I searched the topics available and my question seems to fall outside the topics listed. This is a fairly general question. Without denigrating any particular models,
what is your choice for a reliable NEMA 11 stepper motor?
Kirk
I have never seen a parameter and value for reliability with any motor, let alone a stepper motor. Why do you ask?
Maybe the OP is asking about MTBF? Can't remember that parameter for that stuff. Life exspectancy?.....
The one that does the job, whatever that might be.
What about this one? You are asking about motors and this section has motors in the title.
You do know that NEMA 11 is just the size of the frame size, it is nothing to do with the motor rating, driving voltage or how it needs to be driven (unipolar or bipolar)?
I have had some problems with inconsistent performance with NEMA 11 stepper motors. Using the exact same program and circuitry some won't rotate and some rotate clockwise and others counterclockwise. I suspect that when I am ordering a package of 5 from, for example, Amazon; I am getting the low end of the Quality Assurance pool' There is that old expression "You get what you pay for!". Thanks. Kirk Rensmeyer
True, but frame size is proportional to weight and I was looking for a small light weight motor. To rephrase the question:If you were doing a project that required a small motor; which model would you be likely to choose? Thanks. Kirk Rensmeyer
That has zero to do with reliability Mostly done by not having the current properly set on the controller board or insufficient power, voltage and current to the controller so it can do it's job.
Do you try to move the motor to high speed without acceleration? Do you try to change directions without stopping the motor, first?
I have used low speed settings (20-50); but you might have a point on stopping the motor before changing directions. Do you mean inserting a delay command? Thanks. Kirk
You can try various delay times, but that is a clear symptom of too low voltage powering the motor and incorrectly setting the current. If you are turning the motor with full steps, it will stop immediately when you stop sending pulses to the controller.
I have a stepper motor from a commercial test set. The motor is marked 4.2 volts, but the product ran at 42 volts with a 42 volt, 2 amp power supply.
What are you using for motor power and how did you set the current limit?
Thanks Paul,
I have a 28BYJ-48 stepper , ULN2003 Driver . The stepper motor is rated at 5v. I am powering it with an adapter rated at 5 v and 1.5A. I had measured the current draw at 300ma but I didn't set any current limit other than the designed adapter current limit of 1.5A.
Your original thread concerns using a NEMA 11 stepper motor. Now you are asking about a toy stepper. Have you looked at any of the hundred threads on the forum relating to your actual stepper motor problem?
Yes I have, not enough apparently. I was under the impression that a 28BYJ was a NEMA 11 in frame size.Your reference to a toy stepper goes back to my original question. Perhaps you could give me an example of a real stepper motor? Thanks. Kirk
My Google works quite well. Is yours broken?
NEMA 11 specifies a certain size of motor and the mounting hole dimensions.
See this chart. Stepper Motor NEMA Sizes
Pololu carries a good line of stepper motors of different sizes.
Pololu also carries stepper drivers for their motors.
I am not involved with Pololu. Just a customer. I like them because I get a product that I can trust. There are instructional pages for each of their products so you are not left with searching for information.
Thanks, I will check out Polulu. Have a good week. Kirk
In my experience, it isn't helpful to speak about "brands" of stepper motors since there seems to be a number of manufacturers of essentially generic products that reach the consumer through many selling channels. I have bought from Pololu, RS, Stepper Online, a machine tool supplier, and one Chinese seller via eBay. The only poor quality one came from the last and I had many problems getting redress. The problem was poor quality control that resulted in small pieces of magnetic swarf remaining in the motor.
So my advice is to buy from a good supplier, preferably in your country, who can provide a warranty, wherever they get their supplies from. It may cost a bit more but you should have fewer problems.
Also unless your requirement is very basic, forget about using those toy steppers and the ULN type drivers. These are unipolar steppers with poor resolution. Modern NEMA type bipolar steppers will have 200 steps/rev, be microstep capable, and give better torque. Modern drivers such as sold by Pololu are more efficient and support microstepping. I have used A4988, DRV8825 and DRV8834, all work well.
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