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Home Product Categories Motors ROB-10847
Stepper Motor - 125 oz.in (200 steps/rev)
sku: ROB-10847
Description: These steppers are a great way to get things moving, especially when positioning and repeatability is a concern.
Note: This is a uni-polar stepper, meaning that if you are going to drive it with a bipolar stepper driver, you can ignore the yellow and white leads and drive it using the remaining four.
Features:
- Step Angle (degrees) : 1.8
- 4-Phase
- Rated Voltage: 3V
- Rated Current: 2A/Phase
- 1/4" Diameter Drive Shaft
- Holding Torque: 90N.cm
- NEMA 23 form factor
Documents:
Pricing
images are 
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Comments 21 comments
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 kgcm on the new ones.
torque is measured a lot of different ways. use google to search for conversions. you can go between lb.ft, oz.in, kg.cm, N.m, etc.
here’s a good site for that.
1m = 100cm
1N = 0.102 kg (http://www.comprsci.howard.edu/PhysSciConvFac.htm)
so 90 N.cm =
90 N.cm x 1m/(100cm) x 0.102 kg/N The cm-units cancel, the N-units cancel, leaving .…
= 90 / 100 x 0.102 = 0.0918 kg.m
http://www.numberfactory.com/nf_torque.html gives the answer as 91774.44 kg.m
use numberfactory at your risk. Check this with any mechanical engineer you know; jeez – even check it with any other unit-conversion site.
Small surprise NASA lost a mars explorer because they didn’t know how to convert between units. http://articles.cnn.com/1999-09-30/tech/9909_30_mars.metric_1_mars-orbiter-climate-orbiter-spacecraft-team?_s=PM:TECH
“ edit ” Ooops , I posted the same site as RobertC did . didn’t see the link there at first . Good site by the way .
These are really nice, but what would really put them over the top for me would be steppers with a rear shaft as well- that way we could add encoders, handwheels or similar.
Does anybody have any idea if this motor has enough torque to move something like this: Cereal Dispenser
Looking to build an automatic cat feeder
Yeah, it’s pretty powerful. and of course you could gear it as well.
I just built an automatic cat feeder with this motor (http://www.sparkfun.com/products/9238) running at 24VDC, works like a charm.
nice! Do you have any photos? What did you use to dispense the cat food?
Would running this at 5 volts damage it? (Using the easy stepper)
Thanks,
Grant
No. You probably want to run it at 3-4 times the rated voltage. Seems counter intuitive I know but thats common. To achieve high step rates, the motor supply is typically much higher than would be permissible without active current limiting. For instance, a typical stepper motor might have a maximum current rating of 1 A with a 5Ω coil resistance, which would indicate a maximum motor supply of 5 V. Using such a motor with 12 V would allow higher step rates, but the current must actively be limited to under 1 A to prevent damage to the motor.
This is a 3 volts motor. EasyDriver supplies 7 to 30 volts, BigEasyDriver supplies 8 to 35 volts, SN754410 and L293D 4.5v to 36v, L298N 4.5v to 46v.-
What can I use to drive this motor?? (please don’t say 2 x 1,5 batteries)
[I have lots of other (even bigger) beautifull stepper motors rated at weird low voltajes like this (2.63v, 5.2v, 2.93v, and so on) and high amps.. a trouble nightmare.–]
Hi
If you plug the motor directly into the rated voltage it will draw the rated current.
Normally it is recommended to run them at 5-20 times the rated voltage and use a chopping stepper motor driver, like the easy and bigeasy drivers or a L297/L298 combo, to control the current.
If you hook it up to an L298 at 4.5V but don’t control the current you will draw more than the rated current and overheat the motor or L298.
If steppers are run at higher than rated current or higher than about 20x rated voltage they can overheat and start to de-magnetise and lose torque.
Also note that at rated current you can easily get a 60 or 80 deg (Kelvin) rise above ambient on motors like this, which is pretty normal.
Anyone have any idea what the fastest RPM achievable is with this motor? Thanks.
Consider replacing the photo showing the wire leads. I nearly didn’t consider this stepper for purchase because it only appeared to have 5 leads. Only when I zoomed in did I notice the blue lead partially hidden behind the black one.
I’m new to the world of DC motors, I’m just curious, how would one attach a gear to this?
The end result is a product that can open / shut an umbrella via a rotating hex nut. I figured a double gear in between, attaching it to the umbrella is easy enough, but I’m not sure about the gear attached to the motor.
If I’m coming at this the wrong way, feel free to tell me that too.
I found all my gearing needs met at McMaster-Carr. This motor uses a ¼" drive shaft, and they have plenty of gears that will fit that out of the box. Some of your other gears might need to be machined at your local shop, but not if you’re lucky. http://www.mcmaster.com/
EDIT: Remember, if you get a “plain-bore” gear, it won’t have a “set screw” which is required to hold on to any bar. You probably want one with a set screw pre-tapped, which you tighten with an allan wrench.
Hello,
I am new to the Sparkfun site and this is my first post. I ended up buying 2 of these motors for a project that requires the control of 2 linear actuators like a 2 axis CNC project.
I realized that running the 2 motors hooked up exactly the same way resulted in one motor drawing nearly 3 times the amount of current than the other and vibrates much more. They perform the same operation (code) and with the same BigEasyDriver with the potentiometer in the same position. Does anyone know why they could be different?
I almost suspect that the wires on one of the stepper motors are different than what the datasheet specifics. I am only using the black, green, red, and blue wires. The yellow and white wires are unused.
Thank You, Andrew
PS Great prices and service Sparkfun, from the University of Colorado Boulder
Maybe it is not the wires, as I checked the coil/phase resistance and they are all within spec so not likely the wires, maybe I will just have to use different settings on the potentiometers of the driver boards.
I heard you can make these go faster by turning off micro-stepping. What is meant by that?
Hi, I bought this motor and i have an A4988 motor driver from pololu: http://www.pololu.com/catalog/product/1182
This motor states 2A/Phase and the driver states 2A / coil. I assume this means the same but has anybody tested this motor with A4988 motor driver without burning the driver up. Just so that i know.
-Ptr