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Question How to choose motors and improve my 3dof simulator

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by diegocom, Oct 9, 2018.

  1. diegocom

    diegocom New Member

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    Good morning,
    I'm tring to build a 3dof dynamic simulator. I've read a lot of conversation but I have some mess in my head so I have some questions to ask to you.
    In the attached images you can see what I have tought for my design (it's a very basic draw but I maked it to give you an image of my idea and I still have to think where put the 3rd motor for the yaw ).
    My main problem is choose the motors. My idea is to put the two motors for pitch and roll in front but, how much power they need?
    On the web I found a lot of gear motor (or worm motor?) but I have no idea how to choose:
    - Torque (NM)
    - Power (Watt)
    - RPM
    - Supply 12V or 24V (maybe 12V is more compatible with a lot of controller boards?)
    I'm trying to spend less money as possible so I don't want make mistakes to choose my actuators.
    Another think is the controller board, arduino is a good choice? With with motor driver shield? Moto Monster?
    If you have a good tutorial that explain the difference between various motor or how to choose them, recommend it to me!
    Thanks in advance for giving me your experience

    IMAGES:
    ApplicationFrameHost_2018-10-08_23-29-27.png ApplicationFrameHost_2018-10-08_23-30-07.png ApplicationFrameHost_2018-10-08_23-30-15.png ApplicationFrameHost_2018-10-08_23-30-29.png ApplicationFrameHost_2018-10-08_23-30-38.png ApplicationFrameHost_2018-10-08_23-31-02.png ApplicationFrameHost_2018-10-08_23-31-19.png
  2. noorbeast

    noorbeast VR - The Next Generation Staff Member Moderator

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    My Motion Simulator:
    3DOF, DC motor, JRK
  3. diegocom

    diegocom New Member

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    Thanks for your reply, I had already seen that tool but my design it's quite different from that one represented inside SimCalc (my version is SimCalcV0.1_BETA), so I'm not able to understand how to choose motor. For example, this can be a good choice? I have some dubts because the price is low. https://www.ebay.com/itm/WG88BD82-3...5U-min-Kran-Seilwinde-Brauanlage/323492413439
  4. ne02005

    ne02005 Member

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    Just try with wiper motors! I have a frame more heavy than yours and works great. All depends where you put the motors...
  5. micma80

    micma80 Member

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    ITA Ciao Diegocom, i consigli dei posts precedenti sono ottimi. In linea di massima per una struttura come la tua (in ferro e senza supporto monitor), se ben bilanciata rispetto al fulcro, puoi considerare che la coppia necessaria sull'albero lento del motoriduttore sia di circa 10 Nm con 50 g/1'. Questo significa un motoriduttore di circa 60 W di potenza in c.c. (12 o 24 V, è questione di alimentazione e schede ponte H per il comando dei motori; a 24 V la corrente è una metà che a 12 V).
    A queste condizioni vanno bene i motori tergicristallo di camion o autocarri (24V) con un buon alimentatore da 20 A e batteria 24V (12V+12V in serie) per sopperire ai carichi di picco.
    Questa soluzione potrà darti movimenti veloci ma limitati nell'escursione. O viceversa movimenti meno veloci e più ampi.
    Se vuoi qualcosa di più performante devi andare su motoriduttori da 150 W (12 o 24 V 3000 g/1' C 0,4 Nm) con riduttori rapporto 60 (es. NMRV025) e ingranaggi in metallo.
    In ogni caso ti consiglio di impostare bene la staffa motore e mettere un cuscinetto sull'albero in modo da non caricare il peso in modo radiale sul motoriduttore.
    Spero di esserti stato utile,
    a disposizione
    micma

    ENG Hi Diegocom,
    the advice of the previous posts are excellent. In principle for a structure like yours (iron and without monitor support), if well balanced compared to the joint, you can consider that the torque required on the slow shaft of the gearmotor is about 10 Nm with 50 g / 1 '. This means a gearmotor of about 60 W of power in c.c. (12 or 24 V, it is a matter of power supply and H-bridge cards for the control of the motors, at 24 V the current is a half that at 12 V).
    Under these conditions, the windshield wipers of trucks or trucks (24V) with a good 20 A power supply and 24V battery (12V + 12V in series) are suitable to meet peak loads.
    This solution can give you fast but limited movements in the excursion. Or vice versa, less fast and wider movements.
    If you want something more performing you have to go on 150W (12 or 24 V, 3000 rpm T 0,4 Nm) gearmotors with gearboxes ratio 60 (eg NMRV025) and metal gears.
    In any case, I suggest you to set the motor bracket well and put a bearing on the shaft so as not to load the weight radially on the gear motor.
    I hope I was helpful,
    available
    micma