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Question my engine loses power

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Pedro Fuhs Benini, Jun 28, 2022.

  1. Pedro Fuhs Benini

    Pedro Fuhs Benini New Member Gold Contributor

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    My Motion Simulator:
    2DOF, DC motor, Arduino
    my motor loses power and falls when i sit on the bench, can someone help me, they are wheelchair motors, 24v/70a source, ibt2 h bridge, arduino uno

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    Last edited by a moderator: Jun 28, 2022
  2. Ads Master

    Ads Master

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  3. Pedro Fuhs Benini

    Pedro Fuhs Benini New Member Gold Contributor

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    My Motion Simulator:
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    It works perfectly, when the weight of the body is placed, it stops working, as if the engine turns off.
  4. SaintFrank

    SaintFrank Member

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    My Motion Simulator:
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    Is the rig balanced with you on it?
    Maybe that would take some load of the motors.

    What is the power (Watts) of the motors?
    Sounds like it draws to much currant( amperage) .
  5. Pedro Fuhs Benini

    Pedro Fuhs Benini New Member Gold Contributor

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    The motors are around 300 watts with a reduction of 32/1 each, I use a 24v 70a source, I put car batteries for testing but it was the same thing, it could be the SMC3 configuration, it works well but suddenly it falls apart
  6. SaintFrank

    SaintFrank Member

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    • Agree Agree x 1
  7. Pedro Fuhs Benini

    Pedro Fuhs Benini New Member Gold Contributor

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    My Motion Simulator:
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    Yes it follows the sinusoid perfectly for a while, at some point I notice as if the motor stops and loses the reference, could it be the ibt2 h bridge heating up? , when the bridge h warms up could it stop sending pwm ? , I'm using b10k potentiometers. I will make a video
  8. SaintFrank

    SaintFrank Member

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    Ibt-2 can handle up to 27V , but if they getting hot that is not a good sign,
    I reduced voltage to my ibt-2 to 21V
    This minimalizes the heat generation , mine are not warm at all.

    I think the potentiometers are not the problem.
    You can check the pots:
    no power to the motors and rotating motor by hand , check their movement in SNC3.

    Maybe change an ibt2 or the arduino see if that makes any difference.
    and meassure the load (amperage) of the motor.
  9. Pedro Fuhs Benini

    Pedro Fuhs Benini New Member Gold Contributor

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    I did a new test, my power supply works at least at 24v, I put a fan on the ibt2 bridges, in the ammeter test it reaches 3 amps and the motor is turned off, in theory the bridges are 43 amps and my supply 70 amps, it shouldn't there is this stop in the engine
  10. wimpo`

    wimpo` Member

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    Could be that the PSU is shutting down because of voltage received from motors when slowing down. This can easily exceed the supply voltage voltage. Some PSU can't handle that well. The bts7960 also doesn't like it much from what I read. A battery can handle this. Maybe the USB cable wich is pretty close to to the PSU lines, emi? Bad ground connection somewhere so could be a ground loop. I don't know exactly what the switch between the PSU line is. Looks like a 230v 16a breaker. Maybe it's faulty. Try to use one moter with the PSU so you know that it isn't the motors back emf that is working against each other. Just my 2 cents.
    • Like Like x 1
  11. nmk

    nmk New Member

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    good morning, it could be the weight of the whole body on top of the motors, the chair needs to be at a well balanced angle, when I did my project the same thing happened, then I changed the angle of the chair so that all body weight would not be on the motor and it worked, I hope could have helped