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Discussion in 'Sensors and Actuators' started by pavankukkala, Nov 9, 2015.

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  1. pavankukkala


    Mar 25, 2014
    Hi ,
    Why servo motor rotates only 180 degrees and stepper motors only 360 degrees?
  2. Martaine2005


    May 12, 2015
    They don't. Servo motors by definition are motors. The servo itself might have a stop or limit.
    As for why steppers or any motor ONLY rotate 360 degrees is beyond me!
  3. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    Servo motors are actually a box with a shaft at one end. The shaft connected to a gear box and the gearbox is connected to a 3-pole motor. You connect an arm (or lever) to the shaft. The arm then pushes or pulls to activate something via a rod. The arm does not rotate fully one complete revolution because it does not have to. The arm only has to rotate half a revolution to create push-pull on the rod. That's why it rotates a little more than half a revolution.
    A stepper motors goes around and around and around. But you make it go around by sending a pulse that only increases the rotation by a few degrees. You have to keep sending pulses to eventually make it rotate a complete a revolution.
    CDRIVE and KeithM like this.
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