I am controlling the motor driver with an Arduino and am powering the motor driver with a variable DC power supply.
In attempt to supply more voltage to the motor, I have now removed the 5V_EN jumper and am inputting 5 volts from the Arduino to power to driver circuit.
I have set the variable power supply to 18 volts. Before turning on the motor, the variable power supply is outputting (based on the display) 18 volts and 0.01 amps. When turning on the motor, the power supply is outputting around 6 volts and 2 amps. After turning the motor on once, the power supply continues to output 6 volts and 2 amps even when the motor is off.
How can I increase the voltage to increase the torque of the stepper motor?
If this is not possible, what motor controller drivers (compatible with Arduino) would be appropriate for this task?