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Motor - plus and minus

Discussion in 'Motor actuators and drivers' started by irayspot, Jan 30, 2025.

  1. irayspot

    irayspot New Member

    Joined:
    Jan 6, 2025
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    16
    Occupation:
    mecanic
    Location:
    Canada
    Balance:
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    +0 / 0 / -0
    My Motion Simulator:
    AC motor
    Hello everybody!
    I am Ray, from Quebec, Canada.

    Before I start to build anything, I need to find some motor.
    Steel and electronic fro rig, and sim accessories are available and are less of a problem for me.
    I search to find 3 or 4 identical motor, but this is a chalenge.

    I found this post, DC motors shopping list.
    I want to know more about the motor themself.

    Ex: What are the limits of a wiper motor?
    What kind of power do they provide?

    The infos on motor are not always available, or, comparable.

    Her is my shopping list:

    I can only find "dump truck roll tarp" motor locally.
    They are 600w and 900w (output power?), seem a little to mush.
    I am asking myself, What kind of power do they need?
    I would probably have a hard time finding big enough power supply.
    And, one wall outlet would't probably suffise.
    And, they are sold new with a commercial price tag (300 to 400$ ca).

    I can order Crab pot style motor, same as D Max, from eBay at (200$ ca).
    They are 200 watt.
    They seem to have a good response.
    They function with battery power or server power supply.

    I can find some wheel chair motor on Ebay and Amazon.
    But I am not sure about those, i mean will they last?
    Are they sturdy, there ok to go in one direction.
    But are the gear ok with back and forward mouvement.
    There are for sure the less expensive, 50$ to 100$ca).

    Then, there is the Chinese motor manufacturer on Alibaba (100$ ca).
    Is that safe for transaction?
    Anyone, have experience, ordering from Alibaba?
    They are affordable and they have a lot.


    Can you give me, share, your thoughts.
  2. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
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    Innovative tech specialist for NGOs
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    Balance:
    150,025Coins
    Ratings:
    +10,993 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    Rig design greatly affects motor choice, so what is it you plan to build?
  3. irayspot

    irayspot New Member

    Joined:
    Jan 6, 2025
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    16
    Occupation:
    mecanic
    Location:
    Canada
    Balance:
    123Coins
    Ratings:
    +0 / 0 / -0
    My Motion Simulator:
    AC motor
    Something simple ans lite.
    I give your rig and D Max's as a exemple.
    I like the Dof reality H3 set-up.
    I don't want the rig to take to mush space.
    I would start with 3 motors, not to complicate thing to mush.
    That would make tilt, role and yaw.
    I would use steel tube for the frame.
    I am near 200 pounds.

    But I want the motor to have enough power.
    I see myself building a more complex setup if this one is a success.
    I want to be able to re-use those motor, so it would help to have ample power.
  4. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
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    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    150,025Coins
    Ratings:
    +10,993 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    The smaller the distance between the pivot and the motors the greater the torque requirement of the motors.

    Have a play with SimCalc to get your head around the tradeoff between design Vs physics: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/

    Best to find and follow what others have used in the design type you are looking at, which sounds like knee mount design.
  5. irayspot

    irayspot New Member

    Joined:
    Jan 6, 2025
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    Occupation:
    mecanic
    Location:
    Canada
    Balance:
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    Ratings:
    +0 / 0 / -0
    My Motion Simulator:
    AC motor
    Ok, I will try that. but I am kind of scare to loose time learning new software, to get a simple answer.
    I feel like I need a doctorate to find the Pitagore equation.
    Or maybe I am just lazy.
    Ho yes, I will need a PC for that, time to go shopping.


    ?? Is it not easier for the motor to lift 100 kg at the end of the pivot arm.
    If that same arm is 2 in rather then 12 in?
  6. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

    Joined:
    Jul 13, 2014
    Messages:
    21,395
    Occupation:
    Innovative tech specialist for NGOs
    Location:
    St Helens, Tasmania, Australia
    Balance:
    150,025Coins
    Ratings:
    +10,993 / 54 / -2
    My Motion Simulator:
    3DOF, DC motor, JRK
    You can check out the mathematical assumptions behind SimCalc here: https://www.xsimulator.net/community/threads/simcalc-by-tim-mcguire.11277/page-2#post-140469

    Yes moving a lever pivot closer provides more torque capacity, but the long side of the lever has to move over a far greater distance to do so. It is a tradeoff between design Vs physics.
  7. irayspot

    irayspot New Member

    Joined:
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    Messages:
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    Occupation:
    mecanic
    Location:
    Canada
    Balance:
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    Ratings:
    +0 / 0 / -0
    My Motion Simulator:
    AC motor
    Ok, now I understand. You meant the pivot off the frame or seat. I tough you were taking the pivot arm box pivot. In other words, I tough you meant the smaller the CTC the greater the torque requirement of the motors. And I could not make any sens of that.


    Sorry I doubted you, master noorbeast !