Design and construction of a servomechanism using a memory alloy linear actuator

This work shows the design and construction of a servomechanism of a rotator-type joint based on NiTi Shape Memory Alloys (SMA) with an angular position measurement based on a potentiometer sensor and digital electronic position control. The expected application of this prototype is for the use of small charges that emulate the movement of the human being, being bio-inspired and activated by artificial muscles, their potential applications they will be in medical and humanoid robotics. Computer Aided Design (CAD) allows evaluating and validating the most convenient parameters for construction of servomechanism, experimental results validate allowed us to obtain the values of the range of motion <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>±</mml:mo> <mml:mspace></mml:mspace> <mml:mn>20</mml:mn> <mml:mo>°</mml:mo></mml:mrow> </mml:math> and a maximum torque of 1.01 kg-cm exerted on the axis of rotation for the prototype.