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F1 like 3DOF Simulator with heave

Discussion in 'DIY Motion Simulator Projects' started by _cOdaC_, Jun 25, 2024.

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  1. _cOdaC_

    _cOdaC_ New Member

    Joined:
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    My Motion Simulator:
    3DOF, DC motor, Arduino
    @noorbeast , yes I'm gonna add some resistors as well.
    Do you know what cable size I need for the resistors?

    I found the solution to my issue with the motor not moving. It was the Pot (I have a 360) standing in the wrong position. The motor was shut down to that reason and Motor 1 was "OFF". After moving the pot (green line) a bit down (underneath the blue line) I could swith the Motor1 back "ON" and continue testing.
    _cOdaC_, Aug 23, 2024
    #21
  2. Sebastian2

    Sebastian2 Member Gold Contributor

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    Depends on the lenght. My cables to the load resistors are about 10...20 cm long and I think I use 2,5 mm^2 (about AWG14).

    No need to use the same cross section as for the motors, as energy dissipation is the whole point of the load resistors. Take a look at the diameter of the resistor terminals - no need to get bigger than that, as handling thick wires can be tricky.
    • Like Like x 1
    Sebastian2, Aug 23, 2024
    #22
  3. _cOdaC_

    _cOdaC_ New Member

    Joined:
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    Balance:
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    My Motion Simulator:
    3DOF, DC motor, Arduino
    Coming back to your post, I'm a bit lost with the numbers.
    The calculator says:
    "Use your motor's max output current or the power output's max current, whichever is less."
    The Sabertoth manual says: "The resistor’s value should be calculated to
    provide the typical motor current or 8 amps, whichever is
    less."

    I'm using two Sabertooth 2x32, one with one motor attached, one with two motors attached.
    One motor PSU:
    1000W, 24V, 41.6A
    Two motors PSU:
    2000W, 24V, 83,3A

    Motor specs (per motor):
    500W, 24V, 20.8A

    So the motors max output current is 41,6 and 83,3 Amps.
    The mentioned 8 amps is way less...

    I guess "Max Battery Voltage" at the calculator are the 24V.
    What do I put into the max current field?
    _cOdaC_, Sep 9, 2024 at 17:00
    #23
  4. Sebastian2

    Sebastian2 Member Gold Contributor

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    In your case you need to enter 8 Ampere.

    You are right about 24 V being the Voltage.
    Sebastian2, Sep 9, 2024 at 17:21
    #24
  5. _cOdaC_

    _cOdaC_ New Member

    Joined:
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    My Motion Simulator:
    3DOF, DC motor, Arduino
    The result is 3 Ohms dissipates 192 Watts at 8 Amps.
    I have 6.8Ohm and 100W Resistors.

    So I would set two of them in parallel, to get 3,4Ohms and 200W, right? Do you think thats feasable?
    _cOdaC_, Sep 9, 2024 at 18:50
    #25
  6. Sebastian2

    Sebastian2 Member Gold Contributor

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    Sounds good, although personally i don't have practical experience with sabertooth drivers.

    My own 3DOF with heave with similarly powered motors uses a 100 W load resistor per motor and they don't get hot, so I assume that you are on the safe side going with 200 W.
    Sebastian2, Sep 9, 2024 at 21:25
    #26
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