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Showroom 2DOF cheap platform by deeppl

Discussion in 'DIY Motion Simulator Projects' started by Deeppl, Sep 3, 2021.

  1. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    Welcome. After I came to this forum for the first time, I decided that I have to build a 2DOF platform at all costs. However, I did not have any experience in this topic, so the task seemed impossible;).
    However, after watching your projects, reading hundreds of threads about various problems and how to eliminate them, I started my own project.
    First, I bought an Arduino Uno released by Cytron called Maker Uno. It has a bit more goodies than the standard one, so it's interesting.

    main.jpg

    Initially, I decided that 13A of continuous current should be enough for me, so I bought 3pcs H-bridges from Cytron called MD13S for the set.
    cytron-md13s.jpg
    It seems that they work perfectly with Uno with uploaded SMC3 in mode 1.(User manual added)

    I made my first tests on the 12V passenger car wiper motors found in the garage, powered by a cheap LED power supply with only 10A of current. I temporarily used potentiometers from an old computer monitor to control the position.

    20210728_171204.jpg 20210728_171221.jpg 20210728_171159.jpg

    The experiment worked very well, almost. after a few minutes of jerking, the power supply exploded;). I already knew that I had solved problems with electronics and control (which I was very afraid of). Now can spend some money on better engines and power supplies. ;)

    To be continued...
    Regards.

    Attached Files:

    • Like Like x 1
    Last edited: Sep 3, 2021
  2. Ads Master

    Ads Master

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  3. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    Time for power supplies.

    I wanted to use what I already had. I started with a Compaq PS4060 having 25A of current on the 12V line.
    compaq.jpg
    Diagram of switching on the power supply outside the server.
    Compaq PS4060 Pinout.jpg
    I used 2 pcs connected in series to get 24V. It was fine, but the large dimensions and the cruel noise of the windmills were unacceptable. Trash.

    Then I took 2 pcs of Dell NPS 330AB. Smaller, quieter, slightly weaker, only 18A of current at 12V.
    20210903_182123.jpg 20210903_182157.jpg 20210903_185151.jpg

    Diagram of switching on the power supply outside the server.
    DELL.jpg
    Unfortunately, during testing, I damaged one of them. There was only 12V left so I had to look further.

    I started looking for new power supplies.
    I found the Fujitsu DPS-800GB, 66A of current on the 12V line is impressive, especially since you can buy them for about 5 €. ;)
    20210903_182218.jpg 20210903_182229.jpg

    Diagram of switching on the power supply outside the server.
    Fujitsu.png

    Please note that these types of power supplies are grounded on the housing and are connected to the protective conductor in the 230V socket. To use them as a 24V source, it is necessary to separate the ground from the housing. It is simple to make with plastic washers and screws with which the plate is screwed.

    In this way, I used a 24V 66A power supply. This is how I prepared the voltage outputs:
    20210903_182251.jpg 20210903_182312.jpg
    Ultimately, I used 2x 12V 26Ah batteries to protect the power supplies and stabilize the power consumption.
    I added a fuse and a switch that controls the relay so that you can easily turn off the power.

    20210901_194119.jpg

    This is what the power supply looks like. It seems sufficient.
    Each of the three motors can simultaneously download over 20A, which is more than my drivers. ;)

    To be continued...
    Regards.
    • Like Like x 1
    Last edited: Sep 5, 2021
  4. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    I assumed that the motors I need should be about 200-250W and powered from 24V so as not to exceed 13A current, which is due to the limitations of my H bridges. The choice fell on motors from a wheelchair. In fact, these are the only angular geared motors I could find in my area. I chose such that after the gear they had about 100 rpm. The problem was to calculate or estimate the torque on the shaft, I had to risk that they would have the strength to move quickly and steadily.

    Ultimately, I bought two such engines:
    Motors.jpg

    Manufactured by Invacars, model SRG0131
    The parameters are 220W, 3000 / 110rpm, 11A and 24V.

    20210823_140018.jpg

    This is what it looks like with the tonearm, which I prepared 3 holes giving a length of 60, 90, 120 mm from the axis. It seems that it will allow you to control the speed and range of movements.
  5. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    I used such tie rod heads as connectors.
    image640.jpg
    Connected with an M12 threaded rod. It seems quite strong.


    I connected the potentiometers with the motors using such cable connectors;)
    20210817_215913.jpg

    I also purchased a shaft from a Mitsubishi Outlander. It was just in the neighborhood and relatively inexpensive.

    I cut the shaft 25cm long and welded a flat bar 12x12cm 6mm thick. 4 holes and I was ready to mount it.

    I chose steel profiles 40x40x2mm for the frame.
    First, a 6m barbell. We'll see if it's enough.

    For this some M8 and M12 screws.

    All that's left is to prepare the welder and do what I have in mind;)
  6. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    I had the upper frame made a little earlier because I was playing statically in a car seat.
    20210809_174724.jpg
    The top frame is 100cm long and 50cm wide.

    The seat of the Volvo 850 is highly adjustable, comfortable and made of half-leather.
    20210903_153931.jpg

    The steering wheel mount is height-adjustable from the Celica 1983 RWD;)
    20210903_153526.jpg 20210903_153537.jpg

    I had to make some extra mounting for the pedals because before that they were just standing on the ground.
    20210903_153518.jpg
    I made it so that you could adjust the position of the pedals.
  7. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    The lower frame with the motor mounts is 75 cm long and almost 60 cm wide. I tried to make everything as compact as possible. Maybe one day the loss of traction could be added. Fingers crossed.

    Try-ons:
    20210809_174724.jpg 20210809_174724.jpg
    20210809_174745.jpg 20210809_174759.jpg
    20210809_174735.jpg

    The effect after the first day of work;)
    20210814_063518.jpg

    Connector settings:
    20210815_233719.jpg 20210815_233729.jpg 20210815_233744.jpg

    And final performance:
    20210901_194135.jpg 20210901_194156.jpg
    20210903_153456.jpg 20210903_153616.jpg
    Last edited: Sep 12, 2021 at 19:03
  8. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    Preparing electronics:
    20210823_215738.jpg 20210823_215843.jpg 20210824_172131.jpg 20210824_172138.jpg 20210826_165332.jpg 20210901_194110.jpg

    Power supplies:
    20210826_165345.jpg 20210901_194119.jpg

    Motors cooling:
    20210903_171420.jpg 20210903_171427.jpg
  9. Deeppl

    Deeppl Member

    Joined:
    Jul 23, 2021
    Messages:
    39
    Balance:
    - 169Coins
    Ratings:
    +7 / 0 / -0
    My Motion Simulator:
    2DOF, DC motor, Motion platform
    And this is what it all looks like in one piece. In the background you can see how many energy drinks have gone to get it all done.

    20210901_194209.jpg 20210901_194227.jpg 20210903_153946.jpg

    Best regards to everyone and good luck with all your projects.