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https://www.youtube.com/watch?v=g8Je93soOZE

i am interseted in how they achieve compilance and detect collision in servo without the use of sensors. so any one please explain briefly

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  • $\begingroup$ those are servos moving the links ... the servos are controlled programmatically $\endgroup$
    – jsotola
    Sep 6, 2021 at 15:09
  • $\begingroup$ please ask a specific question $\endgroup$
    – jsotola
    Sep 6, 2021 at 15:09
  • $\begingroup$ my question is , how do they achieve compliance and detect collision in that servos without any sensors? $\endgroup$ Sep 7, 2021 at 13:13
  • $\begingroup$ watch the video again ... sensors are being used $\endgroup$
    – jsotola
    Sep 7, 2021 at 14:36
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    $\begingroup$ furthermore searching, I found that ,it is dynamixel servo which has current feedback system, which helps to calculate torque output of servo . i think that , from that torque output graph , any collision is detected when an unexpected/sudden rise or fall in torque in the torque vs time graph and the servos are stopped in their position . Is this correct? $\endgroup$ Sep 8, 2021 at 11:25

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It's explained on the video description:

In this research, a methodology for sensor-less full body active compliance was used on a 6-DOF RSS (Rotary-Spherical-Spherical) parallel manipulator. The manipulator can detect and comply with the external forces on any part of its body without using any explicit force/torque sensor at the joint or the end-effector. This was done by utilizing the estimated joint torque based actuator current feedback only. A three-layer cascaded impedance controller for active compliance and reaction to various human interactions was used. The proposed design and unique methodology for compliance exhibits an effective and inexpensive yet reliable alternative to be used in safe human-robot interactions and force controlled manufacturing applications.

Collision / Compliant motion is detected by the current draw increase of the motor.

This was done by utilizing the estimated joint torque based actuator current feedback only

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