Can any one advise which stepper motor driver to use for controlling 3 NEMA 17 stepper motors?
I used a L298N but it gets too hot after a while.
Phase Number: 2
- Step Angle: 1.8°±5%
- Rated Voltage: 2.8V
- Holding Torque: ≧5 Kg-cm(70 Oz-in)
- Rated Current: 2.0A
- Resistance(20℃): 1.4±10%?/phase
- Max. Slewing PPS: 2500 PPS
- HI-POT: AC 600V/1mA/1S
- Rotor Inertia: 68g.cm2
- Inductance: 3.0±20%mH
- Detent Torque: 2.0Kg-cm
- Insulation Resistance: ≧100M?(DC 500V)
- Leads: 4
What are the specifications of the steppers? Can you post a data sheet?
Pololu carries a wide selection of stepper drivers.
These links may help. However we really need to see the datasheet for your motors.
Stepper Motor Basics
Simple Stepper Code
I'd also suggest you use a stepper driver - one that's rated for the current of your steppers.
Or if you insist on using an H-bridge for his, at least use a halfway modern one instead of the old L298N, and make sure you have a means of limiting the current in the motor coils.
Phase Number: 2
That are the two main specifications. The first tells it's a regular bipolar motor, the second how much current you want to operate it at.
The pololu link above shows a good number of stepper controllers that can handle this current - most will need a heatsink. You can of course also run your stepper at lower than rated current, but you will be losing torque.
I suggest you get a driver that can handle at least 3 amps to give yourself some headroom. It is not a good idea to run electronic equipment at its limit.