The driver i am using is a a4988 Polulu with 2Amps maximum current. The Vref is set to 0.66 so depending on the Rsense ( 0.05 ) the Imax is set to 1.65.
I have made the wiring, uploaded the code with a delay of 0.1 seconds but the motor won't move. I use a power supply set to 20V.
Since this is very hard to debug. Is this driver compatible with the motor? Or the max current of the driver is too low to move the motor?
You really need a much more powerful driver for that 2.8 amp motor. If it was my project I would be looking for a driver that can deliver at least 4 amps. It is never a good idea to operate electronic equipment near its limit.
Set the current limit for the A4988 at 1 amp and see what happens. It's very unlikely that an A4988 can deliver 1.65 amps without a heat sink and a cooling fan.
"driver that can deliver at least 4 amps". I can feed my motor more than the rated current? Or are you saying that i just need a more powerfull driver overall and set it's limit to less than 2.8? Also, a TB6600 would do the job?
I am experimenting with a stepper motor NEMA23 with the following specifications:
Rated current: 2.8A/phase
The driver i am using is a a4988 Polulu with 2Amps maximum current.
The A4988 cannot handle 2A or anything like that unless you liquid-cool it I'm afraid. 1A is about it
for a little module in free air.
The DRV8825 might get you to 1.5A with good cooling. Power dissipation in the driver scales as
current-squared, so 2.8A is way beyond possible.
For 2.8A you need a proper MOSFET driver like a GeckoDrive. Find a unit rated at at least 4A
if you are wanting to drive a 2.8A motor, as running things at the limit is often a cause of unnecessary
grief.