This paper proposes a novel liner stick–slip actuator with compact structure which can achieve forward and backward motion. A novel rhombus-type displacement amplification mechanism (RTDAM) with symmetric structure is used to generate lateral motion to improve the actuator performance. Theoretical analysis and finite element analysis (FEA) are carried out to calculate the coupling ratio and natural frequency of the system. In addition, a new driving method in which two driving feet act together is proposed, which can improve the load capacity of the actuator. A prototype is fabricated and experimental tests are conducted to investigate its performance. The results indicate that the maximum speed of forward and backward motion are 428.5 μm/s and 443.2 μm/s, respectively. Compared with the single foot driving method, the load capacity of the actuator is increased from 1.2 N to 1.6 N by adopting the new driving method. Finally, a micropositioning stage is built utilizing the proposed stick–slip actuator and the experimental results indicate that the stage can work stably.

本文提出了一种结构紧凑的新型线性粘滑执行器，可以实现向前和向后运动。一种具有对称结构的新型菱形位移放大机构（RTDAM）用于产生横向运动以提高执行器性能。通过理论分析和有限元分析（FEA）计算系统的耦合比和固有频率。此外，提出了两个驱动脚共同作用的新驱动方式，可以提高执行器的负载能力。制造了原型并进行了实验测试以研究其性能。结果表明，前进和后退的最大速度分别为428.5 μm/s和443.2 μm/s。与单脚驱动方式相比，通过采用新的驱动方式，执行器的负载能力从1.2 N增加到1.6 N。最后，利用所提出的粘滑执行器构建了一个微定位平台，实验结果表明该平台可以稳定工作。