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Question Help with psu selection

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by 29ford, Feb 27, 2022.

  1. 29ford

    29ford New Member

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    My Motion Simulator:
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    Hey all.

    I have purchased some motors that I hope will be suitable for my rig that I want to start building. They are 24v electric wheel chair motors.
    The have a data sticker that says max Watts 520 .

    My question is would a 20a power supply be enough per motor or would I need some cushion say a 25 or 30a output.
    Any help would be appreciated

    I have attached a photo of the motor plate.

    Attached Files:

    29ford, Feb 27, 2022
    #1
  2. Gadget999

    Gadget999 Well-Known Member

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    My Motion Simulator:
    2DOF, DC motor, Arduino, 6DOF
    The power supply will be subject to regenerative braking and may not like the changes in load

    what i did was very simple - use 2 x 12v batteries to power the motors - then use a smaller 24v power supply to keep the batteries topped up

    I run 6 motors x 800w this way

    a car battery is not expensive and you can buy cheap jump leads to use as high current wires

    the motors look decent - what is the gearbox rating and current ?

    ---------------------------------------------------------------------------------------

    this will help you work out amps
    Gadget999, Feb 28, 2022
    #2
  3. 29ford

    29ford New Member

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    Hi gadget999

    Thanks for your reply that's a good idea. I am a little limited on space in my final location so was hoping to just run psu's but the batteries I will keep in mind. The gearboxes states 1:19.3.
    29ford, Feb 28, 2022
    #3
  4. Gadget999

    Gadget999 Well-Known Member

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    how many motors / DOF are you building ?
    Gadget999, Feb 28, 2022
    #4
  5. 29ford

    29ford New Member

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    2DOF
    Just a 2 DOF at the moment but plan on building it with chances of running a traction loss in the future. But defo 2 Dof at the moment as I only have 2 motors
    29ford, Feb 28, 2022
    #5
  6. bob golding

    bob golding Member Gold Contributor

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    hi, worth looking on ebay. i just got a 3 kw psu for £120. normally these things are several hundred pounds new. i am not sure about the regenerative load. i am going to use h bridges so i think the regenerative load probably dissipated as heat though a blocking diode but have not checked that,.
    bob golding, Mar 12, 2022
    #6
  7. Escartiz

    Escartiz Member

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    My Motion Simulator:
    3DOF, DC motor
    I am using server power supplies, one per motor to lessen the risk of tripping them. I was advised to get plenty of overhead power to cope with the spikes generated. I went with 750w PSU's but you can find even larger like 1000w or more. For me, these turned out to be the least expensive option. You can find them very cheap on ebay. They are 12v each but with a small modification, you can put 2 in serial to generate 24v. I 3d printed caps to cover the exposed connections in the back for safety.
    • Like Like x 1
    Escartiz, Mar 15, 2022
    #7
  8. bob golding

    bob golding Member Gold Contributor

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    thanks, i managed to pick up a 3000 watt meawell one on ebay for a decnt price.
    bob golding, Mar 16, 2022
    #8
  9. 29ford

    29ford New Member

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    Thanks for all the feed back. I've managed to pick up a 1200w 24v psu for now so I will use that for testing and see how I get on from there.
    29ford, Mar 21, 2022
    #9