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Questions about 80ST Servo Motors amperage draw

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by Moe Colontonio, Dec 23, 2025 at 19:52.

  1. Moe Colontonio

    Moe Colontonio Member Gold Contributor

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    My Motion Simulator:
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    I'm getting ready to build another SFX100 based 4dof rig using 80ST servo motors. I'll have 4 motors for roll/pitch/heave, and a 5th motor for traction loss. I'll also have 2x 80ST for the belt tensioner for a total of 7x 80ST motors.

    I can run them on 240v or 110v, it really doesn't matter all that much to me as the sim will be in a hangar with both 30a/240v and 20a/110v available.

    I'm trying to get a straight answer on amperage draw. I'm reading 3a per motor, but I've also seen 9a. My current rig uses 4x 110ST and 1x 80ST on a 30a/240v line with no issues.

    I'm purchasing the belt tensioner from E-Racing Labs, and they advised me to just run it all on a 20a 110v line. Just seems like a lot of motors on a single 20a outlet. Does the Thanos controller offer some kind of protection for low voltage/high amperage draw events?

    TIA
    Moe Colontonio, Dec 23, 2025 at 19:52
    #1
  2. Misanthrop

    Misanthrop Active Member

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    You will have no issues with both solutions.
    Misanthrop, Dec 24, 2025 at 07:35
    #2
  3. Joe Cortexian

    Joe Cortexian Active Member Gold Contributor

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    If you have a choice the 220w is safer. 120v 20amp is only 4400w total vs 7200w. I think “it doesn’t matter” is bad advice. Wouldn’t you prefer the I have too much power problem?

    I am running a single 750w servo (drift) off an 800w step up transformer. Very occasionally I get a buss under-voltage alarm which means I have to re-power the amp. I can adjust parameters to get around it but the step up transformer is temporary until I install a 240v breaker.
    Joe Cortexian, Dec 25, 2025 at 17:35
    #3