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    weknow's Avatar
    weknow Posts: 1, Reputation: 1
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    #1

    Jul 11, 2013, 12:12 AM
    Torque to turn a solar panel
    Hi,

    I have a solar panel weighing 20 kgs mounted to a frame which resembles a see-saw. The panel is mounted to frame using ball bearings, so friction loss is minimum. A gear is connected to centre of frame which can turn the panel. I am using a stepper motor. What is the torque required?

    Panel weight : 20kgs
    Panel length : 1.5 meter
    Gear ratio 28:1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jul 11, 2013, 05:41 AM
    Is the center of gravity of the panel perfectly balanced on the bearings - in other words does it balance in all orientatins all by itself? Also, to determine the torque you must estimate the friction force of the bearings - you say it's "minimal" but what we need a value. How hard do you have to lift or push in order to rotate the panel at the desired speed?
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