APM problem, motors do not respond as expected

Posted by Ricardo Bobadilla on September 3, 2015 at 8:51am

Hello

I'm assembling a quadcopter using APM 2.6, I have everything connected properly, I have calibrated the ESC one by one, and setup the APM using the wizard on mission planner, also I tested the motors one by one and everything looks to be fine, however when I try to make some test (without propellers) the following occurs:

When I move up the throttle, the engines start to turn correctly, but after a few seconds one of them stops and the other ones begin to speed up almost to the maximum and I cannot figure out what's going on.


Please, any comments or suggestions will be  very helpful

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Replies

  • Bernardo September 3, 2015 at 9:20am

    Hi,

    without props the motors spin faster and in your test, the copter is trying to **stabilize**.

    That is what you notice with the higher and higher rotating motors.

    Just another test: Switch (without props!) from Stabilize to AltHold. You will hear how the motors calm down.

    Saludos  :)

    • Ricardo Bobadilla > Bernardo September 3, 2015 at 8:54pm

      Thanks Bernardo, I'm going to try in Alt Hold, but the rare thing is that only 3 or 2 motors are those that get higher rotational speed..

    • Bernardo > Ricardo Bobadilla September 4, 2015 at 1:05am

      Those are the motors that receive more input from the *command* to stabilize (horizontal)

      Try this too: take the copter in the hand with lets say 30% throttle and tilt it to

      roll and pitch directions. You'll notice that the fc will send commands to the motors

      to level the copter again. (w. no props!)

      To work right, this suppose that the accel calibration is done.

      If this works, try to make the auto trim calibration outside w. props. in stabilize mode.

      The details and instruction are in the Wiki.

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