一种矩形板四足驱动旋转超声波电机的设计与仿真

Design and Simulation of a Rectangular Plate Four-legged Driving Rotary Ultrasonic Motor

为了拓展超声波电机的应用领域,提出了一种贴片式超声波电机。该电机利用压电陶瓷片d31横向振动模态激励矩形板产生变形,激发四个驱动足端面产生椭圆轨迹运动经摩擦耦合推动转子连续旋转。对定子组件的结构进行了优化设计,之后利用有限元法进行模态分析,提取到所需的谐振频率为22.244kHz,输入两相20Vp-p激励电压后得到了定子驱动足端面的椭圆运动轨迹。研究表明,提出的超声波电机驱动足采用摩擦面,相比于以往仅靠点摩擦驱动转子的超声波电机增加了定、转子之间的接触面积,提高了能量转换效率;同时贴片式结构为超声波电机的小型化提供了理论基础。

In order to expand the application field of ultrasonic motor,a patch type ultrasonic motor was proposed in this paper.The motor used transverse vibration mode of piezoelectric ceramic d31 to excite rectangular plate to produce deformation,and excited elliptical trajectory motion of four driving foot ends to drive the rotor to rotate continuously through friction coupling.The structure of the stator assembly was optimized.The optimized stator of the ultrasonic motor was analyzed by finite element method.The required resonant frequency of the stator is 22.244 kHz.The three-dimensional motion of the particle at the end of the stator driving foot is elliptical motion after the input of two-phase 20Vp-p excitation voltage.In this paper,an inclined contact end surface was used to drive the foot of the ultrasonic motor,which increased the contact area between the stator and the rotor and improved the energy conversion efficiency compared with the traditional ultrasonic motor which only drived the rotor by point friction.At the same time,the patch structure is of great significance for the miniaturization of the ultrasonic motor.