Fuzzy Incremental Controller for SMA Smart Actuator With Application to Micro-Positioning

Bassiuny, A. M.; Ismail, M. A.; Bakr, E. M.
January 2014
Journal of Control Engineering & Technology;Jan2014, Vol. 4 Issue 1, p58
Academic Journal
Actuators based on shape memory alloy SMA have a high power to weight ratio and have found applications in many areas including micro-mechatronics and light robotics. However, SMA actuators require a smart control system to compensate nonlinear dynamic behaviours like hysteresis. In this paper a novel two axes micro-positioning stage introduces micron level accuracy; compact design and attractive economic solution is presented. The main goal is to combine the ability to create precise motion over a range of (5×5 mm) with micro-scale accuracy. It is based on two shape memory alloy (SMA) actuators and eight strain gauges as feedback elements. Fuzzy incremental controller is utilized for precise motion control. Experimental results show the ability of control system to satisfy a robust and stable performance which is suitable for micro-positioning applications with low operating frequencies.


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