I got two of these:

Frame size 42 x 42mm - NEMA 17
1.8 degree step angle
Length 47mm
Holding torque 44 N.cm (4.4kg.cm, 62oz.in)
Voltage 2.8V
Current/Phase 1.68A
Resistance/Phase 1.65ohm
Inductance/Phase 2.8mH
Inertia 68g.cm
Bipolar, 4-wire

I'm using a micro controller board. I've been looking on different ways to drive the motors. For example this one: Big Easy Driver. But most driver boards I looked at has a limit of around 1.4A before they get overheated. Is it ok to drive these motors at 1.4A? Or should I find any other Driver/board/chip/controller?

I'm open to any suggestions of driver/setup to drive these motors via usb communication...

Thanks :)

  • \$\begingroup\$ Connecting a 1.68A motor to a 1.4A driver will try to draw 1.68A from the driver. The driver will overheat. You could add some series resistance to reduce the current, but that would make the motors weaker and may not work properly. There are plenty of higher power drivers out there - don't look for toy (i.e., Arduino) ones since they are designed for toy motors. Look for proper ones, maybe with external FETs. \$\endgroup\$
    – Majenko
    Commented Dec 12, 2014 at 12:24
  • \$\begingroup\$ Ok, thanks for making that clear. I need to control it via usb though. You got any suggestions? \$\endgroup\$
    – galengodis
    Commented Dec 12, 2014 at 12:39
  • 3
    \$\begingroup\$ This is a arduino usage question, not about electronics. We are not the arduino help desk. \$\endgroup\$ Commented Dec 12, 2014 at 14:27
  • 1
    \$\begingroup\$ It's not only about arduino, it's also about current and stepper motors. \$\endgroup\$
    – galengodis
    Commented Dec 12, 2014 at 14:59
  • \$\begingroup\$ @Majenko A chopper drive such as the Big Easy Driver is more like a dual current source where the maximum phase currents are determined by the current-adjust, not the current rating of the motor. It is perfectly acceptable to run a 1.68A motor at a reduced current so long as there is enough torque for the application. The reduced current will allow both motor and drive to run cooler. \$\endgroup\$
    – Tut
    Commented Dec 12, 2014 at 17:29

1 Answer 1


I had the exact same motors for an Arduino Uno project. For maximum torque I used this (TB6560 3A Single-axis Stepper Motor Driver Controller Board). You can buy it on ebay cheaper.

  • \$\begingroup\$ Thanks! Do I have to set the max current per motor somewhere on the board? So I don't give too much current... \$\endgroup\$
    – galengodis
    Commented Dec 12, 2014 at 15:03

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