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Showroom FlyPT - 6DOF Brushless DIY Actuators

Discussion in 'DIY Motion Simulator Projects' started by pmvcda, Aug 29, 2017.

  1. pmvcda

    pmvcda aka FlyPT

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    Covering the sides might reduce noise.
    But it's not as loud as it seems on the video.
    Camera microphone and eco in the garage amplify the sound.

    Rotating actuators are way more silent.
    If you live in an apartment, you might prefer it.
    Also, it can be more compact with some powerful motors.

    Take a look at @Grigory rig, he made the opposite, going from linear to rotating: https://www.xsimulator.net/communit...ct-and-no-linear-actuators-220v-servos.11839/
  2. Gabor Pittner

    Gabor Pittner Active Member Gold Contributor

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    I made a big mistake when i chosed 24V DC motors with sabertooth controllers and worm gearboxes to build a 6dof motion rig. My motors are very powerful 490W (100A peak current), they are very strong really, but not at low speed. I've been struggling more than a half year to set it smooth no succeded. I tried Arduino with SMC3, and I have an AMC1280USB board too, I tried to use gas struts as well. I thought all issues come from backlash, but don't. I realised motors are weak in low speed and they can stuck some milliseconds, that coses extremely jerky platform. So the best is using planetary gears and 220V servos, now I know it, but its very very expensive. I need more than 4000EUR to change motors, gears and controllers, dont want it :)

    But as I see @Grigory used the same 24V DC motors in his second project to linear actuators that he had used his first 6dof rig before. Those transtecno motors are week too in low speed I think. I believe in your stepper motors, they could be strong enough in low speed as well.

    But the key is using servo motors every kind of motion platform to build. Im sure.
  3. Gabor Pittner

    Gabor Pittner Active Member Gold Contributor

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  4. pmvcda

    pmvcda aka FlyPT

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    I have to find the file... I will take a look.
  5. motiondynamics

    motiondynamics New Member

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  6. pmvcda

    pmvcda aka FlyPT

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    Didn't test yet. But I might test it soon.
    Received some gift pcb boards and I will test them with that controller.
    I'm just missing some parts...
    Stay tuned.
  7. motiondynamics

    motiondynamics New Member

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    Ok, we're waiting for information.
    So to test that controller, you will need to disassemble the single-phase motor and insert a 8-wire BLDC motor?
  8. pmvcda

    pmvcda aka FlyPT

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    ? Did you read this thread from the start...
  9. motiondynamics

    motiondynamics New Member

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    Yes, I also saw all the videos and images. In the actuators you have installed the 12v brushed motors (not brushless).
  10. pmvcda

    pmvcda aka FlyPT

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    I think you should read again...
  11. motiondynamics

    motiondynamics New Member

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    Hello Starter PMVCDA, in the meantime I thank you for your technical support and for your answers. Unfortunately I'm Italian, I've already seen 3 times, all 14 pages of posts. I translated your posts, I realized that they are DIY cylinders, aluminum profiles, I saw that you used DC 12V motors, you used Sabertooth, you made 3D components for potentiometers, used screws to recirculate balls. I read everything because of the translation. But I think I understood 90% of things.
    I will wait for you to try the brushless motor controllers, I will be curious to know if those controllers are able to withstand the declared current (15A, 500W).

    I want to ask you something else: if I wanted to use the motors that have the output shaft with different coupling (see figures) which flexible joint (coupler shaft) could I use?

    Attached Files:

  12. pmvcda

    pmvcda aka FlyPT

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    Sorry, but I think you understood 10%...

    I used 24V brushless motors (NANOTEC DB59)
    I don't even speak about a Sabertooth...
    For controller I use the BLDC8015A.
    Started using pot's, but removed them and I use only the internal hall sensor of the BLDC motor for positioning.

    There are couplings of different sizes. So yes you can use them.
    You have there (2nd) a motor with a key. Maybe remove it to use a standard coupling.
    The others are all compatible with current couplings. Maybe not ideal, but they work.
    • Funny Funny x 2
  13. motiondynamics

    motiondynamics New Member

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    Sorry you're right, I had confused with another post that used DC motors. If you use BLDC motors, I hope you can test the economic controller soon. I have some doubts about the reliability of the current (15A) and about the inversion times of the motors, but who knows, maybe everything will work fine. We will wait for your news.
    One question: can flexible joints (with a simple hole) have slipping problems on the motor shaft?