Stepper motor does not turn

Other Hardware Motors, Mechanics, Power and CNC
11

slider101:
Hello,

i have a NEMA 17 Stepper Motor with 12V 0.4A, a A4988 Driver and an Arduino Nano.
For the motor I use a 12V 2A power supply.
All cables are connected correctly but the motor does not turn.

Sometimes it makes some steps but then it jumps back and sometimes the motor does nothing.

The poti on the A4988 is at 0.4V *2 = 0.8A for the motor.

Is there something wrong with the PSU or with the driver?

Thanks for your help :slight_smile:

You problem is you are trying to drive a high impedance stepper constant-current.

To do that you need substantially more voltage - 24V for instance.

Alternatively set the A4988 for less current (say 0.25A), and put up with lower torque.

30 ohms is a high impedance motor, low impedance ones are usually in the range 0.4 to 3 ohms
and are designed to be high performance from constant current drivers.

High impedance steppers will give low speed only