子,激发定子产生一个沿圆周方向行进的波长数为3的驱动行波,实现对螺纹输出轴的驱动,提出一种多波长激振模式的螺纹副驱动型超声电机。给出了电机的设计结构,阐明了定子多波长激振模式的激励方法,利用有限元法对定子的振动模态进行了仿真分析,研制出一台定子尺寸长×宽×内径为36 mm×30 mm×M24 mm的原型样机。实验结果表明,采用多波长激振模式可以实现螺纹副驱动型超声电机的有效驱动,电机的输出速度与输出力随激励电压的增大而线性增大。样机工作频率为52.1 k Hz,在激励电压有效值42 V时,最大输出力可达40 N。更多还原

【Abstract】 To increase the output force and improve the contact driving status between stator and output shaft of screw type ultrasonic motor,a cylindrical stator by attaching 12 PZT plates on a metal elastomer was presented. A traveling wave with the 3 wavelengths processing along the circumference of stator was excited to drive the screw output shaft. And a novel screw type ultrasonic motor utilizing the multi-wavelength exciting mode was proposed. The design of ultrasonic motor was given out. The exciting method of multi-wavelength exciting mode was clarified. A vibration mode simulation of stator was carried out by the finite element method. A prototype of screw type ultrasonic motor utilizing the multi-wavelength exciting mode was developed. The dimension of stator is 36 mm × 30 mm × M24 mm( length × width × inner diameter). The testing results indicate that the prototype utilizing the multi-wavelength exciting mode can be driven availably. The output velocity and force increase linearly as the exciting voltage rises. A maximum output force 40 N can be obtained at a 52. 1 k Hz working frequency and an exciting voltage of effective value 42 V.更多还原