期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 62, 期 2, 页码 1201-1209出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2014.2352605
关键词
Microassembly; motion and force control; piezoelectric microgripper; sampled-data systems; sliding-mode control (SMC)
资金
- Macao Science and Technology Development Fund [070/2012/A3]
- Research Committee of the University of Macau [MYRG083(Y1-L2)-FST12-XQS, MYRG078(Y1-L2)-FST13-XQS]
High-speed simultaneous position and contact force control is vital for microgrippers dedicated to automated high-throughput microassembly tasks. This paper presents the design and validation of a new robust impedance control for high-speed position and force regulation of a compliant gripper which is driven by a piezoelectric stack actuator. Unlike traditional position/force switching control, the proposed scheme enables a smooth transition between the free and constrained motions of the gripper. A single controller is devised to regulate both the gripper tip position and the contact force, rendering a simplification in control design. The stability of the closed-loop system in the presence of piezoelectric nonlinearities is guaranteed by a digital sliding mode impedance control algorithm. Moreover, the proposed control scheme is applicable to high-order systems, and the control algorithm simplification enables a high-speed loop rate. The highspeed control is realized by deploying the algorithm to a field-programmable gate array controller. The effectiveness of the proposed scheme is verified through experimental studies on grasp-hold-release operation of a graphite microrod. The control scheme can be extended to other microassembly systems as well.
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