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  1. #1

    Join Date
    Dec 2005
    Ballwin, MO
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    Testing Servos - Will I Damage them??

    Hey Guys - I was going to do a little servo testing. I was going to set them up on a stand and see what kind of torque they have. So I was going to put on a 1" arm and put on 120oz (for a 120oz/in servo) and see if they have the power they state

    If I stall them out will this damage them?


  2. #2
    Lnewqban's Avatar
    Join Date
    Apr 2007
    South Florida

    RE: Testing Servos - Will I Damage them??

    For a valid test, remember that the arm must be perpendicular to the load all the time.
    Once the arm starts rising up, the lever decreases and the torque imposed to the servo by the very same load decreases as well.

    I believe that the max torque happens close to the stall condition, for which the amps flowing throught the motor and electronic components is max (about 0.6 amps for standard servos).

    IMO, a brief test cannot harm the servo, since it is just like a stall situation, which may happen anytime in regular use (due to excesive airspeed, linkage friction, wrong geometry, etc.)
    Lnewqban - "God will not look you over for medals, degrees or diplomas, but for scars. He has achieved success who has worked well, laughed often, and loved much." - Elbert Hubbard

  3. #3

    Join Date
    Dec 2006
    Fort Worth, TX

    RE: Testing Servos - Will I Damage them??

    Just don't jerk the load and you'll be fine. That's what they servos are made to do.
    No kid, I said break ground and fly into the wind!

  4. #4

    Join Date
    Dec 2001

    RE: Testing Servos - Will I Damage them??

    As long as you do not stall the servo there should be no damage. However, if stalled, the back EMF (the force that limits the current) falls to zero and then the current is limited only by the resistance of the wire which may allow enough current to flow to ruin the servo.

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