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_Gus's 6DOF Project

Discussion in 'DIY Motion Simulator Projects' started by _Gus, Jul 19, 2019.

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  1. _Gus

    _Gus Member Gold Contributor

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    I apologize if I’m just being stupid, but they should work fine, shouldn’t they? Brushless is more efficient, has a longer lifespan, and can still be controlled with the 2x32 board?
  2. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    No.
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  3. _Gus

    _Gus Member Gold Contributor

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    Well shit. I guess it’s back to the drawing board.
  4. BM114

    BM114 New Member

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    Brushless requires a specialized driver. I believe it is driven via a trapezoidal waveform instead of a plain 'line's dc like a brushed motor is. Best of luck.
  5. _Gus

    _Gus Member Gold Contributor

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    SeatTime, thank you for catching this! I think that you've actually saved me ~$700, as I returned to look for a 600W brushed DC motor, and I've found a great deal. I contacted the seller of this motor, and while I've yet you receive the exact specs on the motor, they quoted me $115 for a motor/gearbox pair, which is less than half of what I was planning on spending on the brushless motors.
  6. BM114

    BM114 New Member

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    I noticed they do a 10 piece minimum. Are they going to give you the same price for only 6 motors?
  7. _Gus

    _Gus Member Gold Contributor

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    Yes. I’ve been chatting with the supplier and I asked for a “sample” of six motors, which they said would be fine. They will be the same price.
  8. BM114

    BM114 New Member

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    Sounds like a good deal. I noticed the motor specs 40A @24v which I assume is a peak of 960watt. Do you already have a power supply in mind?

    I look forward to seeing the progress. I may have to change to these motors myself if they are truly 700w.
  9. _Gus

    _Gus Member Gold Contributor

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    While that listing gives the specs for the 700w output motors (~80% efficiency), I contacted the seller and am going to purchase their 600w output motors, which have -750w input, so they’ll work with my current sabertooth controllers which saves me a lot.

    Beware though, while the motors are cheap, they are big! I was told for 6 motor/gearbox pairs it would be ~100kg, and so I’m going to be paying about $850 in shipping.
  10. BM114

    BM114 New Member

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    That would bring it to about $261 per motor?
    That's still pretty good.
  11. _Gus

    _Gus Member Gold Contributor

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    Quick update:

    I've ordered everything I planned to, and everything should be here in a couple of weeks (chinese motor company quoted me delivery in 3 weeks, but I don't have a tracking number yet). So far I've spent another $2400, and I expect to spend about another $150 on metal and wood.

    Because these motors will have about nine times as much torque as the current ones, I'm fairly sure that if I just bolted them into the current frame it would just rip it apart. To fix this, I'm going to pick up six 12"x8"x1/4" steel plates tomorrow so that I can make far stronger mounts for the motors. So that the lever arm doesn't hit the steel, I'm going to mill/cut out a rectangle for the lever arm and connecting rod to move through. This should greatly increase the area over which the motors are applying force to the bottom frame, and should also fix the minor movements I was seeing in the current wooden blocks the motors are mounted to.
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  12. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    DC motor, Motion platform, 6DOF
    Often hard to know what the specs actually mean for a Chinese produced motor, hopefully the 40amp motors will not overload your sabertooths 2 x 32. Often specs can be a bit confusing, especially when the items are coming from China. As a example, images below are four motors that I testing out for my 6DOF many years ago (just initially purchased one of each). The larger one is a industrial grade motor rated at 200W and the three smaller ones are commercial grade motors rated at 350 W. Hope it all goes well for you.

    Actuator standard against bigger motor.jpg Actuator with motor_gearbox attached.jpg DSC02337.JPG New Motors.jpg
  13. _Gus

    _Gus Member Gold Contributor

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    The reason the motor there could be rated at 700w, is because the output is 700 watts, and the motor itself is somewhat inefficient, usually only 70-80% efficient, which means they need more than 700w to output 700w.

    Also, the motors I purchased have a 600w output, and an input of just under 750w (24v, 31.25a) which means they shouldn’t be able to overload my 2x32s.