Thread: load sharing
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Old August 13th, 2012, 06:47 AM   #7
kekrahulik
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kekrahulik is offline
 
Join Date: Apr 2009
Location: Lancaster,pa
Posts: 271
Jeff,

I haven't done an application like this, but I wonder if you would see stability issues with three drives trying to follow one drive's torque f/b - would it settle or oscillate?

Also, be careful running drives in sensorless vector mode for torque control. It was explained to me by an AB guy that sensorless vector mode does not provide true torque control, rather it is current control. I can say from experience that the two are not the same - especially at zero and near zero speed.

I think the idea of running all in volts/hertz may be worth considering.

Of course on some of the higher end drives, you can effectively do an electronic lineshaft, but for dumb conveyors it seems overkill to not use a simple drive.
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