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  1. #1
    Join Date
    Jan 2004
    Posts
    4

    Question Sizing servo power supply?

    Here are the stats for the servos.

    Rated voltage: 24 VDC
    50 oz-in continuous torque
    410 oz-in peak torque
    No load speed 3,211 rpm
    Torque constant (Kt) = 10 oz-in / amp
    Voltage constant (Ke) = 7.39 volts / krpm

    How large a power supply do I need for this motor? 41 amps seems a bit unrealistic. If I am running 3 of these motors from a single power supply can I reduce the total amperage?

  2. #2
    Join Date
    Mar 2003
    Posts
    779
    Are you sure about the 10 oz/in per amp?? This would mean that each servo is capable of taking 41 AMPs for a short time!

    That just seems to high. Most of the servos in the 300-600 range take 20 amps peak.

    I would question this, but if it's true then you should build at least a 40 amp supply. You will most likely never strain all three servos at the same time when doing a job. If you do a heavy diagnal 2D cut then you have the possibility of two servos wanting to pull higher amps. However if you are using Geckos for drivers, then you will be limited to 20 amps per motor.
    Thanks

    Jeff Davis (HomeCNC)
    http://www.homecnc.info


    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  3. #3
    Join Date
    Jan 2004
    Posts
    66
    I'm guessing that you have Pittman motors, the same type I use.

    A 15A supply will hold the 3 motors well, 20A if you would like some wiggle room.

    That would be constant torque/Amps (5 amps per) * 3 motors.

    If your looking for one I have the 24VDC 15 A in stock, and some 24VDC 20A comming soon.

    I know a lot about these motors, so if you want to email to set up a call that would be fine. I won't try to sell anything

    Thanks
    Aaron Moss

    www.IndustrialHobbies.com

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