I apologize if the question is silly as this is my first project involving stepper motors and I'm confused about power supply specifications.

So I'm working on a project involving:

  1. 3 NEMA 17 Stepper motors with 4.2 kg-cm torque
  2. 3 A4988 drivers

Now the motor is rated for 3.2 V 1.2 Amps/phase. So, at 3.2 V the motors require 3.6 A of current in total which means a wattage of about 11.5 W.

So can I use any power supply which can deliver sufficient wattage or should the power supply be capable of delivering 3 Amps regardless of its voltage?

Is an 18V 2A supply sufficient or do I require a 12V 4A power supply?

  • 1
    \$\begingroup\$ @Joshi, Ah, let me see. (1) Usually the motor current rating is important. So for your 1.2A per phase motor, 1.2A x 2 = 2.4A ~= 4A should be good enough. (2) For A4899, you can use 8 ~ 35V to drive the motor. So, I don't usually consider power! :) See my answer below for motor details. Have a great project. Cheers. \$\endgroup\$ – tlfong01 May 1 at 5:13


Which PSU to use for microstepping NEMA17 steppers at 3.2V, 1.2A per phase?


(1) Using A4899 and DM542 microsteppers, you can set max phase current, say 1.2A, for your NEMA17.

(2) So you can use high volt PSU as high as 36V, 2A, for your NEMA17 at 3.2V 1.2A /phase.


(1) Driving NEMA steppers using microstepper DM542 ... - EESE 2021apr22

(2) Fake microstepping in A4899 ... stepper-drivers? - EESE 2021apr14

(3) What could be the reasons for a stepper motor stuttering with an A4988 driver? - EESE 2021apr05 [Locked]


Appendix A - A4899 driving NMEA stepper schematic

a4899 nema


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