Re: Basics for me that has been playing with steppers and Trinamic

Here an extract from an article published:

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Chopping the drive voltage provides better torque-speed characteristics
Stepper motor performance
Providing higher voltage to the motor windings effectively pushes the torque-speed curve “out,” resulting in higher torque production at higher speeds.
Image credit: PBC Linear
Chopper drives supply a high level of voltage (often up to eight times the nominal voltage) to the motor, which, according to Ohm’s law (current = voltage ÷ resistance), results in higher current through the windings.

stepper motor performance

When the drive senses that the current has reached a predetermined value, the voltage supply is switched off, or “chopped.” And when the current falls below a certain level, the high voltage supply is switched on again.

This method of voltage chopping also improves the rate of current rise (dI/dt). So by increasing the driving voltage, the windings can reach a higher current level — even when the pulse rate is high, meaning more torque is produced at a higher speed.

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Here where the extract comes from!