Abstract
In order to reliably perform the function of a smart robot that is developing as a collaborative robot, a precise sensor for sensing external load is required. The torque sensor is a important component that is installed on the joints of the robot to detect and measure the load applied to the arm of each part. In this paper, a low profile torque sensor was designed and the output of the bridge circuit was predicted through strain analysis. Strain analysis was performed and evaluated using the theoretical equation of the beam and finite element analysis. The sensing structural element was designed based on the condition that the rated output of a torque sensor with a maximum torque of 50 N.m is 0.5 mV/V. The normal strain obtained by finite element analysis was calculated to be approximately 35% smaller than that obtained by the beam theory. In the case of short lengths such as the torque sensor of this paper, the shear strain calculated as the average strain throughout the cross section agrees well with the finite element analysis result within 2.63%.
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