I am designing a pan-tilt system. For pan system, we required overall tracking accuracy of 0.1° for given speed profile below. (Max tracking rate: 2 degree/sec, max acceleration: 0.15°/sec² and max torque is 0.0045 Nm.)enter image description here

Initially I tried with stepper motor with 30:1 gear ratio in close loop PID control with external optical encoder (10000 ppr), but this did not work. The motion was not smooth at all and error were sometimes large, as shown below

enter image description here

Large error with pid control

Also PID is not recommended for stepper motorsforum discussion link So now I am looking for alternatives. I was looking into servo or DC motor with external encoder but I am not sure whether I will get accuracy and smooth movement or not.

  • What are the other options do I have?
  • What approach should I adapt now?
  • Will PID be enough for this application?

[OLD QUESTION] My tracking application required an accuracy of better than 0.1 deg for low speed operation (2 deg/sec) and peak torque around 0.00 4Nm. Range of rotation is 0 to 360 deg. Can anyone suggest the kind of motor and motor drivers should I use?

  • \$\begingroup\$ Use some gearing... think about how lathes machine screw threads... \$\endgroup\$ – Solar Mike Feb 4 at 11:14
  • \$\begingroup\$ Your specs must include acceleration , velocity and position tolerances and if load is linear or pulsed or ? With test criteria \$\endgroup\$ – Sunnyskyguy EE75 Feb 4 at 12:53
  • \$\begingroup\$ What is your skill level, budget and preferred interface? Digital or analog? servo or stepper? \$\endgroup\$ – Sunnyskyguy EE75 Feb 4 at 14:07
  • \$\begingroup\$ The OP is asking about what kind of motor to use, not for specific products or places to purchase them. I can see putting the question on hold as too broad, or being subject to opinion, but not for the reason stated. \$\endgroup\$ – TimWescott Feb 4 at 18:27
  • \$\begingroup\$ @ sunnyskyguy EE75 the overall poiniting accuracy required is 0.1 deg, even with acceleration of 0.15deg/sec^2 and 2deg/sec speed. \$\endgroup\$ – Creative Feb 5 at 7:44

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