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3x 0.5HP AC motors + gear reducers for 300$?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by lucacockpit, Mar 25, 2020.

  1. lucacockpit

    lucacockpit New Member

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    Hey guys,

    I'm evaluating my options for my motors (3 motors- 3DOF flight sim platform).

    I have been quoted this from China:

    Screenshot 2020-03-25 at 00.46.04.png

    This is gonna sound super naive to some of you probably but I've seen people paying 650$ for 1 motor with similar specs, like this one for example:
    Screenshot 2020-03-25 at 01.16.39.png

    The price I got from China is for 3 motors and 3 gear reducers.

    I'm confused. What am I not getting here?

    Thanks a lot for your input in advance.

    Luca

    PS: They look very similar (identical?) to the ones used for this platform:
    Last edited: Mar 25, 2020
    lucacockpit, Mar 25, 2020
    #1
  2. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Motion platform
    Depends if you want to take the risk? I have seen many people try to get these type of motors working properly and have ended up walking away as the accuracy of movement/noise etc were all issues. You could try ordering one set + controller and see how it goes? There are although proper AC servo solutions out there that are now not that expensive (relatively speaking to what it use to cost in the past) and are known to work great.
    SeatTime, Mar 25, 2020
    #2
  3. zapata_h

    zapata_h Active Member

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    My Motion Simulator:
    3DOF, AC motor, Arduino
    I use 3 AC motors and I have to tell you that it works perfectly
    zapata_h, Mar 25, 2020
    #3
  4. SeatTime

    SeatTime Well-Known Member

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    My Motion Simulator:
    AC motor, Motion platform
    Sure there are AC motors that work fine - as I said above, but from my years of reading on this site, it has been shown that not all AC motors are suitable for use in a simulator. The OP was after some actual feedback for the motors he has shown - are you guaranteeing him that these will work perfectly for his application ?
    SeatTime, Mar 25, 2020
    #4
  5. lucacockpit

    lucacockpit New Member

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    Thanks a lot for your replies. This makes sense to me, but have you seen the video in my post above? I have checked with the manufacturer that quoted me and they said it was the same model except smaller, so I guess I should be good..

    Follow up question I had about AC motors for motion platforms in general, regarding their service factor/duty cycle.

    The motor/gearbox I had in mind has a service factor (sf) of 2.1, with 35RPM and a torque of 70Nm.

    Can anyone tell me if this service factor is a bad, average or good value? It seems to range from 0.8 to 2.6 sf depending on torque and rpm combo but how does that affect the continuous operation time of the motors?

    Thanks a lot, learning day after day here it's super exciting.

    Luca
    lucacockpit, Mar 25, 2020
    #5