Help with tuning Stepper motor

[PSmithDelab]

hi everyone.

i was looking that the manufacturer of the Nema 34 rates the min Voltage as 3.1V and max continuous current as 7A.
what would be the max current i should apply if i'm connecting the Nema 34 with 48V? and how much Voltage does the Nema 34 can hold?

Thanks!.

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[ger21]

If it's rated at 7 amps, then supply it with up to 7 amps. Torque will be proportional to the current supplied.
Most Nema 34's can easily be run at 72V, and probably more.

[themightyx]

If it's rated at 7 amps, then supply it with up to 7 amps. Torque will be proportional to the current supplied.
Most Nema 34's can easily be run at 72V, and probably more.

So it should be run at its rated current regardless of supply voltage?

[TDHofstetter]

It should. Monitor its current and observe the voltage at the motor. As long as you limit the current, the voltage at the motor will be self-limiting to whatever voltage can push your current through the motor's resistance / impedance.

There are always losses in wiring, in connectors, in your drivers... and limiting current lets you ignore those losses.

Note that you don't have to run at the steppers' maximum rated current; very often there's no need to do that, and it can be rough on the motors due to heat generation. Use only as much current as you actually need to do everything you want to do, and keep an eye on your steppers' temperature.