Abstract:
Shape Memory Alloy (SMA) spring actuator was
designed and fabricated using commercially available NiTiNOL
material by shape setting with the use of a special fixture. So,
before applying the actuator to an application, a force
characterization was conducted and force variation respect to
uncontrolled temperature was analyzed. Due to the difference
between force and temperature sensor’s response time, a lag can
occur between force and temperature measurements. Therefore, a
more controlled technique was further implemented by developing
a Proportional-Integral-Derivative (PID) based closed loop
controller, together with a Graphical User Interface (GUI) which
supports parameter control and sensor calibration. Finally, a force
feedback controlling method also developed using the same PID
technique for a force sensitive applications, where controlled
forces need to be maintained by varying temperature of SMA
accordingly.