基于双定子直线超声电机的移动平台设计

设计了一个新型的直线超声电机移动平台,该平台利用超声电机的并联技术,采用对称的双定子推动直线导轨滑动。定子采用矩形板结构和一端铰支的夹持方式,其工作模态选用矩形结构的一阶弯曲振动模态和一阶纵向振动模态。分析表明,与其他振动模态相比,矩形板结构的一阶振动模态具有较高的输出效率;双定子对称结构能减小定子与直线导轨间预压力对移动平台的影响,利于直线导轨运行稳定性的提高;定子一端铰支的夹持方式能增加定子夹持的切向刚度,可提高平台输出力。该文最后通过实验测试了双定子平台的输出特性。实验结果表明,双定子平台的负载达到8.5kg,最大空载速度为305mm/s,与单定子平台相比,其负载增加了70%。

Design of a Mobile Platform Based on Linear Ultrasonic Motor With Double Stators

In this paper, a new platform based on linear ultrasonic motor is designed. The parallel technology of ultrasonic motor is utilized in the design and the symmetrical double stators are used to drive the slider. The rectangular plate structure and clamping method of one end hinged support are adopted in the stator. The first order flexural vibration mode and the first order longitudinal vibration mode of the stator are chosen as the working modes. The analysis result shows that the first order vibration mode of the stator has higher output efficiency compared with the other vibration modes; the symmetrical double stators can reduce the influence of the pre pressure between the stator and the slider on the mobile platform, which can improve the stability of the platform. One end hinged support of the clamping part can increase the tangential stiffness of stator, which can improve the output force of the platform. Finally, the output characteristics of the double stator platform are tested by experiments. The results show that the load of the proposed double stator platform is up to 8.5 kg which is increased by 70% compared with the single stator platform and the maximum no load speed is 305 mm/s.