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Question Power Supply Oversizing

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Map63Vette, Jan 14, 2021.

  1. Map63Vette

    Map63Vette Member

    Joined:
    May 19, 2016
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    Occupation:
    Mechanical Engineer
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    Lawrence, KS
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    Is there any kind of rule of thumb regarding power supply sizing vs motor draw? I have several wiper motors on hand and I have datasheets with speed, torque, and current values as well as physical testing to back those numbers up. From all the testing and datasheets, the motors stall at ~20A or so. That being said, I assume there would still be some surge current for initial motion and back EMF stuff to deal with. My plan was to run JRKs for motor control and I have two on hand already. I had my eye on some 30A power supplies for ~$20 each, but wasn't sure if this would be enough to handle any surge currents or if it would be overkill.

    As a side note, this pivots around the plan to use a single power supply for each motor, but that could be kind of messy when it comes to wiring as I'd have multiple plugs I'd need to plug in to use the system. Granted I could run everything to a single power strip so I only have one final plug, but not sure if that's a good plan or not. The alternative would be one sizeable power supply that would easily answer my surge current question, but then I would be a bit worried about the potential for a motor to backfeed others or something like that. I would hope the JRKs would deal with that, but wanted to be sure before I pulled the trigger on anything.
    Map63Vette, Jan 14, 2021
    #1
  2. noSaint

    noSaint New Member Gold Contributor

    Joined:
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    My Motion Simulator:
    2DOF, DC motor, Arduino
    You can use a car battery as buffer for high current draw.
    • Agree Agree x 3
    noSaint, Jan 14, 2021
    #2