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motors for 2dof

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by absyfadhel1, Apr 30, 2020.

  1. absyfadhel1

    absyfadhel1 Member

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    Hi....i bought more than 4 car wiper motor but it cant take weight...so i decide to search and buy gear motor so is this motor can take about 140 to 200kg?!...

    https://m.alibaba.com/product/62357...spm=a2706.amp_ws_detail.contact#click:btn-buy


    12v
    200w
    120rpm

    help please ASAP.
  2. Ads Master

    Ads Master

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  3. Takumivs

    Takumivs Project CPT

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    Most of these gear motor are used on convey belts machine. looks for manufactures that supply them in your area
  4. absyfadhel1

    absyfadhel1 Member

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    there is no manufactures in my area ...please can you answer...is this motor good and can take weight
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    My Motion Simulator:
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    The motor needed depends on the design and desired performance, so use SimCalc to get your head around design Vs physics Vs performance: https://www.xsimulator.net/communit...e-linear-speed-and-forces-of-your-design.270/
  6. absyfadhel1

    absyfadhel1 Member

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  7. Takumivs

    Takumivs Project CPT

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    is there no video for the simcal @noorbeast ? most vids i see the peeps explanation not understandable
  8. absyfadhel1

    absyfadhel1 Member

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    JUST PUT YOUR MOTOR POSITION AND SOME LIKE THAT...I WANT TO KNOW WHAT MOTOR SHOULD I GET TO HELP ME...I WANT MOTOR TAKE ABOUT 200KG
  9. Takumivs

    Takumivs Project CPT

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    Did you forget caps on....those motor 25nm with the gearbox can carry upto 350kgs with 25Nm. that depends on the ampts you able to supply for the motors to carry any weight the heavier the rig the more ampts you use
  10. Takumivs

    Takumivs Project CPT

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    what type of rig design are you gonna use the motors on. 2dof, 3dof or 6dof?
  11. absyfadhel1

    absyfadhel1 Member

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    this is my build and i just want any motor to take mor than 200kg i have 12v psu its ok?



    20200430_163802.jpg 20200430_163802.jpg 20200430_163802.jpg

    Attached Files:

  12. Takumivs

    Takumivs Project CPT

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    the positioning of the motors are to far back. those can handle heavy weight its how you position the motors to counter the weight. im using swing gate motors and they handle up to 500kgs
  13. absyfadhel1

    absyfadhel1 Member

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    can i see your build?
  14. Takumivs

    Takumivs Project CPT

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  15. absyfadhel1

    absyfadhel1 Member

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  16. Takumivs

    Takumivs Project CPT

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    automation gate motors are alot stronger look into them as they world wide available. could be your motors doesnt have power and had its days by the looks of it
  17. Takumivs

    Takumivs Project CPT

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    Angle are very important
  18. absyfadhel1

    absyfadhel1 Member

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    i dont have the cost for gate motor but is this gearmotor can make the same?
  19. Takumivs

    Takumivs Project CPT

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    the cost of one those worm gear motors will cover two 12v motors or even 3 if you lucky. gate motor companies supply the internal 12v motors not sure about you. but here in ZA they sell to public
  20. Takumivs

    Takumivs Project CPT

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  21. Babylon_Jim

    Babylon_Jim New Member

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    To the original poster:

    Noorbeast is correct that your motor positioning looks to be poor in the photos. Other people on this forum, and in other locations online, have made seat movers (which your design appears to be) and basic 2DoF sims using wiper motors like you are attempting so they are clearly capable of it if you use them correctly, and they are in good order, but many people seem to move to more powerful motors in the end.
    NoorBeast correctly points you to a tool that tells you what % of efficiency the position will provide to help you understand why they might not be working, but looking at your photos a bit more I think that you might not be as far off as the photos make it look. So I have some questions

    • At the moment do you have the two push rods at 90° to a line drawn from from the centre of the pivot point when looking from the side?
    • It looks like you have the rods at 90° to the levers on you motors when they are at rest, can you confirm that?
    See the diagram I attached.

    If the line the pushrods are pushing through is 90° to the a line from the pivot of the seat then that is the most efficient that the motor can be, if it is over or under 90° then you are losing a % of the force that the motor can apply; but also note that this is also true when looking down at the top of your sim rig, the push rods should be aligned to point in towards the pivot point.

    To work out if a motor will lift a load you need to know the amount of force it can output (from the motor data or testing) and then you divide it by the length of the lever you are using.
    For example:
    if you had a 3Nm motor it can apply 3N of force with a lever of 1 meter (3Nm / 1 m = 3N)
    If you halved the length of the lever to 0.5m you get 6N (3Nm / 0.5m = 6Nm)
    if you then halved it again you get 12N (3Nm / 0.25m)

    in your example the lever of the motor seems to be about 100mm (0.1m) long so if your motor puts out 3Nm (I have no idea if your motors output this or not I just picked a random number as an example) you would get 30N at the end of the lever.
    1 N of force (in earth gravity (9.81G)) can lift 0.10197Kg (1N/9.81 = ~100g) so a 3Nm motor output through your lever length would lift 3000g or 3Kg of direct load.
    Remember though that you need to place your pivot point so that the sim is pretty close to balanced anyway so the force of your motor doesn't have to lift your entire rigs weight, it just has to move it and deal with inertia etc.

    A separate question about your design
    • Can you confirm if that is a driveshaft CV joint or a Tripoid joint that you are using as the pivot point (niether of these love being compressed whist pivoting as they are meant to transmit twisting force whilst they are supported in a car hub or gearbox). Ideally that joint would be a universal jount, but if it moves freely whilst you are sitting in it then it should work I guess, you might be losing some of your motor force to overcoming the pivot joint though.
    Although the above doesn't directly answer your question of whether the motor you have found will do what you want, it does provide some information to figure it out.
    Remember that no one, on any forum, knows what your rig weighs, whether it is balanced around the pivot, and what the dimensions are so they can't answer the question directly for you, you will have to do some calculations or find someone to help with them if that isn't your thing.

    What I can say is that using ALL CAPS on a furum is concidered the equivalent of shouting at someone, and most people won't help someone who shouts at them (especially if it is for free).

    Hope some of the above is useful

    TL:DR = Do some maths on the motor to see what it will lift and then some more maths (triganometry etc.) to see if it works in your rig <- it is your rig no one elses.

    Attached Files: