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My project 2DOF

Discussion in 'DIY Motion Simulator Projects' started by Arielnac, May 19, 2019.

  1. Arielnac

    Arielnac Member

    Joined:
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    Location:
    Argentina
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    My Motion Simulator:
    2DOF
    Hello I am Ariel from Argentina. This is the beginning of my project in which I am acquiring the components to start the assembly.
    The electronics will be in charge of an ADUINO UNO R3 and 2 bridges BTS7960.
    I chose 2 engines of 250W at 75 RPM that are coniguen in China which are designed to motorize wheelchairs. Also buy 2 sensors hall 0-5V to 360º without stop in the rotation in replacement of lso potentiometers of 10K.
    For the connection of the motor shaft with the hall sensors I will use 2 aluminum GT2 pulleys in a 40-20 ratio with GT2 belts of 6mm width and 200mm length. In the beginning the structure will be made of wood.
    When you receive all the articles, I will start to try and upload new features of the project.
    For the moment I leave the links of the sites where I purchased the products.

    https://articulo.mercadolibre.com.a...driver-motores-bts7960-43a-dc-paso-a-paso-_JM

    https://articulo.mercadolibre.com.ar/MLA-627584463-arduino-uno-r3-dip-placa-_JM

    https://es.aliexpress.com/item/250-...090.html?spm=a2g0s.9042311.0.0.2e1463c0TU9sLS

    https://es.aliexpress.com/item/Full...989.html?spm=a2g0s.9042311.0.0.2e1463c0TU9sLS
    • Friendly Friendly x 1
    Last edited: Jul 3, 2019
  2. Arielnac

    Arielnac Member

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    My Motion Simulator:
    2DOF
    Hi. As a novelty today I received these power supply that I got in my country at an excellent price. There are 2 new ones unused. I think they are the best sources that can be obtained. Pay for the 2 power supply U$S 100. The reference price is U$S 190 each.

    Attached Files:

  3. Arielnac

    Arielnac Member

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    My Motion Simulator:
    2DOF

    Attached Files:

  4. BrazilianGuy

    BrazilianGuy eternal apprentice

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    Hi Ariel. I am interested to see your progress. As we are using the same motors, it will be nice to share the experince. I could not find other people trying this wheelchair motors here in the forum.

    Best luck on your build and greetings to the south americans here!
  5. Arielnac

    Arielnac Member

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    My Motion Simulator:
    2DOF
    Yes, these engines are perfect. Although I think I should be thinking about using a sabertooth 2x32 because as I discuss the IBT-2 I do not think they will work
  6. Arielnac

    Arielnac Member

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    My Motion Simulator:
    2DOF
  7. Antsu75

    Antsu75 New Member Gold Contributor

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    Hello! Nice project! Im very interesed about those motors. Looking forward to see your progress. Btw Im using cheap IBT-2 with arduino uno on my sim and they seems to work fine. I had no problem at all.
  8. Arielnac

    Arielnac Member

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    Hi. I still have to do more tests with the IBT-2. Normally when using them with 12V there are no problems. But when using 24V, the feedback voltage of the motors exceeds the working voltage of the IBT-2 and burns them. The solution is to place batteries in parallel to the power supply to stabilize the voltage. I'm in that testing stage
  9. iLLuac4

    iLLuac4 New Member

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    2DOF
    Hi. Where have you bought the U-joint?
  10. iLLuac4

    iLLuac4 New Member

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    2DOF
  11. iLLuac4

    iLLuac4 New Member

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    Also can a diode and which be used to protect IBT-2? Schottky diode maybee?
  12. Antsu75

    Antsu75 New Member Gold Contributor

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    Are you using fans for those ibt-2. Pc fans cool them down quite good
  13. Arielnac

    Arielnac Member

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    2DOF
    • Informative Informative x 1
    Last edited: Aug 15, 2019
  14. Arielnac

    Arielnac Member

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    My Motion Simulator:
    2DOF
    News: Here is a video of a test with SMC3 with the hall sensor mounted on the shaft. During this test the feedback problems disappeared. Probably I was demanding the engine too much during the previous tests with the hall sensor not coupled to the shaft .. Next test with simtools
    • Like Like x 1
  15. Arielnac

    Arielnac Member

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    2DOF
    From what I see in the video, from that resistor comes the positive connector for the 2 fans
  16. iLLuac4

    iLLuac4 New Member

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    I doubt. I think it is used to eliminate coil noise.
    But I can also see two diodes on + and - on power supply. This are used for to protect power supply but I really doubt that they are needed because IBT-2 would be burned first.

    Also would someone know if it would help to put two diodes on each motor to prevent back current flow and burning IBT-2 or would it create latency?
  17. iLLuac4

    iLLuac4 New Member

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    My Motion Simulator:
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    Hi. How are the motors working? Have you already tried them with the load?
  18. Arielnac

    Arielnac Member

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    Hi. Not yet. But they are very promising in terms of power and torque. Also the axis does not have slack.
  19. iLLuac4

    iLLuac4 New Member

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    2DOF
    Hi. There are two tapes of motors with auto brake and without. The one you have is without. What does that mean for the simulator. Worm like motors have usually autolocking mechanism.
  20. iLLuac4

    iLLuac4 New Member

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    My Motion Simulator:
    2DOF
    The specs for those motors are:
    Rated power : 250 W
    Voltage : 24 V
    No-load current : ≤ 4.0 A
    No-load speed : 75 / 120 RPM
    Rated torque : 0.64 / 0.98 N·m
    Rated speed : 2400 / 3700 RPM
    Rated current : ≤13.7 / 14.8 A
    Motor efficiency : ≥ 70 / 76 %
    Working system : S2 : 60
    Insulation class : E
    Reduction ratio : 37.98 : 1
    Adaptation range : Wheelchair motor

    I wonder if 120rpm will be better than 75RPM?