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SMA sensorless actuators for micrometric control | IEEE Conference Publication | IEEE Xplore

SMA sensorless actuators for micrometric control


Abstract:

The ability of SMAs to respond reversibly to an external stimulus by modifying their dimensions can be used to generate motion or force in electromechanical devices and m...Show More

Abstract:

The ability of SMAs to respond reversibly to an external stimulus by modifying their dimensions can be used to generate motion or force in electromechanical devices and micro-machines. There are several works that demonstrate SMAs are serious alternatives as micrometric actuators, obtaining accuracies around 3 μm in position control if high-quality position sensors, such as LVDTs, are used to feedback position readings in the control loop. In this work, a SMA based actuator prototype has been developed, and so that it could be used in light-weight applications, the LVDT sensor used in previous works had to be replaced with a lighter alternative. Once several possible alternatives were analyzed, the possibility of using the wire's resistance as position sensor was chosen, that is, a sensorless control strategy was implemented. The experimental results show that it is possible to obtain accuracies around 60 μm, with the great advantage that the actuator could be reduced to a single SMA element without an additional sensor, question of great importance if the main goal is to reduce the overall weight, size and cost of the actuator.
Date of Conference: 23-26 August 2009
Date Added to IEEE Xplore: 02 April 2015
Print ISBN:978-3-9524173-9-3
Conference Location: Budapest, Hungary

References

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