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How to Calculate Motor Specifications for a Specified Load?

Discussion in 'Motor actuators and drivers' started by Metaverum, Apr 12, 2022.

  1. Metaverum

    Metaverum Member Gold Contributor

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    Hello everyone,

    I wish to build a wormgear-based 3DOF motion platform. I am having difficulty choosing the motor and worm gearbox paremeters. I will have a dynamic load of 600KG. In the attached image is a basic 3DOF platform where the red circles are the positions of the 3 motored gearboxes.

    I used SimCalc but it seems for 2DOF and shoulder-mount, how can I calculate the force required for such a system? How can I calculate motor RPM needed, torque, etc? If there are any formulas around or something I can of course do the rest myself but this is quite confusing.

    Attached Files:

    Metaverum, Apr 12, 2022
    #1
  2. Metaverum

    Metaverum Member Gold Contributor

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    Okay so I did some research and calculations on my own. Once again I'm a total beginner so I'm not sure if this is correct in any way.

    I have a motor of 1200W, 2000RPM and 6NM.

    If I have a worm gearbox of 60:1, this would mean my output RPM is 2000/60 = 33.33RPM and output torque 6*60 = 360NM. Is this much correct? Of course there are efficiency problems which would reduce output torque, etc, let's consider efficiency to be at 100% for now.

    In the uploaded image, I tried to figure out what output torque is necessary to lift a load that is 500kg. Is my logic correct, calculations alright? Is this a viable method to figure out the necessary output torque?

    Attached Files:

    Metaverum, Apr 13, 2022
    #2
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    noorbeast, Apr 13, 2022
    #3
  4. Yahia Emad

    Yahia Emad New Member

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    If you have a CAD model of your simulator, you could use Solidworks motion analysis to figure out the needed torques, speeds, and power of the actuators in each axis given a time based trajectory.

    Having figured out the needed speed and torque of the joint, you can start by calculating power and then choosing an actuator that can deliver this power.

    Now given this actuator-rated speed, you can select a suitable gearbox reduction ratio to result in the needed speed.
    Yahia Emad, Jun 16, 2022
    #4
  5. Gadget999

    Gadget999 Well-Known Member

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    What is the make / model of the 1200w 2000 rpm motor ?
    Gadget999, Jun 18, 2022
    #5