Hi family , how are you , i have a question about stepper motor driver , i want buy a nema 17 (17HS4401)
and i don't know which driver work with him fine , with any problem Or the burning of the driver.
i want a cheap one work with this motor and with arduino .
I would recommend the DRV8825 driver. They are also available on ebay (much cheaper). Be sure to read about the requirement to set the driver's Vref for your motor and the need for cooling if the driver outputs more than 1.5A per phase.
As @groundfungus said the DRV8825 may be struggling with a 1.7 amp motor. A driver using the TB6560 chip can handle more current.
Robin2:
As @groundfungus said the DRV8825 may be struggling with a 1.7 amp motor. A driver using the TB6560 chip can handle more current.
Thanks for you reply , for my budget i think 5*TB6560 (24$) it's very expensive , Is there an alternative to that driver
I am running 3 steppers at 1.8A each with DRV8825 drivers with no problems in nearly a year. The drivers do have heat sinks (supplied with the drivers) and cooled by a small fan. The Pololu site says up to 2.2A with proper cooloing.
OK, in my project the motors will be run just for 1 minute every 10 minutes , so it's not necessary to put a cooling fan ??
I would say yes, but I can only go by my results with my setup. If you don't have to run the motors at full rated current,you can set the Vref so that the current is limited to 1.5A. You MUST set the Vref as described in the Pololu page that I linked, anyway, as there is no guarantee that the drivers are set properly from the factory.
So it's better to put a colling fan for the five DRV8825 ??
and choosing 1V in Vref to get 2A in current limit .
The motors that you show in the original post have a rated current of 1.7A. I would not run them over their rated current. Like I said in an earlier post, if you set them to run at 1.5A, no fan or heat sink is necessary. Even then, fan cooling and/or a heatsink can't hurt.
So , this DRV8825 driver will work with my motors 1.7A or not , because i haven't any experience about the stepper motors 
aymannox:
So , this DRV8825 driver will work with my motors 1.7A or not
What everyone is saying is that a DRV8825 is getting close to its limit with that motor and you will need a heat sink and cooling fan.
If you have not already bought the motors why not choose a different one with a lower max current?
...R
Robin2:
If you have not already bought the motors why not choose a different one with a lower max current?...R
Because they tell me the motor who have a high max current is the best , and the motor that have a low max current can skip some step
and also this motor have 1.5 ohm in the phase resistance so is good but the other have more than 10ohm
aymannox:
and also this motor have 1.5 ohm in the phase resistance so is good but the other have more than 10ohm
You don't need to jump straight from 1.5 to 10 ohms. There are hundreds of different Nema17 motors on the market.
What you need is to find a motor with sufficient torque. What do you want to use the motors for?
The lower coil resistance is better if you need higher step speeds.
My advice is to get a more powerful driver than a DRV8825 if you want to use that motor. Or, get some DRV8825 drivers with heat sinks and a cooling fan and be prepared to replace them if they are not suitable.
...R
I want a motors to use them in many project in a cnc machine , in an extruder and in a rubik cube solver project , and the necessary project is the extruder . What are the specifications of these motors that i can run it with DRV8825 driver ??
aymannox:
What are the specifications of these motors that i can run it with DRV8825 driver ??
As far as I can see you have already been given all the info you need in the various Replies you have already received. Have you studied the links I posted in Reply #2?
The correct way to select a motor is to identify the torque and speed required. Starting with the driver is like starting at the back end of a horse. If you want to use the motor for a number of applications then you need to identify the torque and speed required for each application and then choose a suitable motor that will work in the most demanding case.
Many motor manufacturers publish graphs showing how torque varies with speed. Generally speaking the available torque reduces as the speed increases.
...R
Robin2:
If you want to use the motor for a number of applications then you need to identify the torque and speed required for each application and then choose a suitable motor that will work in the most demanding case.Many motor manufacturers publish graphs showing how torque varies with speed. Generally speaking the available torque reduces as the speed increases.
...R
That the probelm i don't know to choose the correct motor , i don't know how many speed i need and torque , i please if you know to help to do that , because is the first time that i work by a stepper motor
aymannox:
i don't know how many speed i need and torque , i please if you know to help to do that
How can I possibly know that? You are the person that has the projects to do. I can't do any measurements on your equipment.
In the link I posted in Reply #2 there is a suggestion for a simple means to measure torque. You should be able to estimate the speed requirement by knowing what you want to do.
...R
what is the minimum torque for CNC
aymannox:
what is the minimum torque for CNC
How long is a piece of string?
Jeez, you have not even said what you are doing with CNC.
...R
Sir ,I think that i will build the CNC plotter pcb just by 28byj-48 stepper motor
and the nema motor for the extruder in auto feeder project
and also in the Rubik solver Project
So what is the best and cheap stepper motor for these two projects , Sir?
