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i want to drive a small stepper motor, let's say nema 17 ( which is usually below 10 W ) with a big driver circuit that can run motors above 20 W.Can i use that driver and maintaining for a long period ( let's say 2-3 h ) underload ? My logic tells me that it should not be used for large stepper motor, that that driver couldnt deliver such a current and for small power it's ok, but anyway i want to be sure,

Thanks:)

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Yes, that is fine. Compare it to a big guy pushing a small wheel barrow :-)

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  • \$\begingroup\$ The big sumo wrestler may have trouble with a toddlers wheelbarrow, he might just be too big to reach down to the handles. In the same way the current limiting of a very much too large driver with too high a voltage may cause more power to be dissipated than a small motor can handle if the current limit cannot be set low enough. The answer is more case dependant and there is not enough information to be sure. \$\endgroup\$ – KalleMP Jan 27 '18 at 8:51

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