Large nema 17 motor
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I have a large nema 17 motor that have 6.5Ohm 1A rated 16mH specs. Do you think I can drive it with duet 6hc at 24V?
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@kuon Yes, and a Mini 5+ could also drive a 1A motor. However, the phase resistance and inductance is high. For guidance, see https://docs.duet3d.com/User_manual/Connecting_hardware/Motors_choosing#inductance
The inductance of the motor affects how fast the stepper motor driver can drive the motor before the torque drops off. If we temporarily ignore the back emf due to rotation (see later) and the rated motor voltage is much less than the driver supply voltage, then the maximum revs/second before torque drops off is:
revs_per_second = (2 * supply_voltage)/(steps_per_rev * pi * inductance * current)
You can use this calculator to calculate back EMF: https://www.reprapfirmware.org/emf.html
Ian
