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Description:  These steppers are a great way to get things moving, especially when positioning and repeatability is a concern.

This is a Bipolar motor.

Features:

  • Step Angle (degrees) : 0.9
  • 2-Phase
  • Rated Voltage: 3V
  • Rated Current: 1.7A/Phase
  • 5mm Diameter Drive Shaft
  • Holding Torque: 48N.cm
  • NEMA 17 form factor

Documents:

Comments 76 comments

  • There isn’t any chance of an actobotics mount for any of these in the near future, is there? I was just thrilled a couple of days ago when I noticed the Actobotics parts show up on Sparkfun. I’ve been planning a project for months, but I’ve already bought a servocity gearmotor and the Actobotics mount for it, and it won’t work for my application. I really think a stepper would be best. I’m going to try to laser-cut something out of acrylic, but it wouldn’t be as good as an aluminum part.

    • I was also excited about the actobotics product line but then i couldn’t seem to find any stepper motor mounts. Did you ever find a mount of motor that works with actobotics?

    • Actobotics now has NEMA mounts for these.

    • I mounted two of these servos to Actobotics components. I made an acrylic adapter for one (saw and drill press, no laser cutter) that I mounted to a channel piece and just elongated the mounting holes on a dual flat bracket to mount the other. Both techniques worked well. The former is the more elegant solution. The latter is considerably easier. Spacers are required between the motor or adapter and the Actobotics piece. The biggest challenge is getting everything aligned. I use a ¼-20 screw plate as a drilling template for making Actobotics compatible components. It is steel, not aluminum so it holds up well. And once you drill two holes, you can physically screw it in to your piece to hold alignment.

  • I don’t know if i should be posting this here or on the Big Easy Driver Page, but i’m hoping somebody will be able to provide me with some insight. I have been able to get it running using the example provided on Brian’s website. The issue i am having, is that the motor will only run smoothly when the current is being limited much lower than what the motor is capable of. When i adjust the current limit higher the motor will keep losing power entirely (i.e. the shaft can be freely spun until it starts spinning again). Is this an issue with the supply i am running it off of? The power supply i am using is a 19V supply rated at 4.7 amps.

    • Ok, so you need to read the specfications. NO your easy driver cannot correctly provide enough current for this motor. (Just because it says 2Amps for the new version, that assumes proper thermal managment, AKA cooling). The reason it seems to turn on and off is you are overheating the easy driver. This motor must be limited to 1.7 Amps from your voltage source by the stepper driver. If you start out with 12 volts or higher, the 1.8 Ohms of the motor coil is going to result in more than 1.7 Amps. But that’s why we use switching stepper driver that PWMs the output of the H-bridge and limits the current. The thing to keep in mind too is that it’s an inductor and thus that 1.8 Ohms is not the complete picture. When the motor moves, we turn off and on the coils and that frequency too affects the complex impedance of the coil. Thus the the apparent voltage across the coil changes to result in the same current as the motor speeds up or down. This is why we want the higher source voltage, to ensure we have enough headroom to attempt to keep the same current (and thus magnetic strength which creates the torque). Again, the key here is that the stepper drive actively limits the current via PWM to the motor coil. That means the driver will kick off a fair amount of heat as the energy must go somewhere and the 1.8 Ohms of the motor isn’t going to disipate much. When you turn down the current potentiometer of the stepper driver to a level where it can survive (most say about 1 Amp or less on an easydriver) then you will get about half the rated torque at best. You really need an industrial rated driver (2 Amps or more and heatsinked) to properly run these motors at spec. Again, to be clear, while you might slap a heasink onto the easy driver and add a fan, it may not be enough to properly run this motor at 1.7 Amps in all conditions. You can turn the current down, but then you do not get the rated torque.

  • SO whats the deal, how do you power/control this thing? The big easy supplies enough current but too much voltage for this stepper motor

    • basicaly , just take care that your driver intensity specs are respected (for example easy driver is a no-go) after that , dont care about the voltage , you can run them up to X3 to X(insert random high number) volts or more , they ll easily take 24v for example

  • I have some of these in my reprap, they are great little steppers. Plenty of torque and .9 deg steps make these great for cnc applications. I’m using the Pololu A4988 stepper driver and while they were a pain to tune, once they are tuned they operate very well.

    • any clues on how to tune these on a reprap? did you just follow the step/unit formulas descriped on the reprap wiki?

      • We’ve been using these motors on our Mendelmax for a little while. We found a decent set of values that gets reasonablyt fast and accurate printing, and posted the modified Marlin firmware at https://bitbucket.org/terawattindustries/erikzalm-marlin-mendelmax-sfwantai/overview. Look for the configuration.h file.

  • Does anyone know how much this motor weighs?

  • Hi guys, I use this motor together with the Big Easy Driver and everything works quite well besides: Regardless of whether I use microstepping or not, the motor just turns at a full step. Principally microstepping is working: I have to trigger the the correct amount of steps to get it turn the desired angle and I also can hear that the motor is changing its sound when I shift it by a single step (in microstepping mode). So the driver seems to work, but the motor does not turn every microstep, but just every fullstep. E.g. in the 1/8 microstepping mode I have to trigger 8 steps until the motor moves for the first time. But then it travels the correct 0.9 degrees. The same problems seems to appear for every other microstepping value, so I need to trigger 4 steps in the ¼ mode to see it turning. In fullstep mode of course everything works as expected. Does anyone have an idea about this, or do I just don’t grasp it? Cheers, Chris

  • Someone bought over 100 of these at a clip because the inventory was well over 100 an now it’s 0.

  • which driver or interface do i need from sparkfun using ROB-10846 and arduino uno - edinson

  • tell how to interface ROB-10846 3 volts with arduino uno 5 volts which driver you recommend from spark fun do i need - thanks - edinson

  • I’m new to this whole stepper thing. Want to use this particular one to shuffle some candy pieces around. I’m using the Big Easy Driver. I’m controlling it with an Arduino (on a breadboard at 16 MHz). The pulsing routine looks like this:

    #define CLOCKWISE LOW
    #define COUNTERCLOCKWISE HIGH
    
    void stepperSteps( long n ) {
      digitalWrite( DIR_PIN, n < 0 ? COUNTERCLOCKWISE : CLOCKWISE );
      digitalWrite( ENABLE_PIN, LOW );
      n = abs( n );
      for( ; n > 0; n-- ) {
        PORTB |= _BV(PINB1); // WAY faster than digitalWrite
        delayMicroseconds( 50 );
        PORTB &= ~_BV(PINB1);
        delayMicroseconds( 50 );
      }
      digitalWrite( ENABLE_PIN, HIGH );
    }
    

    I ENAble the board, set direction, pulse using direct bit manipulation to get it as fast as possible, then unENAble the board. I tuned the current to the motor and all seems to be pretty happy.

    The BED docs say pulses should be 10 µsecs. If I do that, the motor stutters. I assume because there just isn’t enough time between edges. 50 µsecs is the sweet spot I’ve found. Upwards of 100 µsecs or longer and the motor stutters again. When the motor stutters, I try upping the current thinking maybe it needs some help holding between pulses. That just makes the motor and the BED super hot (chip gets to 150ºF, motor is barely comfortable to hold) and generally doesn’t help the motor move well at all. At 50 µsecs, the chip temperature drops to 80-ishºF.

    Anyone have a solid reason why 50 µsecs would be the sweet spot for making everything move smoothly? Just curious!

  • Could I use the EasyDriver Stepper Motor Driver for this motor? It is for a desktop CNC machine.. Thanks

    • You’d want to use the BigEasy Driver. The EasyDriver can’t provide enough current per phase for this motor.

  • Where may I purchase gear wheels and pulleys for the NEMA 17 form factor stepper motor? Strangely, I am having a difficult time locating them on the Net. Thank you.

  • I am building my own board for really simple operation. I have TI 8835 H-bridge chip with 3.3V supply. It can only drive 1.5 A per phase. Will it be able to drive this motor? Thanks!

  • I am having some trouble with this motor. I am using a Pololu DRV8825 as my driver. http://www.pololu.com/catalog/product/2132

    My motor is able to turn cleanly one direction (counter clockwise), but the other direction is not very consistent. Sometimes the motor shakes violently and it doesn’t rotate as far as it is supposed to. I have wired the motor to the driver in several different configurations, but none have solved the problem. The motor is running off of 12V and set to about 1.4A.

    If anyone had any thoughts, I would appreciate it.

    • I figured out my problem above. I’ll post it here as an fyi to others in the future. I was using a 500Hz signal to my driver for stepping when I was getting problems. I upped my frequency to 1k Hz, and it works completely fine now.

  • Would these work with https://www.sparkfun.com/products/10267?

    • the link you posted only puts out 750ma. The stepper needs 1.7a. Better option would be https://www.sparkfun.com/products/10735

  • Will these stepper work with these boards:

    http://hackspark.fr/media/catalog/product/cache/2/image/ff5cb8349b65cb691ec1bdf26c229aff/s/t/stepmotordiver2_1.jpg

  • Has anyone had any luck running these with the Snootlab Rotoshield? I’m having issues with them changing direction sporadically when commanded to run forward for X steps.

  • unipolar/bipolar? I see 4 wires in pic…

  • bi-polar or unipolar?

  • Is this motor bi-polar or uni-polar?

  • Ditto - I’m sweating on these also.

  • Anyone knows when they will be in stock again ?

  • Has anyone run these at 24v? I’m putting these in a mendelmax and I’ll have a nice beefy 24v switching supply for the heated bed, as well as a 12v switching for everything else.

    I’m using a sanguinololu board with 4 A4988 drivers. I’ll start them off at 12v, but if anyone has run them successfully at 24 I’d like to know.

    • I’ve successfully used these with a 24v power supply, driven by the a4988 pololu drivers without problems. I’ve had to tune the a4988’s, but other than that they seem to work fine.

  • Hi, what will possibly be the best bridge for that one ? L298 ?? any other suggestion?

  • Figures, as soon as I’m ready to order 5 of them, you sell out…

  • Any word on when these will be available again?

  • So what is correct for this motor? The datasheet on the spark fun site or the data from the manufacturers website? About 10oz/in difference between the two!

  • Has anyone got max RPM figures?

    • I’m working on a dsPIC based step motor driver and I’m actually running one of that at more or less 180RPM with microstepping (8microsteps/step) Here is a short live demo http://www.youtube.com/watch?v=G3GAjPCV5qA Thanks!

    • with my ARDUMOTO, it freezes at about 88 RPM

  • I am looking into building a small CNC Mill and I was wondering if 58 oz-in would be powerful enough. I like the resolution (400 steps/rev) on these. I would rather use these than the 125 oz-in ones if I can because of the resolution. Thanks for any help or advice.

  • I checked the Datasheet and the website (http://www.wantmotor.com/ProductsView.asp?id=157&pid=75&sid=80) and I can’t seem to find what the mounting holes are tapped for? I’m guessing an M3 or M4 but not sure on the thread pitch. Can anyone tell me so I can find the right bolts/screws.

    • Doh! Looking at the Datasheet again I see that the holes are labeled 4-M3 and it looks like 4.5mm deep. Now I just need to know if it’s 3-48 or 3-56 or is it Metric M3-.50??

      • All Nema 17 motors are going to use M3-.50 metric screws since it’s a metric size motor with a 5mm shaft. Basically when they said 4 they meant 4 each, M3 metric screws and the only popular thread in M3 is 0.50. Valid question.

        • Thanks for the reply. I knew the 4 meant 4 holes but wasn’t sure about the M3 variant. I was leaning towards the metric M3 0.50 since all the measurements were in metric but wasn’t sure if there was more than one metric type like there is the SAE 3-48 and 3-56.

  • what wire gauge are the wires?

    Never mind just read a link with data sheet and its AWG26

  • Any idea when they will be back in stock?

  • just buy a 1000 of these, they go away so fast…

  • Another question for the easy driver: this motor is rated for 3V while the easy driver runs from 7 to 30V is that an issue?

    • stepper motor voltage is strange. in short, you can run a stepper at a MUCH higher voltage than rater. do a little search online about stepper motor voltage ratings and you’ll see that you’ll actually want to run them higher.

  • This motor can handle with easy driver? or its best a big easy driver consider that

    the motor Rated Current: 1.7A/Phase

    easy driver has Adjustable current control from 150mA/phase to 750mA/phase

    big easy driver has 2A/Phase Max

    I need precission and velocity, and less torque

  • The title states 58 oz-in holding torque. But the description and datasheet state 48 N-cm, using the link provided by RobertC, converting 48 N-cm = 68 oz-in. Is the title a typo?

    • i’d like to know this as well. Which one is correct?

      • Does no-one read datasheets anymore? The holding torque is listed as 48 N.cm (i.e. 68 oz.in) right there on the first (and only) page of the linked datasheet.

        • This makes no sense. The datasheet posted for the product is clearly incomplete. Meanwhile the one on the manufaturer’s site appears more complete but conflicts with the specs stated here. People should continue to ask for clarification. SF help?

        • However the website linked in the datasheet shows 4200g-cm, which comes out around the 58 oz-in rating in the title.

          http://www.wantmotor.com/ProductsView.asp?id=157&pid=80

  • Is the holding torque 58oz.in or 58 N.cm?

  • What about weight information?
    you know, shipping concern :)

  • Neet. How will this handle on the EasyDriver? Considdering the Easy Driver has a max of 750 mA and this being 1.7A

  • Could you please recalculate the estimated holding torque for the new stepper motors listed to give out the same data as the first one you had in stock for some time.
    the old one reads Holding Torque : 2.3kgcm
    Whats The kg
    cm on the new ones.

  • I calculate a 1.6" face, would this be considered NEMA 17 ?


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